Provided by: tcllib_1.19-dfsg-2_all 
NAME
ascii85 - ascii85-encode/decode binary data
SYNOPSIS
package require Tcl 8.4
package require ascii85 ?1.0?
::ascii85::encode ?-maxlen maxlen? ?-wrapchar wrapchar? string
::ascii85::decode string
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DESCRIPTION
This package provides procedures to encode binary data into ascii85 and back.
::ascii85::encode ?-maxlen maxlen? ?-wrapchar wrapchar? string
Ascii85 encodes the given binary string and returns the encoded result. Inserts the character
wrapchar every maxlen characters of output. wrapchar defaults to newline. maxlen defaults to 76.
Note well: If your string is not simple ascii you should fix the string encoding before doing
ascii85 encoding. See the examples.
The command will throw an error for negative values of maxlen, or if maxlen is not an integer
number.
::ascii85::decode string
Ascii85 decodes the given string and returns the binary data. The decoder ignores whitespace in
the string, as well as tabs and newlines.
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 [http://core.tcl.tk/tcllib/reportlist]. 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 (c) 2010, Emiliano Gavilán