HEX number grouping Post: 302477220

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LEARN ABOUT OSX

base32hex

base32::hex(n)							  Base32 encoding						    base32::hex(n)

__________________________________________________________________________________________________________________________________________________

NAME

       base32::hex - base32 extended hex encoding

SYNOPSIS

       package require Tcl  8.4

       package require base32::core  ?0.1?

       package require base32::hex  ?0.1?

       ::base32::hex::encode string

       ::base32::hex::decode estring

_________________________________________________________________

DESCRIPTION

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

API

       ::base32::hex::encode string
	      This command encodes the given string in extended hex 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::hex::decode estring
	      This  commands  takes  the  estring  and	decodes it under the assumption that it is a valid extended hex 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 extended hex 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. The important feature of the extended hex mapping is that the first 16 codes map to the digits and hex characters.

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

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, hex, rfc3548

CATEGORY

       Text processing

COPYRIGHT

       Copyright (c) Public domain

base32									0.1							    base32::hex(n)