compression method
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... Compresses data with efficiency comparable to the best
currently available general-purpose compression methods,
and in particular considerably better than the "compress"
program; ...
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The specification specifies a compression method and a file format
(the latter assuming only that a file can store a sequence of
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... CM (Compression Method)
This identifies the compression method used in the file. CM
= 0-7 are reserved. CM ...
... CM = 8 denotes the "deflate"
compression method, which is the one customarily used by
gzip and which is documented elsewhere.
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XFL (eXtra FLags)
These flags are available for use by specific compression
methods. The "deflate" method (CM ...
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Any data compression method involves the reduction of redundancy in
the data. Consequently, any corruption of the data is likely to have
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