SRCshift.lua - compile/decompile Steins;Gate scripts

SRCshift.lua

--[[
	SRCshift.lua - compile/decompile Steins;Gate scripts
	
	REQUIRES LUA 5.3 OR HIGHER
	
	Copyright (c) 2015 TheZombieKiller & carstene1ns

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	THE SOFTWARE.
	
	Fixes/improvements over Ruby version
	* No longer adds random newlines
--]]

function string_unpack(str)
	local t = {}
	for i = 1, #str do
		local v = string.unpack("B", str:sub(i, i))
		table.insert(t, v)
	end
	return t
end

function string_pack(t)
	local str = ""
	for k, v in pairs(t) do
		str = str .. string.pack("B", v)
	end
	return str
end

function string_map(t, map)
	local nt = {}
	for k, v in pairs(t) do
		nt[k] = map[v]
	end
	return nt
end

-- no args?
if #arg < 1 then
	print "Usage: file.src"
	return
end

-- no file?
file = io.open(arg[1])
if not file then
	print(("ERROR: '%s' is not a file!"):format(arg[1]))
	return
end

-- generate lookup table
lt = {}
alternate = -4
base = 160
for i = 0, 255 do
	if i % 4 == 0 then alternate = alternate * -1 end
	if i % 32 == 0 then base = base - 64 end
	lt[i] = base + i + alternate & 0xff
end

src = file:read "*all"
file:close()
src = string_unpack(src)
src = string_map(src, lt)
src = string_pack(src)

file = io.open(arg[1], "wb")
file:write(src)
file:close()

print "done!"
return

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