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NAME

ascii85 - ascii85-encode/decode binary data

Table Of Contents

SYNOPSIS

package require Tcl 8.4
package require ascii85 ?1.0?

::ascii85::encode ?-maxlen maxlen? ?-wrapchar wrapchar? string
::ascii85::decode string

DESCRIPTION

This package provides procedures to encode binary data into ascii85 and back.

EXAMPLES

% ascii85::encode "Hello, world"
87cURD_*#TDfTZ)

% ascii85::encode [string repeat xyz 24]
G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G
^4U[H$X^\H?a^]
% ascii85::encode -wrapchar "" [string repeat xyz 24]
G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]G^4U[H$X^\H?a^]

# NOTE: ascii85 encodes BINARY strings.
% set chemical [encoding convertto utf-8 "C\u2088H\u2081\u2080N\u2084O\u2082"]
% set encoded [ascii85::encode $chemical]
6fN]R8E,5Pidu\UiduhZidua
% set caffeine [encoding convertfrom utf-8 [ascii85::decode $encoded]]

References

  1. http://en.wikipedia.org/wiki/Ascii85

  2. Postscript Language Reference Manual, 3rd Edition, page 131. http://www.adobe.com/devnet/postscript/pdfs/PLRM.pdf

Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category base64 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

ascii85, encoding

CATEGORY

Text processing

COPYRIGHT

Copyright © 2010, Emiliano Gavil├ín