#include <fcntl.h>
#include <math.h>
#include <time.h>
+#include <string.h>
+#include "avassert.h"
#include "internal.h"
-#include "mem.h"
+ #include "intreadwrite.h"
#include "timer.h"
#include "random_seed.h"
#include "sha.h"
- #include "intreadwrite.h"
+#ifndef TEST
+#define TEST 0
+#endif
+
static int read_random(uint32_t *dst, const char *file)
{
#if HAVE_UNISTD_H
static uint32_t get_generic_seed(void)
{
- struct AVSHA *sha = av_sha_alloc();
+ uint8_t tmp[120];
+ struct AVSHA *sha = (void*)tmp;
clock_t last_t = 0;
static uint64_t i = 0;
- static uint32_t buffer[512] = {0};
+ static uint32_t buffer[512] = { 0 };
unsigned char digest[20];
uint64_t last_i = i;
for (;;) {
clock_t t = clock();
- if(last_t == t){
- buffer[i&511]++;
- }else{
- buffer[++i&511]+= (t-last_t) % 3294638521U;
- if(last_i && i-last_i > 4 || i-last_i > 64 || TEST && i-last_i > 8)
+ if (last_t == t) {
+ buffer[i & 511]++;
+ } else {
+ buffer[++i & 511] += (t - last_t) % 3294638521U;
- if (last_i && i - last_i > 4 || i - last_i > 64)
++ if (last_i && i - last_i > 4 || i - last_i > 64 || TEST && i - last_i > 8)
break;
}
last_t = t;
}
- if (!sha) {
- uint32_t seed = 0;
- int j;
- // Unable to allocate an sha context, just xor the buffer together
- // to create something hopefully unique.
- for (j = 0; j < 512; j++)
- seed ^= buffer[j];
- return seed;
- }
+ if(TEST)
+ buffer[0] = buffer[1] = 0;
+
av_sha_init(sha, 160);
- av_sha_update(sha, (uint8_t*)buffer, sizeof(buffer));
- av_sha_update(sha, (const uint8_t *) buffer, sizeof(buffer));
++ av_sha_update(sha, (const uint8_t *)buffer, sizeof(buffer));
av_sha_final(sha, digest);
- return AV_RB32(digest) + AV_RB32(digest+16);
- av_free(sha);
+ return AV_RB32(digest) + AV_RB32(digest + 16);
}
uint32_t av_get_random_seed(void)