80 lines
2.9 KiB
Python
80 lines
2.9 KiB
Python
# Copyright 2007 Matt Chaput. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY MATT CHAPUT ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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# EVENT SHALL MATT CHAPUT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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# OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and documentation are
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# those of the authors and should not be interpreted as representing official
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# policies, either expressed or implied, of Matt Chaput.
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import sys
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from struct import Struct, calcsize
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IS_LITTLE = sys.byteorder == "little"
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_INT_SIZE = calcsize("!i")
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_SHORT_SIZE = calcsize("!H")
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_LONG_SIZE = calcsize("!Q")
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_FLOAT_SIZE = calcsize("!f")
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_DOUBLE_SIZE = calcsize("!d")
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_byte_struct = Struct("!B")
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_sbyte_struct = Struct("!b")
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_ushort_struct = Struct("!H")
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_int_struct = Struct("!i")
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_uint_struct = Struct("!I")
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_long_struct = Struct("!q")
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_ulong_struct = Struct("!Q")
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_float_struct = Struct("!f")
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_double_struct = Struct("!d")
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_ushort_le_struct = Struct("<H")
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_uint_le_struct = Struct("<I")
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pack_byte = _byte_struct.pack
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pack_sbyte = _sbyte_struct.pack
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pack_ushort = _ushort_struct.pack
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pack_int = _int_struct.pack
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pack_uint = _uint_struct.pack
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pack_long = _long_struct.pack
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pack_ulong = _ulong_struct.pack
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pack_float = _float_struct.pack
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pack_double = _double_struct.pack
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pack_ushort_le = _ushort_le_struct.pack
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pack_uint_le = _uint_le_struct.pack
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unpack_byte = _byte_struct.unpack # ord() might be faster
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unpack_sbyte = _sbyte_struct.unpack
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unpack_ushort = _ushort_struct.unpack
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unpack_int = _int_struct.unpack
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unpack_uint = _uint_struct.unpack
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unpack_long = _long_struct.unpack
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unpack_ulong = _ulong_struct.unpack
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unpack_float = _float_struct.unpack
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unpack_double = _double_struct.unpack
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unpack_ushort_le = _ushort_le_struct.unpack
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unpack_uint_le = _uint_le_struct.unpack
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if sys.version_info[0] < 3:
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emptybytes = ""
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else:
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emptybytes = "".encode("latin-1")
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