Source code for PIL._binary

#
# 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 unpack_from, pack
from ._util import py3

if py3:
    def i8(c):
        return c if c.__class__ is int else c[0]

    def o8(i):
        return bytes((i & 255,))
else:
[docs] def i8(c): return ord(c)
[docs] def o8(i): return chr(i & 255)
# Input, le = little endian, be = big endian
[docs]def i16le(c, o=0): """ Converts a 2-bytes (16 bits) string to an unsigned integer. c: string containing bytes to convert o: offset of bytes to convert in string """ return unpack_from("<H", c, o)[0]
[docs]def si16le(c, o=0): """ Converts a 2-bytes (16 bits) string to a signed integer. c: string containing bytes to convert o: offset of bytes to convert in string """ return unpack_from("<h", c, o)[0]
[docs]def i32le(c, o=0): """ Converts a 4-bytes (32 bits) string to an unsigned integer. c: string containing bytes to convert o: offset of bytes to convert in string """ return unpack_from("<I", c, o)[0]
[docs]def si32le(c, o=0): """ Converts a 4-bytes (32 bits) string to a signed integer. c: string containing bytes to convert o: offset of bytes to convert in string """ return unpack_from("<i", c, o)[0]
[docs]def i16be(c, o=0): return unpack_from(">H", c, o)[0]
[docs]def i32be(c, o=0): return unpack_from(">I", c, o)[0]
# Output, le = little endian, be = big endian
[docs]def o16le(i): return pack("<H", i)
[docs]def o32le(i): return pack("<I", i)
[docs]def o16be(i): return pack(">H", i)
[docs]def o32be(i): return pack(">I", i)