Storing differences between precompressed and recompressed data files

摘要

A system comprises a processor and a memory. The processor is configured to decompress a precompressed file; recompress the decompressed file; and determine a difference file. The memory is coupled to the processor and configured to provide the processor with instructions.

主权项

1. A system for storage and retrieval of a precompressed file, comprising:
a processor configured to:
decompress a precompressed file into a decompressed input file, wherein the precompressed file was generated using a first compression;recompress the decompressed input file using a second compression into a recompressed file;determine a difference file comprising one or more differences between the precompressed file and the recompressed file;store the decompressed input file in a deduplicating storage system, wherein the deduplicating storage system breaks the decompressed input file into segments and stores only the segments that have been determined to not already been stored in the deduplicating storage system;reconstruct the decompressed input file using the segments from the deduplicating storage system into a reconstructed decompressed input file;recompress the reconstructed decompressed input file using the second compression into an output recompressed file;retract the one or more differences in the output recompressed file using the difference file in order to restore the precompressed file; and a memory coupled to the processor and configured to provide the processor with instructions.