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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.
- #
-
-
- """Binary input/output support routines."""
-
-
- 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 si16be(c, o=0):
- """
- Converts a 2-bytes (16 bits) string to a signed integer, big endian.
-
- :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)
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