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do not write (reset) into reserved

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This commit is contained in:
Yann Collet 2016-08-07 00:28:30 +02:00
parent e513f5d9d6
commit 16bbb84a69
2 changed files with 8 additions and 6 deletions
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11
xxhash.c
View File

@ -559,7 +559,7 @@ XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr)
XXH_PUBLIC_API XXH_errorcode XXH32_reset(XXH32_state_t* statePtr, unsigned int seed)
{
XXH32_state_t state; /* using a local state to memcpy() in order to avoid strict-aliasing warnings */
memset(&state, 0, sizeof(state));
memset(&state, 0, sizeof(state)-4); /* do not write into reserved, for future removal */
state.v1 = seed + PRIME32_1 + PRIME32_2;
state.v2 = seed + PRIME32_2;
state.v3 = seed + 0;
@ -572,7 +572,7 @@ XXH_PUBLIC_API XXH_errorcode XXH32_reset(XXH32_state_t* statePtr, unsigned int s
XXH_PUBLIC_API XXH_errorcode XXH64_reset(XXH64_state_t* statePtr, unsigned long long seed)
{
XXH64_state_t state; /* using a local state to memcpy() in order to avoid strict-aliasing warnings */
memset(&state, 0, sizeof(state));
memset(&state, 0, sizeof(state)-8); /* do not write into reserved, for future removal */
state.v1 = seed + PRIME64_1 + PRIME64_2;
state.v2 = seed + PRIME64_2;
state.v3 = seed + 0;
@ -591,7 +591,8 @@ FORCE_INLINE XXH_errorcode XXH32_update_endian (XXH32_state_t* state, const void
if (input==NULL) return XXH_ERROR;
#endif
state->total_len += len;
state->total_len_32 += len;
state->large_len |= (len>=16) | (state->total_len_32>=16);
if (state->memsize + len < 16) { /* fill in tmp buffer */
XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, len);
@ -657,13 +658,13 @@ FORCE_INLINE U32 XXH32_digest_endian (const XXH32_state_t* state, XXH_endianess
const BYTE* const bEnd = (const BYTE*)(state->mem32) + state->memsize;
U32 h32;
if (state->total_len >= 16) {
if (state->large_len) {
h32 = XXH_rotl32(state->v1, 1) + XXH_rotl32(state->v2, 7) + XXH_rotl32(state->v3, 12) + XXH_rotl32(state->v4, 18);
} else {
h32 = state->v3 /* == seed */ + PRIME32_5;
}
h32 += (U32) state->total_len;
h32 += state->total_len_32;
while (p+4<=bEnd) {
h32 += XXH_readLE32(p, endian) * PRIME32_3;

3
xxhash.h
View File

@ -268,7 +268,8 @@ XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src
Do not use members directly. */
struct XXH32_state_s {
unsigned long long total_len;
unsigned total_len_32;
unsigned large_len;
unsigned v1;
unsigned v2;
unsigned v3;