lua-struct

Implementation of binary packing/unpacking in pure lua

what is it for?

You can use it to pack and unpack binary data in pure lua. The idea is very similar to PHP unpack and pack functions.

available types

"b" a signed char.
"B" an unsigned char.
"h" a signed short (2 bytes).
"H" an unsigned short (2 bytes).
"i" a signed int (4 bytes).
"I" an unsigned int (4 bytes).
"l" a signed long (8 bytes).
"L" an unsigned long (8 bytes).
"f" a float (4 bytes).
"d" a double (8 bytes).
"s" a zero-terminated string.
"cn" a sequence of exactly n chars corresponding to a single Lua string.

how to use it?

require "struct"

local packed = struct.pack('<LIhBsbfd', 123456789123456789, 123456789, -3200, 255, 'Test message', -1, 1.56789, 1.56789)
local L, I, h, B, s, b, f, d = struct.unpack('<LIhBsbfd', packed)
print(L, I, h, B, s, b, f, d)

1.2345678912346e+017    123456789    -3200    255    Test message    -1    1.5678899288177    1.56789