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d49b521972
already have zlib, but it seems it wants a special (old?) zlib that supports "old-style compress" in order for regular -z to work.
32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
READ THIS BEFORE TRYING TO DYNAMICALLY LINK RSYNC AND ZLIB!
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zlib has been adapted slightly for use in rsync. Please don't bother
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the zlib authors with problems related to the use of zlib in rsync as
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any bugs are likely to be our fault and not theirs.
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Specific changes that have been made to zlib for rsync include:
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- add Z_INSERT_ONLY to allow for efficient history updating without
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actually emitting any data. This is used to compress the matched
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blocks that don't cross the wire, which gives better compression
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ratios on the literal data.
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- fixed a number of minor compilation issues. (redefinition of MAX and
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other such trivial things)
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- include rsync.h to ensure that we get a consistent set of includes
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for all C code in rsync and to take advantage of autoconf
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As a result of the first item, the streams from rsync's version of
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zlib are *not compatible* with those produced by the upstream version
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of rsync. In other words, if you link rsync against your system's
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copy, it will not be able to interoperate with any other version if
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the -z option is used. (Sorry. Sometimes standard is better than
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better.)
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The rsync maintainers hope to fix this problem in the future by either
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merging our changes into the upstream version, or backing them out of
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rsync in a way that preserves wire compatibility. But in the meantime
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this version must be maintained in parallel.
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