Fix linking recipe for wsvpn

Only the first object was being added

.gitignore

@@ -0,0 +1,4 @@
+img2cpi
+img2cpi.o
+wsvpn
+wsvpn.o

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "dependencies/stb"]
+	path = dependencies/stb
+	url = https://github.com/nothings/stb
+[submodule "dependencies/mongoose"]
+	path = dependencies/mongoose
+	url = https://github.com/cesanta/mongoose

Makefile

@@ -0,0 +1,9 @@
+CPPFLAGS += -Idependencies -Idependencies/mongoose
+LDLIBS += -lm
+
+all: img2cpi wsvpn
+
+wsvpn: wsvpn.o dependencies/mongoose/mongoose.o
+	$(CC) $(LDFLAGS) $^ $(LOADLIBES) $(LDLIBS) -o "$@"
+
+.PHONY: all

anim-web.lua

@@ -0,0 +1,41 @@
+local ccpi = require("ccpi")
+local args = { ... }
+
+local terminal = term.current()
+if args[1] == "-m" then
+    table.remove(args, 1)
+    print("Using monitor: " .. args[1])
+    terminal = peripheral.wrap(table.remove(args, 1))
+end
+
+local frames = {}
+local n_frames = tonumber(args[1])
+local base_path = args[2]
+
+for i = 1, n_frames do
+  local url = string.format(base_path, i)
+  print("GET " .. url)
+  local req, err = http.get(url, nil, true)
+  if not req then
+    printError(err)
+    return
+  end
+  local img, err = ccpi.parse(req)
+  if not img then
+    printError(err)
+    return
+  else
+    print(img.w .. "x" .. img.h)
+  end
+  table.insert(frames, img)
+  req.close()
+end
+
+local frame_no = 0
+while true do
+  local frame = frames[(frame_no % #frames) + 1]
+  ccpi.draw(frame, 1, 1, terminal)
+  os.sleep(0.0)
+  frame_no = frame_no + 1
+end
+

augment/files.json

@@ -2,7 +2,11 @@
     "repository": "https://git.salushnes.solutions/hkc/cc-stuff/raw/branch/master/augment",
     "files": [
         {
-            "path": "startup",
+            "path": "wsvpn.lua",
+            "src": "wsvpn.lua"
+        },
+        {
+            "path": "startup.lua",
             "src": "startup.lua"
         },
         {

augment/main.lua

@@ -45,7 +45,7 @@ local function safeset(func, name, old)
     if func then
         local s, res = pcall(func)
         if not s then
-            print("ERR: " .. name .. " failed: " .. res)
+            printError("ERR: " .. name .. " failed: " .. res)
         else
             return res
         end
@@ -60,10 +60,7 @@ parallel.waitForAll(function()
         local ev = { os.pullEvent("exit") }
         if ev[1] == "exit" then
             _G._running = false
-            local oldc = term.getTextColor()
-            term.setTextColor(colors.red)
-            print("Caught exit event, shutting down...")
-            term.setTextColor(oldc)
+            printError("Caught exit event, shutting down...")
             break
         end
     end

augment/modules/event.lua

@@ -1,7 +1,7 @@
 return function()
     while _G._running do
         local ev = { os.pullEvent() }
-        if ev[1] == "key" and ev[2] == keys.q then
+        if ev[1] == "key" and ev[2] == keys.f4 then
             os.queueEvent("exit")
             break
         elseif ev[1] == "timer" or ev[1] == "plethora_task" then

augment/modules/wh.lua

@@ -21,6 +21,7 @@ return function()
                 cache[id].cube.setAlpha(0x20)
                 cache[id].cube.setDepthTested(false)
                 cache[id].frame.setDepthTested(false)
+
                 cache[id].cube.setPosition(entity.x - 0.25, entity.y - 0.25, entity.z - 0.25)
                 cache[id].frame.setPosition(entity.x, entity.y, entity.z)
                 cache[id].text.setAlpha(0xFF)

augment/wsvpn.lua

@@ -0,0 +1,154 @@
+local expect = require("cc.expect")
+
+local WSModem = {
+  open = function(self, channel)
+    expect.expect(1, channel, "number")
+    expect.range(channel, 0, 65535)
+    self._request(0x4f, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel)
+      })
+  end,
+  isOpen = function(self, channel)
+    expect.expect(1, channel, "number")
+    expect.range(channel, 0, 65535)
+    return self._request(0x6f, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel)
+      })[1] ~= 0
+  end,
+  close = function(self, channel)
+    expect.expect(1, channel, "number")
+    expect.range(channel, 0, 65535)
+    self._request(0x63, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel)
+      })
+  end,
+  closeAll = function(self)
+    self._request(0x43)
+  end,
+  transmit = function(self, channel, replyChannel, data)
+    expect.expect(1, channel, "number")
+    expect.expect(2, replyChannel, "number")
+    expect.expect(3, data, "nil", "string", "number", "table")
+    expect.range(channel, 0, 65535)
+    expect.range(replyChannel, 0, 65535)
+
+    local serialized = textutils.serializeJSON(data)
+    expect.range(#serialized, 0, 65535)
+    serialized = { serialized:byte(1, 65536) }
+    self._request(0x54, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel),
+        bit.band(0xFF, bit.brshift(replyChannel, 8)),
+        bit.band(0xFF, replyChannel),
+        bit.band(0xFF, bit.brshift(#serialized, 8)),
+        bit.band(0xFF, #serialized),
+        table.unpack(serialized, 1, #serialized)
+      })
+  end,
+  isWireless = function(self) return true end,
+  run = function(self)
+    while true do
+      local data, binary = self._socket.receive()
+      if not data then return true end
+      if binary == false then return false, "Not a binary message" end
+      data = { string.byte(data, 1, #data) }
+      local opcode = table.remove(data, 1)
+      if opcode == 0x49 then -- info
+        local len, msg = self._read_u16ne(data)
+        msg = string.char(table.unpack(msg))
+        os.queueEvent("wsvpn:info", msg)
+      elseif opcode == 0x41 then -- Set address/side
+        local len = table.remove(data, 1)
+        self.side = string.char(table.unpack(data, 1, len))
+      elseif opcode == 0x45 then -- Error
+        local request_id, error_length
+        request_id, data = self._read_u16ne(data)
+        error_length, data = self._read_u16ne(data)
+        local message = string.char(table.unpack(data, 1, error_length))
+        os.queueEvent("wsvpn:response", false, request_id, message)
+      elseif opcode == 0x52 then -- Response
+        local request_id, response = self._read_u16ne(data)
+        os.queueEvent("wsvpn:response", true, request_id, response)
+      elseif opcode == 0x54 then -- Transmission
+        local channel, replyChannel, dataSize, packet
+        channel, data = self._read_u16ne(data)
+        replyChannel, data = self._read_u16ne(data)
+        dataSize, packet = self._read_u16ne(data)
+        os.queueEvent("modem_message", self.side or "wsmodem_0", channel, replyChannel, textutils.unserializeJSON(string.char(table.unpack(data, 1, dataSize))), nil)
+      else
+        return false, string.format("Invalid opcode 0x%02x", opcode)
+      end
+      os.sleep(0)
+    end
+  end,
+
+  -- low-level part
+
+  _read_u16ne = function(self, data)
+    local v = bit.blshift(table.remove(data, 1), 8)
+    v = bit.bor(v, table.remove(data, 1))
+    return v, data
+  end,
+
+  _wait_response = function(self, request_id)
+    while true do
+      local ev, status, id, data = os.pullEvent("wsvpn:response")
+      if ev == "wsvpn:response" and id == request_id then
+        return status, data
+      end
+    end
+  end,
+
+  _request = function(self, opcode, data)
+    local request_id = self._get_id()
+    self._socket.send(
+      string.char(
+        opcode,
+        bit.band(0xFF, bit.brshift(request_id, 8)),
+        bit.band(0xFF, request_id),
+        table.unpack(data or {})
+        ),
+      true
+      )
+    local status, response = self._wait_response(request_id)
+    if not status then
+      error(response)
+    end
+    return response
+  end,
+
+  _get_id = function(self)
+    self._req_id = bit.band(0xFFFF, self._req_id + 1)
+    return self._req_id
+  end,
+
+  _send_text = function(self, code, fmt, ...)
+    local msg = { fmt:format(...):byte(1, 1020) }
+    self._socket.send(
+      string.char(
+        code,
+        bit.band(0xFF, bit.brshift(#msg, 8)),
+        bit.band(0xFF, #msg),
+        table.unpack(msg, 1, #msg)
+      ),
+      true
+    )
+  end,
+
+  _init = function(self)
+    self._send_text(0x49, "Hello! I'm computer %d", os.getComputerID())
+  end,
+}
+
+return function(addr)
+  local ws = assert(http.websocket(addr))
+  local sock = setmetatable({ _socket = ws, _req_id = 0, side = "wsmodem_unknown" }, { __index = WSModem })
+  for name, method in pairs(WSModem) do
+    sock[name] = function(...) return method(sock, ...) end
+  end
+  sock._init()
+  return sock
+end

badapple-tape.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# x-run: python3 % badapple.bin ~/videos/badapple/frame*.png
+
+from sys import argv
+from PIL import Image
+
+w, h = 82, 40
+
+bits = [[1,2],[4,8],[16,0]]
+
+with open(argv[1], "wb") as fp:
+    fp.write(bytes([w, h]))
+    for i, f in enumerate(argv[2:]):
+        with Image.open(f) as im:
+            img = im.resize((w * 2, h * 3)).convert("1")
+            for y in range(h):
+                line = bytearray()
+                for x in range(w):
+                    val = 0
+                    for oy, l in enumerate(bits):
+                        for ox, bi in enumerate(l):
+                            if img.getpixel((x * 2 + ox, y * 3 + oy)):
+                                val |= bi
+                    # if img.getpixel((x * 2 + 1, y * 3 + 2)):
+                    #     val ^= 0x9f
+                    line.append(val)
+                fp.write(line)
+        print(f"wrote {i + 1} / {len(argv) - 2}")

bigterm-hello.lua

@@ -0,0 +1,99 @@
+local bigterm = require("bigterm")({
+    { p = peripheral.wrap("monitor_1"), x = 1, y = 1 },
+    { p = peripheral.wrap("monitor_2"), x = 2, y = 1 },
+    { p = peripheral.wrap("monitor_3"), x = 1, y = 2 },
+    { p = peripheral.wrap("monitor_4"), x = 2, y = 2 },
+    { p = peripheral.wrap("monitor_5"), x = 1, y = 3 },
+    { p = peripheral.wrap("monitor_6"), x = 2, y = 3 },
+}, {
+    palette = {
+        [colors.white] =     0xEFEFEF,
+        [colors.orange] =    0xEF712A,
+        [colors.magenta] =   0xCF43EA,
+        [colors.lightBlue] = 0x5643EF,
+        [colors.yellow] =    0xEFCF42,
+        [colors.lime] =      0x43FA99,
+        [colors.pink] =      0xEF7192,
+        [colors.gray] =      0x676767,
+        [colors.lightGray] = 0xAAAAAA,
+        [colors.cyan] =      0x42DFFA,
+        [colors.blue] =      0x7853FF,
+        [colors.brown] =     0xb18624,
+        [colors.green] =     0x00FF00,
+        [colors.red] =       0xFF0000,
+        [colors.black] =     0x000000
+    },
+    scale = 0.5
+})
+
+bigterm._forEachMonitor(function(mon, i)
+    print(mon.x, mon.y, mon.p.getSize())
+end)
+
+--bigterm._blitpixel(1, 21, "A")
+
+local w, h = bigterm.getSize()
+print(w, h)
+
+--for y = 1, h do
+--    for x = 1, w do
+--        bigterm._blitpixel(
+--            x,
+--            y,
+--            string.char((x + y * 16 - 16) % 256),
+--            string.format("%x", (x - y) % 16),
+--            string.format("%x", (x + y) % 16)
+--        )
+--    end
+--end
+
+bigterm.setTextColor(colors.white)
+bigterm.setBackgroundColor(colors.black)
+
+bigterm.clear()
+
+if false then
+    local lines = require("cc.strings").wrap(io.lines("cc-stuff/beemovie.txt")(), w)
+    for i, line in ipairs(lines) do
+        bigterm.setCursorPos(1, i)
+        bigterm.setTextColor(2 ^ (i % 2))
+        bigterm.write(line)
+        if i == h then break end
+    end
+end
+
+for t = 0, 31 do
+    for y = 1, h do
+        local res = {}
+        for x = 0, w do
+            table.insert(res, string.format("%x", bit.bxor(x, y * t + 1) % 16))
+        end
+        res = table.concat(res)
+        bigterm.setCursorPos(1, y)
+        bigterm.blit(res, res, string.rep("f", #res))
+    end
+    os.sleep(0.05)
+end
+
+local ccpi = require("ccpi")
+local img = ccpi.load("cc-stuff/cpi-images/cute.cpi")
+
+local ys = {}
+for y = 1, img.h do table.insert(ys, y) end
+
+for i = 1, #ys do
+    local a, b = math.random(1, #ys), math.random(1, #ys)
+    ys[a], ys[b] = ys[b], ys[a]
+end
+
+for i, y in ipairs(ys) do
+    bigterm.setCursorPos(1, y)
+    bigterm.blit(img.lines[y].s, img.lines[y].fg, img.lines[y].bg)
+    os.sleep(0.05)
+end
+
+for i = 1, 16 do
+    bigterm.setPaletteColor(bit.blshift(1, i - 1), img.palette[i])
+    os.sleep(0.10)
+end
+

bigterm.lua

@@ -0,0 +1,231 @@
+local expect = require("cc.expect").expect
+local function todo() error("todo!") end
+local pretty = require "cc.pretty"
+
+local BigTerm = {
+    write = function(self, text)
+        local w = self.getSize()
+        for i = 1, #text do
+            if self._pos.x <= w then
+                self._blitpixel(
+                    self._pos.x,
+                    self._pos.y,
+                    text:sub(i, i),
+                    self._colorChar(self._colorForeground),
+                    self._colorChar(self._colorBackground)
+                    )
+                self._pos.x = self._pos.x + 1
+            end
+        end
+    end,
+    blit = function(self, text, foreground, background)
+        local x, y = self._pos.x, self._pos.y
+        local w = #text
+        local LIMIT = 0
+        local ox = 1
+        while w > 0 and LIMIT < 20 do
+            local mon, i, lx, ly = self._getMonitorForScreenPos(x, y)
+            if not mon then break end
+            local remaining = mon._w - lx
+            mon.p.setCursorPos(lx + 1, ly + 1)
+            mon.p.blit(
+                text:sub(ox, ox + w),
+                foreground:sub(ox, ox + w - 1),
+                background:sub(ox, ox + w - 1)
+            )
+            w = w - remaining
+            x = x + remaining
+            ox = ox + remaining
+        end
+    end,
+    clear = function(self)
+        self._forEachMonitor(function(mon)
+            mon.p.clear()
+        end)
+    end,
+    clearLine = function(self) todo() end,
+    scroll = function(self, n)
+        -- TODO: NOPE! store framebuffer and write lines onto other screens
+        self._forEachMonitor(function(mon)
+            mon.p.scroll(n)
+        end)
+    end,
+
+    getCursorPos = function(self) return self._pos.x, self._pos.y end,
+    setCursorPos = function(self, x, y)
+        self._pos.x = x
+        self._pos.y = y
+        -- TODO: move cursor to the correct monitor and hide it from others
+    end,
+
+    setCursorBlink = function(self, state) todo() end,
+    getCursorBlink = function(self) todo() end,
+
+    isColor = function(self) return true end,
+    getSize = function(self)
+        local w, h = 0, 0
+        for ix = 1, self._w do
+            local mon = self._findMonitor(ix, 1)
+            w = w + mon._w
+        end
+        for iy = 1, self._h do
+            local mon = self._findMonitor(1, iy)
+            h = h + mon._h
+        end
+        return w, h
+    end,
+
+    setTextColor = function(self, fg)
+        self._forEachMonitor(function(mon)
+            mon.p.setTextColor(fg)
+        end)
+        self._colorForeground = fg
+    end,
+    getTextColor = function(self) todo() end,
+
+    setBackgroundColor = function(self, bg)
+        self._forEachMonitor(function(mon)
+            mon.p.setBackgroundColor(bg)
+        end)
+        self._colorBackground = bg
+    end,
+    getBackgroundColor = function(self) todo() end,
+
+    setTextScale = function(self, scale)
+        self._scale = scale
+        self._reset()
+    end,
+    getTextScale = function(self)
+        return self._scale
+    end,
+
+    setPaletteColor = function(self, index, color, g, b)
+        expect(1, index, "number")
+        expect(2, color, "number")
+        expect(3, g, "number", "nil")
+        expect(4, b, "number", "nil")
+        if index < 0 or index > 32768 or math.log(index, 2) % 1 ~= 0 then
+            error("index out of range")
+        end
+
+        local r = color
+        if g == nil or b == nil then
+            if color < 0 or color > 0xFFFFFF then
+                error("color out of range")
+            end
+            r = bit.band(0xFF, bit.brshift(color, 16)) / 255
+            g = bit.band(0xFF, bit.brshift(color, 8)) / 255
+            b = bit.band(0xFF, bit.brshift(color, 0)) / 255
+        else
+            if r < 0 or r > 1.0 then error("red channel out of range") end
+            if g < 0 or g > 1.0 then error("green channel out of range") end
+            if b < 0 or b > 1.0 then error("blue channel out of range") end
+        end
+
+        self._palette[index] = bit.bor(
+            bit.blshift(math.floor(r * 255), 16),
+            bit.blshift(math.floor(g * 255), 8),
+            bit.blshift(math.floor(b * 255), 0)
+        )
+        self._forEachMonitor(function(mon)
+            mon.p.setPaletteColor(index, r, g, b)
+        end)
+    end,
+    getPaletteColor = function(self, index) todo() end,
+
+    -- internals
+
+    _colorChar = function(self, v)
+        return string.format("%x", math.floor(math.log(v, 2)))
+    end,
+
+    _reset = function(self)
+        self._w = 1
+        self._h = 1
+        self._forEachMonitor(function(mon, i)
+            mon.p.setTextScale(self._scale)
+            local w, h = mon.p.getSize()
+            self._monitors[i]._w = w
+            self._monitors[i]._h = h
+            if mon.x > self._w then self._w = mon.x end
+            if mon.y > self._h then self._h = mon.y end
+            for id, color in pairs(self._palette) do
+                mon.p.setPaletteColor(id, color)
+            end
+        end)
+    end,
+
+    _blitpixel = function(self, x, y, c, bg, fg)
+        bg = bg or "0"
+        fg = fg or "f"
+        local mon = self._getMonitorForScreenPos(x, y)
+        mon.p.setCursorPos(((x - 1) % mon._w) + 1, ((y - 1) % mon._h) + 1)
+        mon.p.blit(c, bg, fg)
+    end,
+
+    _findMonitor = function(self, x, y)
+        for i = 1, #self._monitors do
+            local mon = self._monitors[i]
+            if mon.x == x and mon.y == y then
+                return mon, i
+            end
+        end
+    end,
+
+    _getMonitorForScreenPos = function(self, x, y)
+        local oy = 1
+        for iy = 1, self._h do
+            local ox = 1
+            for ix = 1, self._w do
+                local mon, i = self._findMonitor(ix, iy)
+                if x >= ox and x < (ox + mon._w) and y >= oy and y < (oy + mon._h) then
+                    return mon, i, x - ox, y - oy
+                end
+                ox = ox + mon._w
+            end
+            local mon, i = self._findMonitor(1, iy)
+            oy = oy + mon._h
+        end
+    end,
+
+    _forEachMonitor = function(self, fun)
+        for i = 1, #self._monitors do
+            fun(self._monitors[i], i)
+        end
+    end,
+
+}
+
+local lib = {}
+function lib.fromFile(conf)
+    local fp = assert(io.open(conf, "r"))
+    local conf = textutils.unserializeJSON(fp:read("a"))
+    fp:close()
+    local monitors = {}
+    for addr, pos in pairs(conf.monitors) do
+        local p = assert(peripheral.wrap(addr))
+        table.insert(monitors, { p = p, x = pos.x, y = pos.y })
+    end
+    return lib.new(monitors, { palette = conf.palette, scale = conf.scale })
+end
+function lib.new(monitors, args)
+    args = args or {}
+    local mon = setmetatable({
+            _monitors = monitors,
+            _pos = { x = 1, y = 1 },
+            _blink = false,
+            _colorForeground = colors.white,
+            _colorBackground = colors.black,
+            _scale = args.scale or 1.0,
+            _palette = args.palette or {},
+        }, { __index = BigTerm })
+    for name, method in pairs(BigTerm) do
+        if type(method) == "function" then
+            mon[name] = function(...) return method(mon, ...) end
+        end
+    end
+    mon._reset()
+    return mon
+end
+
+return lib

