compression
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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; ...
...
The specification specifies a compression method and a file format
(the latter assuming only that a file can store a sequence of
...
... 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.
...
... local rather than Universal time.) If the compressed data
did not come from a file, MTIME is set to the time at which
compression started. MTIME = 0 means no time stamp is
available.
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XFL (eXtra FLags)
These flags are available for use by specific compression
methods. The "deflate" method (CM ...
... Operating System)
This identifies the type of file system on which compression
took place. This may be useful in determining end-of-line
convention for text files. The currently defined values are
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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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The most widely used implementation of gzip compression, and the
original documentation on which this specification is based, were
created ...