Support thumbnails in archives

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Currently displaying thumbnails from documents packed in archives is not supported while many image management tools like XnView support it. Extracting thumbnails from solid archives where the complete archive content is packed as one big file can take a very long time. For this reason a new function should be added to the packer plug-in interface.

int PackerGetArchiveType (char* archiveName);

Packers who don't support this function automatically don't support thumbnails in archives.

This would allow options like

  • Enable thumbs in archives
  • Enable thumbs even in solid archives

The 2nd option could support "by filetype options". These means I could allow thumbnail extraction only for SQX archives but not for RAR archives (for example) and only for files smaller 20 MB.

A simpler option which just limits the archive size would also be okay.

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