btccshow.lua

@@ -0,0 +1,26 @@
+local args = { ... }
+local ccpi = require("ccpi")
+local bigterm = require("bigterm").fromFile("/bigterm.json")
+
+local img, err = ccpi.load(args[1])
+if not img then
+    printError(err)
+    return
+end
+
+local ys = {}
+for y = 1, img.h do table.insert(ys, y) end
+
+for i = 1, math.floor((#ys) / 2), 2 do
+    local a, b = i, (#ys - 1) - i + 1
+    ys[a], ys[b] = ys[b], ys[a]
+end
+
+for i, y in ipairs(ys) do
+    bigterm.setCursorPos(1, y)
+    bigterm.blit(img.lines[y].s, img.lines[y].fg, img.lines[y].bg)
+end
+
+for i = 1, 16 do
+    bigterm.setPaletteColor(bit.blshift(1, i - 1), img.palette[i])
+end

btccslideshow.lua

@@ -0,0 +1,47 @@
+local args = { ... }
+local ccpi = require("ccpi")
+local bigterm = require("bigterm")
+
+local conf_path = "/bigterm.json"
+if args[1] == "-c" then
+    table.remove(args, 1)
+    conf_path = table.remove(args, 1)
+end
+local screen = bigterm.fromFile(conf_path)
+
+local time = 10
+if args[1] == "-t" then
+    table.remove(args, 1)
+    time = tonumber(table.remove(args, 1))
+end
+
+local files = fs.list(args[1])
+
+while true do
+    local img, err = ccpi.load(fs.combine(args[1], files[math.random(1, #files)]))
+    if not img then
+        printError(err)
+        return
+    else
+        local ys = {}
+        for y = 1, img.h do table.insert(ys, y) end
+
+        for i = 1, math.floor((#ys) / 2), 2 do
+            local a, b = i, (#ys - 1) - i + 1
+            ys[a], ys[b] = ys[b], ys[a]
+        end
+
+        for i, y in ipairs(ys) do
+            screen.setCursorPos(1, y)
+            screen.blit(img.lines[y].s, img.lines[y].fg, img.lines[y].bg)
+            if (i % 10) == 0 then
+                os.sleep(0)
+            end
+        end
+
+        for i = 1, 16 do
+            screen.setPaletteColor(bit.blshift(1, i - 1), img.palette[i])
+        end
+    end
+    os.sleep(time)
+end

cc-pic.py

@@ -0,0 +1,412 @@
+#!/usr/bin/env python3
+
+from typing import BinaryIO, TextIO
+from PIL import Image, ImageColor
+from argparse import ArgumentParser, RawTextHelpFormatter
+from textwrap import dedent
+from functools import lru_cache
+
+try:
+    PALETTE_ADAPTIVE = Image.Palette.ADAPTIVE
+except Exception:
+    PALETTE_ADAPTIVE = Image.ADAPTIVE
+
+
+class Converter:
+    CC_COLORS = [
+        ("0", "colors.white"),
+        ("1", "colors.orange"),
+        ("2", "colors.magenta"),
+        ("3", "colors.lightBlue"),
+        ("4", "colors.yellow"),
+        ("5", "colors.lime"),
+        ("6", "colors.pink"),
+        ("7", "colors.gray"),
+        ("8", "colors.lightGray"),
+        ("9", "colors.cyan"),
+        ("a", "colors.purple"),
+        ("b", "colors.blue"),
+        ("c", "colors.brown"),
+        ("d", "colors.green"),
+        ("e", "colors.red"),
+        ("f", "colors.black"),
+    ]
+
+    DEFAULT_PALETTE = [
+        240, 240, 240,
+        242, 178, 51,
+        229, 127, 216,
+        153, 178, 242,
+        222, 222, 108,
+        127, 204, 25,
+        242, 178, 204,
+        76, 76, 76,
+        153, 153, 153,
+        76, 153, 178,
+        178, 102, 229,
+        51, 102, 204,
+        127, 102, 76,
+        87, 166, 78,
+        204, 76, 76,
+        17, 17, 17
+    ]
+
+    DEFAULT_GRAYSCALE_PALETTE = [
+        0xf0, 0xf0, 0xf0,
+        0x9d, 0x9d, 0x9d,
+        0xbe, 0xbe, 0xbe,
+        0xbf, 0xbf, 0xbf,
+        0xb8, 0xb8, 0xb8,
+        0x76, 0x76, 0x76,
+        0xd0, 0xd0, 0xd0,
+        0x4c, 0x4c, 0x4c,
+        0x99, 0x99, 0x99,
+        0x87, 0x87, 0x87,
+        0xa9, 0xa9, 0xa9,
+        0x77, 0x77, 0x77,
+        0x65, 0x65, 0x65,
+        0x6e, 0x6e, 0x6e,
+        0x76, 0x76, 0x76,
+        0x11, 0x11, 0x11
+    ]
+
+    PIX_BITS = [[1, 2], [4, 8], [16, 0]]
+
+    MAX_DIFF = 3 * 255
+
+    def __init__(self, image: Image.Image, palette: list[int] | int = PALETTE_ADAPTIVE, dither: bool = True):
+        dither_mode = Image.Dither.FLOYDSTEINBERG if dither else Image.Dither.NONE
+        if isinstance(palette, list):
+            img_pal = Image.new("P", (1, 1))
+            img_pal.putpalette(palette)
+            self._img = image.quantize(len(palette) // 3, palette=img_pal, dither=dither_mode)
+        else:
+            self._img = image.convert("P", palette=palette, colors=16, dither=dither_mode)
+
+        self._imgdata = self._img.load()
+        self._palette: list[int] = self._img.getpalette() or []
+        if len(self._palette) < 16 * 3:
+            self._palette += [0] * ((16 * 3) - len(self._palette))
+
+    @lru_cache
+    def _brightness(self, i: int) -> float:
+        r, g, b = self._palette[i * 3 : (i + 1) * 3]
+        return (r + g + b) / 768
+
+    @lru_cache
+    def _distance(self, a: int, b: int) -> float:
+        r1, g1, b1 = self._palette[a * 3 : (a + 1) * 3]
+        r2, g2, b2 = self._palette[b * 3 : (b + 1) * 3]
+        rd, gd, bd = r1 - r2, g1 - g2, b1 - b2
+        return (rd * rd + gd * gd + bd * bd) / self.MAX_DIFF
+
+    @lru_cache
+    def _get_colors(self, x: int, y: int) -> tuple[int, int]:
+        brightest_i, brightest_l = 0, 0
+        darkest_i, darkest_l = 0, 768
+        for oy, line in enumerate(self.PIX_BITS):
+            for ox in range(len(line)):
+                pix = self._imgdata[x + ox, y + oy]
+                assert pix < 16, f"{pix} is too big at {x+ox}:{y+oy}"
+                brightness = self._brightness(pix)
+                if brightness > brightest_l:
+                    brightest_l, brightest_i = brightness, pix
+                if brightness < darkest_l:
+                    darkest_l, darkest_i = brightness, pix
+        return darkest_i, brightest_i
+
+    @lru_cache()
+    def _is_darker(self, bg: int, fg: int, c: int) -> bool:
+        return self._distance(bg, c) < self._distance(fg, c)
+
+    def _get_block(self, x: int, y: int) -> tuple[int, int, int]:
+        dark_i, bri_i = self._get_colors(x, y)
+        assert dark_i < 16, f"{dark_i} is too big"
+        assert bri_i < 16, f"{bri_i} is too big"
+        out: int = 0
+        for oy, line in enumerate(self.PIX_BITS):
+            for ox, bit in enumerate(line):
+                if not self._is_darker(
+                    dark_i, bri_i, self._imgdata[x + ox, y + oy]
+                ):
+                    out |= bit
+        # bottom right pixel fix?
+        if not self._is_darker(dark_i, bri_i, self._imgdata[x + 1, y + 2]):
+            out ^= 31
+            dark_i, bri_i = bri_i, dark_i
+        return out, dark_i, bri_i
+
+    @staticmethod
+    def _write_varint(fp: BinaryIO, value: int):
+        value &= 0xFFFFFFFF
+        mask: int = 0xFFFFFF80
+        while True:
+            if (value & mask) == 0:
+                fp.write(bytes([value & 0xFF]))
+                return
+            fp.write(bytes([(value & 0x7F) | 0x80]))
+            value >>= 7
+
+    def export_binary(self, io: BinaryIO, version: int = -1):
+        if version == -2:
+            for y in range(0, self._img.height - 2, 3):
+                line: bytearray = bytearray()
+                for x in range(0, self._img.width - 1, 2):
+                    ch, bg, fg = self._get_block(x, y)
+                    line.extend([(ch + 0x80) & 0xFF, fg << 4 | bg])
+                io.write(line)
+            return
+        if version == -1:
+            if self._img.width <= 255 * 2 and self._img.height < 255 * 3:
+                version = 0
+            else:
+                version = 1
+
+        if version == 0:
+            io.write(b"CCPI")  # old format
+            io.write(bytes([self._img.width // 2, self._img.height // 3, 0]))
+            io.write(bytes(self._palette[: 16 * 3]))
+        elif version == 1:
+            io.write(b"CPI\x01")  # CPIv1
+            self._write_varint(io, self._img.width // 2)
+            self._write_varint(io, self._img.height // 3)
+            io.write(bytes(self._palette[: 16 * 3]))
+        else:
+            raise ValueError(f"invalid version {version}")
+
+        for y in range(0, self._img.height - 2, 3):
+            line: bytearray = bytearray()
+            for x in range(0, self._img.width - 1, 2):
+                ch, bg, fg = self._get_block(x, y)
+                line.extend([(ch + 0x80) & 0xFF, fg << 4 | bg])
+            io.write(line)
+
+    def export(self, io: TextIO):
+        io.write("local m = peripheral.find('monitor')\n")
+        io.write("m.setTextScale(0.5)\n")
+        io.write(f"-- image: {self._img.width}x{self._img.height}\n")
+        io.write("\n")
+        io.write("-- configuring palette\n")
+        for i in range(16):
+            r, g, b = self._palette[i * 3 : (i + 1) * 3]
+            io.write(
+                f"m.setPaletteColor({self.CC_COLORS[i][1]}, 0x{r:02x}{g:02x}{b:02x})\n"
+            )
+        io.write("\n")
+        io.write("-- writing pixels\n")
+
+        for i, y in enumerate(range(0, self._img.height - 2, 3), 1):
+            s = []
+            bgs = ""
+            fgs = ""
+            io.write(f"m.setCursorPos(1, {i}); ")
+            for x in range(0, self._img.width - 1, 2):
+                ch, bg, fg = self._get_block(x, y)
+                s.append(ch + 0x80)
+                bgs += self.CC_COLORS[bg][0]
+                fgs += self.CC_COLORS[fg][0]
+            io.write(
+                "m.blit(string.char(%s), '%s', '%s')\n"
+                % (str.join(", ", map(str, s)), fgs, bgs)
+            )
+
+
+def main():
+    parser = ArgumentParser(
+        description="ComputerCraft Palette Image converter",
+        formatter_class=RawTextHelpFormatter,
+    )
+    parser.add_argument(
+        "-t",
+        dest="textmode",
+        action="store_true",
+        help="Output a Lua script instead of binary image",
+    )
+    parser.add_argument(
+        "-D",
+        dest="nodither",
+        action="store_true",
+        help="Disable dithering"
+    )
+    parser.add_argument(
+        "-W",
+        dest="width",
+        default=4 * 8 - 1,
+        type=int,
+        help="Width in characters",
+    )
+    parser.add_argument(
+        "-H",
+        dest="height",
+        default=3 * 6 - 2,
+        type=int,
+        help="Height in characters",
+    )
+    parser.add_argument(
+        "-V",
+        dest="cpi_version",
+        type=int,
+        default=-1,
+        choices=(-2, -1, 0, 1),
+        help=dedent(
+            """\
+            Force specific CPI version to be used.
+            Only applies to binary format.
+            Valid versions:
+                -V -2       Uses raw format. No headers, default palette.
+                            Used for OBCB-CC project.
+                -V -1       Choose any fitting one
+                            For images smaller than 255x255, uses CPIv0
+                -V 0        OG CPI, 255x255 maximum, uncompressed
+                -V 1        CPIv1, huge images, uncompressed"""
+        ),
+    )
+    parser.add_argument(
+        "-p",
+        dest="placement",
+        choices=("center", "cover", "tile", "full", "extend", "fill"),
+        default="full",
+        help=dedent(
+            """\
+            Image placement mode (same as in hsetroot)
+                -p center       Render image centered on screen
+                -p cover        Centered on screen, scaled to fill fully
+                -p tile         Render image tiles
+                -p full         Maximum aspect ratio
+                -p extend       Same as "full" but filling borders
+                -p fill         Stretch to fill"""
+        ),
+    )
+    parser.add_argument(
+        "-P",
+        dest="palette",
+        default="auto",
+        help=dedent(
+            """\
+            Palette to be used for that conversion.
+            Should be 16 colors or less
+            Valid options are:
+                -P auto         Determine palette automatically
+                -P default      Use default CC:Tweaked color palette
+                -P defaultgray  Use default CC:Tweaked grayscale palette
+                -P "list:#RRGGBB,#RRGGBB,..."   Use a set list of colors
+                -P "cpi:path"   Load palette from a CCPI file
+                -P "gpl:path"   Parse GIMP palette file and use first 16 colors
+                -P "txt:path"   Load palette from a list of hex values
+            """
+        )
+    )
+    parser.add_argument("image_path")
+    parser.add_argument("output_path")
+
+    args = parser.parse_args()
+
+    with Image.new("RGB", (args.width * 2, args.height * 3)) as canv:
+        with Image.open(args.image_path).convert("RGB") as img:
+            if args.placement == "fill":
+                canv.paste(img.resize(canv.size), (0, 0))
+            elif args.placement in ("full", "extend", "cover"):
+                aspect = canv.width / img.width
+                if (img.height * aspect > canv.height) != (
+                    args.placement == "cover"
+                ):
+                    aspect = canv.height / img.height
+                new_w, new_h = int(img.width * aspect), int(
+                    img.height * aspect
+                )
+                top = int((canv.height - new_h) / 2)
+                left = int((canv.width - new_w) / 2)
+                resized_img = img.resize((new_w, new_h))
+                canv.paste(resized_img, (left, top))
+                if args.placement == "extend":
+                    if left > 0:
+                        right = left - 1 + new_w
+                        w = 1
+                        while right + w < canv.width:
+                            canv.paste(
+                                canv.crop(
+                                    (left + 1 - w, 0, left + 1, canv.height)
+                                ),
+                                (left + 1 - w * 2, 0),
+                            )
+                            canv.paste(
+                                canv.crop((right, 0, right + w, canv.height)),
+                                (right + w, 0),
+                            )
+                            w *= 2
+                    if top > 0:
+                        bottom = top - 1 + new_h
+                        h = 1
+                        while bottom + h < canv.height:
+                            canv.paste(
+                                canv.crop(
+                                    (0, top + 1 - h, canv.width, top + 1)
+                                ),
+                                (top + 1 - h * 2, 0),
+                            )
+                            canv.paste(
+                                canv.crop((0, bottom, canv.width, bottom + h)),
+                                (0, bottom + h),
+                            )
+                            h *= 2
+
+            elif args.placement in ("center", "tile"):
+                left = int((canv.width - img.width) / 2)
+                top = int((canv.height - img.height) / 2)
+                if args.placement == "tile":
+                    while left > 0:
+                        left -= img.width
+                    while top > 0:
+                        top -= img.height
+                    x = left
+                    while x < canv.width:
+                        y = top
+                        while y < canv.height:
+                            canv.paste(img, (x, y))
+                            y += img.height
+                        x += img.width
+                else:
+                    canv.paste(img, (left, top))
+            else:
+                pass
+
+            palette = PALETTE_ADAPTIVE
+            if args.cpi_version == -2:
+                args.palette = "default"
+
+            if args.palette == "auto":
+                palette = PALETTE_ADAPTIVE
+            elif args.palette == "default":
+                palette = Converter.DEFAULT_PALETTE
+            elif args.palette == "defaultgray":
+                palette = Converter.DEFAULT_GRAYSCALE_PALETTE
+            elif args.palette.startswith("txt:"):
+                with open(args.palette[4:], "r") as fp:
+                    palette = []
+                    for line in fp:
+                        palette += ImageColor.getcolor(line.strip(), "RGB")  # type: ignore
+                        assert len(palette) <= 16 * 3
+            elif args.palette.startswith("list:"):
+                palette = []
+                for c in args.palette[5:].split(","):
+                    palette += ImageColor.getcolor(c, "RGB")  # type: ignore
+                    assert len(palette) <= 16 * 3
+            elif args.palette.startswith("cpi:"):
+                raise ValueError("not implemented yet")
+            elif args.palette.startswith("gpl:"):
+                raise ValueError("not implemented yet")
+            else:
+                raise ValueError(f"invalid palette identifier: {args.palette!r}")
+
+            converter = Converter(canv, palette, dither=not args.nodither)
+            converter._img.save("/tmp/_ccpictmp.png")
+            if args.textmode:
+                with open(args.output_path, "w") as fp:
+                    converter.export(fp)
+            else:
+                with open(args.output_path, "wb") as fp:
+                    converter.export_binary(fp, args.cpi_version)
+
+
+if __name__ == "__main__":
+    main()

ccpi.lua

@@ -0,0 +1,129 @@
+
+local decoders = {}
+
+local function read_palette_full(palette, fp)
+    for i = 1, 16 do
+        palette[i] = bit.blshift(string.byte(fp.read(1)), 16)
+        palette[i] = bit.bor(palette[i], bit.blshift(string.byte(fp.read(1)), 8))
+        palette[i] = bit.bor(palette[i], string.byte(fp.read(1)))
+    end
+end
+
+local function read_pixeldata_v0(image, fp)
+    for y = 1, image.h do
+        local line = { s = "", bg = "", fg = "" }
+        for x = 1, image.w do
+            local data = fp.read(2)
+            if data == nil or #data == 0 then
+                return nil, string.format("Failed to read character at x=%d y=%d", x, y)
+            end
+
+            line.s = line.s .. data:sub(1, 1)
+            local color = string.byte(data, 2, 2)
+
+            if color == nil then
+                return nil, string.format("Failed to read color data for x=%d y=%d", x, y)
+            end
+            line.bg = line.bg .. string.format("%x", bit.band(0xF, color))
+            line.fg = line.fg .. string.format("%x", bit.band(0xF, bit.brshift(color, 4)))
+        end
+        table.insert(image.lines, line)
+    end
+    return true
+end
+
+local function read_varint(fp)
+    local value = 0
+    local current = 0
+    local offset = 0
+    repeat
+        if offset >= 5 then return nil, "varint too long" end
+        current = string.byte(fp.read(1))
+        value = bit.bor(value, bit.blshift(bit.band(current, 0x7f), offset * 7))
+        offset = offset + 1
+    until bit.band(current, 0x80) == 0
+    return value
+end
+
+decoders[0] = function(image, fp)
+    image.w, image.h = string.byte(fp.read(1)), string.byte(fp.read(1))
+    image.scale = 0.5 + string.byte(fp.read(1)) * 5 / 255
+    read_palette_full(image.palette, fp)
+    local success, err = read_pixeldata_v0(image, fp)
+    if not success then return false, err end
+    return true
+end
+
+decoders[1] = function(image, fp)
+    image.w = read_varint(fp)
+    image.h = read_varint(fp)
+    image.scale = 0.5 -- CPIv1 doesn't have a scale property
+    read_palette_full(image.palette, fp)
+    local success, err = read_pixeldata_v0(image, fp)
+    if not success then return false, err end
+    return true
+end
+
+local function parse(fp)
+    local res
+    local image = { w = 0, h = 0, scale = 1.0, palette = {}, lines = {} }
+
+    local magic = fp.read(4)
+    if magic == "CCPI" then
+        res, err = decoders[0](image, fp)
+    elseif magic:sub(1, 3) == "CPI" then
+        local version = magic:byte(4, 4)
+        if decoders[version] == nil then
+            return nil, string.format("Invalid CPI version 0x%02x", version)
+        end
+        res, err = decoders[version](image, fp)
+    else
+        return nil, "Invalid header: expected CCPI got " .. magic
+    end
+
+    if not res then return false, err end
+    return image
+end
+
+local function load(path)
+    local fp, err = io.open(path, "rb")
+    if not fp then return nil, err end
+    local img
+    img, err = parse(fp._handle)
+    fp:close()
+    return img, err
+end
+
+local function draw(img, ox, oy, monitor)
+    -- todo: add expect()
+    local t = monitor or term.current()
+    ox = ox or 1
+    oy = oy or 1
+
+    if not t.setPaletteColor then
+        return nil, "setPaletteColor is not supported on this term"
+    end
+
+    if not t.setTextScale and img.scale ~= 1 then
+        return nil, "setTextScale is not supported on this term"
+    end
+
+    for i = 1, 16 do
+        t.setPaletteColor(bit.blshift(1, i - 1), img.palette[i])
+    end
+
+    if img.scale ~= 1 then
+        t.setTextScale(img.scale)
+    end
+
+    for y = 1, img.h do
+        t.setCursorPos(ox, oy + y - 1)
+        t.blit(img.lines[y].s, img.lines[y].fg, img.lines[y].bg)
+    end
+end
+
+return {
+    load = load,
+    draw = draw,
+    parse = parse
+}

