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crcmod_osx
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crcmod
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_crcfunpy.py
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#----------------------------------------------------------------------------- # Low level CRC functions for use by crcmod. This version is implemented in # Python for a couple of reasons. 1) Provide a reference implememtation. # 2) Provide a version that can be used on systems where a C compiler is not # available for building extension modules. # # Copyright (c) 2004 Raymond L. Buvel # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. #----------------------------------------------------------------------------- import sys if sys.version_info.major > 2: long = int def _crc8(data, crc, table): crc = crc & 0xFF for x in data: crc = table[ord(x) ^ crc] return crc def _crc8r(data, crc, table): crc = crc & 0xFF for x in data: crc = table[ord(x) ^ crc] return crc def _crc16(data, crc, table): crc = crc & 0xFFFF for x in data: crc = table[ord(x) ^ ((crc>>8) & 0xFF)] ^ ((crc << 8) & 0xFF00) return crc def _crc16r(data, crc, table): crc = crc & 0xFFFF for x in data: crc = table[ord(x) ^ (crc & 0xFF)] ^ (crc >> 8) return crc def _crc24(data, crc, table): crc = crc & 0xFFFFFF for x in data: crc = table[ord(x) ^ (int(crc>>16) & 0xFF)] ^ ((crc << 8) & 0xFFFF00) return crc def _crc24r(data, crc, table): crc = crc & 0xFFFFFF for x in data: crc = table[ord(x) ^ int(crc & 0xFF)] ^ (crc >> 8) return crc def _crc32(data, crc, table): crc = crc & long(0xFFFFFFFF) for x in data: crc = table[ord(x) ^ (int(crc>>24) & 0xFF)] ^ ((crc << 8) & long(0xFFFFFF00)) return crc def _crc32r(data, crc, table): crc = crc & long(0xFFFFFFFF) for x in data: crc = table[ord(x) ^ int(crc & long(0xFF))] ^ (crc >> 8) return crc def _crc64(data, crc, table): crc = crc & long(0xFFFFFFFFFFFFFFFF) for x in data: crc = table[ord(x) ^ (int(crc>>56) & 0xFF)] ^ ((crc << 8) & long(0xFFFFFFFFFFFFFF00)) return crc def _crc64r(data, crc, table): crc = crc & long(0xFFFFFFFFFFFFFFFF) for x in data: crc = table[ord(x) ^ int(crc & long(0xFF))] ^ (crc >> 8) return crc