[PATCH 05/12] windowscodecs: Support Seek for memory streams in IWICStream
Tony Wasserka
tony.wasserka at freenet.de
Tue Aug 18 08:18:54 CDT 2009
---
dlls/windowscodecs/stream.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/dlls/windowscodecs/stream.c b/dlls/windowscodecs/stream.c
index fb48896..c2a87f9 100644
--- a/dlls/windowscodecs/stream.c
+++ b/dlls/windowscodecs/stream.c
@@ -109,8 +109,23 @@ static HRESULT WINAPI StreamOnMemory_Write(IStream *iface,
static HRESULT WINAPI StreamOnMemory_Seek(IStream *iface,
LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER *plibNewPosition)
{
- FIXME("(%p): stub\n", iface);
- return E_NOTIMPL;
+ StreamOnMemory *This = (StreamOnMemory*)iface;
+ LARGE_INTEGER NewPosition;
+ TRACE("(%p)\n", This);
+
+ if (dlibMove.QuadPart > 0xFFFFFFFF) return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
+
+ if (dwOrigin == STREAM_SEEK_SET) NewPosition.QuadPart = dlibMove.QuadPart;
+ else if (dwOrigin == STREAM_SEEK_CUR) NewPosition.QuadPart = This->dwCurPos + dlibMove.QuadPart;
+ else if (dwOrigin == STREAM_SEEK_END) NewPosition.QuadPart = This->dwMemsize + dlibMove.QuadPart;
+ else return E_INVALIDARG;
+
+ if (NewPosition.QuadPart > This->dwMemsize) return E_INVALIDARG;
+ if (NewPosition.QuadPart < 0) return E_INVALIDARG;
+ This->dwCurPos = NewPosition.LowPart;
+
+ if(plibNewPosition) plibNewPosition->QuadPart = This->dwCurPos;
+ return S_OK;
}
/* SetSize isn't implemented in the native windowscodecs DLL either */
--
1.6.3.3
--------------090505090303010209070601--
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