1 files changed, 39 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/CPP/7zip/Common/OffsetStream.cpp b/other-licenses/7zstub/src/CPP/7zip/Common/OffsetStream.cpp
new file mode 100644
index 000000000..3b01c7f65
--- /dev/null
+++ b/other-licenses/7zstub/src/CPP/7zip/Common/OffsetStream.cpp
@@ -0,0 +1,39 @@
+// OffsetStream.cpp
+
+#include "StdAfx.h"
+
+#include "../../Common/Defs.h"
+
+#include "OffsetStream.h"
+
+HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)
+{
+  _offset = offset;
+  _stream = stream;
+  return _stream->Seek(offset, STREAM_SEEK_SET, NULL);
+}
+
+STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
+{
+  return _stream->Write(data, size, processedSize);
+}
+
+STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
+{
+  UInt64 absoluteNewPosition;
+  if (seekOrigin == STREAM_SEEK_SET)
+  {
+    if (offset < 0)
+      return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
+    offset += _offset;
+  }
+  HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);
+  if (newPosition)
+    *newPosition = absoluteNewPosition - _offset;
+  return result;
+}
+
+STDMETHODIMP COffsetOutStream::SetSize(UInt64 newSize)
+{
+  return _stream->SetSize(_offset + newSize);
+}