Torge Matthies : windowscodecs: Disable libpng chunk size limit.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: e1130d240e8a3ff05c814dd8a2d6e55b3f054e5c
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=e1130d240e8a3ff05c814dd8a...

Author: Torge Matthies <openglfreak(a)googlemail.com>
Date:   Fri Dec  3 21:26:16 2021 +0100

windowscodecs: Disable libpng chunk size limit.

Reading a PNG file with libpng with a chunk bigger than the 8 MiB
default chunk size limit set by libpng results in a libpng error, e.g.
"iTXt: chunk data is too large" for a too big iTXt chunk.

Fix this by disabling the chunk size limit.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52147
Signed-off-by: Torge Matthies <openglfreak(a)googlemail.com>
Signed-off-by: Esme Povirk <esme(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/windowscodecs/libpng.c          | 1 +
 dlls/windowscodecs/tests/pngformat.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/windowscodecs/libpng.c b/dlls/windowscodecs/libpng.c
index 27a735550f3..8e876b23efe 100644
--- a/dlls/windowscodecs/libpng.c
+++ b/dlls/windowscodecs/libpng.c
@@ -107,6 +107,7 @@ static HRESULT CDECL png_decoder_initialize(struct decoder *iface, IStream *stre
         goto end;
     }
     png_set_crc_action(png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
+    png_set_chunk_malloc_max(png_ptr, 0);
 
     /* seek to the start of the stream */
     hr = stream_seek(stream, 0, STREAM_SEEK_SET, NULL);
diff --git a/dlls/windowscodecs/tests/pngformat.c b/dlls/windowscodecs/tests/pngformat.c
index b44fd017fcf..32afc989c2b 100644
--- a/dlls/windowscodecs/tests/pngformat.c
+++ b/dlls/windowscodecs/tests/pngformat.c
@@ -944,7 +944,7 @@ static void test_chunk_size(void)
     memcpy(png_8M_tEXt + sizeof(png_8M_tEXt) - sizeof(png_8M_tEXt_end), png_8M_tEXt_end, sizeof(png_8M_tEXt_end));
 
     hr = create_decoder(png_8M_tEXt, sizeof(png_8M_tEXt), &decoder);
-    todo_wine ok(hr == S_OK, "Failed to load PNG image data %#x\n", hr);
+    ok(hr == S_OK, "Failed to load PNG image data %#x\n", hr);
     if (hr != S_OK) return;
 
     IWICBitmapDecoder_Release(decoder);