Editing ZIP (file format) (section)

==== Seek-optimized (SOZip) profile ====

A Seek-Optimized ZIP file (SOZip) profile<ref>{{cite web|last1=Rouault|first1=Even (OSGeo)|url=https://github.com/sozip/sozip-spec/blob/master/sozip_specification.md|format=markdown|title=Seek-optimized ZIP (SOZip) profile|website=github.com|access-date=2023-01-11}}</ref> has been proposed for the ZIP format. Such file contains one or several Deflate-compressed files that are organized and annotated such that a SOZip-aware reader can perform very fast random access (seek) within a compressed file. SOZip makes it possible to access large compressed files directly from a .zip file without prior decompression. It combines the use of ZLib block flushes issued at regular interval with a hidden index file mapping offsets of the uncompressed file to offsets in the compressed stream. ZIP readers that are not aware of that extension can read a SOZip-enabled file normally and ignore the extended features that support efficient seek capability.