ccshow.lua

@@ -0,0 +1,17 @@
+local ccpi = require("ccpi")
+local args = { ... }
+
+local terminal = term.current()
+if args[1] == "-m" then
+    table.remove(args, 1)
+    terminal = peripheral.wrap(table.remove(args, 1))
+end
+
+local img, err = ccpi.load(args[1])
+if not img then
+    printError(err)
+    return
+end
+
+terminal.clear()
+ccpi.draw(img, 1, 1, terminal)

convert-video.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/bash
+
+set -e
+export TMP_DIR="$(mktemp -d)";
+
+cleanup() {
+    rm -fr "${TMP_DIR}";
+}
+
+trap cleanup EXIT
+
+
+export INPUT="$1";
+export OUTPUT="$(realpath "$2")";
+export BASE_URL="$3"
+
+if [ -z "${BASE_URL}" ]; then
+    export BASE_URL="CHANGEME";
+fi
+
+
+mkdir -p "${OUTPUT}"
+
+export ORIG="$(pwd)";
+
+cd "${TMP_DIR}"
+
+ffmpeg -i "${INPUT}" -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" -map '[left]' -f s8 -ac 1 -ar 48k "${OUTPUT}/left.s8" -map '[right]' -f s8 -ac 1 -ar 48k "${OUTPUT}/right.s8"
+ffmpeg -i "${INPUT}" -vf fps=20 frame%04d.png
+
+ls frame*.png | parallel 'echo {}; python3 ${ORIG}/cc-pic.py -W 164 -H 81 -p cover {} ${OUTPUT}/{.}.cpi'
+rm frame*.png
+
+cd "${ORIG}"
+
+export FRAME_COUNT="$(ls ${OUTPUT}/*.cpi | wc -l)";
+
+printf '{"frame_time": 0.05, "frame_count": %d, "video": "%s", "audio": {"l": "%s", "r": "%s"}}\n' "${FRAME_COUNT}" "${BASE_URL}/frame%04d.cpi" "${BASE_URL}/left.s8" "${BASE_URL}/right.s8" > "${OUTPUT}/info.json"
+

custom-colors.lua

@@ -0,0 +1,21 @@
+local customColors = {
+    [colors.white] =     0xEFEFEF,
+    [colors.orange] =    0xD99F82,
+    [colors.magenta] =   0x464A73,
+    [colors.lightBlue] = 0xA1D5E6,
+    [colors.yellow] =    0xE6CCA1,
+    [colors.lime] =      0x86BF8F,
+    [colors.pink] =      0xC98F8F,
+    [colors.gray] =      0x515151,
+    [colors.lightGray] = 0xA3A3A3,
+    [colors.cyan] =      0xC2F2F2,
+    [colors.blue] =      0x6699CC,
+    [colors.brown] =     0x735F4B,
+    [colors.green] =     0x6DA18A,
+    [colors.red] =       0xBD555F,
+    [colors.black] =     0x131313
+}
+
+for id, color in pairs(customColors) do
+    term.setPaletteColor(id, color)
+end

dependencies/mongoose

@@ -0,0 +1 @@
+Subproject commit 3525f044f551816dc1469f445fc16b94d51a1e78

dependencies/stb

@@ -0,0 +1 @@
+Subproject commit f75e8d1cad7d90d72ef7a4661f1b994ef78b4e31

dh/dh.lua

@@ -0,0 +1,71 @@
+local ecc = require("ecc")
+
+string.toHex = function(str)
+    return str:gsub(".", function(ch) return string.format("%02x", ch:byte()) end)
+end
+string.fromHex = function(hex)
+    return hex:gsub("%x%x", function(d) return string.char(tonumber(d, 16)) end)
+end
+
+local keypair = {}
+if fs.exists("/.id_dh.json") then
+    local fp = io.open("/.id_dh.json", "r")
+    local d = textutils.unserializeJSON(fp:read())
+    keypair.sk = string.fromHex(d.secret)
+    keypair.pk = string.fromHex(d.public)
+    fp:close()
+else
+    printError("no identity found, generating...")
+    local sk, pk = ecc.keypair(ecc.random.random())
+    io.open("/.id_dh.json", "w"):write(textutils.serializeJSON({
+        secret = string.toHex(sk),
+        public = string.toHex(pk)
+    })):close()
+    keypair.sk = string.char(table.unpack(sk))
+    keypair.pk = string.char(table.unpack(pk))
+end
+
+print("pubkey: "..string.toHex(keypair.pk))
+
+local running = true
+
+local known_hosts = {}
+
+parallel.waitForAll(function() while running do -- dh:discover sender
+    rednet.broadcast(keypair.pk, "dh:discover")
+    os.sleep(10)
+end end,
+function() while running do -- dh:discover handler
+    local id, pk, proto = rednet.receive("dh:discover")
+    if proto == "dh:discover" then
+        print("DH discover from "..id.." with key "..pk)
+        local nonce = string.toHex(ecc.random.random())
+        local key = ecc.exchange(keypair.sk, pk)
+        known_hosts[id] = {
+            id = id,
+            pk = pk,
+            sk = key,
+            verified = false,
+            nonce = nonce,
+            t = os.clock()
+        }
+        known_hosts[pk] = known_hosts[id]
+        rednet.send(id, {
+            pk = keypair.pk,
+            msg = ecc.encrypt(nonce, key)
+        }, "dh:pair")
+    end
+end end,
+function() while running do -- dh:pair handler
+    local id, msg, proto = rednet.receive("dh:pair")
+    if proto == "dh:pair" then
+        local key = ecc.exchange(keypair.sk, msg.pk)
+        known_hosts[id] = {
+            id = id,
+            pk = msg.pk,
+            sk = key,
+            verified = false,
+            nonce = ecc.decrypt(msg.msg, msg.msg)
+        }
+    end
+end end)

events.lua

@@ -0,0 +1,15 @@
+local pretty = require("cc.pretty")
+
+while true do
+    local evd = { os.pullEvent() }
+    local ev, evd = table.remove(evd, 1), evd
+    if ev == "key_up" and evd[1] == keys.q then
+        break
+    elseif ev == "term_resize" then
+        local w, h = term.getSize()
+        print("term_resize", w, h)
+    else
+        io.write(ev.." ")
+        pretty.print(pretty.pretty(evd))
+    end
+end

gitea-clone.lua

@@ -0,0 +1,75 @@
+local pretty = require("cc.pretty")
+
+local args = { ... }
+
+local instance, user, repo = args[1]:match("https?://([^/]+)/([^/]+)/([^/]+)")
+
+local function getContents(path)
+    local url = "https://" .. instance .. "/api/v1/repos/" .. user .. "/" .. repo .. "/contents" .. (path and ("/" .. path) or "")
+    local res, err = http.get(url)
+    if not res then
+        printError(err)
+        return nil, err
+    end
+    return textutils.unserializeJSON(res:readAll())
+end
+
+local function walkRepository(basedir, callback)
+    local res, err = getContents(basedir)
+    if not res then
+        return nil, err
+    end
+    for _, elem in ipairs(res) do
+        if elem.type == "file" then
+            callback(elem.path, elem)
+        elseif elem.type == "dir" then
+            walkRepository(elem.path, callback)
+        else
+            printError("unknown type: " .. elem.type)
+        end
+    end
+end
+
+local function downloadFile(url, path)
+    local fp, err = io.open(path, "wb")
+    if not fp then
+        return nil, err
+    end
+
+    local rq
+    rq, err = http.get(url, nil, true)
+    if not rq then
+        return nil, err
+    end
+
+    local headers = rq.getResponseHeaders()
+    local length = tonumber(headers["Content-Length"]) or 1
+
+    local written = 0
+    local i = 0
+    local _, y = term.getCursorPos()
+    while true do
+        local chunk = rq.read(100)
+        if not chunk then break end
+        fp:write(chunk)
+        written = written + #chunk
+
+        term.setCursorPos(1, y)
+        term.clearLine()
+
+        local w = math.min(25, math.floor(written * 25 / length))
+        term.write("["..string.rep("=", w)..string.rep(" ", 25-w).."] ")
+        term.write(string.format("%7.3f%% %s", 100 * written / length, path))
+        i = i + 1
+        if (i % 20) == 0 then
+            sleep(0.1)
+        end
+    end
+    fp:close()
+    print()
+end
+
+
+walkRepository(nil, function(path, file)
+    downloadFile(file.download_url, repo.."-clone/"..path)
+end)

