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12 lines
1.7 KiB
Markdown
12 lines
1.7 KiB
Markdown
# libSceConvertKeycode technical debt
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### Unknown function info
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- [sceConvertKeycodeGetCharacter](../../../core/libs/prx/libSceConvertKeycode/Export.cpp) (libSceConvertKeycode) - the signature `(uint16_t keycode, uint32_t, uint32_t keyboardType, char16_t* character)` is inferred from PPSA12361, which passes a 16-bit keycode, 0, the type from `sceConvertKeycodeGetImeKeyboardType` and a pointer it reads one UTF-16 unit from when the result is 0. The meaning of the second argument is unknown. PPSA02530 (#5726) and PPSA27836 pass `0x4000000` as a constant: PPSA27836 calls it for every keycode from 0 to 0x8F to build a table of key names, upper-cases `a` to `z` itself and skips keycodes that fail or return 0, so that bit is ignored and the unshifted character is returned as for 0. Any other bit throws, and so does a keyboard type other than 0. The returned character for HID usage `0x64` has not been measured on a console; `\` is an unverified US-layout guess based on the Windows VK mapping, which does not establish the console result.
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### Functional
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- [sceConvertKeycodeGetCharacter](../../../core/libs/prx/libSceConvertKeycode/Export.cpp) (libSceConvertKeycode) takes the keycode as a USB HID keyboard usage and returns the unshifted character of the US layout for letters, digits, punctuation, space and the keypad. A keycode without a character returns 0 with the character 0; whether the console returns an error instead is not measured.
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- `sceConvertKeycodeGetVirtualKeycode`: HID-to-virtual-key mappings and the three-argument signature are confirmed. Layouts 31–39 and version-dependent Y/Z mappings for layouts 2, 3 and 12 throw until the guest platform and compiled SDK version are exposed; no version is guessed.
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