1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
[manpage_begin base64 n 2.4.2]
[copyright {2000, Eric Melski}]
[copyright {2001, Miguel Sofer}]
[moddesc {Text encoding & decoding binary data}]
[titledesc {base64-encode/decode binary data}]
[category {Text processing}]
[require Tcl 8]
[require base64 [opt 2.4.2]]
[description]
[para]
This package provides procedures to encode binary data into base64 and back.
[list_begin definitions]
[call [cmd ::base64::encode] [opt "[option -maxlen] [arg maxlen]"] [opt "[option -wrapchar] [arg wrapchar]"] [arg string]]
Base64 encodes the given binary [arg string] and returns the encoded
result. Inserts the character [arg wrapchar] every [arg maxlen]
characters of output. [arg wrapchar] defaults to newline. [arg maxlen]
defaults to [const 76].
[para]
[emph {Note well}]: If your string is not simple ascii you should fix
the string encoding before doing base64 encoding. See the examples.
[para]
The command will throw an error for negative values of [arg maxlen],
or if [arg maxlen] is not an integer number.
[call [cmd ::base64::decode] [arg "string"]]
Base64 decodes the given [arg "string"] and returns the binary data.
The decoder ignores whitespace in the string.
[list_end]
[section {EXAMPLES}]
[example {
% base64::encode "Hello, world"
SGVsbG8sIHdvcmxk
}]
[example {
% base64::encode [string repeat xyz 20]
eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6
eHl6eHl6eHl6
% base64::encode -wrapchar "" [string repeat xyz 20]
eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6eHl6
}]
[example {
# NOTE: base64 encodes BINARY strings.
% set chemical [encoding convertto utf-8 "C\u2088H\u2081\u2080N\u2084O\u2082"]
% set encoded [base64::encode $chemical]
Q+KCiEjigoHigoBO4oKET+KCgg==
% set caffeine [encoding convertfrom utf-8 [base64::decode $encoded]]
}]
[section {BUGS, IDEAS, FEEDBACK}]
This document, and the package it describes, will undoubtedly contain
bugs and other problems.
Please report such in the category [emph base64] of the
[uri {http://sourceforge.net/tracker/?group_id=12883} {Tcllib SF Trackers}].
Please also report any ideas for enhancements you may have for either
package and/or documentation.
[keywords encoding base64]
[manpage_end]
|
