Attempting to re-create / replicate an archive made years ago with an unknown application, which is no longer complete on a file-sharing network

This page summarizes the projects mentioned and recommended in the original post on reddit.com/r/compression

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  • precomp-cpp

    Precomp, C++ version - further compress already compressed files

    https://github.com/schnaader/precomp-cpp Maybe some tools posted in https://encode.su/threads/1399-reflate-a-new-universal-deflate-recompressor Maybe something has to be developed specifically for your task.

  • XADMaster

    Objective-C library for archive and file unarchiving and extraction

    Rar would compress them with plain LZ, there's nothing special for jpegs there. However Winzip has a special codec for jpegs - that could be a problem. https://github.com/MacPaw/XADMaster/tree/master/WinZipJPEG

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  • xdelta

    open-source binary diff, delta/differential compression tools, VCDIFF/RFC 3284 delta compression

  • HDiffPatch

    a C\C++ library and command-line tools for Diff & Patch between binary files or directories(folder); cross-platform; run fast; create small delta/differential; support large files and limit memory requires when diff & patch.

    I'd suggest to just try other diff programs, eg. https://github.com/sisong/HDiffPatch

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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