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# tcl::transform::zlib(n) 1.1 tcllib "Reflected/virtual channel support"

## Name

tcl::transform::zlib - zlib (de)compression

## Synopsis

- package require Tcl 8.6 9
- package require tcl::transform::core ?1.1?
- package require tcl::transform::zlib ?1.1?

- ::tcl::transform::zlib chan ?level?

## Description

The tcl::transform::zlib package provides a command creating a channel transformation which zlib compresses the written data, and decompresses on reading.

The internal TclOO class implementing the transform handler is a sub-class of the tcl::transform::core framework.

## API

::tcl::transform::zlib chan ?level?

  This command creates a zlib compressor transformation on top of the channel chan and returns its handle.

  The level specifies how much effort is put into the compression, from 0 to 9, and defaults to 4.

## Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category virtchannel of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide unified diffs, i.e the output of diff -u.

Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.

## Keywords

channel transformation, compression, decompression, reflected channel, tip 230, tip 234, transformation, virtual channel, zlib

## Category

Channels

## Copyright

Copyright © 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>