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7 lines
2.4 KiB
Markdown
7 lines
2.4 KiB
Markdown
# libScePlayGo technical debt
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### Unknown function info
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- [libScePlayGo](../../../core/libs/prx/libScePlayGo/Export.cpp) - the chunk set comes from `playgo-chunkdefs.xml` (every listed chunk plus chunks 0 through the default chunk), otherwise from `sce_sys/playgo-chunk.dat`, whose `plgx` header is read as holding the chunk count as a 16-bit value at offset 0x0A and ids 0 to count - 1 are taken as valid. The field was identified on four dumps, where exactly that many 0x20-byte entries follow from offset 0x100 (RIDE 4 PPSA01599: 35, Persona 5 Royal PPSA05110: 25, LEGO Horizon Adventures PPSA14632 and Kena PPSA01802: 1); the rest of the format is not decoded and ids are assumed to be contiguous. Every listed chunk is reported as installed (`LOCAL_FAST`). Without either file, a package with `sce_sys/playgo-scenario.json` (PPSA01748, whose dump lists no chunks) accepts every chunk id as installed while `scePlayGoGetChunkId` lists only chunk 0. A package with no `playgo-*` file in `sce_sys` (PPSA03001, PPSA03490 and PPSA01285 here) accepts chunk 0; querying any other id throws with a message naming the missing `playgo-chunk.dat` and `playgo-scenario.json`, since the incomplete dump cannot establish whether that id exists; `APS5_PLAYGO_UNLISTED_CHUNKS=installed` answers every such id as installed (`LOCAL_FAST`, which PPSA15388 needs to load its saves) and `=absent` answers `SCE_PLAYGO_ERROR_BAD_CHUNK_ID` (which ends PPSA03001's id walk), as the user's choice for that dump. A `sce_sys` that holds other `playgo-*` files (`playgo-ficm.dat`, `playgo-hash-table.dat`) without `playgo-chunk.dat` or `playgo-scenario.json`, or a `playgo-chunk.dat` without a `plgx` header and a nonzero count, throws naming the file, because no such dump is known. These answers are unverified on a console, as is the console's answer for an id outside a package's chunk table.
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- [libScePlayGo](../../../core/libs/prx/libScePlayGo/Export.cpp) - `scePlayGoGetSupportedOptionalChunk` and `scePlayGoGetOptionalChunk` report every bit set for any `type`, i.e. every optional chunk (language pack) supported and installed, like `scePlayGoGetLanguageMask`. The bit layout and the values of `type` are not known; PPSA01748 calls both with type 0 and hides every text language listed in `playgo-scenario.json` `chunkSupportedLanguages` when the bitmask is 0. The console's answer for a package that ships no optional chunks is unverified.
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