img2cpi.c

@@ -0,0 +1,924 @@
+// x-run: ~/scripts/runc.sh % -Wall -Wextra -lm --- ~/images/boykisser.png cpi-images/boykisser.cpi
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb/stb_image.h>
+#define STB_IMAGE_RESIZE_IMPLEMENTATION
+#include <stb/stb_image_resize2.h>
+#include <argp.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <strings.h>
+#include <stdbool.h>
+
+#define MAX_COLOR_DIFFERENCE 768
+
+struct rgba { uint8_t r, g, b, a; };
+union color {
+  struct rgba rgba;
+  uint32_t v;
+};
+struct cc_char {
+  unsigned char character;
+  unsigned char bg, fg;
+};
+
+const extern char font_atlas[256][11];
+const extern union color DEFAULT_PALETTE[16], DEFAULT_GRAY_PALETTE[16];
+
+struct arguments {
+  bool fast_mode;
+  int width, height;
+  enum cpi_version {
+    CPI_VERSION_AUTO,
+    CPI_VERSION_RAW,
+    CPI_VERSION_0,
+    CPI_VERSION_1,
+    CPI_VERSION_2,
+  } cpi_version;
+  enum placement {
+    PLACEMENT_CENTER,
+    PLACEMENT_COVER,
+    PLACEMENT_TILE,
+    PLACEMENT_FULL,
+    PLACEMENT_EXTEND,
+    PLACEMENT_FILL
+  } placement;
+  enum palette_type {
+    PALETTE_DEFAULT,
+    PALETTE_DEFAULT_GRAY,
+    PALETTE_AUTO,
+    PALETTE_PATH,
+    PALETTE_LIST
+  } palette_type;
+  char *palette;
+  char *input_path;
+  char *output_path;
+} args = {
+  .fast_mode = false,
+  .width = 4 * 8 - 1, // 4x3 blocks screen
+  .height = 3 * 6 - 2,
+  .cpi_version = CPI_VERSION_AUTO,
+  .placement = PLACEMENT_FULL,
+  .input_path = NULL,
+  .output_path = NULL,
+  .palette = NULL,
+  .palette_type = PALETTE_DEFAULT // TODO(kc): change to PALETTE_AUTO when
+                                  // k-means is implemented
+};
+
+struct image {
+  int w, h;
+  union color *pixels;
+};
+
+struct image_pal {
+  int w, h;
+  uint8_t *pixels;
+  const union color *palette;
+  size_t palette_size;
+};
+
+bool parse_cmdline(int argc, char **argv);
+void show_help(const char *progname, bool show_all, FILE *fp);
+struct image *image_load(const char *fp);
+struct image *image_new(int w, int h);
+struct image *image_resize(struct image *original, int new_w, int new_h);
+struct image_pal *image_quantize(struct image *original, const union color *colors, size_t n_colors);
+float get_color_difference(union color a, union color b);
+float get_color_brightness(union color clr);
+void image_unload(struct image *img);
+void get_size_keep_aspect(int w, int h, int dw, int dh, int *ow, int *oh);
+
+void convert_2x3(const struct image_pal *img, struct cc_char *characters);
+void convert_8x11(const struct image_pal *img, struct cc_char *characters);
+
+const char *known_file_extensions[] = {
+  ".png", ".jpg", ".jpeg", ".jfif", ".jpg", ".gif",
+  ".tga", ".bmp", ".hdr", ".pnm", 0
+};
+
+static const struct optiondocs {
+  char shortopt;
+  char *longopt;
+  char *target;
+  char *doc;
+  struct optiondocs_choice { char *value; char *doc; } *choices;
+} optiondocs[] = {
+  { 'h', "help",        0,            "Show help", 0 },
+  { 'f', "fast",        0,            "Use fast (old) method for picking characters and colors", 0 },
+  { 'W', "width",       "width",      "Width in characters", 0 },
+  { 'h', "height",      "height",     "Height in characters", 0 },
+  { 'P', "palette",     "palette",    "Use specific palette.\n"
+             "                        `auto` uses automatic selection\n"
+             "                        `default` uses default palette\n"
+             "                        `defaultgray` uses default grayscale palette\n"
+             "                        `list:#RRGGBB,#RRGGBB,...` uses hard-coded one\n"
+             "                        `txt:PATH` reads hex colors from each line in a file\n", 0 },
+  { 'V', "cpi_version", "version",    "Force specific version of CPI",
+    (struct optiondocs_choice[]) {
+      { "-2,raw", "Use raw format. No headers, no palette, just characters and colors" },
+      { "-1,auto", "Choose best available" },
+      { "0", "OG CPI, 255x255, uncompressed" },
+      { "1", "CPIv1, huge images, uncompressed" },
+      { "255", "In-dev version, may not work" },
+      { 0, 0 } } },
+  { 'p', "placement",   "placement",  "Image placement mode (same as in hsetroot)",
+    (struct optiondocs_choice[]){
+      { "center", "Render image centered on the canvas" },
+      { "cover",  "Centered on screen, scaled to fill fully" },
+      { "tile",   "Render image tiled" },
+      { "full",   "Use maximum aspect ratio" },
+      { "extend", "Same as \"full\", but filling borders" },
+      { "fill",   "Stretch to fill" },
+      { 0, 0 } } },
+  { 0,   0,             "input.*",    "Input file path", 0 },
+  { 0,   0,             "output.cpi", "Output file path", 0 },
+  { 0 }
+};
+
+int main(int argc, char **argv) {
+  if (!parse_cmdline(argc, argv)) {
+    show_help(argv[0], false, stderr);
+    fprintf(stderr, "Fatal error occurred, exiting.\n");
+    return EXIT_FAILURE;
+  }
+  struct image *src_image = image_load(args.input_path);
+  if (!src_image) {
+    fprintf(stderr, "Error: failed to open the file\n");
+    return EXIT_FAILURE;
+  }
+
+  struct image *canvas;
+  if (args.fast_mode) {
+    canvas = image_new(args.width * 2, args.height * 3);
+  } else {
+    canvas = image_new(args.width * 8, args.height * 11);
+  }
+
+  if (!canvas) {
+    fprintf(stderr, "Error: failed to allocate second image buffer\n");
+    return EXIT_FAILURE;
+  }
+
+  // TODO: load palette, maybe calculate it too? k-means?
+  const union color *palette = DEFAULT_PALETTE;
+  switch (args.palette_type) {
+    case PALETTE_DEFAULT: palette = DEFAULT_PALETTE; break;
+    case PALETTE_DEFAULT_GRAY: palette = DEFAULT_GRAY_PALETTE; break;
+    case PALETTE_AUTO: assert(0 && "Not implemented"); break;
+    case PALETTE_LIST: assert(0 && "Not implemented"); break;
+    case PALETTE_PATH: assert(0 && "Not implemented"); break;
+    default: assert(0 && "Unreachable");
+  }
+
+  // TODO: properly scale
+  struct image *scaled_image;
+  {
+    int new_w, new_h;
+    get_size_keep_aspect(src_image->w, src_image->h, canvas->w, canvas->h, &new_w, &new_h);
+
+    scaled_image = image_resize(src_image, new_w, new_h);
+    if (!scaled_image) {
+      fprintf(stderr, "Error: failed to open the file\n");
+      return EXIT_FAILURE;
+    }
+  }
+
+  // TODO: position image properly
+  int small_w = scaled_image->w < canvas->w ? scaled_image->w : canvas->w;
+  int small_h = scaled_image->h < canvas->h ? scaled_image->h : canvas->h;
+  for (int y = 0; y < small_h; y++) {
+    memcpy(&canvas->pixels[y * canvas->w],
+           &scaled_image->pixels[y * scaled_image->w],
+           small_w * sizeof(union color));
+  }
+
+  // TODO: actually do stuff
+  struct cc_char *characters = calloc(args.width * args.height, sizeof(struct cc_char));
+
+  struct image_pal *quantized_image = image_quantize(canvas, palette, 16);
+  if (!quantized_image) {
+    fprintf(stderr, "Error: failed to open the file\n");
+    return EXIT_FAILURE;
+  }
+
+  if (args.fast_mode) {
+    convert_2x3(quantized_image, characters);
+  } else {
+    convert_8x11(quantized_image, characters);
+  }
+
+  // TODO: implement something other than CPIv0
+  FILE *fp = fopen(args.output_path, "wb");
+  fwrite("CCPI", 1, 4, fp);
+  fputc(args.width, fp);
+  fputc(args.height, fp);
+  fputc(0x00, fp);
+  for (int i = 0; i < 16; i++) {
+    fputc(palette[i].rgba.r, fp);
+    fputc(palette[i].rgba.g, fp);
+    fputc(palette[i].rgba.b, fp);
+  }
+  for (int i = 0; i < args.width * args.height; i++) {
+    fputc(characters[i].character, fp);
+    fputc(characters[i].bg | (characters[i].fg << 4), fp);
+  }
+  fclose(fp);
+
+  image_unload(src_image);
+  image_unload(canvas);
+  return EXIT_SUCCESS;
+}
+
+bool parse_cmdline(int argc, char **argv) {
+  static struct option options[] = {
+    { "help",         no_argument,        0, 'h' },
+    { "fast",         no_argument,        0, 'f' },
+    { "width",        required_argument,  0, 'W' },
+    { "height",       required_argument,  0, 'H' },
+    { "cpi_version",  required_argument,  0, 'V' },
+    { "placement",    required_argument,  0, 'p' },
+    { "palette",      required_argument,  0, 'P' },
+    { 0,              0,                  0,  0  }
+  };
+
+  while (true) {
+    int option_index = 0;
+    int c = getopt_long(argc, argv, "hfW:H:V:p:P:", options, &option_index);
+    if (c == -1) break;
+    if (c == 0) c = options[option_index].val;
+    if (c == '?') break;
+
+    switch (c) {
+      case 'h': // --help
+        show_help(argv[0], true, stdout);
+        exit(EXIT_SUCCESS);
+        break;
+      case 'f': // --fast
+        args.fast_mode = true;
+        if (args.cpi_version != CPI_VERSION_AUTO) {
+          fprintf(stderr, "Warning: text mode ignores version\n");
+        }
+        break;
+      case 'W': // --width
+        args.width = atoi(optarg);
+        break;
+      case 'H': // --height
+        args.height = atoi(optarg);
+        break;
+      case 'V': // --cpi_version
+        {
+          if (0 == strcmp(optarg, "auto") || 0 == strcmp(optarg, "-1")) {
+            args.cpi_version = CPI_VERSION_AUTO;
+          } else if (0 == strcmp(optarg, "raw") || 0 == strcmp(optarg, "-2")) {
+            args.cpi_version = CPI_VERSION_RAW;
+          } else if (0 == strcmp(optarg, "0")) {
+            args.cpi_version = CPI_VERSION_0;
+          } else if (0 == strcmp(optarg, "1")) {
+            args.cpi_version = CPI_VERSION_1;
+          } else if (0 == strcmp(optarg, "2")) {
+            args.cpi_version = CPI_VERSION_2;
+          }
+        }
+        break;
+      case 'p': // --placement
+        if (0 == strcmp(optarg, "center")) {
+          args.placement = PLACEMENT_CENTER;
+        } else if (0 == strcmp(optarg, "cover")) {
+          args.placement = PLACEMENT_COVER;
+        } else if (0 == strcmp(optarg, "tile")) {
+          args.placement = PLACEMENT_TILE;
+        } else if (0 == strcmp(optarg, "full")) {
+          args.placement = PLACEMENT_FULL; }
+        else if (0 == strcmp(optarg, "extend")) {
+          args.placement = PLACEMENT_EXTEND;
+        } else if (0 == strcmp(optarg, "fill")) {
+          args.placement = PLACEMENT_FILL;
+        } else {
+          fprintf(stderr, "Error: invaild placement %s\n", optarg);
+          return false;
+        }
+        break;
+      case 'P': // --palette
+        if (0 == strcmp(optarg, "default")) {
+          args.palette_type = PALETTE_DEFAULT;
+        } else if (0 == strcmp(optarg, "defaultgray")) {
+          args.palette_type = PALETTE_DEFAULT_GRAY;
+        } else if (0 == strcmp(optarg, "auto")) {
+          args.palette_type = PALETTE_AUTO;
+        } else if (0 == strncmp(optarg, "list:", 5)) {
+          args.palette_type = PALETTE_LIST;
+          args.palette = &optarg[5];
+        } else {
+          fprintf(stderr, "Error: invaild palette %s\n", optarg);
+          return false;
+        }
+        break;
+    }
+  }
+
+  if (optind == argc) {
+    fprintf(stderr, "Error: no input file provided\n");
+    return false;
+  } else if (optind + 1 == argc) {
+    fprintf(stderr, "Error: no output file provided\n");
+    return false;
+  } else if ((argc - optind) != 2) {
+    fprintf(stderr, "Error: too many arguments\n");
+    return false;
+  }
+
+  args.input_path = argv[optind];
+  args.output_path = argv[optind + 1];
+
+  const char *extension = strrchr(args.input_path, '.');
+  if (!extension) {
+    fprintf(stderr, "Warning: no file extension, reading may fail!\n");
+  } else {
+    bool known = false;
+    for (int i = 0; known_file_extensions[i] != 0; i++) {
+      if (0 == strcasecmp(known_file_extensions[i], extension)) {
+        known = true;
+        break;
+      }
+    }
+    if (!known) {
+      fprintf(stderr, "Warning: unknown file extension %s, reading may fail!\n", extension);
+    }
+  }
+
+  return true;
+}
+
+void show_help(const char *progname, bool show_all, FILE *fp) {
+  fprintf(fp, "usage: %s", progname);
+  for (int i = 0; optiondocs[i].doc != 0; i++) {
+    struct optiondocs doc = optiondocs[i];
+    fprintf(fp, " [");
+    if (doc.shortopt) fprintf(fp, "-%c", doc.shortopt);
+    if (doc.shortopt && doc.longopt) fprintf(fp, "|");
+    if (doc.longopt) fprintf(fp, "--%s", doc.longopt);
+    if (doc.target) {
+      if (doc.shortopt || doc.longopt) fprintf(fp, " ");
+      fprintf(fp, "%s", doc.target);
+    }
+    fprintf(fp, "]");
+  }
+  fprintf(fp, "\n");
+
+  if (!show_all) return;
+
+  fprintf(fp, "\n");
+  fprintf(fp, "ComputerCraft Palette Image converter\n");
+  fprintf(fp, "\n");
+  fprintf(fp, "positional arguments:\n");
+  for (int i = 0; optiondocs[i].doc != 0; i++) {
+    struct optiondocs doc = optiondocs[i];
+    if (!doc.shortopt && !doc.longopt) {
+      fprintf(fp, "  %s\t%s\n", doc.target, doc.doc);
+    }
+  }
+  fprintf(fp, "\n");
+  fprintf(fp, "options:\n");
+  for (int i = 0; optiondocs[i].doc != 0; i++) {
+    struct optiondocs doc = optiondocs[i];
+    if (!doc.shortopt && !doc.longopt) { continue; }
+    fprintf(fp, "  ");
+    int x = 2;
+    if (doc.shortopt) { fprintf(fp, "-%c", doc.shortopt); x += 2; }
+    if (doc.shortopt && doc.longopt) { fprintf(fp, ", "); x += 2; }
+    if (doc.longopt) { fprintf(fp, "--%s", doc.longopt); x += strlen(doc.longopt) + 2; }
+    if (doc.choices) {
+      fprintf(fp, " {");
+      for (int j = 0; doc.choices[j].value != 0; j++) {
+        if (j > 0) { fprintf(fp, ","); x += 1; }
+        fprintf(fp, "%s", doc.choices[j].value);
+        x += strlen(doc.choices[j].value);
+      }
+      fprintf(fp, "}");
+      x += 3;
+    } else if (doc.target) {
+      fprintf(fp, " ");
+      fprintf(fp, "%s", doc.target);
+      x += strlen(doc.target) + 1;
+    }
+    if (x > 24) fprintf(fp, "\n%24c", ' ');
+    else fprintf(fp, "%*c", 24 - x, ' ');
+
+    fprintf(fp, "%s\n", doc.doc);
+
+    if (doc.choices) {
+      for (int j = 0; doc.choices[j].value != 0; j++) {
+        fprintf(fp, "%26c", ' ');
+        if (doc.shortopt) fprintf(fp, "-%c ", doc.shortopt);
+        else if (doc.longopt) fprintf(fp, "--%s", doc.longopt);
+        fprintf(fp, "%-12s %s\n", doc.choices[j].value, doc.choices[j].doc);
+      }
+    }
+  }
+}
+
+struct image *image_load(const char *fp) {
+  struct image *img = calloc(1, sizeof(struct image));
+  if (!img) return NULL;
+  img->pixels = (union color*)stbi_load(fp, &img->w, &img->h, 0, 4);
+  if (!img->pixels) {
+    free(img);
+    return NULL;
+  }
+  return img;
+}
+
+struct image *image_new(int w, int h) {
+  struct image *img = calloc(1, sizeof(struct image));
+  if (!img) return NULL;
+  img->pixels = calloc(h, sizeof(union color) * w);
+  img->w = w;
+  img->h = h;
+  if (!img->pixels) {
+    free(img);
+    return NULL;
+  }
+  return img;
+}
+
+struct image *image_resize(struct image *original, int new_w, int new_h) {
+  struct image *resized = image_new(new_w, new_h);
+  if (!resized) return NULL;
+  stbir_resize_uint8_srgb((unsigned char *)original->pixels, original->w, original->h, 0,
+                          (unsigned char *)resized->pixels, resized->w, resized->h, 0,
+                          STBIR_RGBA);
+  return resized;
+}
+
+void image_unload(struct image *img) {
+  free(img->pixels);
+  free(img);
+}
+
+void get_size_keep_aspect(int w, int h, int dw, int dh, int *ow, int *oh)
+{
+  *ow = dw;
+  *oh = dh;
+  float ratio = (float)w / (float)h;
+  float ratio_dst = (float)dw / (float)dh;
+  int tmp_1, tmp_2;
+  if (ratio_dst >= ratio)
+  {
+    tmp_1 = floor(dh * ratio);
+    tmp_2 = ceil(dh * ratio);
+    if (fabsf(ratio - (float)tmp_1 / dh) < fabsf(ratio - (float)tmp_2 / dh))
+      *ow = tmp_1 < 1 ? 1 : tmp_1;
+    else
+      *ow = tmp_2 < 1 ? 1 : tmp_2;
+  }
+  else
+  {
+    tmp_1 = floor(dw / ratio);
+    tmp_2 = ceil(dw / ratio);
+    if (tmp_2 == 0 ||
+        fabs(ratio - (float)dw / tmp_1) < fabs(ratio - (float)dw / tmp_2))
+      (*oh) = tmp_1 < 1 ? 1 : tmp_1;
+    else
+      (*oh) = tmp_2 < 1 ? 1 : tmp_2;
+  }
+}
+
+struct image_pal *image_quantize(struct image *original, const union color *colors, size_t n_colors) {
+  struct image_pal *out = calloc(1, sizeof(struct image_pal));
+  out->w = original->w;
+  out->h = original->h;
+  out->pixels = calloc(original->w, original->h);
+  out->palette = colors;
+  out->palette_size = n_colors;
+
+  for (int i = 0; i < out->w * out->h; i++) {
+    int closest_color = 0;
+    float closest_distance = 1e20;
+    for (int color = 0; color < n_colors; color++) {
+      float dist = get_color_difference(colors[color], original->pixels[i]);
+      if (dist <= closest_distance) {
+        closest_distance = dist;
+        closest_color = color;
+      }
+    }
+    out->pixels[i] = closest_color;
+  }
+
+  return out;
+}
+
+float get_color_difference(union color a, union color b) {
+  int dr = a.rgba.r - b.rgba.r,
+      dg = a.rgba.g - b.rgba.g,
+      db = a.rgba.b - b.rgba.b;
+  return dr * dr + dg * dg + db * db;
+}
+
+float get_color_brightness(union color clr) {
+  return get_color_difference(clr, (union color){ .v = 0 });
+}
+
+void convert_2x3(const struct image_pal *img, struct cc_char *characters) {
+  int w = img->w / 2, h = img->h / 3;
+  for (int y = 0; y < h; y++) {
+    for (int x = 0; x < w; x++) {
+      unsigned char darkest_i = 0, brightest_i = 0;
+      float darkest_diff = 0xffffff, brightest_diff = 0;
+
+      for (int oy = 0; oy < 3; oy++) {
+        for (int ox = 0; ox < 2; ox++) {
+          unsigned char pix = img->pixels[ox + (x + (y * 3 + oy) * w) * 2];
+          float brightness = get_color_brightness(img->palette[pix]);
+          if (brightness >= brightest_diff) {
+            brightest_i = pix;
+            brightest_diff = brightness;
+          }
+          if (brightness <= darkest_diff) {
+            darkest_i = pix;
+            darkest_diff = brightness;
+          }
+        }
+      }
+
+      unsigned char bitmap = 0;
+      const static unsigned char pixel_bits[3][2] = { { 1, 2}, { 4, 8 }, { 16, 0 } };
+      for (int oy = 0; oy < 3; oy++) {
+        for (int ox = 0; ox < 2; ox++) {
+          if (ox == 1 && oy == 2) continue;
+          unsigned char pix = img->pixels[ox + (x + (y * 3 + oy) * w) * 2];
+          float diff_bg = get_color_difference(img->palette[darkest_i], img->palette[pix]);
+          float diff_fg = get_color_difference(img->palette[brightest_i], img->palette[pix]);
+          if (diff_fg < diff_bg) {
+            bitmap |= pixel_bits[oy][ox];
+          }
+        }
+      }
+
+      {
+        unsigned char pix = img->pixels[1 + (x + (y * 3 + 2) * w) * 2];
+        float diff_bg = get_color_difference(img->palette[darkest_i], img->palette[pix]);
+        float diff_fg = get_color_difference(img->palette[brightest_i], img->palette[pix]);
+        if (diff_fg < diff_bg) {
+          bitmap ^= 31;
+          unsigned char tmp = darkest_i;
+          darkest_i = brightest_i;
+          brightest_i = tmp;
+        }
+      }
+
+      characters[x + y * w].character = 0x80 + bitmap;
+      characters[x + y * w].bg = darkest_i;
+      characters[x + y * w].fg = brightest_i;
+    }
+  }
+}
+
+void convert_8x11(const struct image_pal *img, struct cc_char *characters) {
+  int w = img->w / 8, h = img->h / 11;
+  float palette_self_diffs[0x100][0x10] = {{(float) 0xffffff}};
+  for (int input_color = 0x0; input_color < 0x100 && input_color < img->palette_size; input_color++) {
+    for (int output_color = 0x0; output_color < 0x10 && output_color < img->palette_size; output_color++) {
+      palette_self_diffs[input_color][output_color] = get_color_difference(img->palette[input_color], img->palette[output_color]);
+    }
+  }
+
+  for (int y = 0; y < h; y++) {
+    for (int x = 0; x < w; x++) {
+      float chunk_palette_diffs[8][11][0x10] = {{{(float) 0xffffff}}};
+      for (int ox = 0; ox < 8; ox++) {
+        for (int oy = 0; oy < 11; oy++) {
+          uint8_t pixel_unresolved = img->pixels[
+            ox + (x + (y * 11 + oy) * w) * 8
+          ];
+          for (int color = 0x0; color < 0x10 && color < img->palette_size; color++) {
+            chunk_palette_diffs[ox][oy][color] = palette_self_diffs[pixel_unresolved][color];
+          }
+        }
+      }
+
+      float min_diff = 0xffffff;
+      char closest_sym = 0x00, closest_color = 0xae;
+      for (int sym = 0x01; sym <= 0xFF; sym++) {
+        if (sym == '\t' || sym == '\n' || sym == '\r' || sym == '\x0e') {
+          continue;
+        }
+        for (int color = 0x00; color <= 0xff; color++) {
+          float difference = 0;
+          for (int oy = 0; oy < 11; oy++) {
+            unsigned char sym_line = font_atlas[sym][oy];
+            for (int ox = 0; ox < 8; ox++) {
+              bool lit = sym_line & (0x80 >> ox);
+              difference += chunk_palette_diffs[ox][oy][lit ? color >> 4 : color & 0xF];
+            }
+          }
+          if (difference <= min_diff) {
+            min_diff = difference;
+            closest_sym = sym;
+            closest_color = color;
+          }
+        }
+      }
+      characters[x + y * w].character = closest_sym;
+      characters[x + y * w].bg = closest_color & 0xF;
+      characters[x + y * w].fg = closest_color >> 4;
+    }
+  }
+}
+
+const union color DEFAULT_PALETTE[16] = {
+  { { 0xf0, 0xf0, 0xf0, 0xff } },
+  { { 0xf2, 0xb2, 0x33, 0xff } },
+  { { 0xe5, 0x7f, 0xd8, 0xff } },
+  { { 0x99, 0xb2, 0xf2, 0xff } },
+  { { 0xde, 0xde, 0x6c, 0xff } },
+  { { 0x7f, 0xcc, 0x19, 0xff } },
+  { { 0xf2, 0xb2, 0xcc, 0xff } },
+  { { 0x4c, 0x4c, 0x4c, 0xff } },
+  { { 0x99, 0x99, 0x99, 0xff } },
+  { { 0x4c, 0x99, 0xb2, 0xff } },
+  { { 0xb2, 0x66, 0xe5, 0xff } },
+  { { 0x33, 0x66, 0xcc, 0xff } },
+  { { 0x7f, 0x66, 0x4c, 0xff } },
+  { { 0x57, 0xa6, 0x4e, 0xff } },
+  { { 0xcc, 0x4c, 0x4c, 0xff } },
+  { { 0x11, 0x11, 0x11, 0xff } }
+}, DEFAULT_GRAY_PALETTE[16] = {
+  { { 0xf0, 0xf0, 0xf0, 0xff } },
+  { { 0x9d, 0x9d, 0x9d, 0xff } },
+  { { 0xbe, 0xbe, 0xbe, 0xff } },
+  { { 0xbf, 0xbf, 0xbf, 0xff } },
+  { { 0xb8, 0xb8, 0xb8, 0xff } },
+  { { 0x76, 0x76, 0x76, 0xff } },
+  { { 0xd0, 0xd0, 0xd0, 0xff } },
+  { { 0x4c, 0x4c, 0x4c, 0xff } },
+  { { 0x99, 0x99, 0x99, 0xff } },
+  { { 0x87, 0x87, 0x87, 0xff } },
+  { { 0xa9, 0xa9, 0xa9, 0xff } },
+  { { 0x77, 0x77, 0x77, 0xff } },
+  { { 0x65, 0x65, 0x65, 0xff } },
+  { { 0x6e, 0x6e, 0x6e, 0xff } },
+  { { 0x76, 0x76, 0x76, 0xff } },
+  { { 0x11, 0x11, 0x11, 0xff } }
+};
+
+const char font_atlas[256][11] = {
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x6c, 0x44, 0x54, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x7c, 0x54, 0x7c, 0x44, 0x6c, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x28, 0x7c, 0x7c, 0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x38, 0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x38, 0x10, 0x7c, 0x7c, 0x10, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x38, 0x7c, 0x7c, 0x10, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x18, 0x3c, 0x3c, 0x18, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x7e, 0x7e, 0x66, 0x42, 0x42, 0x66, 0x7e, 0x7e, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x1c, 0x0c, 0x34, 0x48, 0x48, 0x30, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x44, 0x44, 0x38, 0x10, 0x38, 0x10, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x3c, 0x24, 0x3c, 0x20, 0x60, 0x60, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x3e, 0x22, 0x3e, 0x22, 0x66, 0x66, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x40, 0x70, 0x7c, 0x70, 0x40, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x04, 0x1c, 0x7c, 0x1c, 0x04, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x38, 0x7c, 0x10, 0x10, 0x7c, 0x38, 0x10, 0x00, 0x00, },
+  { 0x00, 0x24, 0x24, 0x24, 0x24, 0x24, 0x00, 0x24, 0x00, 0x00, 0x00, },
+  { 0x00, 0x3c, 0x54, 0x54, 0x34, 0x14, 0x14, 0x14, 0x00, 0x00, 0x00, },
+  { 0x00, 0x3c, 0x60, 0x58, 0x44, 0x34, 0x0c, 0x78, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x3c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x38, 0x7c, 0x10, 0x7c, 0x38, 0x10, 0x7c, 0x00, 0x00, },
+  { 0x00, 0x10, 0x38, 0x7c, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x10, 0x10, 0x10, 0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x18, 0x7c, 0x18, 0x10, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x30, 0x7c, 0x30, 0x10, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x40, 0x7c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x24, 0x7e, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x10, 0x38, 0x38, 0x7c, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x7c, 0x38, 0x38, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x14, 0x14, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x28, 0x28, 0x7c, 0x28, 0x7c, 0x28, 0x28, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x3c, 0x40, 0x38, 0x04, 0x78, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x48, 0x08, 0x10, 0x20, 0x24, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x28, 0x10, 0x34, 0x58, 0x48, 0x34, 0x00, 0x00, 0x00, },
+  { 0x00, 0x08, 0x08, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x0c, 0x10, 0x20, 0x20, 0x20, 0x10, 0x0c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x30, 0x08, 0x04, 0x04, 0x04, 0x08, 0x30, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x24, 0x18, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x10, 0x7c, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x10, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x04, 0x08, 0x08, 0x10, 0x20, 0x20, 0x40, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x4c, 0x54, 0x64, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x30, 0x10, 0x10, 0x10, 0x10, 0x7c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x04, 0x18, 0x20, 0x44, 0x7c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x04, 0x18, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x0c, 0x14, 0x24, 0x44, 0x7c, 0x04, 0x04, 0x00, 0x00, 0x00, },
+  { 0x00, 0x7c, 0x40, 0x78, 0x04, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x18, 0x20, 0x40, 0x78, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x7c, 0x44, 0x04, 0x08, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x44, 0x38, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x44, 0x3c, 0x04, 0x08, 0x30, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x10, 0x10, 0x10, 0x00, 0x00, },
+  { 0x00, 0x04, 0x08, 0x10, 0x20, 0x10, 0x08, 0x04, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x7c, 0x00, 0x00, 0x7c, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x20, 0x10, 0x08, 0x04, 0x08, 0x10, 0x20, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x04, 0x08, 0x10, 0x00, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x3c, 0x42, 0x5a, 0x5a, 0x5e, 0x40, 0x3c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x7c, 0x44, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x78, 0x44, 0x78, 0x44, 0x44, 0x44, 0x78, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x40, 0x40, 0x40, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x78, 0x44, 0x44, 0x44, 0x44, 0x44, 0x78, 0x00, 0x00, 0x00, },
+  { 0x00, 0x7c, 0x40, 0x70, 0x40, 0x40, 0x40, 0x7c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x7c, 0x40, 0x70, 0x40, 0x40, 0x40, 0x40, 0x00, 0x00, 0x00, },
+  { 0x00, 0x3c, 0x40, 0x4c, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x44, 0x7c, 0x44, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x10, 0x10, 0x10, 0x10, 0x10, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x48, 0x70, 0x48, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x7c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x6c, 0x54, 0x44, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x64, 0x54, 0x4c, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x44, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x78, 0x44, 0x78, 0x40, 0x40, 0x40, 0x40, 0x00, 0x00, 0x00, },
+  { 0x00, 0x38, 0x44, 0x44, 0x44, 0x44, 0x48, 0x34, 0x00, 0x00, 0x00, },
+  { 0x00, 0x78, 0x44, 0x78, 0x44, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x3c, 0x40, 0x38, 0x04, 0x04, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x7c, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x44, 0x44, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x44, 0x44, 0x44, 0x28, 0x28, 0x10, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x44, 0x44, 0x44, 0x54, 0x6c, 0x44, 0x00, 0x00, 0x00, },
+  { 0x00, 0x44, 0x28, 0x10, 0x28, 0x44, 0x44, 0x44, 0x00, 0x00, 0x00, },
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+  { 0x00, 0x28, 0x00, 0x38, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x10, 0x00, 0x7c, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, },
+  { 0x00, 0x00, 0x00, 0x38, 0x4c, 0x54, 0x64, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x60, 0x00, 0x44, 0x44, 0x44, 0x44, 0x3c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x0c, 0x00, 0x44, 0x44, 0x44, 0x44, 0x3c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x10, 0x28, 0x00, 0x44, 0x44, 0x44, 0x3c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x28, 0x00, 0x44, 0x44, 0x44, 0x44, 0x3c, 0x00, 0x00, 0x00, },
+  { 0x00, 0x0c, 0x00, 0x44, 0x44, 0x44, 0x3c, 0x04, 0x78, 0x00, 0x00, },
+  { 0x00, 0x30, 0x10, 0x18, 0x14, 0x18, 0x10, 0x38, 0x00, 0x00, 0x00, },
+  { 0x00, 0x28, 0x00, 0x44, 0x44, 0x44, 0x3c, 0x04, 0x78, 0x00, 0x00, },
+};

mess/progress-text.lua

@@ -0,0 +1,43 @@
+term.clear()
+term.setCursorPos(1, 1)
+term.setTextColor(colors.white)
+
+local tw, th = term.getSize()
+print(string.format("Terminal: %dx%d", tw, th))
+local function printScale(c1, c2, p, fmt, ...)
+    local str = string.format(fmt, ...)
+    local w1 = math.ceil(p * tw)
+    local w2 = tw - w1
+
+    local bg = term.getBackgroundColor()
+    term.setBackgroundColor(c1)
+    term.write(str:sub(1, w1))
+    local rem = w1 - #str
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(c2)
+    term.write(str:sub(w1 + 1, w1 + w2))
+
+    rem = math.min(tw - #str, w2)
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(bg)
+    print()
+end
+
+
+term.setBackgroundColor(colors.black)
+local t = 0
+while true do
+    for i = 1, th do
+        local p = 0.5 + 0.5 * math.sin((i + t) * math.pi / 25)
+        term.setCursorPos(1, i)
+        printScale(colors.red, colors.gray, p, "%7.3f%%", p * 100)
+    end
+    os.sleep(0.05)
+    t = t + 1
+end

