-/* adler32.c -- compute the Adler-32 checksum of a data stream
+/*
+ * 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
* 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 "config.h"
#include "adler32.h"
#define BASE 65521L /* largest prime smaller than 65536 */
-#define DO1(buf) {s1 += *buf++; s2 += s1;}
+#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 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;
+ while (len > 0) {
+#if CONFIG_SMALL
+ while (len > 4 && s2 < (1U << 31)) {
+ DO4(buf);
+ len -= 4;
+ }
#else
- while(len>16 && s2 < (1U<<31)){
- DO16(buf); len-=16;
-#endif
+ while (len > 16 && s2 < (1U << 31)) {
+ DO16(buf);
+ len -= 16;
}
+#endif
DO1(buf); len--;
s1 %= BASE;
s2 %= BASE;
}
#ifdef TEST
+#include <string.h>
#include "log.h"
+#include "timer.h"
#define LEN 7001
-volatile int checksum;
-int main(){
+
+static volatile int checksum;
+
+int main(int argc, char **argv)
+{
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_set_level(AV_LOG_DEBUG);
+
+ for (i = 0; i < LEN; i++)
+ data[i] = ((i * i) >> 3) + 123 * i;
+
+ if (argc > 1 && !strcmp(argv[1], "-t")) {
+ for (i = 0; i < 1000; i++) {
+ START_TIMER;
+ checksum = av_adler32_update(1, data, LEN);
+ STOP_TIMER("adler");
+ }
+ } else {
+ checksum = av_adler32_update(1, data, LEN);
}
- av_log(NULL, AV_LOG_DEBUG, "%X == 50E6E508\n", checksum);
+
+ av_log(NULL, AV_LOG_DEBUG, "%X (expected 50E6E508)\n", checksum);
+ return checksum == 0x50e6e508 ? 0 : 1;
}
#endif