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lilith
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Apr 13, 2026
Three valid interlaced GIFs (7x7, 9x9, 47x63) produced by gifsicle 1.95 are rejected with "image truncated". All decode correctly with giftopnm (netpbm) and are valid per the GIF89a spec. Root cause: when decoding interlaced frames, read_into_buffer passes per-row slices to the LZW decoder. For small images (7-47 byte rows), weezl's NoProgress status triggers two bugs in DecodeSubBlock: 1. Input data is skipped instead of retried with a smaller buffer 2. NoProgress during flush is treated as end-of-stream Related: image-rs/weezl#72
lilith
added a commit
to lilith/image-gif
that referenced
this pull request
Apr 13, 2026
Three valid interlaced GIFs (7x7, 9x9, 47x63) produced by gifsicle 1.95 are rejected with "image truncated". All decode correctly with giftopnm (netpbm) and are valid per the GIF89a spec. Root cause: when decoding interlaced frames, read_into_buffer passes per-row slices to the LZW decoder. For small images (7-47 byte rows), weezl's NoProgress status triggers two bugs in DecodeSubBlock: 1. Input data is skipped instead of retried with a smaller buffer 2. NoProgress during flush is treated as end-of-stream Related: image-rs/weezl#72
lilith
added a commit
to lilith/image-gif
that referenced
this pull request
Apr 13, 2026
Three valid interlaced GIFs (7x7, 9x9, 47x63) produced by gifsicle 1.95 are rejected with "image truncated". All decode correctly with giftopnm (netpbm) and are valid per the GIF89a spec. Root cause: when decoding interlaced frames, read_into_buffer passes per-row slices to the LZW decoder. For small images (7-47 byte rows), weezl's NoProgress status triggers two bugs in DecodeSubBlock: 1. Input data is skipped instead of retried with a smaller buffer 2. NoProgress during flush is treated as end-of-stream Related: image-rs/weezl#72
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