Commits on Feb 18, 2024

1. Fix decoding error with trailing comment extension blocks …

   The GIF files that can be found on the Internet come in a wide variety
   of forms. Some strictly adhere to the original specification, others do
   not and differ in the actual sequence of blocks or their number.
   
   For this reason, my decoder has a kind of "virtual" FrameBlock, which
   can contain all possible blocks in different order that occur in a GIF
   animation.
   
   - Graphic Control Extension
   - Image Description
   - Local Color Table
   - Image Data Block
   - Plain Text Extension
   - Application Extension
   - Comment Extension
   
   The TableBasedImage block, which is a chain of ImageDescriptor, (Local
   Color Table) and ImageData, is used as a feature for terminating a
   FrameBlock.
   
   So far I have only seen GIF files that follow this scheme. However,
   there was one example where one (or more) comment extensions were added
   before the end. Here the decoding process failed.
   
   This fix also adds "global comments" that are not part of my FrameBlock
   and are appended to the GifDataStream afterwards.

   

   olivervogel committed Feb 18, 2024
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2. Fix doc block

   

   olivervogel committed Feb 18, 2024
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3. Add test for GifDataStream::addComment()

   

   olivervogel committed Feb 18, 2024
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