1 files changed, 41 insertions, 0 deletions
diff --git a/CPP/7zip/Archive/Common/InStreamWithCRC.cpp b/CPP/7zip/Archive/Common/InStreamWithCRC.cpp
new file mode 100755
index 00000000..74dff7e1
--- /dev/null
+++ b/CPP/7zip/Archive/Common/InStreamWithCRC.cpp
@@ -0,0 +1,41 @@
+// InStreamWithCRC.cpp
+
+#include "StdAfx.h"
+
+#include "InStreamWithCRC.h"
+
+STDMETHODIMP CSequentialInStreamWithCRC::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  UInt32 realProcessedSize;
+  HRESULT result = _stream->Read(data, size, &realProcessedSize);
+  _size += realProcessedSize;
+  if (size > 0 && realProcessedSize == 0)
+    _wasFinished = true;
+  _crc.Update(data, realProcessedSize);
+  if(processedSize != NULL)
+    *processedSize = realProcessedSize;
+  return result;
+}
+
+STDMETHODIMP CInStreamWithCRC::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  UInt32 realProcessedSize;
+  HRESULT result = _stream->Read(data, size, &realProcessedSize);
+  if (size > 0 && realProcessedSize == 0)
+    _wasFinished = true;
+  _size += realProcessedSize;
+  _crc.Update(data, realProcessedSize);
+  if(processedSize != NULL)
+    *processedSize = realProcessedSize;
+  return result;
+}
+
+STDMETHODIMP CInStreamWithCRC::Seek(Int64 offset, 
+    UInt32 seekOrigin, UInt64 *newPosition)
+{
+  if (seekOrigin != STREAM_SEEK_SET || offset != 0)
+    return E_FAIL;
+  _size = 0;
+  _crc.Init();
+  return _stream->Seek(offset, seekOrigin, newPosition);
+}