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# # The Python Imaging Library. # $Id$ # # Binary input/output support routines. # # Copyright (c) 1997-2003 by Secret Labs AB # Copyright (c) 1995-2003 by Fredrik Lundh # Copyright (c) 2012 by Brian Crowell # # See the README file for information on usage and redistribution. # from struct import pack, unpack_from def i8(c): return c if c.__class__ is int else c[0] def o8(i): return bytes((i & 255,)) # Input, le = little endian, be = big endian def i16le(c, o=0): """ Converts a 2-bytes (16 bits) string to an unsigned integer. :param c: string containing bytes to convert :param o: offset of bytes to convert in string """ return unpack_from("<H", c, o)[0] def si16le(c, o=0): """ Converts a 2-bytes (16 bits) string to a signed integer. :param c: string containing bytes to convert :param o: offset of bytes to convert in string """ return unpack_from("<h", c, o)[0] def i32le(c, o=0): """ Converts a 4-bytes (32 bits) string to an unsigned integer. :param c: string containing bytes to convert :param o: offset of bytes to convert in string """ return unpack_from("<I", c, o)[0] def si32le(c, o=0): """ Converts a 4-bytes (32 bits) string to a signed integer. :param c: string containing bytes to convert :param o: offset of bytes to convert in string """ return unpack_from("<i", c, o)[0] def i16be(c, o=0): return unpack_from(">H", c, o)[0] def i32be(c, o=0): return unpack_from(">I", c, o)[0] # Output, le = little endian, be = big endian def o16le(i): return pack("<H", i) def o32le(i): return pack("<I", i) def o16be(i): return pack(">H", i) def o32be(i): return pack(">I", i)