ascii85(n) [mojave man page]

ascii85(n)					       Text encoding & decoding binary data						ascii85(n)

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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 "Cu2088Hu2081u2080Nu2084Ou2082"]
       % set encoded [ascii85::encode $chemical]
       6fN]R8E,5PiduUiduhZidua
       % 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 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

       ascii85, encoding

CATEGORY

       Text processing

COPYRIGHT

       Copyright (c) 2010, Emiliano Gavilan

base64									1.0								ascii85(n)

base32(n)							  Base32 encoding							 base32(n)

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NAME

       base32 - base32 standard encoding

SYNOPSIS

       package require Tcl  8.4

       package require base32::core  ?0.1?

       package require base32  ?0.1?

       ::base32::encode string

       ::base32::decode estring

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DESCRIPTION

       This package provides commands for encoding and decoding of strings into and out of the standard base32 encoding as specified in RFC 3548.

API

       ::base32::encode string
	      This  command  encodes  the  given  string in base32 and returns the encoded string as its result. The result may be padded with the
	      character = to signal a partial encoding at the end of the input string.

       ::base32::decode estring
	      This commands takes the estring and decodes it under the assumption that it is a valid base32 encoded  string.  The  result  of  the
	      decoding is returned as the result of the command.

	      Note that while the encoder will generate only uppercase characters this decoder accepts input in lowercase as well.

	      The command will always throw an error whenever encountering conditions which signal some type of bogus input, namely if

	      [1]    the input contains characters which are not valid output of a base32 encoder,

	      [2]    the length of the input is not a multiple of eight,

	      [3]    padding appears not at the end of input, but in the middle,

	      [4]    the padding has not of length six, four, three, or one characters,

CODE MAP

       The code map used to convert 5-bit sequences is shown below, with the numeric id of the bit sequences to the left and the character used to
       encode it to the right. It should be noted that the characters "0" and "1" are not used by the encoding. This is done as  these	characters
       can be easily confused with "O", "o" and "l" (L).

	    0 A    9 J	 18 S	27 3
	    1 B   10 K	 19 T	28 4
	    2 C   11 L	 20 U	29 5
	    3 D   12 M	 21 V	30 6
	    4 E   13 N	 22 W	31 7
	    5 F   14 O	 23 X
	    6 G   15 P	 24 Y
	    7 H   16 Q	 25 Z
	    8 I   17 R	 26 2

BUGS, IDEAS, FEEDBACK
       This  document,	and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category base32
       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

       base32, rfc3548

CATEGORY

       Text processing

COPYRIGHT

       Copyright (c) Public domain

base32									0.1								 base32(n)