mess/scrolling-text.lua

@@ -0,0 +1,42 @@
+
+local lines = { "owo" }
+for line in io.lines("cc-stuff/mess/scrolling-text.lua") do
+    table.insert(lines, line)
+end
+
+local function drawScrollingText(x, y, w, time, t)
+    term.setCursorPos(x, y)
+    if #t <= w then
+        term.write(t)
+        return
+    end
+    time = (time % (#t + 5)) + 1
+    term.write((t .. " ::: " .. t):sub(time, time + w - 1))
+end
+
+term.clear()
+term.setCursorPos(1, 1)
+term.setCursorBlink(false)
+
+parallel.waitForAny(
+function()
+    local time = 0
+    while true do
+        local tw, th = term.getSize()
+        for i = 1, th do
+            local txt = lines[((#lines - th + i - 1) % #lines) + 1]
+            drawScrollingText(math.floor(tw / 2) - i, i, i * 2, time, txt)
+            drawScrollingText(math.floor(tw / 2) - i, i, i * 2, time, txt)
+        end
+        time = time + 1
+        os.sleep(0.05)
+    end
+end,
+function()
+    os.pullEvent("key")
+end,
+function()
+    os.sleep(10)
+end)
+
+print("exited")

mess/tmpc.lua

@@ -0,0 +1,637 @@
+settings.define("mplayer.colors.bg", {
+    description = "Background color in media player",
+    default = 0x131313, -- #131313
+    type = number
+})
+
+settings.define("mplayer.colors.fg", {
+    description = "Text color in media player",
+    default = 0xEFEFEF, -- #EFEFEF
+    type = number
+})
+
+settings.define("mplayer.colors.cursor", {
+    description = "Color of the cursor",
+    default = 0x8080EF, -- #8080EF
+    type = number
+})
+
+settings.define("mplayer.colors.current", {
+    description = "Color of the currently playing song",
+    default = 0xEFEF80, -- #EFEF80
+    type = number
+})
+
+settings.define("mplayer.colors.status", {
+    description = "Color of the statusbar",
+    default = 0x80EF80, -- #80EF80
+    type = number
+})
+
+local tw, th = term.getSize()
+
+os.queueEvent("dummy")
+while tw < 25 or th < 10 do
+    local ev = { os.pullEvent() }
+    term.clear()
+    term.setCursorPos(1, 1)
+    printError("Too small: " .. tw .. "x" .. th .. " < 25x10")
+    printError("Q to exit")
+    printError("Y to ignore")
+
+    local setTextScale = term.current().setTextScale
+    if setTextScale ~= nil then
+        printError("S to try rescaling")
+    end
+    printError("I'll wait while you're adding more")
+
+    if ev[1] == "term_resize" then
+        tw, th = term.getSize()
+    elseif ev[1] == "key" and ev[2] == keys.s and setTextScale ~= nil then
+        setTextScale(0.5)
+    elseif ev[1] == "key" and ev[2] == keys.y then
+        break
+    elseif ev[1] == "key" and ev[2] == keys.q then
+        return
+    end
+end
+
+
+local drive = peripheral.find("tape_drive")
+if not drive then
+    printError("No drive found, starting in dummy mode")
+    local fp = io.open("noita.dfpwm", "rb")
+    if fp == nil then
+        printError("No sample file found, are you running it on a real computer without a tape drive?")
+        return
+    end
+    local size = fp:seek("end", 0)
+    fp:seek("set", 0)
+    drive = {
+        _pos = 0,
+        _fp = fp,
+        _state = "STOPPED",
+        isDummy = true,
+        seek = function(howMuch)
+            drive._pos = math.min(drive.getSize(), math.max(0, drive._pos + howMuch))
+        end,
+        getPosition = function()
+            return drive._pos
+        end,
+        read = function(n)
+            local out = { drive._fp:read(n) }
+            drive.seek(n or 1)
+            return table.unpack(out)
+        end,
+        getSize = function()
+            return size
+        end,
+        getState = function()
+            return drive._state
+        end,
+        play = function()
+            drive._state = "PLAYING"
+        end,
+        stop = function()
+            drive._state = "STOPPED"
+        end,
+        isReady = function()
+            return true
+        end,
+        getLabel = function()
+            return "Dummy drive tape"
+        end,
+        _tick = function()
+            if drive._state == "PLAYING" then
+                drive.read(600)
+            end
+        end,
+    }
+    os.sleep(1)
+end
+
+local function time2str(ti)
+    ti = math.floor(ti)
+    local m, s = math.floor(ti / 60), ti % 60
+    return string.format("%02d:%02d", m, s)
+end
+
+local function read32()
+    local v = 0
+    for i = 1, 4 do
+        local b = string.byte(drive.read(1), 1)
+        v = bit32.bor(bit32.lshift(v, 8), b)
+    end
+    return v
+end
+
+local help = {}
+
+for line in ([[# Movement:
+--
+Up k  : Move cursor up
+Dn j  : Move cursor down
+   H  : Jump to top
+   L  : Jump down
+PgUp  : Page up
+PgDn  : Page down
+
+  Tab : Next screen
+S+Tab : Prev. screen
+
+1 F1  : Help screen
+2 F2  : Songs list
+3 F3  : Settings
+ 
+# Global:
+--
+  s : Stop, jump to start
+  p : Pause/resume
+  < : Next track
+  > : Previous track
+  f : Seek forward
+  b : Seek backward
+\x1b - : Lower volume
+\x1a + : Higher volume
+ 
+# List screen:
+--
+ Enter : Play
+Ctrl+l : Center
+     l : Jump to current
+
+]]):gsub("\\x(..)", function(m)
+    return string.char(tonumber(m, 16))
+end):gmatch("[^\n]+") do
+    table.insert(help, line)
+end
+
+local statusText, statusTicks = nil, 0
+local function setStatus(txt, ticks)
+    statusText, statusTicks = txt, ticks or 10
+end
+
+local mplayer = {
+    colors = {
+        bg = colors.black,
+        fg = colors.white,
+        cursor = colors.blue,
+        current = colors.yellow,
+        status = colors.lime
+    },
+    heldKeys = {},
+    screens = {
+        {
+            title = "Help",
+            scroll = 0,
+            render = function(self)
+                for i = 1, th - 3 do
+                    local line = help[i + self.screens[1].scroll] or "~"
+                    term.setCursorPos(1, i + 1)
+                    term.clearLine()
+                    if line:sub(1, 1) == "~" then
+                        term.setTextColor(self.colors.cursor)
+                    elseif line:sub(1, 1) == "#" then
+                        term.setTextColor(self.colors.current)
+                    elseif line:sub(1, 2) == "--" then
+                        term.setTextColor(self.colors.status)
+                        term.write(("-"):rep(tw - 2))
+                    else
+                        term.setTextColor(self.colors.fg)
+                    end
+                    term.write(line)
+                end
+            end,
+            handleKey = function(self, key, repeating)
+                if key == keys.down or key == keys.j then
+                    self.screens[1].handleScroll(self, 1)
+                elseif key == keys.up or key == keys.k then
+                    self.screens[1].handleScroll(self, -1)
+                elseif key == keys.pageDown then
+                    self.screens[1].handleScroll(self, th - 3)
+                elseif key == keys.pageUp then
+                    self.screens[1].handleScroll(self, -(th - 3))
+                end
+            end,
+            handleScroll = function(self, direction, x, y)
+                self.screens[1].scroll = math.max(0, math.min(th - 1, self.screens[1].scroll + direction))
+            end,
+        },
+        {
+            title = "List",
+            scroll = 0,
+            cursor = 1,
+            textScroll = 0,
+            render = function(self)
+                for i = 1, th - 3 do
+                    local song = self.songs[i + self.screens[2].scroll]
+                    local isCurrent = (i + self.screens[2].scroll) == self.currentSong
+                    local isHovered = (i + self.screens[2].scroll) == self.screens[2].cursor
+                    term.setCursorPos(1, i + 1)
+                    local bg, fg = self.colors.bg, (isCurrent and self.colors.current or self.colors.fg)
+                    if isHovered then bg, fg = fg, bg end
+                    term.setBackgroundColor(bg)
+                    term.setTextColor(fg)
+                    term.clearLine()
+                    if song then
+                        local timeString = " ["..time2str(song.length / 6000) .. "]"
+                        local w = tw - #timeString
+                        if #song.title <= w then
+                            term.write(song.title)
+                        else
+                            local off = isHovered and ((self.screens[2].textScroll % (#song.title + 5)) + 1) or 1
+                            local txt = song.title .. " ::: " .. song.title
+                            term.write(txt:sub(off, off + w - 1))
+                        end
+                        term.setCursorPos(tw - #timeString + 1, i + 1)
+                        term.write(timeString)
+                    end
+                end
+            end,
+            handleKey = function(self, key, repeating)
+                local shiftHeld = self.heldKeys[keys.leftShift] ~= nil or self.heldKeys[keys.rightShift] ~= nil
+                local ctrlHeld = self.heldKeys[keys.leftCtrl] ~= nil or self.heldKeys[keys.rightCtrl] ~= nil
+
+                if key == keys.down or key == keys.j then
+                    self.screens[2].handleScroll(self, 1, 1, 1)
+                elseif key == keys.up or key == keys.k then
+                    self.screens[2].handleScroll(self, -1, 1, 1)
+                elseif key == keys.pageDown then
+                    self.screens[2].handleScroll(self, th - 3, 1, 1)
+                elseif key == keys.pageUp then
+                    self.screens[2].handleScroll(self, -(th - 3), 1, 1)
+                elseif key == keys.h and shiftHeld then
+                    self.screens[2].handleScroll(self, -#self.songs, 1, 1)
+                elseif key == keys.l and shiftHeld then
+                    self.screens[2].handleScroll(self, #self.songs, 1, 1)
+                elseif key == keys.l then
+                    self.screens[2].cursor = self.currentSong or 1
+                    if ctrlHeld then
+                        self.screens[2].scroll = self.screens[2].scroll - math.floor((th - 3) / 2)
+                    end
+                    self.screens[2].handleScroll(self, 0, 1, 1)
+                elseif key == keys.enter then
+                    drive.seek(-drive.getSize())
+                    drive.seek(self.songs[self.screens[2].cursor].offset)
+                    drive.play()
+                    self.currentSong = self.screens[2].cursor
+                end
+            end,
+            handleScroll = function(self, direction, x, y)
+                self.screens[2].cursor = math.max(1, math.min(#self.songs, self.screens[2].cursor + direction))
+                if self.screens[2].scroll + 1 > self.screens[2].cursor then
+                    self.screens[2].scroll = self.screens[2].cursor - 1
+                end
+                local maxi = self.screens[2].scroll + th - 3
+                if self.screens[2].cursor > maxi then
+                    self.screens[2].scroll = self.screens[2].cursor - (th - 3)
+                end
+                if self.screens[2].scroll > #self.songs - (th - 3) then
+                    self.screens[2].scroll = #self.songs - (th - 3)
+                end
+                if self.screens[2].scroll < 0 then
+                    self.screens[2].scroll = 0
+                end
+                self.screens[2].textScroll = 0
+            end,
+            handleClick = function(self, x, y)
+                local i = self.screens[2].scroll + y - 1
+                if i == self.screens[2].cursor then
+                    self.screens[2].handleKey(self, keys.enter, false)
+                elseif i <= #self.songs then
+                    self.screens[2].cursor = i
+                end
+            end,
+        },
+        {
+            title = "Settings",
+            scroll = 0,
+            cursor = 1,
+            render = function(self)
+                term.clear()
+                term.write(string.format("opt = %d, scroll = %d", self.screens[3].cursor, self.screens[3].scroll))
+                term.write(" // TODO")
+            end,
+            handleKey = function(self, key, repeating)
+                if key == keys.down or key == keys.j then
+                    self.screens[3].handleScroll(self, 1)
+                elseif key == keys.up or key == keys.k then
+                    self.screens[3].handleScroll(self, -1)
+                elseif key == keys.pageDown then
+                    self.screens[3].handleScroll(self, th - 3)
+                elseif key == keys.pageUp then
+                    self.screens[3].handleScroll(self, -(th - 3))
+                end
+            end,
+            handleScroll = function(self, direction, x, y)
+                self.screens[3].cursor = math.max(1, math.min(20, self.screens[3].cursor + direction))
+                if self.screens[3].scroll + 1 > self.screens[3].cursor then
+                    self.screens[3].scroll = self.screens[3].cursor - 1
+                end
+                local maxi = self.screens[3].scroll + th - 3
+                if self.screens[3].cursor > maxi then
+                    self.screens[3].scroll = self.screens[3].cursor - (th - 3)
+                end
+            end
+        }
+    },
+    songs = {},
+    currentSong = 0,
+    statusLineScroll = 0,
+    currentScreen = 2,
+}
+
+for k, v in pairs(mplayer.colors) do
+    term.setPaletteColor(v, settings.get("mplayer.colors." .. k))
+end
+term.setCursorPos(1, 1)
+term.setBackgroundColor(mplayer.colors.bg)
+term.setTextColor(mplayer.colors.fg)
+term.clear()
+
+
+local spinner = {
+    "\x81", "\x83", "\x82",
+    "\x8a", "\x88", "\x8c",
+    "\x84", "\x85"
+}
+
+parallel.waitForAny(
+function()
+    while true do
+        -- Current screen
+        term.setCursorPos(1, 2)
+        mplayer.screens[mplayer.currentScreen].render(mplayer)
+
+        -- Top bar
+        term.setCursorPos(1, 1)
+        for i, screen in ipairs(mplayer.screens) do
+            term.setTextColor(mplayer.colors[i == mplayer.currentScreen and "bg" or "fg"])
+            term.setBackgroundColor(mplayer.colors[i == mplayer.currentScreen and "fg" or "bg"])
+            term.write(" "..i..":"..screen.title.." ")
+        end
+
+        term.setBackgroundColor(mplayer.colors.bg)
+
+        local title, time, duration = "Whatever is on the tape", drive.getPosition() / 6000, drive.getSize() / 6000
+        if mplayer.currentSong ~= 0 then
+            local song = mplayer.songs[mplayer.currentSong]
+            time = (drive.getPosition() - song.offset) / 6000
+            duration = song.length / 6000
+            title = song.title
+        end
+
+        -- Progressbar
+        local lw = math.floor(tw * time / duration)
+        term.setCursorPos(1, th - 1)
+        term.setTextColor(mplayer.colors.current)
+        term.clearLine()
+        term.write(string.rep("=", lw))
+        term.write("\x10")
+        term.setTextColor(mplayer.colors.cursor)
+        term.write(string.rep("\xad", tw - lw - 1))
+
+        local timeString = string.format("[%s:%s]", time2str(time), time2str(duration))
+
+        term.setCursorPos(1, th)
+        term.clearLine()
+        if statusTicks > 0 then
+            term.setTextColor(colors.red)
+            term.write(statusText)
+            statusTicks = statusTicks - 1
+        end
+
+        if drive.getState() ~= "STOPPED" then
+            term.setTextColor(mplayer.colors.status)
+
+            if statusTicks <= 0 then
+                local speen = spinner[(math.floor(drive.getPosition() / 3000) % #spinner) + 1]
+                local action = ""
+                if drive.getState() == "PLAYING" then action = "Playing:"
+                elseif drive.getState() == "REWINDING" then action = "Rewinding"
+                elseif drive.getState() == "FORWARDING" then action = "Forwarding"
+                else
+                    printError("Unknown drive state: "..tostring(drive.getState()))
+                    return
+                end
+                action = speen .. " " .. action
+
+                term.write(action)
+
+                -- Statusline text
+                term.setCursorPos(#action + 2, th)
+                local w = tw - #timeString - #action - 2 -- "Playing: ", spinner plus spacing
+
+                term.setTextColor(mplayer.colors.current)
+                if #title <= w then
+                    term.write(title)
+                else
+                    local off = (mplayer.statusLineScroll % (#title + 5)) + 1
+                    local txt = title .. " ::: " .. title
+                    term.write(txt:sub(off, off + w - 1))
+                end
+            end
+        end
+        if statusTicks <= 0 then
+            term.setTextColor(mplayer.colors.status)
+            term.setCursorPos(tw - #timeString + 1, th)
+            term.write(timeString)
+        end
+        os.sleep(0.1)
+    end
+end,
+function()
+    local pretty = require("cc.pretty")
+    while true do
+        local _evd = { os.pullEvent() }
+        local ev, evd = table.remove(_evd, 1), _evd
+        if ev == "key" then
+            mplayer.heldKeys[evd[1]] = evd[2]
+        elseif ev == "key_up" then
+            mplayer.heldKeys[evd[1]] = nil
+        end
+
+        local shiftHeld = mplayer.heldKeys[keys.leftShift] ~= nil or mplayer.heldKeys[keys.rightShift] ~= nil
+        local ctrlHeld = mplayer.heldKeys[keys.leftCtrl] ~= nil or mplayer.heldKeys[keys.rightCtrl] ~= nil
+
+        if ev == "key_up" and evd[1] == keys.q then
+            break
+        elseif ev == "key" and (evd[1] == keys.one or evd[1] == keys.f1) then
+            mplayer.currentScreen = 1
+        elseif ev == "key" and (evd[1] == keys.two or evd[1] == keys.f2) then
+            mplayer.currentScreen = 2
+        elseif ev == "key" and (evd[1] == keys.three or evd[1] == keys.f3) then
+            mplayer.currentScreen = 3
+        elseif ev == "key" and evd[1] == keys.f then
+            drive.seek(3000)
+        elseif ev == "key" and evd[1] == keys.b then
+            drive.seek(-3000)
+        elseif ev == "key" and (evd[1] == keys.comma or evd[1] == keys.period) and shiftHeld then
+            setStatus("Not implemented yet!", 20)
+        elseif ev == "key" and evd[1] == keys.left or evd[1] == keys.right or evd[1] == keys.minus or (evd[1] == keys.equals and shiftHeld) then
+            setStatus("Not implemented yet!", 20)
+        elseif ev == "key" and evd[1] == keys.s then
+            drive.stop()
+            drive.seek(-drive.getSize())
+            drive.seek(6000)
+        elseif ev == "key" and (evd[1] == keys.p or evd[1] == keys.space) then
+            if drive.getState() ~= "STOPPED" then
+                drive.stop()
+            else
+                drive.play()
+            end
+        elseif ev == "key" and evd[1] == keys.tab then
+            local dir = ((mplayer.heldKeys[keys.leftShift] ~= nil) or (mplayer.heldKeys[keys.rightShift] ~= nil)) and -1 or 1
+            mplayer.currentScreen = ((mplayer.currentScreen - 1 + #mplayer.screens + dir)) % #mplayer.screens + 1
+        elseif ev == "key" then
+            mplayer.screens[mplayer.currentScreen].handleKey(mplayer, evd[1], evd[2])
+        elseif ev == "mouse_scroll" then
+            local dir, x, y = table.unpack(evd)
+            mplayer.screens[mplayer.currentScreen].handleScroll(mplayer, dir, x, y)
+        elseif ev == "song_change" then
+            mplayer.statusLineScroll = 0
+        elseif (ev == "mouse_click" or ev == "mouse_drag") and evd[3] == th - 1 then
+            local p = (evd[2] - 1) / tw
+            local song = mplayer.songs[mplayer.currentSong]
+            drive.seek(-drive.getSize())
+            if song ~= nil then
+                drive.seek(song.offset + math.floor(song.length * p))
+            else
+                drive.seek(math.floor(p * drive.getSize()))
+            end
+        elseif (ev == "mouse_click" or ev == "mouse_drag") and evd[3] == 1 then
+            local cx, x = 1, evd[2]
+            for i, screen in ipairs(mplayer.screens) do
+                local caption = " "..i..""..screen.title.." "
+                if x >= cx and x <= (cx + #caption) then
+                    mplayer.currentScreen = i
+                    break
+                end
+                cx = cx + #caption
+            end
+        elseif ev == "mouse_click" or ev == "mouse_drag" then
+            if mplayer.screens[mplayer.currentScreen].handleClick then
+                local butt, x, y = table.unpack(evd)
+                mplayer.screens[mplayer.currentScreen].handleClick(mplayer, x, y)
+            end
+        elseif ev == "term_resize" then
+            tw, th = term.getSize()
+        elseif ev == "tape_removed" then
+            mplayer.songs = {}
+            mplayer.currentSong = 0
+        elseif ev == "tape_inserted" then
+            local seekToAndPlay = nil
+            if drive.getState() == "PLAYING" then
+                seekToAndPlay = drive.getPosition()
+            end
+
+            drive.stop()
+            drive.seek(-drive.getSize())
+            for i = 1, 48 do
+                local offset = read32()
+                local length = read32()
+                local title = drive.read(117)
+                if offset > drive.getSize() or length > drive.getSize() then
+                    mplayer.songs = {
+                        {
+                            title = "NOTE: It's just a regular tape",
+                            offset = drive.getSize() - 10,
+                            length = 10
+                        },
+                        {
+                            title = drive.getLabel(),
+                            offset = 0,
+                            length = drive.getSize() - 10
+                        }
+                    }
+                    for t = 1, drive.getSize(), 6000 * 60 * 5 do
+                        table.insert(mplayer.songs, {
+                            title = "Skip to " .. time2str(t / 6000),
+                            offset = t,
+                            length = 6000 * 60 * 5
+                        })
+                    end
+                    break
+                end
+                title = title:sub(1, title:find("\x00"))
+                if length > 0 and offset > 0 then
+                    mplayer.songs[i] = {
+                        title = title,
+                        offset = offset,
+                        length = length
+                    }
+                end
+            end
+
+            if seekToAndPlay ~= nil then
+                drive.seek(-drive.getSize())
+                drive.seek(seekToAndPlay)
+                drive.play()
+            end
+        elseif ev ~= "timer" then
+            if drive.isDummy then
+                local m = term.redirect(peripheral.wrap("right"))
+                io.write(ev .. " ")
+                pretty.print(pretty.pretty(evd))
+                term.redirect(m)
+            end
+        end
+    end
+end,
+function()
+    while true do
+        mplayer.statusLineScroll = mplayer.statusLineScroll + 1
+        mplayer.screens[2].textScroll = mplayer.screens[2].textScroll + 1
+        os.sleep(0.25)
+    end
+end,
+function()
+    local oldSong = nil
+    local oldDriveState = nil
+    local oldTapeState = nil
+    while true do
+        mplayer.currentSong = 0
+        if drive._tick then drive._tick() end -- dummy mode
+
+        local tapeState = drive.isReady()
+        if tapeState ~= oldTapeState then
+            os.queueEvent(tapeState and "tape_inserted" or "tape_removed")
+            oldTapeState = tapeState
+        end
+
+        local driveState = drive.getState()
+        if driveState ~= oldDriveState then
+            os.queueEvent("drive_state", driveState)
+            oldDriveState = driveState
+        end
+
+        local pos = drive.getPosition()
+        for i, song in ipairs(mplayer.songs) do
+            if pos >= song.offset and pos < (song.offset + song.length) then
+                mplayer.currentSong = i
+            end
+        end
+
+        if oldSong ~= mplayer.currentSong then
+            os.queueEvent("song_change")
+            oldSong = mplayer.currentSong
+        end
+
+        os.sleep(0.1)
+    end
+end
+)
+
+-- cleanup
+term.clear()
+term.setCursorPos(1, 1)
+for i = 1, 16 do
+    local c = math.pow(2, i - 1)
+    term.setPaletteColor(c, term.nativePaletteColor(c))
+end
+term.setBackgroundColor(colors.black)
+term.setTextColor(colors.white)
+if term.current().setTextScale then
+    term.current().setTextScale(1.0)
+end
+print("<tmpc> Goodbye!")

