zlib-flate(1) [centos man page]

ZLIB-FLATE(1)							   User Commands						     ZLIB-FLATE(1)

NAME

       zlib-flate - raw zlib compression program

SYNOPSIS

       zlib-flate -compress | -uncompress

DESCRIPTION

       The zlib-flate program is part of the qpdf package.

       The zlib-flate program reads from standard input and writes to standard output either compressing or uncompressing its input using raw zlib
       compression.  It can be used to uncompress or compress raw PDF streams or other data that is compressed with raw  zlib  compression.   This
       program is provided primarily as a debugging tool, though it could be used for other purposes, such as being called from a script that cre-
       ates simple PDF files.

       This program should not be used as a general purpose compression tool.  Use something like gzip(1) instead.

       For details about qpdf, please see the qpdf manual, which can be found in qpdf-doc package.

SEE ALSO

       qpdf(1), gzip(1)

zlib-flate from qpdf version 5.0.1				    April 2008							     ZLIB-FLATE(1)

GZENCODE(3)								 1							       GZENCODE(3)

gzencode - Create a gzip compressed string

SYNOPSIS

       string gzencode (string	$data, [int  $level = -1], [int  $encoding_mode = FORCE_GZIP])

DESCRIPTION

	This function returns a compressed version of the input $data compatible with the output of the gzip program.

	For more information on the GZIP file format, see the document: GZIP file format specification version 4.3 (RFC 1952).

PARAMETERS

	      o $data
		- The data to encode.

	      o $level
		-  The	level of compression. Can be given as 0 for no compression up to 9 for maximum compression. If not given, the default com-
		pression level will be the default compression level of the zlib library.

	      o $encoding_mode
		- The encoding mode. Can be FORCE_GZIP (the default) or FORCE_DEFLATE.	Prior to PHP 5.4.0, using FORCE_DEFLATE results in a stan-
		dard zlib deflated string (inclusive zlib headers) after a gzip file header but without the trailing crc32 checksum.  In PHP 5.4.0
		and later, FORCE_DEFLATE generates RFC 1950 compliant output, consisting of a zlib header, the deflated data, and an Adler  check-
		sum.

RETURN VALUES

	The encoded string, or FALSE if an error occurred.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.4.0	|						    |
       |	|						    |
       |	|						    |
       |	| FORCE_DEFLATE  now  generates  RFC 1950 compliant |
       |	| output.					    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

	The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.:

       Example #1

	      Creating a gzip file

	      <?php
	      $data = implode("", file("bigfile.txt"));
	      $gzdata = gzencode($data, 9);
	      $fp = fopen("bigfile.txt.gz", "w");
	      fwrite($fp, $gzdata);
	      fclose($fp);
	      ?>

SEE ALSO

       gzdecode(3), gzdeflate(3), gzinflate(3), gzuncompress(3), gzcompress(3),  ZLIB Compressed Data Format Specification (RFC 1950) .

PHP Documentation Group 													       GZENCODE(3)