mirror of
https://github.com/radareorg/radare2.git
synced 2024-10-10 12:24:20 +00:00
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2007-2010
|
|
* pancake <youterm.com>
|
|
*
|
|
* radare is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* radare is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with radare; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include "r_types.h"
|
|
|
|
static char crc_table_is_init = 0;
|
|
static ut32 crc_table[256];
|
|
|
|
R_API ut32 r_hash_crc32(const ut8 *buf, ut64 len)
|
|
{
|
|
unsigned int crc = 0;
|
|
|
|
if (!crc_table_is_init) {
|
|
ut32 i, j, h = 1;
|
|
crc_table_is_init = 1;
|
|
crc_table[0] = 0;
|
|
for (i = 128; i; i >>= 1) {
|
|
h = (h >> 1) ^ ((h & 1) ? (int)0xedb88320 : 0);
|
|
for (j = 0; j < 256; j += 2*i)
|
|
crc_table[i+j] = crc_table[j] ^ h;
|
|
}
|
|
}
|
|
|
|
crc ^= 0xffffffff;
|
|
while (len--)
|
|
crc = (crc >> 8) ^ crc_table[(crc ^ *buf++) & 0xff];
|
|
|
|
return crc ^ 0xffffffff;
|
|
}
|