bsdiff vc工程

Binary diff/patch utility version 4.3, written by Copyright 2003-2005 Colin Percival <cperciva@freebsd.org> bzip2/libbzip2 version 1.0.4 of 20 December 2006 Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org> This is a quick native Win32-Port by Andreas John <dynacore@tesla.inka.de> ------------------------------------------------------------------------- Quick overview from the homepage of these tools: http://www.daemonology.net/bsdiff/ Binary diff/patch utility bsdiff and bspatch are tools for building and applying patches to binary files. By using suffix sorting (specifically, Larsson and Sadakane's qsufsort) and taking advantage of how executable files change, bsdiff routinely produces binary patches 50-80% smaller than those produced by Xdelta, and 15% smaller than those produced by .RTPatch (a $2750/seat commercial patch tool). These programs were originally named bdiff and bpatch, but the large number of other programs using those names lead to confusion; I'm not sure if the "bs" in refers to "binary software" (because bsdiff produces exceptionally small patches for executable files) or "bytewise subtraction" (which is the key to how well it performs). Feel free to offer other suggestions. bsdiff and bspatch use bzip2; by default they assume it is in /usr/bin. bsdiff is quite memory-hungry. It requires max(17*n,9*n+m)+O(1) bytes of memory, where n is the size of the old file and m is the size of the new file. bspatch requires n+m+O(1) bytes. bsdiff runs in O((n+m) log n) time; on a 200MHz Pentium Pro, building a binary patch for a 4MB file takes about 90 seconds. bspatch runs in O(n+m) time; on the same machine, applying that patch takes about two seconds. Providing that off_t is defined properly, bsdiff and bspatch support files of up to 2^61-1 = 2Ei-1 bytes. -------------------------------------------------------------------------