binaryluadiff.lua

assert(#arg == 2)
local source
local dest
local f1 = assert(io.open(arg[1], "rb"), "cannot open " .. arg[1])
source = f1:read("*all")
f1:close()
local f2 = assert(io.open(arg[2], "rb"), "cannot open " .. arg[2])
dest = f2:read("*all")
f2:close()
assert(#source == #dest)
print("ok")
print[[
| Position | OriginalBytes |  PatchedBytes |
|----------|:-------------:|--------------:|]]


local i = 1
local max = #source

while (i <= max) do
	if source:sub(i, i) ~= dest:sub(i, i) then
		local i2 = 0
		local tmpTbl = {}

		while (source:sub(i + i2, i + i2) ~= dest:sub(i + i2, i + i2)) do
			table.insert(tmpTbl, { string.format('%02X',(source:sub(i + i2, i + i2):byte())),  string.format('%02X',(dest:sub(i + i2, i + i2):byte()))})

			i2 = i2 + 1
		end

		local originalBytes = ""
		local patchedBytes = ""

		for k, v in ipairs(tmpTbl) do
			originalBytes = originalBytes .. v[1] .. " "
			patchedBytes = patchedBytes .. v[2] .. " "
		end

		print(string.format("| 0x%s | %s | %s |", string.format('%08X', i), originalBytes, patchedBytes))
		i = i + i2
	end

	i = i + 1
end