Finish up (maybe) the new compression scheme.

inst/bdivide/compress.lua

@@ -41,8 +41,9 @@ for i = 0, 127 do
  end
 end
 
-local function preproc(blk, p)
+local function preprocWithPadding(blk, p)
  local out = ""
+ local needsPadding = false
  while blk ~= "" do
   p(blk)
   local len = math.min(preprocMaxLen, #blk)
@@ -50,6 +51,7 @@ local function preproc(blk, p)
    local seg = blk:sub(1, len)
    if preprocParts[seg] then
     out = out .. preprocParts[seg]
+    needsPadding = #preprocParts[seg] < 2
     blk = blk:sub(#seg + 1)
     break
    end
@@ -57,68 +59,27 @@ local function preproc(blk, p)
   end
   assert(len ~= 0)
  end
- return out
-end
-
--- BDIVIDE r5 edition
--- Algorithm simplified for smaller implementation and potentially better compression
--- format:
--- 0-127 for constants
--- <128 + (length - 4)>, <position high>, <position low>
--- Position is where in the window it was found, minus 1.
--- windowSize must be the same between the encoder and decoder,
---  and is the amount of data preserved after cropping.
-local function bdivide(blk, p)
- local out = ""
-
- local windowSize = 0x10000
- local windowData = ("\x00"):rep(windowSize)
-
- while blk ~= "" do
-  p(blk)
-  local bestData = blk:sub(1, 1)
-  local bestRes = bestData
-  for lm = 0, 127 do
-   local al = lm + 4
-   local pfx = blk:sub(1, al)
-   if #pfx ~= al then
-    break
-   end
-   local p = windowData:find(pfx, 1, true)
-   if not p then
-    break
-   end
-   local pm = p - 1
-   local thirdByte = pm % 256
-   -- anti ']'-corruption helper
-   if thirdByte ~= 93 then
-    bestData = string.char(128 + lm, math.floor(pm / 256), thirdByte)
-    bestRes = pfx
-   end
-  end
-  -- ok, encode!
-  out = out .. bestData
-  -- crop window
-  windowData = (windowData .. bestRes):sub(-windowSize)
-  blk = blk:sub(#bestRes + 1)
+ -- This needsPadding bit is just sort of quickly added in
+ --  to keep this part properly maintained
+ --  even though it might never get used
+ if needsPadding then
+  return out .. "\x00"
  end
  return out
 end
 
+local bdCore = require("bdivide.core")
+
 return function (data, lexCrunch)
  io.stderr:write("preproc: ")
  local pi = frw.progress()
  local function p(b)
   pi(1 - (#b / #data))
  end
- data = preproc(data, p)
+ data = preprocWithPadding(data, p)
  io.stderr:write("\nbdivide: ")
  pi = frw.progress()
- data = bdivide(data, p)
+ data = bdCore.bdividePad(bdCore.bdivide(data, p))
  io.stderr:write("\n")
- -- These are used to pad the stream to flush the pipeline.
- -- It's cheaper than the required code.
- -- 1 byte of buffer for preproc,
- -- 2 bytes of buffer for bdivide.
- return lexCrunch.process(frw.read("bdivide/instdeco.lua"), {}), data .. ("\x00"):rep(3)
+ return lexCrunch.process(frw.read("bdivide/instdeco.lua"), {}), data
 end

