mirror of
https://github.com/RetroPortingToolKit/psxrecomp
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Shokunin
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
#ifndef PSX_NETPLAY_LOAD_PROBE_H
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#define PSX_NETPLAY_LOAD_PROBE_H
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#include <stdint.h>
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/* A guest can match the host's LOAD probe and start applying its local save
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* before the host has collected every seat's reply. If another seat misses,
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* the host later sends the authoritative blob to all guests. Remember the
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* verified local probe so a guest that already applied those exact bytes can
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* verify the transfer and avoid restoring the same machine state twice. */
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typedef struct PsxNetplayLoadProbe {
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int valid;
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int local_applied;
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int slot;
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uint32_t size;
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uint32_t crc;
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} PsxNetplayLoadProbe;
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static inline void psx_netplay_load_probe_clear(PsxNetplayLoadProbe *probe)
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{
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if (!probe) return;
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probe->valid = 0;
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probe->local_applied = 0;
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probe->slot = -1;
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probe->size = 0;
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probe->crc = 0;
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}
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static inline void psx_netplay_load_probe_record(PsxNetplayLoadProbe *probe,
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int slot, uint32_t size,
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uint32_t crc)
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{
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if (!probe) return;
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probe->valid = size != 0u;
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probe->local_applied = 0;
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probe->slot = slot;
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probe->size = size;
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probe->crc = crc;
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}
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static inline void psx_netplay_load_probe_mark_applied(PsxNetplayLoadProbe *probe,
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int slot)
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{
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if (probe && probe->valid && probe->slot == slot)
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probe->local_applied = 1;
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}
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/* All four fingerprints are required: local probe, completed local apply,
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* authoritative wire blob, and a fresh read of the still-unmodified save
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* slot. The caller computes the blob CRC with the protocol checksum routine. */
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static inline int psx_netplay_load_probe_can_reuse(
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const PsxNetplayLoadProbe *probe, int slot,
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uint32_t blob_size, uint32_t blob_crc,
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uint32_t local_size, uint32_t local_crc)
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{
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return probe && probe->valid && probe->local_applied &&
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probe->slot == slot && probe->size == blob_size &&
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probe->crc == blob_crc && local_size == probe->size &&
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local_crc == probe->crc;
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}
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#endif /* PSX_NETPLAY_LOAD_PROBE_H */
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