03-25-2008
unpack is a tool, you can invent basically any format which is suitable for your needs and it will be fairly easy to encode and decode.
base64 looks like this:
SSB3aXNoIHlvdSBjb3VsZCB0cnkgdGhpcyB5b3Vyc2VsZgo=
It's what's used inside email messages for attachments if you "view source" (or are old enough to telnet to your IMAP server :-)
quoted-printable replaces any non-ascii with an escape code, consisting of an equals sign and a hex code, =3Dlike this=3D (just to give you an idea).
You really need to give more details to work on, or just pick one.
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base64(n) Text encoding & decoding binary data base64(n)
__________________________________________________________________________________________________________________________________________________
NAME
base64 - base64-encode/decode binary data
SYNOPSIS
package require Tcl 8
package require base64 ?2.4?
::base64::encode ?-maxlen maxlen? ?-wrapchar wrapchar? string
::base64::decode string
_________________________________________________________________
DESCRIPTION
This package provides procedures to encode binary data into base64 and back.
::base64::encode ?-maxlen maxlen? ?-wrapchar wrapchar? string
Base64 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 60.
Note well: If your string is not simple ascii you should fix the string encoding before doing base64 encoding. See the examples.
The command will throw an error for negative values of maxlen, or if maxlen is not an integer number.
::base64::decode string
Base64 decodes the given string and returns the binary data. The decoder ignores whitespace in the string.
EXAMPLES
% base64::encode "Hello, world"
SGVsbG8sIHdvcmxk
% base64::encode [string repeat xyz 20]
eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6
eHl6eHl6eHl6
% base64::encode -wrapchar "" [string repeat xyz 20]
eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6
# NOTE: base64 encodes BINARY strings.
% set chemical [encoding convertto utf-8 "Cu2088Hu2081u2080Nu2084Ou2082"]
% set encoded [base64::encode $chemical]
Q+KCiEjigoHigoBO4oKET+KCgg==
% set caffeine [encoding convertfrom utf-8 [base64::decode $encoded]]
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 SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
KEYWORDS
base64, encoding
COPYRIGHT
Copyright (c) 2000, Eric Melski
Copyright (c) 2001, Miguel Sofer
base64 2.4 base64(n)