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=52147Signed-off-by: Torge Matthies <openglfreak@googlemail.com> Signed-off-by: Esme Povirk <esme@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

windowscodecs: Disable libpng chunk size limit.
e1130d24 · Torge Matthies · Alexandre Julliard · 2abf0173 · e1130d24 · e1130d24
Commit e1130d24 authored Dec 03, 2021 by Torge Matthies Committed by Alexandre Julliard Dec 06, 2021
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libpng.c dlls/windowscodecs/libpng.c +1 -0

pngformat.c dlls/windowscodecs/tests/pngformat.c +1 -1

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--- 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);

--- 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);