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85 lines
2 KiB
C++
85 lines
2 KiB
C++
/**********************************************************************
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*
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* Filename: crc.h
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*
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* Description: A header file describing the various CRC standards.
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*
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* Notes:
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*
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*
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* Copyright (c) 2000 by Michael Barr. This software is placed into
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* the public domain and may be used for any purpose. However, this
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* notice must not be changed or removed and no warranty is either
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* expressed or implied by its publication or distribution.
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**********************************************************************/
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#ifndef _crc_h
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#define _crc_h
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#include "common/system.h" // For types.
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namespace Wintermute {
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#ifndef TRUE
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#define FALSE 0
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#define TRUE !FALSE
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#endif
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/*
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* Select the CRC standard from the list that follows.
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*/
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#define CRC32
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#if defined(CRC_CCITT)
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typedef uint16 crc;
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#define CRC_NAME "CRC-CCITT"
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#define POLYNOMIAL 0x1021
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#define INITIAL_REMAINDER 0xFFFF
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#define FINAL_XOR_VALUE 0x0000
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#define REFLECT_DATA FALSE
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#define REFLECT_REMAINDER FALSE
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#define CHECK_VALUE 0x29B1
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#elif defined(CRC16)
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typedef uint16 crc;
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#define CRC_NAME "CRC-16"
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#define POLYNOMIAL 0x8005
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#define INITIAL_REMAINDER 0x0000
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#define FINAL_XOR_VALUE 0x0000
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#define REFLECT_DATA TRUE
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#define REFLECT_REMAINDER TRUE
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#define CHECK_VALUE 0xBB3D
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#elif defined(CRC32)
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typedef uint32 crc;
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#define CRC_NAME "CRC-32"
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#define POLYNOMIAL 0x04C11DB7
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#define INITIAL_REMAINDER 0xFFFFFFFF
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#define FINAL_XOR_VALUE 0xFFFFFFFF
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#define REFLECT_DATA TRUE
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#define REFLECT_REMAINDER TRUE
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#define CHECK_VALUE 0xCBF43926
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#else
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#error "One of CRC_CCITT, CRC16, or CRC32 must be #define'd."
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#endif
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void crcInit();
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crc crcSlow(unsigned char const message[], int nBytes);
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crc crcFast(unsigned char const message[], int nBytes);
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extern "C" crc crc_initialize();
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extern "C" crc crc_process_byte(unsigned char byteVal, crc remainder);
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extern "C" crc crc_finalize(crc remainder);
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} // End of namespace Wintermute
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#endif /* _crc_h */
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