mirror of https://github.com/20kdc/OC-KittenOS.git
90 lines
2.5 KiB
Lua
90 lines
2.5 KiB
Lua
-- Copyright (C) 2018-2021 by KittenOS NEO contributors
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--
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-- Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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-- THIS SOFTWARE.
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-- PREPROC (r9 edition): preprocess input to be 7-bit
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local frw = require("libs.frw")
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local
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-- SHARED WITH DECOMPRESSION ENGINE
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function p(x, y)
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if x == 126 then
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return string.char(y), 3
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elseif x == 127 then
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return string.char(128 + y), 3
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elseif x >= 32 then
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return string.char(x), 2
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elseif x == 31 then
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return "\n", 2
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elseif x == 30 then
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return "\x00", 2
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end
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return string.char(("enart"):byte(x % 5 + 1), ("ndtelh"):byte((x - x % 5) / 5 + 1)), 2
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end
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local preprocParts = {}
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local preprocMaxLen = 0
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for i = 0, 127 do
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for j = 0, 127 do
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local d, l = p(i, j)
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if d then
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preprocMaxLen = math.max(preprocMaxLen, #d)
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l = l - 1
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if (not preprocParts[d]) or (#preprocParts[d] > l) then
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if l == 2 then
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preprocParts[d] = string.char(i, j)
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else
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preprocParts[d] = string.char(i)
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end
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end
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end
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end
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end
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local function preprocWithPadding(blk, p)
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local out = ""
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local needsPadding = false
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while blk ~= "" do
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p(blk)
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local len = math.min(preprocMaxLen, #blk)
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while len > 0 do
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local seg = blk:sub(1, len)
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if preprocParts[seg] then
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out = out .. preprocParts[seg]
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needsPadding = #preprocParts[seg] < 2
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blk = blk:sub(#seg + 1)
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break
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end
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len = len - 1
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end
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assert(len ~= 0)
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end
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-- This needsPadding bit is just sort of quickly added in
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-- to keep this part properly maintained
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-- even though it might never get used
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if needsPadding then
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return out .. "\x00"
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end
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return out
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end
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local bdCore = require("bdivide.core")
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return function (data, lexCrunch)
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io.stderr:write("preproc: ")
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local pi = frw.progress()
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local function p(b)
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pi(1 - (#b / #data))
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end
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data = preprocWithPadding(data, p)
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io.stderr:write("\nbdivide: ")
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pi = frw.progress()
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data = bdCore.bdividePad(bdCore.bdivide(data, p))
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io.stderr:write("\n")
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return lexCrunch.process(frw.read("bdivide/instdeco.lua"), {}), data
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end
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