[PATCH v2 1/4] dmstyle: Parse a 'prth' chunk with missing dwFlags in DMUS_IO_STYLEPART

[Michael Stefaniuc]

From: Michael Stefaniuc

Not documented in the official headers but multiple pre-DX8 games have
the DMUS_IO_STYLEPART without the dwFlags.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58493
---
 dlls/dmstyle/style.c | 9 ++++++++-
 include/dmusicf.h    | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/dlls/dmstyle/style.c b/dlls/dmstyle/style.c
index c64e7e3d525..baf2cb22e7c 100644
--- a/dlls/dmstyle/style.c
+++ b/dlls/dmstyle/style.c
@@ -482,7 +482,14 @@ static HRESULT parse_part_list(struct style *This, IStream *stream, struct chunk
         switch (MAKE_IDTYPE(chunk.id, chunk.type))
         {
         case DMUS_FOURCC_PART_CHUNK:
-            hr = stream_chunk_get_data(stream, &chunk, &part->header, sizeof(part->header));
+            if (chunk.size != sizeof(part->header) &&
+                    chunk.size != ((offsetof(DMUS_IO_STYLEPART, bPad) + 1 ) & ~1)) /* DX7 */
+            {
+                WARN("Invalid size of %s\n", debugstr_chunk(&chunk));
+                hr = E_FAIL;
+                break;
+            }
+            hr = stream_chunk_get_data(stream, &chunk, &part->header, chunk.size);
             break;

case MAKE_IDTYPE(FOURCC_LIST, DMUS_FOURCC_UNFO_LIST):
diff --git a/include/dmusicf.h b/include/dmusicf.h
index da8363c4b04..24b8c585bfe 100644
--- a/include/dmusicf.h
+++ b/include/dmusicf.h
@@ -516,6 +516,7 @@ struct _DMUS_IO_STYLEPART {
    BYTE            bPlayModeFlags;
    BYTE            bInvertUpper;
    BYTE            bInvertLower;
+	/* DX8 */
    BYTE            bPad[3];
    DWORD           dwFlags;
 };