6 lines
1.4 KiB
Markdown
6 lines
1.4 KiB
Markdown
# libSceZlib technical debt
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### Functional
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- [libSceZlib](../../../core/libs/prx/libSceZlib/Export.cpp) completes RFC1950 decompression during submission and supports one outstanding request, null-timeout waits and one result retrieval. Timed waits, multiple outstanding requests, repeated retrieval and finalization with an unread result throw. The 64-bit initialization length and 64 KiB output limit with 2 KiB destination alignment follow [SharpProspero](https://github.com/SvenGDK/SharpProspero/blob/5dfdb4b0b166e83dc9ae275001afb695f12c7174/src/SharpProspero/Interop/Compression/Zlib.cs); the PS4 initialization length is 32 bits. shadPS4 also requires the output length to be a multiple of 2 KiB and returns `0x81120016` for invalid arguments; this implementation accepts any length up to 64 KiB (SharpProspero documents only the pointer alignment) and throws on invalid arguments. Scratch memory is not used, and its firmware size/alignment requirements are unknown. The initialization errors follow SharpProspero; malformed/checksum/truncated streams report `0x811200FF` and insufficient output `0x8112001C` as in [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/0fe263a4760dfbfa973366890061749b4af0de97/src/core/libraries/zlib/zlib.cpp). PS5 error precedence, scheduling, completion selection, result consumption and cancellation are unverified. The payload SDK's FreeBSD kernel `z_stream` and host errno are not this library's ABI.
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