inst/bdivide/core.lua

@@ -0,0 +1,72 @@
+-- This is released into the public domain.
+-- No warranty is provided, implied or otherwise.
+
+-- BDIVIDE r5 edition
+-- Algorithm simplified for smaller implementation and potentially better compression
+-- format:
+-- 0-127 for constants
+-- <128 + (length - 4)>, <position high>, <position low>
+-- Position is where in the window it was found, minus 1.
+-- windowSize must be the same between the encoder and decoder,
+--  and is the amount of data preserved after cropping.
+
+local bdivCore = {}
+
+function bdivCore.bdivide(blk, p)
+ local out = ""
+
+ local windowSize = 0x10000
+ local windowData = ("\x00"):rep(windowSize)
+
+ while blk ~= "" do
+  p(blk)
+  local bestData = blk:sub(1, 1)
+  assert(blk:byte() < 128, "BDIVIDE does not handle 8-bit data")
+  local bestRes = bestData
+  for lm = 0, 127 do
+   local al = lm + 4
+   local pfx = blk:sub(1, al)
+   if #pfx ~= al then
+    break
+   end
+   local p = windowData:find(pfx, 1, true)
+   if not p then
+    break
+   end
+   local pm = p - 1
+   local thirdByte = pm % 256
+   bestData = string.char(128 + lm, math.floor(pm / 256), thirdByte)
+   bestRes = pfx
+  end
+  -- ok, encode!
+  out = out .. bestData
+  -- crop window
+  windowData = (windowData .. bestRes):sub(-windowSize)
+  blk = blk:sub(#bestRes + 1)
+ end
+ return out
+end
+
+-- Adds padding if required
+function bdivCore.bdividePad(data)
+ local i = 1
+ -- Basically, if it ends on a literal,
+ --  then the literal won't get read without two padding bytes.
+ -- Otherwise (including if no data) it's fine.
+ local needsPadding = false
+ while i <= #data do
+  if data:byte(i) > 127 then
+   i = i + 3
+   needsPadding = false
+  else
+   i = i + 1
+   needsPadding = true
+  end
+ end
+ if needsPadding then
+  return data .. "\x00\x00"
+ end
+ return data
+end
+
+return bdivCore

inst/bdivide/instdeco.lua

@@ -34,29 +34,31 @@ function $bdPP(x, y)
  return string.char(("enart"):byte(x % 5 + 1), ("ndtelh"):byte((x - x % 5) / 5 + 1)), 2
 end
 
-function $engineInput($a0)
- $bdBDBuffer = $bdBDBuffer .. $a0
+${
+function $engineInput($L|lData)
+ $bdBDBuffer = $bdBDBuffer .. $lData
  while #$bdBDBuffer > 2 do
-  $a0 = $bdBDBuffer:byte()
-  if $a0 < 128 then
-   $a0 = $bdBDBuffer:sub(1, 1)
+  $lData = $bdBDBuffer:byte()
+  if $lData < 128 then
+   $lData = $bdBDBuffer:sub(1, 1)
    $bdBDBuffer = $bdBDBuffer:sub(2)
   else
-   $NT|bdBDPtr
-   $bdBDPtr = $bdBDBuffer:byte(2) * 256 + $bdBDBuffer:byte(3) + 1
-   $a0 = $bdBDWindow:sub($bdBDPtr, $bdBDPtr + $a0 - 125)
+   ${
+   $L|bdBDPtr = $bdBDBuffer:byte(2) * 256 + $bdBDBuffer:byte(3) + 1
+   $lData = $bdBDWindow:sub($bdBDPtr, $bdBDPtr + $lData - 125)
    $bdBDBuffer = $bdBDBuffer:sub(4)
-   $DT|bdBDPtr
+   $}
   end
-  $bdPPBuffer = $bdPPBuffer .. $a0
-  $bdBDWindow = ($bdBDWindow .. $a0):sub(-2^16)
+  $bdPPBuffer = $bdPPBuffer .. $lData
+  $bdBDWindow = ($bdBDWindow .. $lData):sub(-2^16)
   while #$bdPPBuffer > 1 do
-   $NT|bdPPAdv
-   $a0, $bdPPAdv = $bdPP($bdPPBuffer:byte(), $bdPPBuffer:byte(2))
+   ${
+   $lData, $L|bdPPAdv = $bdPP($bdPPBuffer:byte(), $bdPPBuffer:byte(2))
    $bdPPBuffer = $bdPPBuffer:sub($bdPPAdv)
-   $DT|bdPPAdv
-   $engineOutput($a0)
+   $}
+   $engineOutput($lData)
   end
  end
 end
+$}
 

