diff options
Diffstat (limited to 'CPP/Common/CrcReg.cpp')
-rw-r--r-- | CPP/Common/CrcReg.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/CPP/Common/CrcReg.cpp b/CPP/Common/CrcReg.cpp new file mode 100644 index 00000000..6f4de495 --- /dev/null +++ b/CPP/Common/CrcReg.cpp @@ -0,0 +1,111 @@ +// CrcReg.cpp + +#include "StdAfx.h" + +#include "../../C/7zCrc.h" +#include "../../C/CpuArch.h" + +#include "../Common/MyCom.h" + +#include "../7zip/ICoder.h" +#include "../7zip/Common/RegisterCodec.h" + +EXTERN_C_BEGIN + +typedef UInt32 (MY_FAST_CALL *CRC_FUNC)(UInt32 v, const void *data, size_t size, const UInt32 *table); + +extern CRC_FUNC g_CrcUpdate; + +#ifdef MY_CPU_X86_OR_AMD64 + UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table); +#endif + +#ifndef MY_CPU_BE + UInt32 MY_FAST_CALL CrcUpdateT4(UInt32 v, const void *data, size_t size, const UInt32 *table); +#endif + +EXTERN_C_END + +class CCrcHasher: + public IHasher, + public ICompressSetCoderProperties, + public CMyUnknownImp +{ + UInt32 _crc; + CRC_FUNC _updateFunc; + bool SetFunctions(UInt32 tSize); +public: + CCrcHasher(): _crc(CRC_INIT_VAL) { SetFunctions(0); } + + MY_UNKNOWN_IMP1(ICompressSetCoderProperties) + + STDMETHOD_(void, Init)(); + STDMETHOD_(void, Update)(const void *data, UInt32 size); + STDMETHOD_(void, Final)(Byte *digest); + STDMETHOD_(UInt32, GetDigestSize)(); + STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps); +}; + +STDMETHODIMP_(void) CCrcHasher::Init() +{ + _crc = CRC_INIT_VAL; +} + +STDMETHODIMP_(void) CCrcHasher::Update(const void *data, UInt32 size) +{ + _crc = _updateFunc(_crc, data, size, g_CrcTable); +} + +STDMETHODIMP_(void) CCrcHasher::Final(Byte *digest) +{ + UInt32 val = CRC_GET_DIGEST(_crc); + SetUi32(digest, val); +} + +STDMETHODIMP_(UInt32) CCrcHasher::GetDigestSize() +{ + return 4; +} + +bool CCrcHasher::SetFunctions(UInt32 tSize) +{ + _updateFunc = g_CrcUpdate; + if (tSize == 4) + { + #ifndef MY_CPU_BE + _updateFunc = CrcUpdateT4; + #endif + } + else if (tSize == 8) + { + #ifdef MY_CPU_X86_OR_AMD64 + _updateFunc = CrcUpdateT8; + #else + return false; + #endif + } + return true; +} + +STDMETHODIMP CCrcHasher::SetCoderProperties(const PROPID *propIDs, + const PROPVARIANT *coderProps, UInt32 numProps) +{ + for (UInt32 i = 0; i < numProps; i++) + { + const PROPVARIANT &prop = coderProps[i]; + if (propIDs[i] == NCoderPropID::kDefaultProp) + { + if (prop.vt != VT_UI4) + return E_INVALIDARG; + if (!SetFunctions(prop.ulVal)) + return E_NOTIMPL; + } + } + return S_OK; +} + +static IHasher *CreateHasher() { return new CCrcHasher(); } + +static CHasherInfo g_HasherInfo = { CreateHasher, 0x1, L"CRC32", 4 }; + +REGISTER_HASHER(Crc32) |