nfpview.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+from argparse import ArgumentParser
+
+colors = {
+  "0": (240, 240, 240),
+  "1": (242, 178,  51),
+  "2": (229, 127, 216),
+  "3": (153, 178, 242),
+  "4": (222, 222, 108),
+  "5": (127, 204,  25),
+  "6": (242, 178, 204),
+  "7": ( 76,  76,  76),
+  "8": (153, 153, 153),
+  "9": ( 76, 153, 178),
+  "a": (178, 102, 229),
+  "b": ( 51, 102, 204),
+  "c": (127, 102,  76),
+  "d": ( 87, 166,  78),
+  "e": (204,  76,  76),
+  "f": ( 17,  17,  17),
+}
+
+color_names = {
+  "0": "white",
+  "1": "orange",
+  "2": "magenta",
+  "3": "lightBlue",
+  "4": "yellow",
+  "5": "lime",
+  "6": "pink",
+  "7": "gray",
+  "8": "lightGray",
+  "9": "cyan",
+  "a": "purple",
+  "b": "blue",
+  "c": "brown",
+  "d": "green",
+  "e": "red",
+  "f": "black",
+}
+
+parser = ArgumentParser(description="CC default image viewer")
+parser.add_argument("filename")
+
+def color(v: str):
+    return tuple(bytes.fromhex(v.lstrip('#')))
+
+
+for k, (r, g, b) in colors.items():
+    parser.add_argument(f"-{k}", type=color, default=(r, g, b),
+                        help="Set color %s" % color_names[k])
+
+args = parser.parse_args()
+
+with open(args.filename, "r") as fp:
+    for line in fp:
+        for char in line.rstrip():
+            if char in colors:
+                print("\x1b[48;2;%d;%d;%dm \x1b[0m" % colors[char], end="")
+            else:
+                print(" ", end="")
+        print()

obcb-cc.lua

@@ -0,0 +1,99 @@
+
+local ws = assert(http.websocket("wss://bitmap-ws.alula.me/"))
+
+function parse_u16(data)
+    local v = table.remove(data, 1)
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 8))
+    return v, data
+end
+
+function parse_u32(data)
+    local v = table.remove(data, 1)
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 8))
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 16))
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 24))
+    return v, data
+end
+
+local chunk_id = 421
+local chunk_state = { 0x48, 0x65, 0x6c, 0x6c, 0x6f }
+
+local function send_chunk_request(chunk)
+    ws.send(string.char(0x10, bit.band(chunk, 0xFF), bit.band(bit.brshift(chunk, 8), 0xFF)), true)
+end
+
+local function send_chunk_subscribe_request(chunk)
+    ws.send(string.char(0x14, bit.band(chunk, 0xFF), bit.band(bit.brshift(chunk, 8), 0xFF)), true)
+end
+
+parallel.waitForAll(function()
+    while true do
+        local data, is_binary = ws.receive()
+        data = { string.byte(data, 1, #data) }
+        local opcode = table.remove(data, 1)
+        if opcode == 0x00 then -- hello
+            ver_major, data = parse_u16(data)
+            ver_minor, data = parse_u16(data)
+            os.queueEvent("obcb:hello", ver_major, ver_minor)
+        elseif opcode == 0x01 then
+            local clients = parse_u32(data)
+            -- TODO: show them somewhere
+            os.queueEvent("obcb:clients", clients)
+        elseif opcode == 0x11 then
+            chunk_index, data = parse_u16(data)
+            if chunk_index == chunk_id then
+                chunk_state = data
+            end
+            os.queueEvent("obcb:update")
+        elseif opcode == 0x12 then
+            offset, chunk = parse_u32(data)
+            local c_id = math.floor(offset / 32768)
+            local b_off = offset % 32768
+            for i = 1, 32 do
+                chunk_state[i + b_off] = chunk[i]
+            end
+            os.queueEvent("obcb:update")
+        else
+            print(table.unpack(data))
+        end
+    end
+end,
+function()
+    local mon = peripheral.wrap("monitor_0")
+    mon.setTextScale(0.5)
+    mon.clear()
+    local tw, th = term.getSize()
+    send_chunk_request(chunk_id)
+    send_chunk_subscribe_request(chunk_id)
+    term.setCursorPos(1, 3)
+    print("Showing chunk " .. chunk_id)
+    print(string.format("Screen: %dx%d", mon.getSize()))
+    while true do
+        local ev = { os.pullEvent() }
+        if ev[1] == "char" and ev[2] == "q" then
+            break
+        elseif ev[1] == "obcb:hello" then
+            term.setCursorPos(1, 1)
+            print(string.format("Hello: obcb v%d.%d", ev[2], ev[3]))
+        elseif ev[1] == "obcb:clients" then
+            term.setCursorPos(1, 2)
+            print("Clients: " .. ev[2])
+        elseif ev[1] == "obcb:update" then
+            for y = 1, 81 do
+                mon.setCursorPos(1, y)
+                local tx = {}
+                local bg = {}
+                local fg = {}
+                for x = 1, 164 do
+                    local i = (y - 1) * 164 + (x - 1)
+                    tx[x] = chunk_state[i * 2 + 1]
+                    fg[x] = string.format("%x", bit.band(chunk_state[i * 2 + 2], 0xF))
+                    bg[x] = string.format("%x", bit.band(bit.brshift(chunk_state[i * 2 + 2], 4), 0xF))
+                end
+                mon.blit(string.char(table.unpack(tx)), table.concat(bg), table.concat(fg))
+            end
+        end
+    end
+end)
+
+ws.close()

runonchange.lua

@@ -0,0 +1,43 @@
+local args = { ... }
+
+local modtimes = {}
+
+if #args == 0 then
+    print("usage: runonchange [files to watch ...] -- program [args...]")
+    return
+end
+
+while #args > 0 do
+    local name = table.remove(args, 1)
+    if name == "--" then break end
+    modtimes[name] = -1
+end
+
+if #args == 0 then
+    printError("No executable was given")
+    return
+end
+
+local curdir = shell.dir()
+
+while true do
+    local shall_run = false
+    for name, modtime in pairs(modtimes) do
+        local path = name:sub(1,1) == "/" and name or (curdir .. "/" .. name)
+        local modtime_new = fs.attributes(path).modified
+        if modtime_new ~= modtime then
+            shall_run = true
+            modtimes[name] = modtime_new
+            print(name .. " was modified")
+        end
+    end
+    if shall_run then
+        local succ, err = pcall(shell.run, table.unpack(args))
+        if succ then
+            print("Process finished successfully")
+        else
+            printError("Process crashed: " .. err)
+        end
+    end
+    os.sleep(0.5)
+end

stream.lua

@@ -1,6 +1,6 @@
 local args = { ... }
 
-local buffer_size = 8192
+local dfpwm = require("cc.audio.dfpwm")
 
 if not http then
     print("no http, check config")
@@ -21,21 +21,35 @@ if not req then
     return
 end
 
-local buffer = { }
-for i = 1, buffer_size do
-    buffer[i] = 0
+local headers = req.getResponseHeaders()
+local length = tonumber(headers["Content-Length"]) or 0
+
+local function decode_s8(data)
+    local buffer = {}
+    for i = 1, #data do
+        local v = string.byte(data, i)
+        if bit32.band(v, 0x80) then
+            v = bit32.bxor(v, 0x7F) - 128
+        end
+        buffer[i] = v
+    end
+    return buffer
 end
 
+local use_dfpwm = ({ args[1]:find("%.dfpwm") })[2] == #args[1]
+
+local decode = use_dfpwm and dfpwm.make_decoder() or decode_s8
+local read_bytes = 0
 while true do
-    local chunk = req.read(buffer_size)
+    local chunk = req.read(16384)
     if not chunk then
         break
     end
-    buffer = {}
-    for i = 1, #chunk do
-        buffer[i] = string.byte(chunk, i) - 128
-    end
+
+    local buffer = decode(chunk)
     while not speaker.playAudio(buffer) do
         os.pullEvent("speaker_audio_empty")
     end
 end
+
+print()

tape-playlist.lua

@@ -0,0 +1,143 @@
+local drive = peripheral.find("tape_drive")
+if not drive then
+    printError("no tape drive found")
+    printError("it's kinda required to play tapes, you know?")
+    return
+end
+
+local running = true
+
+term.setBackgroundColor(colors.black)
+term.clear()
+local screen_w, screen_h = term.getSize()
+local table_of_contents = {}
+
+
+local function read32()
+    local v = 0
+    for i = 1, 4 do
+        local b = drive.read()
+        v = bit32.bor(bit32.lshift(v, 8), b)
+    end
+    return v
+end
+
+local function bytes2time(b)
+    local s = math.floor(b / 6000)
+    if s < 60 then return string.format("%ds", s) end
+    return string.format("%dm, %ds", math.floor(s / 60), s % 60)
+end
+
+local function textProgress(p, c1, c2, fmt, ...)
+    local tw = term.getSize()
+    local str = string.format(fmt, ...)
+    local w1 = math.ceil(p * tw)
+    local w2 = tw - w1
+
+    local bg = term.getBackgroundColor()
+
+    term.setBackgroundColor(c1)
+    term.write(str:sub(1, w1))
+    local rem = w1 - #str
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(c2)
+    term.write(str:sub(w1 + 1, w1 + w2))
+
+    rem = math.min(tw - #str, w2)
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(bg)
+end
+
+
+parallel.waitForAll(
+function()
+    while running do
+        if drive.isReady() then
+            local pos, size = drive.getPosition(), drive.getSize()
+            for i = 1, math.min(screen_h - 2, 48) do
+                term.setCursorPos(1, i)
+                local song = table_of_contents[i]
+                if song then
+                    local is_playing = pos >= song.offset and pos < song.ending
+                    local s = string.format("#%2d %9s %s", i, bytes2time(song.length), song.title)
+                    if is_playing then
+                        local p = (pos - song.offset) / song.length
+                        textProgress(p, colors.lime, colors.lightGray, s)
+                    else
+                        term.setBackgroundColor(i % 2 == 0 and colors.gray or colors.black)
+                        term.clearLine()
+                        term.write(s)
+                    end
+                end
+            end
+
+            term.setCursorPos(1, screen_h)
+            textProgress(pos / size, colors.red, colors.gray, "%8d / %8d [%s]", pos, size, drive.getState())
+        end
+        os.sleep(0.1)
+    end
+end,
+function()
+    while running do
+        local evd = { os.pullEvent() }
+        local ev, evd = table.remove(evd, 1), evd
+
+        if ev == "mouse_click" then
+            local x, y = table.unpack(evd, 2)
+            if drive.isReady() and y <= #table_of_contents then
+                drive.seek(-drive.getSize())
+                drive.seek(table_of_contents[y].offset)
+                drive.play()
+            end
+        elseif ev == "term_resize" then
+            term.setBackgroundColor(colors.black)
+            term.clear()
+            screen_w, screen_h = term.getSize()
+        elseif ev == "tape_present" then
+            table_of_contents = {}
+            term.clear()
+            if evd[1] then
+                drive.stop()
+                drive.seek(-drive.getSize())
+                for i = 1, 48 do
+                    local offset = read32()
+                    local length = read32()
+                    local title = drive.read(117):gsub("\x00", "")
+                    if length > 0 then
+                        table.insert(table_of_contents, {
+                            title = title,
+                            offset = offset,
+                            length = length,
+                            ending = offset + length
+                        })
+                    end
+                end
+            end
+        end
+    end
+end,
+function()
+    local tape_was_present = nil
+    local drive_old_state = nil
+    while running do
+        local tape_present = drive.isReady()
+        if tape_present ~= tape_was_present then
+            os.queueEvent("tape_present", tape_present)
+            tape_was_present = tape_present
+        end
+
+        local drive_state = drive.getState()
+        if drive_old_state ~= drive_state then
+            os.queueEvent("drive_state", drive_state)
+            drive_old_state = drive_state
+        end
+
+        os.sleep(0.25)
+    end
+end)

tape-playlist.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+# x-run: python3 % /mnt/windows/Users/user/Music/vgm/night-in-the-woods/2014-lost-constellation /tmp/lost-constellation.dfpwm
+
+from tempfile import TemporaryDirectory
+from subprocess import Popen, PIPE
+from sys import argv
+from pathlib import Path
+from os.path import splitext
+from math import ceil
+from re import search
+
+DFPWM_ENCODER_EXECUTABLE = "aucmp"
+FFMPEG_EXECUTABLE = "ffmpeg"
+FFPROBE_EXECUTABLE = "ffprobe"
+
+DFPWM_SAMPLE_RATE = 6000
+
+TAPE_SIZES = [ 2, 4, 8, 16, 32, 64, 128 ]
+
+input_folder = Path(argv[1])
+output_file = Path(argv[2])
+
+with TemporaryDirectory(prefix="tapedrive") as tmpdir_str:
+    tmpdir = Path(tmpdir_str)
+
+    filelist: list[Path] = []
+    titles: list[bytes] = []
+    for i, name in enumerate(input_folder.rglob("*.mp3")):
+        if i >= 48:
+            print(f"more than 48 tracks, skipping {name}")
+            continue
+        encoded_file = tmpdir / (splitext(name.name)[0] + ".dfpwm")
+        filelist.append(encoded_file)
+        with encoded_file.open("wb") as fout:
+            with Popen([ FFPROBE_EXECUTABLE, name ], stderr=PIPE) as ffprobe:
+                metadata: str = ffprobe.stderr.read().decode()  # type: ignore
+                if (match := search(r"title\s+: (.*)", metadata)):
+                    titles.append(match.groups()[0].encode("ascii", errors="ignore"))
+                else:
+                    titles.append(splitext(name.name)[0].encode("ascii", errors="ignore"))
+            with Popen([ DFPWM_ENCODER_EXECUTABLE ], stdout=fout, stdin=PIPE) as dfpwm:
+                with Popen([ FFMPEG_EXECUTABLE, "-i", name, "-f", "s8", "-ac", "1",
+                            "-ar", "48k", "-" ], stdout=dfpwm.stdin) as ffmpeg:
+                    ffmpeg.wait()
+
+    offset: int = 6000
+    positions: list[tuple[int, int]] = []
+    for file in filelist:
+        size = ceil(file.stat().st_size / DFPWM_SAMPLE_RATE) * DFPWM_SAMPLE_RATE
+        positions.append((offset, size))
+        offset += size
+
+    with output_file.open("wb") as fout:
+        print("Writing header...")
+        written_bytes: int = 0
+        for i in range(48):
+            name = (titles[i] if i < len(titles) else b"")[:117]
+            pos = positions[i] if i < len(titles) else (0, 0)
+            if i < len(titles):
+                print(f"{i:2d} {pos[0]} + {pos[1]} {name}")
+            written_bytes += fout.write(pos[0].to_bytes(4, "big"))
+            written_bytes += fout.write(pos[1].to_bytes(4, "big"))
+            written_bytes += fout.write(name)
+            written_bytes += fout.write(b"\x00" * (117 - len(name)))
+        if written_bytes != 6000:
+            print(f"!!! expected 6000 bytes to be written in header, but it's {written_bytes}")
+
+        print("Writing files...")
+        for i, (pos, file) in enumerate(zip(positions, filelist)):
+            print(f"Writing {file.name}")
+            if written_bytes != pos[0]:
+                print(f"!!! expected to be at {pos[0]}, rn at {written_bytes}")
+            with file.open("rb") as fin:
+                file_size: int = 0
+                while (chunk := fin.read(DFPWM_SAMPLE_RATE)):
+                    file_size += fout.write(chunk)
+                written_bytes += file_size
+                padding_size = DFPWM_SAMPLE_RATE - (written_bytes % DFPWM_SAMPLE_RATE)
+                written_bytes += fout.write(b"\x00" * padding_size)
+        print("Use any of those tapes to store properly:")
+        for size in filter(lambda sz: sz * DFPWM_SAMPLE_RATE * 60 >= written_bytes, TAPE_SIZES):
+            print(f"{size} minutes ({size * DFPWM_SAMPLE_RATE * 60} bytes, {written_bytes * 100 / (size * DFPWM_SAMPLE_RATE * 60):7.3f}% used)")

tape-rip.lua

@@ -0,0 +1,91 @@
+local args = { ... }
+
+if #args == 0 then
+    print("Usage: tape-rip [-S] [source-drive] [dst-drive]")
+    print("  -S    don't seek to the beginning of destination drive")
+end
+
+local seekToStart = true
+if args[1] == "-S" then
+    seekToStart= false
+    table.remove(args, 1)
+end
+
+local function textProgress(p, c1, c2, fmt, ...)
+    p = math.min(p, 1)
+    local tw = term.getSize()
+    local str = string.format(fmt, ...)
+    local w1 = math.ceil(p * tw)
+    local w2 = tw - w1
+
+    local bg = term.getBackgroundColor()
+
+    term.setBackgroundColor(c1)
+    term.write(str:sub(1, w1))
+    local rem = w1 - #str
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(c2)
+    term.write(str:sub(w1 + 1, w1 + w2))
+
+    rem = math.min(tw - #str, w2)
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(bg)
+end
+
+local src = peripheral.wrap(args[1])
+local dst = peripheral.wrap(args[2])
+
+local failure = false
+if not src then
+    printError("Source drive not found")
+    failure = true
+end
+
+if not dst then
+    printError("Destination drive not found")
+    failure = true
+end
+
+if src and not src.isReady() then
+    printError("Source drive is empty")
+    failure = true
+end
+
+if dst and not dst.isReady() then
+    printError("Destination drive is empty")
+    failure = true
+end
+
+if failure then
+    printError("Some errors occurred, exiting")
+    return
+end
+
+src.seek(-src.getSize())
+if seekToStart then
+    dst.seek(-dst.getSize())
+end
+
+local _, y = term.getCursorPos()
+local i = 0
+while not src.isEnd() do
+    dst.write(src.read(6000 * 30))
+    local pos, sz = src.getPosition(), src.getSize()
+    term.setCursorPos(1, y)
+    term.clearLine()
+    if (i % 256) == 0 then
+        textProgress(pos / sz, colors.green, colors.gray, "%7.3f%% %8d / %8d", pos * 100 / sz, pos, sz)
+        os.sleep(0.01)
+    end
+    i = i + 1
+end
+
+local pos, sz = src.getPosition(), src.getSize()
+textProgress(pos / sz, colors.green, colors.gray, "%7.3f%% %8d / %8d", pos * 100 / sz, pos, sz)
+print()

tapeget.lua

@@ -1,9 +1,70 @@
 local args = { ... }
 
-local tape = peripheral.find("tape_drive")
-if not tape then
-    print("tape where")
-    return
+local seekTo = 0
+local driveName = nil
+if args[1] == "-S" then
+    table.remove(args, 1)
+    seekTo = tonumber(table.remove(args, 1))
+end
+if args[1] == "-D" then
+    table.remove(args, 1)
+    driveName = table.remove(args, 1)
+end
+
+local function n_to_kib(value)
+    return string.format("%6.1f kiB", value / 1024)
+end
+
+local function textProgress(p, c1, c2, fmt, ...)
+    p = math.min(p, 1)
+    local tw = term.getSize()
+    local str = string.format(fmt, ...)
+    local w1 = math.ceil(p * tw)
+    local w2 = tw - w1
+
+    local bg = term.getBackgroundColor()
+
+    term.setBackgroundColor(c1)
+    term.write(str:sub(1, w1))
+    local rem = w1 - #str
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(c2)
+    term.write(str:sub(w1 + 1, w1 + w2))
+
+    rem = math.min(tw - #str, w2)
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(bg)
+end
+
+local tape
+if driveName ~= nil then
+    tape = peripheral.wrap(driveName)
+else
+    local drives = { peripheral.find("tape_drive") }
+    if #drives == 0 then
+        print("Drive where")
+        return
+    elseif #drives ~= 1 then
+        print("More than one drive found:")
+        for i = 1, #drives do
+            print(peripheral.getName(drives[i]))
+        end
+        print("Input drive name:")
+        io.write("> ")
+        tape = peripheral.wrap(read())
+        if not tape then
+            printError("wrong name")
+            return
+        end
+    else
+        tape = drives[1]
+    end
 end
 
 if not http then
@@ -11,40 +72,53 @@ if not http then
     return
 end
 
-tape.stop()
-tape.seek(-tape.getSize())
-tape.stop()
-
-local req = http.get(args[1], {}, true)
+local req, err = http.get(args[1], {}, true)
 if not req then
-    print("oopsie")
+    print("oopsie: "..err)
     return
 end
 
 local headers = req.getResponseHeaders()
-local length = headers["content-length"]
+local length = tonumber(headers["content-length"]) or 1
 
-local function n_to_kib(value)
-    return string.format("%6.1f kiB", value / 1024)
-end
+if length > tape.getSize() then
+    printError("Tape is smaller than the file you're trying to write")
+    printError("Are you sure?")
 