inst/bdvlite/compress.lua

@@ -0,0 +1,18 @@
+-- This is released into the public domain.
+-- No warranty is provided, implied or otherwise.
+
+local frw = require("libs.frw")
+
+local bdCore = require("bdivide.core")
+
+return function (data, lexCrunch)
+ io.stderr:write("\nbdivide: ")
+ local pi = frw.progress()
+ local function p(b)
+  pi(1 - (#b / #data))
+ end
+ data = bdCore.bdividePad(bdCore.bdivide(data, p))
+ io.stderr:write("\n")
+ return lexCrunch.process(frw.read("bdvlite/instdeco.lua"), {}), data
+end
+

inst/bdvlite/core.lua

@@ -0,0 +1,72 @@
+-- This is released into the public domain.
+-- No warranty is provided, implied or otherwise.
+
+-- BDIVIDE r5 edition
+-- Algorithm simplified for smaller implementation and potentially better compression
+-- format:
+-- 0-127 for constants
+-- <128 + (length - 4)>, <position high>, <position low>
+-- Position is where in the window it was found, minus 1.
+-- windowSize must be the same between the encoder and decoder,
+--  and is the amount of data preserved after cropping.
+
+local bdivCore = {}
+
+function bdivCore.bdivide(blk, p)
+ local out = ""
+
+ local windowSize = 0x10000
+ local windowData = ("\x00"):rep(windowSize)
+
+ while blk ~= "" do
+  p(blk)
+  local bestData = blk:sub(1, 1)
+  assert(blk:byte() < 128, "BDIVIDE does not handle 8-bit data")
+  local bestRes = bestData
+  for lm = 0, 127 do
+   local al = lm + 4
+   local pfx = blk:sub(1, al)
+   if #pfx ~= al then
+    break
+   end
+   local p = windowData:find(pfx, 1, true)
+   if not p then
+    break
+   end
+   local pm = p - 1
+   local thirdByte = pm % 256
+   bestData = string.char(128 + lm, math.floor(pm / 256), thirdByte)
+   bestRes = pfx
+  end
+  -- ok, encode!
+  out = out .. bestData
+  -- crop window
+  windowData = (windowData .. bestRes):sub(-windowSize)
+  blk = blk:sub(#bestRes + 1)
+ end
+ return out
+end
+
+-- Adds padding if required
+function bdivCore.bdividePad(data)
+ local i = 1
+ -- Basically, if it ends on a literal,
+ --  then the literal won't get read without two padding bytes.
+ -- Otherwise (including if no data) it's fine.
+ local needsPadding = false
+ while i <= #data do
+  if data:byte(i) > 127 then
+   i = i + 3
+   needsPadding = false
+  else
+   i = i + 1
+   needsPadding = true
+  end
+ end
+ if needsPadding then
+  return data .. "\x00\x00"
+ end
+ return data
+end
+
+return bdivCore

inst/bdvlite/instdeco.lua

@@ -0,0 +1,30 @@
+-- This is released into the public domain.
+-- No warranty is provided, implied or otherwise.
+
+-- BDIVIDE (r5 edition)
+-- decompression engine used to decompress DEFLATE decompression engine
+
+$bdBDBuffer = ""
+$bdBDWindow = ("\x00"):rep(2^16)
+
+${
+function $engineInput($L|lData)
+ $bdBDBuffer = $bdBDBuffer .. $lData
+ while #$bdBDBuffer > 2 do
+  $lData = $bdBDBuffer:byte()
+  if $lData < 128 then
+   $lData = $bdBDBuffer:sub(1, 1)
+   $bdBDBuffer = $bdBDBuffer:sub(2)
+  else
+   ${
+   $L|bdBDPtr = $bdBDBuffer:byte(2) * 256 + $bdBDBuffer:byte(3) + 1
+   $lData = $bdBDWindow:sub($bdBDPtr, $bdBDPtr + $lData - 125)
+   $bdBDBuffer = $bdBDBuffer:sub(4)
+   $}
+  end
+  $bdBDWindow = ($bdBDWindow .. $lData):sub(-2^16)
+  $engineOutput($lData)
+ end
+end
+$}
+

inst/build.lua

@@ -2,46 +2,74 @@
 -- No warranty is provided, implied or otherwise.
 
