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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 __future__ import annotations

from struct import pack, unpack_from

def i8(c: bytes) -> int:

return c[0]

def o8(i: int) -> bytes:

return bytes((i & 255,))

# Input, le = little endian, be = big endian

def i16le(c: bytes, o: int = 0) -> int:

"""

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: bytes, o: int = 0) -> int:

"""

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: bytes, o: int = 0) -> int:

"""

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: bytes, o: int = 0) -> int:

"""

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: bytes, o: int = 0) -> int:

"""

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 si32be(c: bytes, o: int = 0) -> int:

"""

Converts a 4-bytes (32 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(">i", c, o)[0]

def i16be(c: bytes, o: int = 0) -> int:

return unpack_from(">H", c, o)[0]

def i32be(c: bytes, o: int = 0) -> int:

return unpack_from(">I", c, o)[0]

# Output, le = little endian, be = big endian

def o16le(i: int) -> bytes:

return pack("<H", i)

def o32le(i: int) -> bytes:

return pack("<I", i)

def o16be(i: int) -> bytes:

return pack(">H", i)

def o32be(i: int) -> bytes:

return pack(">I", i)