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authorDavid Kalnischkies <david@kalnischkies.de>2015-08-28 19:26:44 +0200
committerDavid Kalnischkies <david@kalnischkies.de>2015-08-28 19:26:44 +0200
commitd7a51997c30b2098bb60b3397095ec58ec825303 (patch)
treef8dd90f51359b998983f7bb01afa20d1d9c22f0c /doc/method.dbk
parent79b60dcd78e6cb4c842c98ed5ba5be469a8181be (diff)
implement PDiff patching for compressed files
Some additional files like 'Contents' are very big and should therefore kept compressed on the disk, which apt-file did in the past. It also implemented pdiff patching of these files by un- and recompressing these files on-the-fly, with this commit we can do the same – but we can do this in both pdiff patching styles (client and server merging) and secured by hashes. Hashes are in so far slightly complicated as we can't compare the hashes of the compressed files as we might compress them differently than the server would (different compressor versions, options, …), so we must compare the hashes of the uncompressed content. While this commit has changes in public headers, the classes it changes are marked as hidden, so nobody can use them directly, which means the ABI break is internal only.
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