[Chicken-janitors] #258: z3 egg improvements

[Chicken Trac]

#258: z3 egg improvements
-------------------------+--------------------------------------------------
 Reporter:  zbigniew     |       Owner:  zbigniew
     Type:  enhancement  |      Status:  new     
 Priority:  minor        |   Milestone:  4.6.0   
Component:  extensions   |     Version:  4.5.x   
 Keywords:  z3           |  
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 z3 implements RFC1951 (deflate) and RFC1952 (gzip) but not RFC1950 (zlib),
 which is basically deflate + a header and adler32 checksum.  zlib format
 is used by some applications in lieu of a raw deflate stream -- for
 example, git objects are stored in this format.  The default python and
 ruby zlib compression functions read and write zlib format as well,
 relegating raw deflate to second class status.  That's probably because
 this is the standard behavior of libz itself, but support seems warranted.

 Also as in closed ticket #82, the interface should be improved to be more
 agnostic to input or output source, allowing any format to be read or
 written to a port or string. Backward compatibility should be retained
 where possible.

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Ticket URL: <http://www.irp.oist.jp/trac/chicken/ticket/258>
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