Hoffmann & Baron, LLP
Windowing by prefix matching
A method for computing matching windows for delta compression. The method computes pairs of matching source and target data segments irrespective of target data segment size or file offset. The method includes (1) representing a large source data file by a sequence of fixed-size segments; (2) computing a signature for each data segment using its contents such that, with a strong likelihood, two segments are the same if their signatures match; (3) parsing target data using a prefix matching method on such a sequence of signatures of source data to compute matching sequences of segments; and (4) merging closely matched segments as necessary to form matching windows.
AT&T Intellectual Property II, L.P.
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