 -- KittenOS NEO Installer Generator --
-local alg, tarName, cid = ...
-cid = (cid or "UNKNOWN"):sub(1, 7)
+local args = {...}
+
+local cid = args[1]
+local tarName = args[2]
+local algorithmsInReverseOrder = {}
+for i = 3, #args do
+ table.insert(algorithmsInReverseOrder, 1, args[i])
+end
 
 local u = require("libs.frw")
 
-local algImpl = require(alg .. ".compress")
-
 local instSize = 0
 local function put(data)
  io.write(data)
  instSize = instSize + #data
 end
 
--- TAR File --
-local tarData = u.read(tarName)
-local tarSectors = math.floor(#tarData / 512)
-
 -- Installer Lexcrunch Context --
 local lexCrunch = require("libs.lexcrunch")()
 
+-- Installer Core --
+
+-- installerFinalized:
+--  Stuff that's already finished and put at the end of RISM. Prepend to this.
+-- installerPayload / installerProgramLength:
+--  The next-outer chunk that hasn't been written to the end of RISM
+--   as the compression scheme (if one) has not been applied yet.
+--  Really, installerProgramLength is only necessary because of the innermost chunk,
+--   as that chunk has the TAR; additional data that's part of the same effective compression block,
+--   but requires the program length to avoid it.
+local installerPayload
+local installerProgramLength
+local installerFinalized = ""
+
+do
+ local tarData = u.read(tarName)
+ local tarSectors = math.floor(#tarData / 512)
  local installerCore = lexCrunch.process(u.read("instcore.lua"), {["$$SECTORS"] = tostring(tarSectors)})
-local installerHead = lexCrunch.process(u.read("insthead.lua"), {["$$CORESIZE"] = tostring(#installerCore)})
-local installerTail = lexCrunch.process(u.read("insttail.lua"), {})
+ installerPayload = installerCore .. tarData
+ installerProgramLength = #installerCore
+end
 
 -- Installer Compression --
-local rawData = installerCore .. tarData
-io.stderr:write("compressing...\n")
-local compressionEngine, compressedData = algImpl(rawData, lexCrunch)
--- RISM [[
-compressedData = compressedData:gsub("\xFE", "\xFE\xFE")
-compressedData = compressedData:gsub("]]", "]\xFE]")
-compressedData = "\x00" .. compressedData
--- ]]
-io.stderr:write("compression with " .. alg .. ": " .. #rawData .. " -> " .. #compressedData .. "\n")
+for _, v in ipairs(algorithmsInReverseOrder) do
+ io.stderr:write("compressing (" .. v .. ")\n")
+ local algImpl = require(v .. ".compress")
+ local algEngine, algData = algImpl(installerPayload, lexCrunch)
+ io.stderr:write("result: " .. #installerPayload .. " -> " .. #algData .. "\n")
+ -- prepend the program length of the last section
+ algEngine = lexCrunch.process("$iBlockingLen = " .. installerProgramLength .. " " .. algEngine, {})
+ -- commit
+ installerPayload = algEngine
+ installerProgramLength = #installerPayload
+ installerFinalized = algData .. installerFinalized
+end
 
--- Installer Final Generation --
+-- Installer Final --
+
+-- This is a special case, so the program length/payload/etc. business has to be repeated.
 put("--" .. cid .. "\n")
 put("--This is released into the public domain. No warranty is provided, implied or otherwise.\n")
-put(lexCrunch.process(installerHead .. compressionEngine .. installerTail, {}))
-put("--[[" .. compressedData .. "]]")
+put(lexCrunch.process(u.read("insthead.lua"), {["$$CORESIZE"] = tostring(installerProgramLength)}))
+
+local RISM = installerPayload .. installerFinalized
+RISM = RISM:gsub("\xFE", "\xFE\xFE")
+RISM = RISM:gsub("]]", "]\xFE]")
+RISM = "\x00" .. RISM
+put("--[[" .. RISM .. "]]")
 
