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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