1 files changed, 95 insertions, 0 deletions

diff --git a/CPP/Common/CrcReg.cpp b/CPP/Common/CrcReg.cpp
new file mode 100644
index 0000000..fdbba77
--- /dev/null
+++ b/CPP/Common/CrcReg.cpp
@@ -0,0 +1,95 @@
+// CrcReg.cpp
+
+#include "StdAfx.h"
+
+#include "../../C/7zCrc.h"
+#include "../../C/CpuArch.h"
+
+#include "../Common/MyCom.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);
+
+UInt32 MY_FAST_CALL CrcUpdateT1(UInt32 v, const void *data, size_t size, const UInt32 *table);
+
+extern CRC_FUNC g_CrcUpdate;
+extern CRC_FUNC g_CrcUpdateT4;
+extern CRC_FUNC g_CrcUpdateT8;
+extern CRC_FUNC g_CrcUpdateT0_32;
+extern CRC_FUNC g_CrcUpdateT0_64;
+
+EXTERN_C_END
+
+class CCrcHasher:
+  public IHasher,
+  public ICompressSetCoderProperties,
+  public CMyUnknownImp
+{
+  UInt32 _crc;
+  CRC_FUNC _updateFunc;
+  Byte mtDummy[1 << 7];
+  
+  bool SetFunctions(UInt32 tSize);
+public:
+  CCrcHasher(): _crc(CRC_INIT_VAL) { SetFunctions(0); }
+
+  MY_UNKNOWN_IMP2(IHasher, ICompressSetCoderProperties)
+  INTERFACE_IHasher(;)
+  STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
+};
+
+bool CCrcHasher::SetFunctions(UInt32 tSize)
+{
+  CRC_FUNC f = NULL;
+       if (tSize ==  0) f = g_CrcUpdate;
+  else if (tSize ==  1) f = CrcUpdateT1;
+  else if (tSize ==  4) f = g_CrcUpdateT4;
+  else if (tSize ==  8) f = g_CrcUpdateT8;
+  else if (tSize == 32) f = g_CrcUpdateT0_32;
+  else if (tSize == 64) f = g_CrcUpdateT0_64;
+  
+  if (!f)
+  {
+    _updateFunc = g_CrcUpdate;
+    return false;
+  }
+  _updateFunc = f;
+  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;
+}
+
+STDMETHODIMP_(void) CCrcHasher::Init() throw()
+{
+  _crc = CRC_INIT_VAL;
+}
+
+STDMETHODIMP_(void) CCrcHasher::Update(const void *data, UInt32 size) throw()
+{
+  _crc = _updateFunc(_crc, data, size, g_CrcTable);
+}
+
+STDMETHODIMP_(void) CCrcHasher::Final(Byte *digest) throw()
+{
+  UInt32 val = CRC_GET_DIGEST(_crc);
+  SetUi32(digest, val);
+}
+
+REGISTER_HASHER(CCrcHasher, 0x1, "CRC32", 4)