mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -04:00
Alexandros Mandravillis
5fbd11921a
The lobby's BIOS identity was a two-value token, openbios or scph1001, and scph1001 meant "some retail dump". An SCPH-5552 peer and an SCPH-1001 peer both offered it, the host settled it, each peer booted its own image, and the rollback boot digest never matched: about 20 s of black window, then both players back in the lobby with no reason (reported in #243). Each offer now carries the CRC-32 of the retail image that peer would boot (online bios_offer.retail_crc; LAN JOIN line 6). The host settles retail only when every seat offers the same CRC, else OpenBIOS when every seat links it, else refuses to start and puts the reason on the launcher's status line ("Players use different BIOS images (SCPH-5552 and SCPH-1001) ..."). The settled CRC ships in match_caps (session_bios_crc) and on MOTK1 START line 7, and each peer boots only a dump with that CRC. Rooms where every peer has the same image keep working, including SCPH-5552-only builds with no OpenBIOS. Old peers send no CRC, so a mixed old/new room falls back to OpenBIOS or refuses; a session from an old host still accepts any retail dump. The lobby server relays bios_offer and match_caps as opaque objects, so it needs no change. The rule lives in netplay_bios_settle.c, shared by the online and LAN paths and covered by netplay_bios_settle_test. last_error grows to fit one sentence, with psx_lobby_set_last_error to set it.
84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
/* netplay_bios_settle.h — which BIOS every peer boots for a netplay match.
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*
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* Each seat offers what it can boot: the bundled OpenBIOS and/or one retail
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* image, named by the CRC-32 of the file it would actually load. The host
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* settles one BIOS for the room from those offers and sends the result to
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* every peer, which then boots only that image.
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*
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* The wire token for retail is still "scph1001" so older peers read it, but it
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* means "the retail image named by retail_crc", not SCPH-1001. Before this rule
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* the token was the whole identity: an SCPH-5552 peer and an SCPH-1001 peer
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* both offered "scph1001", each booted its own dump, and the rollback boot
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* digest never matched.
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*
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* Rule (netplay_bios_settle):
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* 1. Retail is possible only when every seat offered a retail image and all
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* the CRCs are equal. A seat with no offer, no dump, or no CRC (an older
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* client) makes retail impossible.
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* 2. Retail wins when it is possible and the host prefers it, or when nobody
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* prefers OpenBIOS.
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* 3. Otherwise OpenBIOS, when every seat that sent an offer links it. A seat
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* with no offer is an older client and is assumed to link it, as before.
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* 4. Otherwise retail, if it is possible.
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* 5. Otherwise there is no BIOS every seat can boot: the host must not start.
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*/
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#ifndef NETPLAY_BIOS_SETTLE_H
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#define NETPLAY_BIOS_SETTLE_H
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#include <stddef.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 NetplayBiosSeat {
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int offered; /* 0 = no offer received (older client / not ready) */
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int can_openbios; /* links the bundled OpenBIOS backend */
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int can_retail; /* has a retail dump a linked backend accepts */
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int prefer_openbios; /* the player picked OpenBIOS */
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uint32_t retail_crc; /* CRC-32 of the retail file it would boot; 0 = not sent */
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int is_host;
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} NetplayBiosSeat;
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enum {
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NETPLAY_BIOS_OPENBIOS = 0,
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NETPLAY_BIOS_RETAIL = 1,
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NETPLAY_BIOS_NONE = 2 /* no BIOS every seat can boot */
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};
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typedef struct NetplayBiosSettle {
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int kind; /* NETPLAY_BIOS_* */
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uint32_t retail_crc; /* RETAIL: the image every seat boots */
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/* NONE: two seats that cannot share a retail image (-1 when unused).
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* seat_b is -1 when seat_a simply has no usable retail offer. */
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int seat_a;
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int seat_b;
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} NetplayBiosSettle;
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NetplayBiosSettle netplay_bios_settle(const NetplayBiosSeat *seats, int count);
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/* Wire token for a settled kind: "openbios", "scph1001" (retail), or "". */
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const char *netplay_bios_token(int kind);
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/* retail_crc on the wire: eight lowercase hex digits, "" for 0. */
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void netplay_bios_format_crc(uint32_t crc, char *out, size_t cap);
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/* Parses eight hex digits (surrounding spaces allowed). Returns 0 for
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* anything else, which callers treat as "not sent". */
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uint32_t netplay_bios_parse_crc(const char *text);
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/* Short player-facing name for a retail image CRC ("SCPH-5552"), or the CRC
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* in hex ("BIOS d786f0b9") when the image is not in psx_bios_known_images.h. */
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void netplay_bios_describe_crc(uint32_t crc, char *out, size_t cap);
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/* One line explaining a NONE result, for the launcher's status line. */
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void netplay_bios_describe_refusal(const NetplayBiosSettle *s,
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const NetplayBiosSeat *seats, int count,
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char *out, size_t cap);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NETPLAY_BIOS_SETTLE_H */
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