FILTERS(2)
NAME
deflate, inflate − data processing modules
SYNOPSIS
include "filter.m";
deflate := load Filter "/dis/lib/deflate.dis"; inflate := load Filter "/dis/lib/inflate.dis";
DESCRIPTION
This page describes the currently implemented data-processing filters conforming to the Filter module interface. For details of the interface, see filter(2).
deflate Deflate implements gzip-compatible stream compression. The param string argument to start can contain one or more of the following option characters:
‘d’ Enable debugging output. Each line of debugging output is provided in an Rq.Info message.
‘v’ Enable verbose mode. Each line of verbose output is provided in an Rq.Info message.
‘h’ Add a gzip header and footer to the data. With this flag, the data after filtering will be in exactly the same format as a gzip file, with accompanying checksum.
‘0’ to ‘9’
Specifies the level of compression to be used (9 highest). See gzip(1).
inflate Inflate performs the inverse operation to deflate. If the param argument to start begins with the character ‘h’ then the input to the filter is assumed to be in the standard gzip file format; the output will be checked for integrity. While processing, the Rq.Info message is used to transmit some information; the type of information is determined by the first word of msg, as follows:
file The rest of msg (after a following space) is the name of the original filename before compression.
mtime
The rest of msg (after a following space) is the modification time of the original file before compression.
SOURCE
/appl/lib/deflate.b
/appl/lib/inflate.b