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47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
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* Copyright (C) 2007-2010
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* pancake <youterm.com>
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*
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* radare is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* radare is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with radare; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "r_types.h"
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static char crc_table_is_init = 0;
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static ut32 crc_table[256];
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R_API ut32 r_hash_crc32(const ut8 *buf, ut64 len)
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{
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unsigned int crc = 0;
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if (!crc_table_is_init) {
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ut32 i, j, h = 1;
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crc_table_is_init = 1;
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crc_table[0] = 0;
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for (i = 128; i; i >>= 1) {
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h = (h >> 1) ^ ((h & 1) ? (int)0xedb88320 : 0);
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for (j = 0; j < 256; j += 2*i)
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crc_table[i+j] = crc_table[j] ^ h;
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}
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}
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crc ^= 0xffffffff;
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while (len--)
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crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
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return crc ^ 0xffffffff;
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}
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