# libSceCompanionHttpd technical debt

### Unknown function info

- [sceCompanionHttpdOptParamInitialize, sceCompanionHttpdInitialize](../../../core/libs/prx/libSceCompanionHttpd/Export.cpp) (libSceCompanionHttpd) - the option block is taken as 0x60 bytes: titles fill a work memory pointer at +0x08, its size at +0x10 and a temporary data mount point at +0x58 after `sceCompanionHttpdOptParamInitialize`. Its other fields and the defaults the console writes are unknown, so `sceCompanionHttpdOptParamInitialize` zeroes the 0x60 bytes and `sceCompanionHttpdInitialize` reads none of them; both reject a null block with `INVALID_PARAM`
- [sceCompanionHttpdAddHeader, sceCompanionHttpdSetStatus, sceCompanionHttpdSetBody](../../../core/libs/prx/libSceCompanionHttpd/Export.cpp) (libSceCompanionHttpd) - imported by PS4 titles and added without an implementation. They fill the response of a request callback, which is never called here, so every call throws
- [sceCompanionHttpdGet2ndScreenStatus, sceCompanionHttpdGetUserId, sceCompanionHttpdInitialize2, sceCompanionHttpdRegisterRequestBodyReceptionCallback, sceCompanionHttpdRegisterRequestCallback2, sceCompanionHttpdUnregisterRequestBodyReceptionCallback](../../../core/libs/prx/libSceCompanionHttpd/Export.cpp) (libSceCompanionHttpd) - the rest of the library's exports, declared without parameters and without an implementation; their signatures are not verified, so every call throws

### Functional

- [Companion server state](../../../core/libs/prx/libSceCompanionHttpd/Export.cpp) (libSceCompanionHttpd) - no HTTP server listens, so no companion device ever connects: `sceCompanionHttpdGetEvent` returns `NO_EVENT` without writing the event and the request callback is never called. Initialization, callback registration and start and stop are tracked with the errors of shadPS4's [companion_error.h](https://github.com/shadps4-emu/shadPS4/blob/eb9f66c349ae7c8fef780f4f55e98b8065947e14/src/core/libraries/companion/companion_error.h) (`ALREADY_REGISTERED` is 0x80E4000C, between `NOT_STARTED` and `NOT_CONNECTED`; the header has 0x80E4000, one digit short). Unregistering with no callback and terminating a started server throw, since the console's answers are unknown. Not measured on a console. Closes when: a companion server is hosted