-local written = 1
-local _, y = term.getCursorPos()
-while true do
-    local chunk = req.read()
-    if not chunk then
-        print("EOF")
-        break
-    end
-    tape.write(chunk)
-    written = written + 1
-    if (written % 8192) == 0 then
-        os.sleep(0.01)
-        term.setCursorPos(1, y)
-        term.write(n_to_kib(written) .. " / " .. n_to_kib(length) .. string.format(" %7.3f%%", 100 * written / length))
+    io.write("Write anyways? [y/N]: ")
+    local r = read()
+    if r ~= "y" and r ~= "Y" then
+        return
     end
 end
 
+tape.stop()
+tape.seek(-tape.getSize())
+tape.seek(seekTo)
+tape.stop()
+
+local _, y = term.getCursorPos()
+local written = 0
+
+local i = 1
+while true do
+    local chunk = req.read(256)
+    if not chunk then
+        break
+    end
+    written = written + #chunk
+    tape.write(chunk)
+    if i % 10 == 0 then
+        term.setCursorPos(1, y)
+        term.clearLine()
+        textProgress(written / length, colors.green, colors.gray, "%s / %s", n_to_kib(written), n_to_kib(length))
+        os.sleep(0.01)
+    end
+end
+term.setCursorPos(1, y)
+term.clearLine()
+print("Written "..n_to_kib(written))
+
 tape.stop()
 tape.seek(-tape.getSize())
 tape.stop()

turtos/ctrl.lua

@@ -0,0 +1,71 @@
+local wlan = peripheral.find("modem", function(addr, modem)
+    return modem.isWireless()
+end)
+
+if not wlan then error("no wireless interface") end
+
+wlan.open(9998)
+
+local respondedTurtles = {}
+local keyStates = {}
+
+parallel.waitForAny(
+function()
+    while true do
+        local ev, keycode, repeating = os.pullEvent()
+        if ev == "key" then keyStates[keycode] = true
+        elseif ev == "key_up" then keyStates[keycode] = false
+        end
+
+        if ev == "key" and not repeating then
+            if keycode == keys.up then
+                wlan.transmit(9999, 9998, { _ = "move", dir = "fwd", dig = keyStates[keys.leftShift] })
+            elseif keycode == keys.down then
+                wlan.transmit(9999, 9998, { _ = "move", dir = "bck" })
+            elseif keycode == keys.left then
+                wlan.transmit(9999, 9998, { _ = "move", dir = "rotl" })
+            elseif keycode == keys.right then
+                wlan.transmit(9999, 9998, { _ = "move", dir = "rotr" })
+            elseif keycode == keys.pageUp then
+                wlan.transmit(9999, 9998, { _ = "move", dir = "up", dig = keyStates[keys.leftShift] })
+            elseif keycode == keys.pageDown then
+                wlan.transmit(9999, 9998, { _ = "move", dir = "down", dig = keyStates[keys.leftShift] })
+            end
+        end
+    end
+end,
+
+function()
+    while true do
+        local _, side, chan, rchan, data, dist = os.pullEvent("modem_message")
+        if chan == 9998 and rchan == 9999 then
+            if data._ == "WakeUp" then
+                respondedTurtles[data.from] = { true, "Hello!" }
+            elseif data._ == "Ack" then
+                respondedTurtles[data.from] = { true, "Got it" }
+            elseif data._ == "Error" then
+                respondedTurtles[data.from] = { false, data.error }
+            elseif data._ == "Result" then
+                respondedTurtles[data.from] = { true, data.out}
+            end
+        end
+    end
+end,
+
+function()
+    while true do
+        os.pullEvent()
+        term.clear()
+        local i = 1
+        for id, res in pairs(respondedTurtles) do
+            term.setCursorPos(1, i)
+            term.write(string.format("%5d => ", id))
+            term.setTextColor(res[1] and colors.green or colors.red)
+            term.write(res[1] and "OK " or "ER ")
+            term.write(tostring(res[2]))
+            term.setTextColor(colors.white)
+            i = i + 1
+        end
+    end
+end
+)

turtos/main.lua

@@ -0,0 +1,60 @@
+local wlan = peripheral.find("modem", function(addr, modem)
+    return modem.isWireless()
+end)
+
+if not wlan then error("no wireless interface") end
+
+wlan.open(9999)
+
+local ID = os.getComputerID()
+
+wlan.transmit(9998, 9999, {
+    ["_"] = "WakeUp",
+    ["from"] = ID
+})
+
+parallel.waitForAll(function()
+    while true do
+        local _, side, chan, rchan, data, dist = os.pullEvent("modem_message")
+        if chan == 9999 and rchan == 9998 then
+            if data._ == "move" then
+                wlan.transmit(rchan, chan, { ["_"] = "Ack", ["from"] = ID })
+                if data.tgt == nil or data.tgt == ID then
+                    local out = { false, "Invalid direction: " .. data.dir }
+                    if data.dig then
+                        if data.dir == "fwd" and turtle.detect() then turtle.dig()
+                        elseif data.dir == "down" and turtle.detectDown() then turtle.digDown()
+                        elseif data.dir == "up" and turtle.detectUp() then turtle.digUp()
+                        end
+                    end
+                    if     data.dir == "fwd"  then out = { turtle.forward() }
+                    elseif data.dir == "bck"  then out = { turtle.back() }
+                    elseif data.dir == "up"   then out = { turtle.up() }
+                    elseif data.dir == "down" then out = { turtle.down() }
+                    elseif data.dir == "rotl" then out = { turtle.turnLeft() }
+                    elseif data.dir == "rotr" then out = { turtle.turnRight() }
+                    end
+                    if not out[1] then
+                        wlan.transmit(rchan, chan, {
+                            ["_"] = "Error",
+                            ["from"] = ID,
+                            ["error"] = out[2]
+                        })
+                    else
+                        wlan.transmit(rchan, chan, {
+                            ["_"] = "Result",
+                            ["from"] = ID,
+                            ["out"] = out
+                        })
+                    end
+                end
+            elseif data._ == "shutdown" then
+                wlan.transmit(rchan, chan, { ["_"] = "Ack", ["from"] = ID })
+                os.shutdown()
+            elseif data._ == "reboot" then
+                wlan.transmit(rchan, chan, { ["_"] = "Ack", ["from"] = ID })
+                os.reboot()
+            end
+        end
+    end
+end)

turtos/startup.lua

@@ -0,0 +1,57 @@
+if not turtle then
+    printError("not a turtle")
+    return
+end
+
+local base_path = "https://git.salushnes.solutions/hkc/cc-stuff/raw/branch/master/turtos"
+
+_G._TOS_VER = "N/A"
+local tos_ver_fp = io.open("/.tos-ver", "r")
+if tos_ver_fp then
+    _G._TOS_VER = tos_ver_fp:read("l")
+    tos_ver_fp:close()
+end
+
+local function getFile(url, path)
+    local r, err = http.get(url)
+    io.write("GET " .. path .. " ... ")
+    if not r then
+        print("FAIL: " .. err)
+        return false, err
+    end
+    io.open(path, "w"):write(r.readAll()):close()
+    io.write("OK\n")
+end
+
+
+local req, err = http.get(base_path .. "/update.json")
+if not req then
+    printError("Failed to get update info:", err)
+else
+    local info = textutils.unserializeJSON(req.readAll())
+    req.close()
+
+    print("OTP version: " .. info.ver)
+    print("H/W version: " .. _TOS_VER)
+
+    if info.ver == _TOS_VER then
+        print("Running on latest firmware")
+    else
+        print("Performing an update...")
+        for i = 1, #info.files do
+            local file = info.files[i]
+            term.write(file.dst, "...")
+            if fs.exists(file.dst) then
+                term.write(" [DEL] ...")
+                fs.delete(file.dst)
+            end
+            getFile(base_path .. file.src, file.dst)
+        end
+        print("Writing new version info")
+        io.open("/.tos-ver", "w"):write(info.ver):close()
+        print("Rebooting")
+        return os.reboot()
+    end
+end
+
+shell.run("fg", "main.lua")

turtos/update.json

@@ -0,0 +1,7 @@
+{
+  "ver": "0.0.3",
+  "files": [
+    { "src": "/startup.lua", "dst": "/startup.lua" },
+    { "src": "/main.lua", "dst": "/main.lua" }
+  ]
+}

video.lua

@@ -0,0 +1,275 @@
+local args = { ... }
+local dfpwm = require("cc.audio.dfpwm")
+local ccpi = require("ccpi")
+
+local EV_NONCE = math.floor(0xFFFFFFFF * math.random())
+
+settings.define("video.speaker.left", {
+  description = "Speaker ID for left audio channel",
+  default = peripheral.getName(peripheral.find("speaker")),
+  type = "string"
+})
+
+settings.define("video.speaker.right", {
+  description = "Speaker ID for right audio channel",
+  default = nil,
+  type = "string"
+})
+
+settings.define("video.monitor", {
+  description = "Monitor to draw frames on",
+  default = peripheral.getName(peripheral.find("monitor")),
+  type = "string"
+})
+
+local monitor = peripheral.wrap(settings.get("video.monitor"))
+local speakers = {
+  l = peripheral.wrap(settings.get("video.speaker.left")),
+  r = nil
+}
+local r_spk_id = settings.get("video.speaker.right")
+if r_spk_id then
+  speakers.r = peripheral.wrap(r_spk_id)
+end
+
+local delay = 0
+local loading_concurrency = 8
+local buffer_size = 8192
+local wait_until_input = false
+local n_frames, video_url, audio_url_l, audio_url_r
+
+while args[1] ~= nil and string.sub(args[1], 1, 1) == "-" do
+  local k = table.remove(args, 1):sub(2)
+  if k == "m" or k == "monitor" then
+    monitor = peripheral.wrap(table.remove(args, 1))
+  elseif k == "l" or k == "speaker-left" then
+    speakers.l = peripheral.wrap(table.remove(args, 1))
+  elseif k == "r" or k == "speaker-right" then
+    speakers.r = peripheral.wrap(table.remove(args, 1))
+  elseif k == "d" or k == "delay" then
+    delay = tonumber(table.remove(args, 1))
+  elseif k == "t" or k == "threads" then
+    loading_concurrency = tonumber(table.remove(args, 1))
+  elseif k == "b" or k == "buffer-size" then
+    buffer_size = tonumber(table.remove(args, 1))
+  elseif k == "w" or k == "wait" then
+    wait_until_input = true
+  elseif k == "J" or k == "info-json" then
+    local req = assert(http.get(table.remove(args, 1)))
+    local info = textutils.unserializeJSON(req.readAll())
+    delay = info.frame_time
+    n_frames = info.frame_count
+    video_url = info.video
+    audio_url_l = info.audio.l
+    audio_url_r = info.audio.r
+    req.close()
+  end
+end
+
+if not monitor then
+  printError("No monitor connected or invalid one specified")
+  return
+end
+
+if not speakers.l then
+  printError("No speaker connected or invalid one specified")
+  return
+end
+
+if not n_frames and not video_url and not audio_url_l then
+  if #args < 3 then
+    printError("Usage: video [-w] [-b BUFSZ] [-t THREADS] [-J URL] [-m MONITOR] [-l SPK_L] [-r SPK_R] [-d FRAME_T] <N_FRAMES> <VIDEO_TEMPLATE> <LEFT_CHANNEL> [RIGHT_CHANNEL]")
+    return
+  else
+    n_frames = tonumber(table.remove(args, 1))
+    video_url = table.remove(args, 1)
+    audio_url_l = table.remove(args, 1)
+    audio_url_r = #args > 0 and table.remove(args, 1) or nil
+  end
+end
+
+local mon_w, mon_h = monitor.getSize()
+print(string.format("Using monitor %s (%dx%d)", peripheral.getName(monitor), mon_w, mon_h))
+if speakers.r then
+  print(string.format("Stereo sound: L=%s R=%s", peripheral.getName(speakers.l), peripheral.getName(speakers.r)))
+else
+  print("Mono sound: " .. peripheral.getName(speakers.l))
+end
+
+if not speakers.r and audio_url_r then
+  printError("No right speaker found but right audio channel was specified")
+  printError("Right channel will not be played")
+elseif speakers.r and not audio_url_r then
+  printError("No URL for right channel was specified but right speaker is set")
+  printError("Right speaker will remain silent")
+end
+
+print("\n\n")
+local _, ty = term.getCursorPos()
+local tw, _ = term.getSize()
+
+local function draw_bar(y, c1, c2, p, fmt, ...)
+    local str = string.format(fmt, ...)
+    local w1 = math.ceil(p * tw)
+    local w2 = tw - w1
+
+    term.setCursorPos(1, y)
+    term.setBackgroundColor(c1)
+    term.write(str:sub(1, w1))
+    local rem = w1 - #str
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+
+    term.setBackgroundColor(c2)
+    term.write(str:sub(w1 + 1, w1 + w2))
+
+    rem = math.min(tw - #str, w2)
+    if rem > 0 then
+        term.write(string.rep(" ", rem))
+    end
+end
+
+local function decode_s8(data)
+    local buffer = {}
+    for i = 1, #data do
+        local v = string.byte(data, i)
+        if bit32.band(v, 0x80) then
+            v = bit32.bxor(v, 0x7F) - 128
+        end
+        buffer[i] = v
+    end
+    return buffer
+end
+
+local frames = {}
+local audio_frames = { l = {}, r = {} }
+
+local subthreads = {}
+local dl_channels = {
+  l = assert(http.get(audio_url_l, nil, true)),
+  r = audio_url_r and assert(http.get(audio_url_r, nil, true)) or nil,
+}
+
+local n_audio_samples = math.ceil(dl_channels.l.seek("end") / buffer_size)
+dl_channels.l.seek("set", 0)
+
+table.insert(subthreads, function()
+  local chunk
+  repeat
+    chunk = dl_channels.l.read(buffer_size)
+    table.insert(audio_frames.l, chunk or {})
+    if (#audio_frames.l % 8) == 0 then os.sleep(0) end
+  until not chunk or  #chunk == 0
+end)
+
+if dl_channels.r then
+  table.insert(subthreads, function()
+    local chunk
+    repeat
+      chunk = dl_channels.r.read(buffer_size)
+      table.insert(audio_frames.r, chunk or {})
+      if (#audio_frames.r % 8) == 0 then os.sleep(0) end
+    until not chunk or  #chunk == 0
+  end)
+end
+
+for i = 1, loading_concurrency do
+  table.insert(subthreads, function()
+    for ndx = i, n_frames, loading_concurrency do
+      local req = assert(http.get(string.format(video_url, ndx), nil, true))
+      local img = assert(ccpi.parse(req))
+      frames[ndx] = img
+      req.close()
+    end
+  end)
+end
+
+table.insert(subthreads, function()
+  repeat
+    draw_bar(ty - 3, colors.blue, colors.gray, #frames / n_frames, "Loading video [%5d / %5d]", #frames, n_frames)
+    draw_bar(ty - 2, colors.red, colors.gray, #audio_frames.l / n_audio_samples, "Loading audio [%5d / %5d]", #audio_frames.l, n_audio_samples)
+    os.sleep(0.25)
+  until #frames >= n_frames and #audio_frames.l >= n_audio_samples
+  print()
+end)
+
+local playback_done = false
+
+table.insert(subthreads, function()
+  local tmr = os.startTimer(0.25)
+  while true do
+    local ev = { os.pullEvent() }
+    if ev[1] == "key" and ev[2] == keys.enter then
+      break
+    end
+    term.setCursorPos(1, ty - 1)
+    term.setBackgroundColor(colors.gray)
+    term.clearLine()
+    term.write(string.format("Waiting for frames... (V:%d, A:%d)", #frames, #audio_frames.l))
+    if #frames > 60 and #audio_frames.l >= n_audio_samples and not wait_until_input then
+      break
+    end
+  end
+  os.queueEvent("playback_ready", EV_NONCE)
+end)
+
+table.insert(subthreads, function()
+  local is_dfpwm = ({ audio_url_l:find("%.dfpwm") })[2] == #audio_url_l
+  local decode = use_dfpwm and dfpwm.make_decoder() or decode_s8
+
+  repeat 
+    local _, nonce = os.pullEvent("playback_ready")
+  until nonce == EV_NONCE
+
+  for i = 1, n_audio_samples do
+    local buffer = decode(audio_frames.l[i])
+    while not speakers.l.playAudio(buffer) do
+      os.pullEvent("speaker_audio_empty")
+    end
+  end
+
+  playback_done = true
+end)
+
+table.insert(subthreads, function()
+  if not audio_url_r then return end
+  local is_dfpwm = ({ audio_url_r:find("%.dfpwm") })[2] == #audio_url_r
+  local decode = use_dfpwm and dfpwm.make_decoder() or decode_s8
+
+  repeat 
+    local _, nonce = os.pullEvent("playback_ready")
+  until nonce == EV_NONCE
+
+  for i = 1, n_audio_samples do
+    local buffer = decode(audio_frames.r[i])
+    while not speakers.r.playAudio(buffer) do
+      os.pullEvent("speaker_audio_empty")
+    end
+  end
+  playback_done = true
+end)
+
+table.insert(subthreads, function()
+  repeat 
+    local _, nonce = os.pullEvent("playback_ready")
+  until nonce == EV_NONCE
+  local start_t = os.clock()
+  while not playback_done do
+    local frame = math.floor((os.clock() - start_t) / math.max(0.05, delay))
+    term.setCursorPos(1, ty - 1)
+    term.setBackgroundColor(frame >= #frames and colors.red or colors.gray)
+    term.clearLine()
+    term.write(string.format("Playing frame: %d/%d", frame + 1, #frames))
+    local img = frames[frame + 1]
+    if img ~= nil then
+      local x = math.max(math.floor((mon_w - img.w) / 2), 1)
+      local y = math.max(math.floor((mon_h - img.h) / 2), 1)
+      ccpi.draw(img, x, y, monitor)
+    end
+    os.sleep(delay)
+  end
+end)
+
+parallel.waitForAll(table.unpack(subthreads))
+

videotape.lua

@@ -0,0 +1,27 @@
+local tape = peripheral.find("tape_drive")
+local mon = peripheral.find("monitor")
+
+tape.seek(-tape.getSize())
+mon.setTextScale(1)
+
+local w, h = string.byte(tape.read(2), 1, 2)
+
+local b = ""
+for _ = 1, w do b = b .. "0" end
+local f = b
+
+repeat
+    for y = 1, h do
+        mon.setCursorPos(1, y)
+        local buf = { string.byte(tape.read(w), 1, -1) }
+        local s = "" -- , f, b = "", "", ""
+        for x = 1, w do
+            s = s .. string.char(0x80 + bit32.band(0x7F, buf[x]))
+            -- local inv = bit32.band(0x80, buf[x])
+            -- f = f .. (inv and "f" or "0")
+            -- b = b .. (inv and "0" or "f")
+        end
+        mon.blit(s, f, b)
+    end
+    os.sleep(0.01)
+until tape.isEnd()

