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Diffstat (limited to 'src/libffmpeg/libavutil/adler32.c')
-rw-r--r-- | src/libffmpeg/libavutil/adler32.c | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/src/libffmpeg/libavutil/adler32.c b/src/libffmpeg/libavutil/adler32.c deleted file mode 100644 index 50d57470b..000000000 --- a/src/libffmpeg/libavutil/adler32.c +++ /dev/null @@ -1,71 +0,0 @@ -/* adler32.c -- compute the Adler-32 checksum of a data stream - * This is a modified version based on adler32.c from the zlib library. - * - * Copyright (C) 1995 Mark Adler - * - * This software is provided 'as-is', without any express or implied - * warranty. In no event will the authors be held liable for any damages - * arising from the use of this software. - * - * Permission is granted to anyone to use this software for any purpose, - * including commercial applications, and to alter it and redistribute it - * freely, subject to the following restrictions: - * - * 1. The origin of this software must not be misrepresented; you must not - * claim that you wrote the original software. If you use this software - * in a product, an acknowledgment in the product documentation would be - * appreciated but is not required. - * 2. Altered source versions must be plainly marked as such, and must not be - * misrepresented as being the original software. - * 3. This notice may not be removed or altered from any source distribution. - * - */ - -#include "common.h" -#include "adler32.h" - -#define BASE 65521L /* largest prime smaller than 65536 */ - -#define DO1(buf) {s1 += *buf++; s2 += s1;} -#define DO4(buf) DO1(buf); DO1(buf); DO1(buf); DO1(buf); -#define DO16(buf) DO4(buf); DO4(buf); DO4(buf); DO4(buf); - -unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf, unsigned int len) -{ - unsigned long s1 = adler & 0xffff; - unsigned long s2 = adler >> 16; - - while (len>0) { -#ifdef CONFIG_SMALL - while(len>4 && s2 < (1U<<31)){ - DO4(buf); len-=4; -#else - while(len>16 && s2 < (1U<<31)){ - DO16(buf); len-=16; -#endif - } - DO1(buf); len--; - s1 %= BASE; - s2 %= BASE; - } - return (s2 << 16) | s1; -} - -#ifdef TEST -#include "log.h" -#define LEN 7001 -volatile int checksum; -int main(){ - int i; - char data[LEN]; - av_log_level = AV_LOG_DEBUG; - for(i=0; i<LEN; i++) - data[i]= ((i*i)>>3) + 123*i; - for(i=0; i<1000; i++){ - START_TIMER - checksum= av_adler32_update(1, data, LEN); - STOP_TIMER("adler") - } - av_log(NULL, AV_LOG_DEBUG, "%X == 50E6E508\n", checksum); -} -#endif |