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3294fac462
Signed-off-by: B. Watson <yalhcru@gmail.com> Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>
27 lines
1.3 KiB
Text
27 lines
1.3 KiB
Text
bsdiff (binary diff/patch utility)
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bsdiff and bspatch are tools for building and applying patches to
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binary files. By using suffix sorting (specifically, Larsson and
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Sadakane's qsufsort) and taking advantage of how executable files
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change, bsdiff routinely produces binary patches 50-80% smaller than
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those produced by Xdelta, and 15% smaller than those produced by
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.RTPatch (a $2750/seat commercial patch tool).
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These programs were originally named bdiff and bpatch, but
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the large number of other programs using those names lead to
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confusion; I'm not sure if the "bs" in refers to "binary software"
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(because bsdiff produces exceptionally small patches for executable
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files) or "bytewise subtraction" (which is the key to how well it
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performs). Feel free to offer other suggestions.
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bsdiff is quite memory-hungry. It requires max(17*n,9*n+m)+O(1) bytes
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of memory, where n is the size of the old file and m is the size of
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the new file. bspatch requires n+m+O(1) bytes.
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bsdiff runs in O((n+m) log n) time; on a 200MHz Pentium Pro, building
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a binary patch for a 4MB file takes about 90 seconds. bspatch runs in
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O(n+m) time; on the same machine, applying that patch takes about two
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seconds.
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Providing that off_t is defined properly, bsdiff and bspatch support
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files of up to 2^61-1 = 2Ei-1 bytes.
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