Compress files on NAS

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ns_zlib

ns_zlib(3aolserver)					     AOLserver Zlib Extension					       ns_zlib(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME

       ns_zlib - Zlib compression support

SYNOPSIS

       ns_zlib compress string
       ns_zlib gunzip file
       ns_zlib gzip string
       ns_zlib gzipfile file
       ns_zlib uncompress string
_________________________________________________________________

DESCRIPTION

       The  ns_zlib command enables compressing and uncompressing of strings or files.	The command is available if the nszlib.so module is loaded
       into AOLserver or the libnszlib.so, nszlib.dll, or libnszlib.dylib dynamic library is loaded using the load command  in	a  suitable  tclsh
       such as nstclsh.

       ns_zlib compress string
	      This command compresses the given string and returns a Tcl byte array object with the compressed data.

       ns_zlib gunzip file
	      This command uncompresses the contents of the given gzipped file and returns a string as the result.

       ns_zlib gzipfile file
	      This  command is similar to the gzip shell routines, compressing the given file into a new file with the .gz extension.  If success-
	      ful, the original uncompressed file is deleted.

       ns_zlib uncompress bytearray
	      This command takes a byte array object which includes compressed data and returns an uncompressed string object.

EXAMPLES

       The following examples demonstrate compressing and uncompressing a string;

	      # Compress Tcl string
	      set test "This is test string"
	      set data [ns_zlib compress $test]
	      set test [ns_zlib uncompress $data]
	      --> returns "This is test string"

	      # Compress the string into gzip format
	      set gzip [ns_zlib gzip $test]

	      # Save as gzip file
	      set fd [open /tmp/test.gz w]
	      fconfigure $fd -translation binary -encoding binary
	      puts -nonewline $fd $gzip
	      close $fd

	      # Uncompress gzipped file
	      set test [ns_zlib gunzip /tmp/test.gz]
	      --> returns "This is test string"

SEE ALSO

       ns_adp_ctl(n), load(n)

KEYWORDS

       GZIP, compress, uncompress

AOLserver								4.5						       ns_zlib(3aolserver)

Filesystems, Disks and Memory