windowscodecs: Fixed loading png from streams.
Png decoder was making one extra seek after it met IEND chunk. This led to crashes of some software. Signed-off-by: Viktor Semykin <thesame.ml@gmail.com> Signed-off-by: Vincent Povirk <vincent@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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@ -774,11 +774,12 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
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/* Find the metadata chunks in the file. */
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/* Find the metadata chunks in the file. */
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seek.QuadPart = 8;
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seek.QuadPart = 8;
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hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, &chunk_start);
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if (FAILED(hr)) goto end;
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do
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do
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{
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{
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hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, &chunk_start);
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if (FAILED(hr)) goto end;
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hr = read_png_chunk(pIStream, chunk_type, NULL, &chunk_size);
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hr = read_png_chunk(pIStream, chunk_type, NULL, &chunk_size);
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if (FAILED(hr)) goto end;
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if (FAILED(hr)) goto end;
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@ -816,8 +817,6 @@ static HRESULT WINAPI PngDecoder_Initialize(IWICBitmapDecoder *iface, IStream *p
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}
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}
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seek.QuadPart = chunk_start.QuadPart + chunk_size + 12; /* skip data and CRC */
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seek.QuadPart = chunk_start.QuadPart + chunk_size + 12; /* skip data and CRC */
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hr = IStream_Seek(pIStream, seek, STREAM_SEEK_SET, &chunk_start);
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if (FAILED(hr)) goto end;
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} while (memcmp(chunk_type, "IEND", 4));
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} while (memcmp(chunk_type, "IEND", 4));
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This->stream = pIStream;
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This->stream = pIStream;
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@ -306,7 +306,7 @@ static IWICBitmapDecoder *create_decoder(const void *image_data, UINT image_size
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zero.QuadPart = 0;
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zero.QuadPart = 0;
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IStream_Seek (stream, zero, STREAM_SEEK_CUR, &pos);
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IStream_Seek (stream, zero, STREAM_SEEK_CUR, &pos);
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todo_wine ok(pos.QuadPart < image_size, "seek beyond the end of stream: %x%08x >= %x\n",
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ok(pos.QuadPart < image_size, "seek beyond the end of stream: %x%08x >= %x\n",
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(UINT)(pos.QuadPart >> 32), (UINT)pos.QuadPart, image_size);
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(UINT)(pos.QuadPart >> 32), (UINT)pos.QuadPart, image_size);
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refcount = IStream_Release(stream);
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refcount = IStream_Release(stream);
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