 -- Dumping debug info --
 local dbg = io.open("iSymTab", "wb")

inst/instcore.lua

@@ -28,8 +28,8 @@ $icSectorsRead = 0
 $iBlockingLen = 512
 function $iBlockingHook($a0)
  if $icBytesRemaining > 0 then
-  $NT|icByteAdv
-  $icByteAdv = math.min(512, $icBytesRemaining)
+  ${
+  $L|icByteAdv = math.min(512, $icBytesRemaining)
   $icBytesRemaining = $icBytesRemaining - $icByteAdv
   if $icFile then
    $filesystem.write($icFile, $a0:sub(1, $icByteAdv))
@@ -38,7 +38,7 @@ function $iBlockingHook($a0)
     $icFile = nil
    end
   end
-  $DT|icByteAdv
+  $}
  else
   $icFilename = $a0:sub(1, 100):gsub("\x00", "")
   -- this sets up the reading/skipping of data

inst/insthead.lua

@@ -14,21 +14,54 @@ $readInFile = $filesystem.open("init.neoi.lua", "rb")
 
 $iBlockingBuffer = ""
 $iBlockingLen = $$CORESIZE
-$iBlockingHook = function ($a0)
- -- This takes over the iBlockingHook.
- assert(load($a0))()
+${
+function $iBlockingHook($L|lBlock)
+ -- Run the next script (replacement compression engine,)
+ assert(load($lBlock))()
 end
+$}
 
-$engineOutput = function ($a0)
- $iBlockingBuffer = $iBlockingBuffer .. $a0
+${
+function $engineOutput($L|lBlock)
+ $iBlockingBuffer = $iBlockingBuffer .. $lBlock
  while #$iBlockingBuffer >= $iBlockingLen do
-  $NT|iBlock
-  $iBlock = $iBlockingBuffer:sub(1, $iBlockingLen)
+  $lBlock = $iBlockingBuffer:sub(1, $iBlockingLen)
   $iBlockingBuffer = $iBlockingBuffer:sub($iBlockingLen + 1)
-  $iBlockingHook($iBlock)
-  $DT|iBlock
+  $iBlockingHook($lBlock)
  end
 end
+$}
+$engineInput = $engineOutput
 
--- DECOMPRESSION ENGINE FOLLOWS THIS CODE --
+while true do
+ $readInBlock = $filesystem.read($readInFile, 1024)
+ ${
+ for i = 1, #$readInBlock do
+  -- Read-in state machine
+
+  -- IT IS VERY IMPORTANT that read-in be performed char-by-char.
+  -- This is because of compression chain-loading; if the switch between engines isn't "clean",
+  --  bad stuff happens.
+
+  -- This character becomes invalid once
+  --  it gets passed to engineInput,
+  --  but that's the last step, so it's ok!
+  $L|readInChar = $readInBlock:sub(i, i)
+  if not $readInState then
+   if $readInChar == "\x00" then
+    $readInState = 0
+   end
+  elseif $readInState == 0 then
+   if $readInChar == "\xFE" then
+    $readInState = 1
+   else
+    $engineInput($readInChar)
+   end
+  else
+   $engineInput($readInChar)
+   $readInState = 0
+  end
+ end
+ $}
+end
 

inst/insttail.lua

@@ -1,32 +0,0 @@
--- KOSNEO installer base
--- This is released into the public domain.
--- No warranty is provided, implied or otherwise.
-
--- DECOMPRESSION ENGINE PRECEDES THIS CODE --
-
-while true do
- $readInBlock = $filesystem.read($readInFile, 1024)
- for i = 1, #$readInBlock do
-  -- Read-in state machine
-  $NT|readInChar
-  $readInChar = $readInBlock:sub(i, i)
-  if not $readInState then
-   if $readInChar == "\x00" then
-    $readInState = 0
-   end
-  elseif $readInState == 0 then
-   if $readInChar == "\xFE" then
-    $readInState = 1
-   else
-    $engineInput($readInChar)
-   end
-  else
-   $engineInput($readInChar)
-   $readInState = 0
-  end
- end
- $DT|readInChar
-end
-
--- COMPRESSED DATA FOLLOWS THIS CODE --
-

