[PATCH 2/8] windowscodecs/metadata: Add an option to initialize reader from a memory block.

[Nikolay Sivov]

From: Nikolay Sivov

Signed-off-by: Nikolay Sivov 
---
 dlls/windowscodecs/decoder.c           |  7 +++++++
 dlls/windowscodecs/wincodecs_private.h | 11 ++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/dlls/windowscodecs/decoder.c b/dlls/windowscodecs/decoder.c
index ea8bb2d75bb..d956ed149ce 100644
--- a/dlls/windowscodecs/decoder.c
+++ b/dlls/windowscodecs/decoder.c
@@ -638,6 +638,13 @@ static HRESULT WINAPI CommonDecoderFrame_Block_GetReaderByIndex(IWICMetadataBloc
             if (SUCCEEDED(hr))
                 hr = IWICStream_Seek(stream, offset, STREAM_SEEK_SET, NULL);
         }
+        else if (This->metadata_blocks[nIndex].options & DECODER_BLOCK_OFFSET_IS_PTR)
+        {
+            BYTE *data = (BYTE *)(ULONG_PTR)This->metadata_blocks[nIndex].offset;
+            UINT size = This->metadata_blocks[nIndex].length;
+
+            hr = IWICStream_InitializeFromMemory(stream, data, size);
+        }
         else
         {
             ULARGE_INTEGER offset, length;
diff --git a/dlls/windowscodecs/wincodecs_private.h b/dlls/windowscodecs/wincodecs_private.h
index c255df06f84..d9493b5607e 100644
--- a/dlls/windowscodecs/wincodecs_private.h
+++ b/dlls/windowscodecs/wincodecs_private.h
@@ -290,9 +290,14 @@ struct decoder_frame
     WICColor palette[256];
 };

-#define DECODER_BLOCK_OPTION_MASK 0x0001000F
-#define DECODER_BLOCK_FULL_STREAM 0x80000000
-#define DECODER_BLOCK_READER_CLSID 0x40000000
+enum decoder_block_options
+{
+    DECODER_BLOCK_OPTION_MASK = 0x0001000F,
+    DECODER_BLOCK_FULL_STREAM = 0x80000000,
+    DECODER_BLOCK_READER_CLSID = 0x40000000,
+    DECODER_BLOCK_OFFSET_IS_PTR = 0x20000000,
+};
+
 struct decoder_block
 {
     ULONGLONG offset;