mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Alexandros Mandravillis
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
#ifndef PSXRECOMP_WS_PREPASS_GUARD_H
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#define PSXRECOMP_WS_PREPASS_GUARD_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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uint32_t word_count;
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uint64_t fingerprint;
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} WsPrepassPacketGuard;
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static inline uint64_t ws_prepass_packet_fingerprint(const uint32_t *words,
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uint32_t word_count) {
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uint64_t hash = UINT64_C(1469598103934665603);
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for (uint32_t i = 0; i < word_count; i++) {
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uint32_t word = words[i];
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for (unsigned shift = 0; shift < 32; shift += 8) {
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hash ^= (uint8_t)(word >> shift);
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hash *= UINT64_C(1099511628211);
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}
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}
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hash ^= word_count;
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hash *= UINT64_C(1099511628211);
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return hash;
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}
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static inline WsPrepassPacketGuard ws_prepass_packet_guard(
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const uint32_t *words, uint32_t word_count) {
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WsPrepassPacketGuard guard;
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guard.word_count = word_count;
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guard.fingerprint = ws_prepass_packet_fingerprint(words, word_count);
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return guard;
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}
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static inline int ws_prepass_packet_matches(const WsPrepassPacketGuard *guard,
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const uint32_t *words,
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uint32_t word_count) {
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return guard && guard->word_count == word_count &&
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guard->fingerprint ==
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ws_prepass_packet_fingerprint(words, word_count);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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