| 1 | /**********************************************************************
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| 2 | *
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| 3 | * CRC32.h
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| 4 | * Copyright (C) 2003 UNESCO
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| 5 | *
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| 6 | * A component of the Greenstone digital library software
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| 7 | * from the New Zealand Digital Library Project at the
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| 8 | * University of Waikato, New Zealand.
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| 9 | *
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| 10 | * This program is free software; you can redistribute it and/or modify
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| 11 | * it under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; either version 2 of the License, or
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| 13 | * (at your option) any later version.
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| 14 | *
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| 15 | * This program is distributed in the hope that it will be useful,
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | * GNU General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU General Public License
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| 21 | * along with this program; if not, write to the Free Software
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| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | *
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| 24 | *********************************************************************/
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| 25 |
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| 26 | ////////////////////////////////////////////////////////////////////////////////////
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| 27 | // CRC32.H
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| 28 | //
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| 29 | // The CRC32 functions (Cyclic Redundancy Check) are used to
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| 30 | // calculate a sophisticated checksum based on the algebra of
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| 31 | // polynomials. The Cyclic Redundancy Check, is a way to detect
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| 32 | // bit errors that occur during data storage or transmission.
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| 33 | // The CRC-32 algorithm operates on a block of data as a single
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| 34 | // large numerical value. The algorithm divides this large value
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| 35 | // by the CRC-32 polynomial or generator polynomial, leaving the
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| 36 | // remainder 32-bit, which is the checksum.
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| 37 | #ifndef __CRC32_H__
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| 38 | #define __CRC32_H__
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| 39 |
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| 40 | #include <fstream>
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| 41 |
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| 42 | unsigned long CalcCRC32(char *buf, unsigned len);
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| 43 | unsigned long CalcCRC32(const char *buf, unsigned len);
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| 44 | unsigned long CalcCRC32(unsigned char c, unsigned long CRC);
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| 45 | unsigned long CalcCRC32(std::fstream &infile);
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| 46 |
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| 47 | #ifdef __USE_CRC32_TABLE_FUNCTIONS__
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| 48 | #include <iostream>
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| 49 | int makeCRC32(std::ostream &stream);
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| 50 | #endif
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| 51 |
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| 52 | #endif // __CRC32_H__
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