Commits on Jun 1, 2024

1. Support Zip archives not starting at zero offset …

   Zip archives are usually read from the back to the front, making it
   possible to append them to other files (e.g. executables) in order to
   provide some kind of embedded filesystem.
   
   We can actually extract the start of the archive by looking at the
   central directory offset, by comparing the specified and the actual file
   offset.
   
   The Zip64 format adds another challenge as the EOCD locator specifies
   the offset to the EOCD starting from the beginning of the archive. Such
   relative offset cannot be directly used for archives not starting at
   position zero, hence the addition of another step that tries to locate
   the 64bit EOCD right before the EOCD locator. The added overhead is
   pretty small (and could be made smaller by reading both the presumed
   EOCD and EOCD locator at once) and works pretty well for 90% of the
   archives I've tested it with, if that heuristic fails the old behaviour
   is preserved.

   

   LemonBoy committed Jun 1, 2024
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