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// 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)
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