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COCOON
2008
Springer

Damaged BZip Files Are Difficult to Repair

14 years 2 months ago
Damaged BZip Files Are Difficult to Repair
bzip is a program written by Julian Seward that is often used under Unix to compress single files. It splits the file into blocks which are compressed individually using a combination of the Burrows-Wheeler-Transformation, the Move-To-Front algorithm, Huffman and Runlength encoding. The author himself stated that compressed blocks that are damaged, i.e., part of which are lost, are essentially non-recoverable. This paper gives a formal proof that this is indeed true: focusing on the Burrows-Wheeler-Transformation, the problem of completing a transformed string, such that the decoded string obeys certain file format restrictions, is NP-hard.
Christian Hundt, Ulf Ochsenfahrt
Added 18 Oct 2010
Updated 18 Oct 2010
Type Conference
Year 2008
Where COCOON
Authors Christian Hundt, Ulf Ochsenfahrt
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