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LibGfx/WebP: Add two spec comments

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Nico Weber 2024-04-15 09:12:27 -04:00 committed by Tim Schumacher
parent def486305a
commit 04c6af7dfd
Notes: sideshowbarker 2024-07-17 04:34:25 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/04c6af7dfd
Pull-request: https://github.com/SerenityOS/serenity/pull/23972
Reviewed-by: https://github.com/timschumi ✅
1 changed files with 3 additions and 0 deletions
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Userland/Libraries/LibGfx/ImageFormats/WebPLoaderLossless.cpp
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@ -388,8 +388,11 @@ static ErrorOr<NonnullRefPtr<Bitmap>> decode_webp_chunk_VP8L_image(ImageKind ima
};
while (pixel < end) {
// "For the current position (x, y) in the image, the decoder first identifies the corresponding prefix code group"
auto const& group = prefix_group(pixel);
// "Next, read the symbol S from the bitstream using prefix code #1.
// Note that S is any integer in the range 0 to (256 + 24 + color_cache_size - 1)."
auto symbol = TRY(group[0].read_symbol(bit_stream));
if (symbol >= 256u + 24u + color_cache_size)
return Error::from_string_literal("WebPImageDecoderPlugin: Symbol out of bounds");