inst/libs/lexcrunch.lua

@@ -135,48 +135,30 @@ return function ()
     assert(defines[str], "no define " .. str)
     return defines[str]
    end
-   local comGet = str:sub(2):gmatch("[^%|]*")
-   local command = comGet()
-   if command == "NT" then
-    -- temporaries +
-    allocTmp("$" .. comGet())
-    return ""
-   elseif command == "DT" then
-    -- temporaries -
-    local id = "$" .. comGet()
-    assert(forwardSymTab[id], "no such var: " .. id)
-    assert(reverseSymTab[forwardSymTab[id]] == "temporary", "var not allocated as temporary: " .. id)
-    table.insert(temporaryPool, forwardSymTab[id])
-    forwardSymTab[id] = nil
-    return ""
-   elseif command == "NA" then
-    local id = "$" .. comGet()
-    local ib = "$" .. comGet()
-    assert(forwardSymTab[ib], "no such var: " .. ib)
-    assert(not forwardSymTab[id], "alias already present: " .. id)
-    forwardSymTab[id] = forwardSymTab[ib]
-    return ""
-   elseif command == "DA" then
-    local id = "$" .. comGet()
-    assert(forwardSymTab[id], "no entry for " .. id)
-    forwardSymTab[id] = nil
-    return ""
-   elseif command == "L" then
-    local id = "$" .. comGet()
+   local com = {}
+   for v in str:sub(2):gmatch("[^%|]*") do
+    table.insert(com, v)
+   end
+   if com[1] == "L" then
+    assert(#com == 2)
+    local id = "$" .. com[2]
     assert(stackFrames[1], "allocation of " .. id .. " outside of stack frame")
     table.insert(stackFrames[1], id)
     return allocTmp(id)
-   elseif command == "{" then
+   elseif com[1] == "{" then
+    assert(#com == 1)
     table.insert(stackFrames, 1, {})
     return ""
-   elseif command == "}" then
+   elseif com[1] == "}" then
+    assert(#com == 1)
     for _, id in ipairs(table.remove(stackFrames, 1)) do
      table.insert(temporaryPool, forwardSymTab[id])
      forwardSymTab[id] = nil
     end
     return ""
    else
-    local id = "$" .. command
+    assert(#com == 1)
+    local id = "$" .. com[1]
     -- normal handling
     if forwardSymTab[id] then
      return forwardSymTab[id]

inst/symbolGuide.md

@@ -1,24 +1,20 @@
 # The Symbol Guide
 
+## lexCrunch commands
+
 The following prefixes are really special,
  and are lexcrunch's responsibility:
 
 "$$THING" : These are defines.
 "$Thing" : Writes a global into stream. If not already allocated, is allocated a global.
 
-DEPRECATED (yes, already):
- "$NT|THING" : Allocates THING from temp pool
- "$DT|THING" : Returns temp THING to temp pool
-
-PROBABLY DEPRECATED:
- "$NA|THING1|THING2" : Copies $THING2 to $THING1 in forwards table (not in backwards table)
- "$DA|THING1" : Removes THING1 in forwards table.
-
 "${" : Opens a frame.
 "$}" : Closes a frame. (Attached temps are released.)
 "$L|THING" : Allocates THING from temp pool, attaches to stack frame, writes to stream.
  Use inside a comment to erase the written symbol
 
+## Conventions
+
 The rest are convention:
 "$iThing" symbols are Installer Wrapper.
 "$icThing" symbols are Installer Core.

laboratory/reset-i.sh

@@ -7,5 +7,5 @@ cp ocemu.cfg.default ocemu.cfg && rm -rf c1-sda c1-sdb tmpfs
 mkdir c1-sda c1-sdb
 echo -n c1-sda > c1-eeprom/data.bin
 cd ..
-./package.sh $1
+./package.sh $*
 cp inst.lua laboratory/c1-sda/init.lua

package.sh

@@ -15,7 +15,7 @@ cd ..
 
 # The Installer Creator
 cd inst
-lua build.lua $1 ../code.tar `git status --porcelain=2 --branch | grep branch.oid | grep -E -o "[0-9a-f]*$" -` > ../inst.lua
+lua build.lua `git status --porcelain=2 --branch | grep branch.oid | grep -E -o "[0-9a-f]*$" -` ../code.tar $* > ../inst.lua
 lua status.lua ../inst.lua
 cd ..