--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/Archive/Common/InStreamWithCRC.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,40 @@
+// 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 = CrcUpdate(_crc, 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 = CrcUpdate(_crc, 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 = CRC_INIT_VAL;
+  return _stream->Seek(offset, seekOrigin, newPosition);
+}