wsvpn.c

@@ -0,0 +1,385 @@
+// x-run: ~/scripts/runc.sh % -lmongoose -Wall -Wextra
+#include <mongoose.h>
+#include <netinet/in.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_CLIENTS 256
+#define MAX_OPEN_CHANNELS 128
+#define MAX_PACKET_SIZE 32767
+
+/*
+```c
+// ALL integers are network-endian
+
+struct msg_info { // side: both. safe to ignore
+    uint8_t code; // 0x49, 'I'
+    uint16_t len;
+    char msg[1024]; // $.len bytes sent
+};
+
+struct msg_res_error {
+    uint8_t code; // 0x45, 'E'
+    uint16_t req_id; // request ID that caused that error
+    uint16_t len;
+    char msg[1024]; // $.len bytes sent
+};
+
+struct msg_address { // side: server
+    uint8_t code; // 0x41, 'A'
+    uint8_t size;
+    char name[256]; // $.size long
+};
+
+struct msg_res_success { // side: server
+    uint8_t code; // 0x52, 'R'
+    uint16_t req_id; // request ID we're replying to
+    void *data; // packet-specific
+};
+
+struct msg_transmission { // side: server
+    uint8_t code; // 0x54, 'T'
+    uint16_t channel;
+    uint16_t replyChannel;
+    uint16_t size;
+    void *data;
+};
+
+struct msg_req_open { // side: client
+    uint8_t code; // 0x4f, 'O'
+    uint16_t req_id; // incremental request ID
+    uint16_t channel; // channel to be open
+};
+
+```
+*/
+
+struct client {
+  struct mg_connection *connection;
+  uint16_t open_channels[MAX_OPEN_CHANNELS];
+  int next_open_channel_index;
+  bool receive_all;
+};
+
+struct client clients[MAX_CLIENTS] = { 0 };
+
+static void handle_client(struct mg_connection *connection, int event_type, void *ev_data, void *fn_data);
+static void on_ws_connect(struct mg_connection *connection, struct mg_http_message *message, void *data);
+static void on_ws_message(struct mg_connection *connection, struct mg_ws_message *message, void *data);
+static void on_ws_disconnect(struct mg_connection *connection, void *data);
+
+bool client_is_open(struct client *client, uint16_t channel);
+static void modem_open(struct client *client, uint16_t request_id, uint16_t channel);
+static void modem_isOpen(struct client *client, uint16_t request_id, uint16_t channel);
+static void modem_close(struct client *client, uint16_t request_id, uint16_t channel);
+static void modem_closeAll(struct client *client, uint16_t request_id);
+static void modem_transmit(struct client *client, uint16_t request_id, uint16_t channel, uint16_t reply_channel, void *data, uint16_t size);
+
+struct metrics {
+  uint64_t sent_bytes;
+  uint64_t sent_messages;
+  uint64_t received_bytes;
+  uint64_t received_messages;
+  uint64_t errors;
+
+  uint64_t method_calls[5];
+} metrics = { 0 };
+
+const char method_names[5][8] = {
+  "open", "isOpen", "close", "closeAll", "transmit"
+};
+
+int main(void) {
+  const char *address = "ws://0.0.0.0:8667";
+  struct mg_mgr manager;
+  mg_mgr_init(&manager);
+  mg_http_listen(&manager, address, handle_client, NULL);
+  printf("Listening on %s\n", address);
+  while (1) mg_mgr_poll(&manager, 1000);
+  mg_mgr_free(&manager);
+}
+
+static void handle_client(struct mg_connection *connection, int event_type, void *event_data, void *fn_data) {
+  if (event_type == MG_EV_OPEN) {
+    if (connection->rem.port == 0) return;
+    memset(connection->data, 0, 32);
+  } else if (event_type == MG_EV_HTTP_MSG) {
+    struct mg_http_message *http_message = (struct mg_http_message *) event_data;
+    if (mg_http_match_uri(http_message, "/open")) {
+      mg_ws_upgrade(connection, http_message, NULL);
+    } else if (mg_http_match_uri(http_message, "/metrics")) {
+      mg_printf(connection, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
+      mg_http_printf_chunk(connection, "# HELP ws_bytes_sent_total Number of bytes sent to clients\n");
+      mg_http_printf_chunk(connection, "# TYPE ws_bytes_sent_total counter\n");
+      mg_http_printf_chunk(connection, "ws_bytes_sent_total %ld\n", metrics.sent_bytes);
+      mg_http_printf_chunk(connection, "# HELP ws_bytes_received_total Number of bytes received to clients\n");
+      mg_http_printf_chunk(connection, "# TYPE ws_bytes_received_total counter\n");
+      mg_http_printf_chunk(connection, "ws_bytes_received_total %ld\n", metrics.received_bytes);
+
+      mg_http_printf_chunk(connection, "# HELP ws_messages_sent_total Number of messages sent to clients\n");
+      mg_http_printf_chunk(connection, "# TYPE ws_messages_sent_total counter\n");
+      mg_http_printf_chunk(connection, "ws_messages_sent_total %ld\n", metrics.sent_messages);
+      mg_http_printf_chunk(connection, "# HELP ws_messages_received_total Number of messages received to clients\n");
+      mg_http_printf_chunk(connection, "# TYPE ws_messages_received_total counter\n");
+      mg_http_printf_chunk(connection, "ws_messages_received_total %ld\n", metrics.received_messages);
+
+      mg_http_printf_chunk(connection, "# HELP ws_clients Number of active websocket clients\n");
+      mg_http_printf_chunk(connection, "# TYPE ws_clients gauge\n");
+      {
+        int n = 0;
+        for (struct mg_connection *conn = connection->mgr->conns; conn != NULL; conn = conn->next) {
+          if (conn->is_websocket) { n++; }
+        }
+        mg_http_printf_chunk(connection, "ws_clients %d\n", n);
+      }
+
+      mg_http_printf_chunk(connection, "# HELP method_calls Times each method was called\n");
+      mg_http_printf_chunk(connection, "# TYPE method_calls counter\n");
+      for (int i = 0; i < 5; i++) {
+        mg_http_printf_chunk(connection, "method_calls{method=\"%s\"} %ld\n", method_names[i], metrics.method_calls[i]);
+      }
+
+      mg_http_printf_chunk(connection, "");
+    } else {
+      mg_http_reply(connection, 404, "", "uwu");
+    }
+  } else if (event_type == MG_EV_WS_OPEN) {
+    struct mg_http_message *http_message = (struct mg_http_message *) event_data;
+    on_ws_connect(connection, http_message, fn_data);
+  } else if (event_type == MG_EV_WS_MSG) {
+    struct mg_ws_message *ws_message = (struct mg_ws_message *)event_data;
+    on_ws_message(connection, ws_message, fn_data);
+  } else if (event_type == MG_EV_CLOSE) {
+    if (connection->is_websocket) {
+      on_ws_disconnect(connection, fn_data);
+    }
+  }
+}
+
+void ws_send_error(struct client *client, uint16_t request_id, const char *fmt, ...) {
+  static char buffer[1024];
+  memset(buffer, 0, 1024);
+
+  va_list args;
+  va_start(args, fmt);
+  int text_size = vsnprintf(&buffer[5], 1019, fmt, args);
+  va_end(args);
+  if (text_size < 0) return;
+
+  buffer[0] = 'E';
+  buffer[1] = (request_id >> 8) & 0xFF;
+  buffer[2] = request_id & 0xFF;
+  buffer[3] = (text_size >> 8) & 0xFF;
+  buffer[4] = text_size & 0xFF;
+
+  metrics.sent_bytes += 5 + text_size;
+  metrics.sent_messages++;
+  metrics.errors++;
+  mg_ws_send(client->connection, buffer, 5 + text_size, WEBSOCKET_OP_BINARY);
+}
+
+void ws_send_info(struct client *client, const char *fmt, ...) {
+  static char buffer[1024];
+  memset(buffer, 0, 1024);
+
+  va_list args;
+  va_start(args, fmt);
+  int text_size = vsnprintf(&buffer[3], 1021, fmt, args);
+  va_end(args);
+  if (text_size < 0) return;
+
+  buffer[0] = 'I';
+  buffer[1] = (text_size >> 8) & 0xFF;
+  buffer[2] = text_size & 0xFF;
+
+  metrics.sent_bytes += 3 + text_size;
+  metrics.sent_messages++;
+  mg_ws_send(client->connection, buffer, 3 + text_size, WEBSOCKET_OP_BINARY);
+}
+
+void ws_respond(struct client *client, uint16_t request_id, void *data, uint32_t size) {
+  static char buffer[MAX_PACKET_SIZE];
+  assert(size < MAX_PACKET_SIZE);
+  buffer[0] = 'R';
+  buffer[1] = (request_id >> 8) & 0xFF;
+  buffer[2] = request_id & 0xFF;
+  if (size != 0) memcpy(&buffer[3], data, size);
+  metrics.sent_bytes += 3 + size;
+  metrics.sent_messages++;
+  mg_ws_send(client->connection, buffer, size + 3, WEBSOCKET_OP_BINARY);
+}
+
+static void on_ws_connect(struct mg_connection *connection, struct mg_http_message *message, void *data) {
+  (void)message;
+  (void)data;
+  struct client *client = malloc(sizeof(struct client));
+  memcpy(&connection->data[0], &client, sizeof(struct client *));
+  client->connection = connection;
+
+  static char buffer[256];
+  buffer[0] = 'A';
+  buffer[1] = snprintf(&buffer[2], 250, "wsvpn_%ld", connection->id);
+  metrics.sent_bytes += 2 + buffer[1];
+  metrics.sent_messages++;
+  mg_ws_send(connection, buffer, 2 + buffer[1], WEBSOCKET_OP_BINARY);
+}
+
+static void on_ws_message(struct mg_connection *connection, struct mg_ws_message *message, void *data) {
+  (void)data;
+
+  if ((message->flags & 15) != WEBSOCKET_OP_BINARY) {
+    const char *err_str = "This server only works in binary mode. Sorry!";
+    mg_ws_send(connection, err_str, strlen(err_str), WEBSOCKET_OP_TEXT);
+    connection->is_draining = 1;
+    return;
+  }
+
+  struct client *client = *(struct client **)&connection->data[0];
+  assert(client->connection == connection);
+
+  metrics.received_bytes += message->data.len;
+  metrics.received_messages++;
+
+  if (message->data.len == 0) return;
+
+  uint16_t request_id = ntohs(*(uint16_t*)&message->data.ptr[1]);
+
+  switch (message->data.ptr[0]) {
+    case 'I': // info. We can safely ignore that message
+      break;
+    case 'O': // open
+      {
+        metrics.method_calls[0]++;
+        uint16_t channel = ntohs(*(uint16_t*)&message->data.ptr[3]);
+        printf("%p[%04x] modem.open(%d)\n", (void*)client, request_id, channel);
+        modem_open(client, request_id, channel);
+      }
+      return;
+    case 'o': // isOpen
+      {
+        metrics.method_calls[1]++;
+        uint16_t channel = ntohs(*(uint16_t*)&message->data.ptr[3]);
+        printf("%p[%04x] modem.isOpen(%d)\n", (void*)client, request_id, channel);
+        modem_isOpen(client, request_id, channel);
+      }
+      return;
+    case 'c': // close
+      {
+        metrics.method_calls[2]++;
+        uint16_t channel = ntohs(*(uint16_t*)&message->data.ptr[3]);
+        printf("%p[%04x] modem.close(%d)\n", (void*)client, request_id, channel);
+        modem_close(client, request_id, channel);
+      }
+      return;
+    case 'C': // closeAll
+      {
+        metrics.method_calls[3]++;
+        printf("%p[%04x] modem.closeAll()\n", (void*)client, request_id);
+        modem_closeAll(client, request_id);
+      }
+      return;
+    case 'T': // transmit
+      {
+        metrics.method_calls[4]++;
+        uint16_t channel = ntohs(*(uint16_t*)&message->data.ptr[3]);
+        uint16_t reply_channel = ntohs(*(uint16_t*)&message->data.ptr[5]);
+        uint16_t data_length = ntohs(*(uint16_t*)&message->data.ptr[7]);
+        modem_transmit(client, request_id, channel, reply_channel, (void*)&message->data.ptr[9], data_length);
+      }
+      return;
+    default:
+      ws_send_error(client, request_id, "Unknown opcode: 0x%02x", message->data.ptr[0]);
+      connection->is_draining = 1;
+      return;
+  }
+}
+
+static void on_ws_disconnect(struct mg_connection *connection, void *data) {
+  (void)data;
+
+  struct client *client = *(struct client **)&connection->data[0];
+  if (client->connection == connection) {
+    free(client);
+  }
+}
+
+
+static void modem_open(struct client *client, uint16_t request_id, uint16_t channel) {
+  if (client_is_open(client, channel)) {
+    ws_respond(client, request_id, NULL, 0);
+  }
+
+  if (client->next_open_channel_index == MAX_OPEN_CHANNELS) {
+    ws_send_error(client, request_id, "Too many open channels");
+    return;
+  }
+
+  client->open_channels[client->next_open_channel_index] = channel;
+  client->next_open_channel_index++;
+  ws_respond(client, request_id, NULL, 0);
+}
+
+static void modem_isOpen(struct client *client, uint16_t request_id, uint16_t channel) {
+  unsigned char is_open = client_is_open(client, channel) ? 42 : 0;
+  ws_respond(client, request_id, &is_open, 1);
+}
+
+static void modem_close(struct client *client, uint16_t request_id, uint16_t channel) {
+  for (int i = 0; i < client->next_open_channel_index; i++) {
+    if (client->open_channels[i] == channel) {
+      client->open_channels[i] = client->open_channels[client->next_open_channel_index - 1];
+      client->next_open_channel_index--;
+      break;
+    }
+  }
+  ws_respond(client, request_id, NULL, 0);
+}
+
+static void modem_closeAll(struct client *client, uint16_t request_id) {
+  client->next_open_channel_index = 0;
+  memset(client->open_channels, 0, sizeof(uint16_t) * MAX_OPEN_CHANNELS);
+  ws_respond(client, request_id, NULL, 0);
+}
+
+static void modem_transmit(struct client *client, uint16_t request_id, uint16_t channel, uint16_t reply_channel, void *data, uint16_t size) {
+  static uint8_t buffer[MAX_PACKET_SIZE + 7];
+
+  if (size > MAX_PACKET_SIZE) {
+    ws_send_error(client, request_id, "Packet too big: %d > %d", size, MAX_PACKET_SIZE);
+    return;
+  }
+
+  buffer[0] = 'T';
+  buffer[1] = (channel >> 8) & 0xFF;
+  buffer[2] = channel & 0xFF;
+  buffer[3] = (reply_channel >> 8) & 0xFF;
+  buffer[4] = reply_channel & 0xFF;
+  buffer[5] = (size >> 8) & 0xFF;
+  buffer[6] = size & 0xFF;
+  memcpy(&buffer[7], data, size);
+
+  for (struct mg_connection *conn = client->connection->mgr->conns; conn != NULL; conn = conn->next) {
+    if (conn->is_websocket) {
+      struct client *other_client = *(struct client **)&conn->data[0];
+      if (other_client->connection == conn && other_client->connection != client->connection) {
+        if (client_is_open(other_client, channel)) {
+          metrics.sent_bytes += size + 7;
+          metrics.sent_messages++;
+          mg_ws_send(other_client->connection, buffer, size + 7, WEBSOCKET_OP_BINARY);
+        }
+      }
+    }
+  }
+  ws_respond(client, request_id, NULL, 0);
+}
+
+bool client_is_open(struct client *client, uint16_t channel) {
+  for (int i = 0; i < client->next_open_channel_index; i++) {
+    if (client->open_channels[i] == channel) {
+      return true;
+    }
+  }
+  return false;
+}

wsvpn.lua

@@ -0,0 +1,154 @@
+local expect = require("cc.expect")
+
+local WSModem = {
+  open = function(self, channel)
+    expect.expect(1, channel, "number")
+    expect.range(channel, 0, 65535)
+    self._request(0x4f, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel)
+      })
+  end,
+  isOpen = function(self, channel)
+    expect.expect(1, channel, "number")
+    expect.range(channel, 0, 65535)
+    return self._request(0x6f, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel)
+      })[1] ~= 0
+  end,
+  close = function(self, channel)
+    expect.expect(1, channel, "number")
+    expect.range(channel, 0, 65535)
+    self._request(0x63, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel)
+      })
+  end,
+  closeAll = function(self)
+    self._request(0x43)
+  end,
+  transmit = function(self, channel, replyChannel, data)
+    expect.expect(1, channel, "number")
+    expect.expect(2, replyChannel, "number")
+    expect.expect(3, data, "nil", "string", "number", "table")
+    expect.range(channel, 0, 65535)
+    expect.range(replyChannel, 0, 65535)
+
+    local serialized = textutils.serializeJSON(data)
+    expect.range(#serialized, 0, 65535)
+    serialized = { serialized:byte(1, 65536) }
+    self._request(0x54, {
+        bit.band(0xFF, bit.brshift(channel, 8)),
+        bit.band(0xFF, channel),
+        bit.band(0xFF, bit.brshift(replyChannel, 8)),
+        bit.band(0xFF, replyChannel),
+        bit.band(0xFF, bit.brshift(#serialized, 8)),
+        bit.band(0xFF, #serialized),
+        table.unpack(serialized, 1, #serialized)
+      })
+  end,
+  isWireless = function(self) return true end,
+  run = function(self)
+    while true do
+      local data, binary = self._socket.receive()
+      if not data then return true end
+      if binary == false then return false, "Not a binary message" end
+      data = { string.byte(data, 1, #data) }
+      local opcode = table.remove(data, 1)
+      if opcode == 0x49 then -- info
+        local len, msg = self._read_u16ne(data)
+        msg = string.char(table.unpack(msg))
+        os.queueEvent("wsvpn:info", msg)
+      elseif opcode == 0x41 then -- Set address/side
+        local len = table.remove(data, 1)
+        self.side = string.char(table.unpack(data, 1, len))
+      elseif opcode == 0x45 then -- Error
+        local request_id, error_length
+        request_id, data = self._read_u16ne(data)
+        error_length, data = self._read_u16ne(data)
+        local message = string.char(table.unpack(data, 1, error_length))
+        os.queueEvent("wsvpn:response", false, request_id, message)
+      elseif opcode == 0x52 then -- Response
+        local request_id, response = self._read_u16ne(data)
+        os.queueEvent("wsvpn:response", true, request_id, response)
+      elseif opcode == 0x54 then -- Transmission
+        local channel, replyChannel, dataSize, packet
+        channel, data = self._read_u16ne(data)
+        replyChannel, data = self._read_u16ne(data)
+        dataSize, packet = self._read_u16ne(data)
+        os.queueEvent("modem_message", self.side or "wsmodem_0", channel, replyChannel, textutils.unserializeJSON(string.char(table.unpack(data, 1, dataSize))), nil)
+      else
+        return false, string.format("Invalid opcode 0x%02x", opcode)
+      end
+      os.sleep(0)
+    end
+  end,
+
+  -- low-level part
+
+  _read_u16ne = function(self, data)
+    local v = bit.blshift(table.remove(data, 1), 8)
+    v = bit.bor(v, table.remove(data, 1))
+    return v, data
+  end,
+
+  _wait_response = function(self, request_id)
+    while true do
+      local ev, status, id, data = os.pullEvent("wsvpn:response")
+      if ev == "wsvpn:response" and id == request_id then
+        return status, data
+      end
+    end
+  end,
+
+  _request = function(self, opcode, data)
+    local request_id = self._get_id()
+    self._socket.send(
+      string.char(
+        opcode,
+        bit.band(0xFF, bit.brshift(request_id, 8)),
+        bit.band(0xFF, request_id),
+        table.unpack(data or {})
+        ),
+      true
+      )
+    local status, response = self._wait_response(request_id)
+    if not status then
+      error(response)
+    end
+    return response
+  end,
+
+  _get_id = function(self)
+    self._req_id = bit.band(0xFFFF, self._req_id + 1)
+    return self._req_id
+  end,
+
+  _send_text = function(self, code, fmt, ...)
+    local msg = { fmt:format(...):byte(1, 1020) }
+    self._socket.send(
+      string.char(
+        code,
+        bit.band(0xFF, bit.brshift(#msg, 8)),
+        bit.band(0xFF, #msg),
+        table.unpack(msg, 1, #msg)
+      ),
+      true
+    )
+  end,
+
+  _init = function(self)
+    self._send_text(0x49, "Hello! I'm computer %d", os.getComputerID())
+  end,
+}
+
+return function(addr)
+  local ws = assert(http.websocket(addr))
+  local sock = setmetatable({ _socket = ws, _req_id = 0, side = "wsmodem_unknown" }, { __index = WSModem })
+  for name, method in pairs(WSModem) do
+    sock[name] = function(...) return method(sock, ...) end
+  end
+  sock._init()
+  return sock
+end