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Diffstat (limited to 'contrib/ffmpeg/libavutil/crc.c')
-rw-r--r-- | contrib/ffmpeg/libavutil/crc.c | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/contrib/ffmpeg/libavutil/crc.c b/contrib/ffmpeg/libavutil/crc.c deleted file mode 100644 index 02fb860b8..000000000 --- a/contrib/ffmpeg/libavutil/crc.c +++ /dev/null @@ -1,111 +0,0 @@ -/* - * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "common.h" -#include "crc.h" - -#if LIBAVUTIL_VERSION_INT < (50<<16) -AVCRC *av_crcEDB88320; -AVCRC *av_crc04C11DB7; -AVCRC *av_crc8005 ; -AVCRC *av_crc07 ; -#else -AVCRC av_crcEDB88320[257]; -AVCRC av_crc04C11DB7[257]; -AVCRC av_crc8005 [257]; -AVCRC av_crc07 [257]; -#endif - -/** - * Inits a crc table. - * @param ctx must be an array of sizeof(AVCRC)*257 or sizeof(AVCRC)*1024 - * @param cts_size size of ctx in bytes - * @return <0 on failure - */ -int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size){ - int i, j; - uint32_t c; - - if (bits < 8 || bits > 32 || poly >= (1LL<<bits)) - return -1; - if (ctx_size != sizeof(AVCRC)*257 && ctx_size != sizeof(AVCRC)*1024) - return -1; - - for (i = 0; i < 256; i++) { - if (le) { - for (c = i, j = 0; j < 8; j++) - c = (c>>1)^(poly & (-(c&1))); - ctx[i] = c; - } else { - for (c = i << 24, j = 0; j < 8; j++) - c = (c<<1) ^ ((poly<<(32-bits)) & (((int32_t)c)>>31) ); - ctx[i] = bswap_32(c); - } - } - ctx[256]=1; -#ifndef CONFIG_SMALL - if(ctx_size >= sizeof(AVCRC)*1024) - for (i = 0; i < 256; i++) - for(j=0; j<3; j++) - ctx[256*(j+1) + i]= (ctx[256*j + i]>>8) ^ ctx[ ctx[256*j + i]&0xFF ]; -#endif - - return 0; -} - -uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length){ - const uint8_t *end= buffer+length; - -#ifndef CONFIG_SMALL - if(!ctx[256]) - while(buffer<end-3){ - crc ^= le2me_32(*(uint32_t*)buffer); buffer+=4; - crc = ctx[3*256 + ( crc &0xFF)] - ^ctx[2*256 + ((crc>>8 )&0xFF)] - ^ctx[1*256 + ((crc>>16)&0xFF)] - ^ctx[0*256 + ((crc>>24) )]; - } -#endif - while(buffer<end) - crc = ctx[((uint8_t)crc) ^ *buffer++] ^ (crc >> 8); - - return crc; -} - -#ifdef TEST -#undef printf -main(){ - uint8_t buf[1999]; - int i; - int p[4][4]={{1, 32, 0xedb88320L, 0x3D5CDD04}, - {0, 32, 0x04c11db7L, 0xC0F5BAE0}, - {0, 16, 0x8005 , 0x1FBB }, - {0, 8, 0x07 , 0xE3 },}; - AVCRC ctx[1 ? 1024:257]; - - for(i=0; i<sizeof(buf); i++) - buf[i]= i+i*i; - - for(i=0; i<4; i++){ - av_crc_init(ctx, p[i][0], p[i][1], p[i][2], sizeof(ctx)); - printf("crc %08X =%X\n", p[i][2], av_crc(ctx, 0, buf, sizeof(buf))); - } -} -#endif |