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-rw-r--r--other-licenses/7zstub/src/CPP/7zip/Common/OffsetStream.cpp39
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);
+}