41 memset(c, 0,
sizeof(*c));
51 static const uint64_t
c1 = UINT64_C(0x87c37b91114253d5);
52 static const uint64_t
c2 = UINT64_C(0x4cf5ad432745937f);
54 #define ROT(a, b) (((a) << (b)) | ((a) >> (64 - (b)))) 94 #if FF_API_CRYPTO_SIZE_T 103 if (len <= 0)
return;
108 if (--len <= 0)
return;
117 end = src + (len & ~15);
132 memcpy(c->
state, src, len);
137 static inline uint64_t
fmix(uint64_t k)
140 k *= UINT64_C(0xff51afd7ed558ccd);
142 k *= UINT64_C(0xc4ceb9fe1a85ec53);
Memory handling functions.
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
void av_murmur3_init_seeded(AVMurMur3 *c, uint64_t seed)
Initialize or reinitialize an AVMurMur3 hash context with a seed.
Public header for MurmurHash3 hash function implementation.
static av_cold int end(AVCodecContext *avctx)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
void av_murmur3_init(AVMurMur3 *c)
Initialize or reinitialize an AVMurMur3 hash context.
static uint64_t update_h2(uint64_t k, uint64_t h1, uint64_t h2)
static uint64_t get_k2(const uint8_t *src)
static uint64_t get_k1(const uint8_t *src)
static uint64_t fmix(uint64_t k)
void av_murmur3_update(AVMurMur3 *c, const uint8_t *src, int len)
Update hash context with new data.
static uint64_t update_h1(uint64_t k, uint64_t h1, uint64_t h2)
AVMurMur3 * av_murmur3_alloc(void)
Allocate an AVMurMur3 hash context.
void av_murmur3_final(AVMurMur3 *c, uint8_t dst[16])
Finish hashing and output digest value.