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base32::core(n)                                Base32 encoding                               base32::core(n)



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NAME
       base32::core - Expanding basic base32 maps

SYNOPSIS
       package require Tcl  8.4

       package require base32::core  ?0.1?

       ::base32::core::define map forwvar backwvar ivar

       ::base32::core::valid string pattern mvar

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DESCRIPTION
       This package provides generic commands for the construction of full base32 mappings from a basic map-ping mapping
       ping listing just the codes and associated characters. The full mappings, regular and  inverse,  cre-ated created
       ated here map to and from bit sequences, and also handle the partial mappings at the end of a string.

       This is in essence an internal package to be used by implementors of a base32 en- and decoder. A reg-ular regular
       ular user has no need of this package at all.

API
       ::base32::core::define map forwvar backwvar ivar
              This  command  computes  full  forward  and backward (inverse) mappings from the basic map and
              stores them in the variables named by forwvar and backwvar resp. It also constructs  a  regexp
              pattern  for the detection of invalid characters in supposedly base32 encoded input and stores
              it in the variable named by ivar.

       ::base32::core::valid string pattern mvar
              This command checks if the input string is a valid base32 encoded string, based on the pattern
              of invalid characters as generated by ::base32::core::define, and some other general rules.

              The  result  of the command is a boolean flag. Its value is True for a valid string, and False
              otherwise. In the latter case an error message describing the problem with the input is stored
              into  the  variable  named  by  mvar. The variable is not touched if the input was found to be
              valid.

              The rules checked by the command, beyond rejection of bad characters, are:

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

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

              [3]    The padding has not of length six, four, three, or one characters,


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://source -
       forge.net/tracker/? group_id=12883].  Please also report any ideas for enhancements you may  have  for
       either package and/or documentation.

KEYWORDS
       base32

CATEGORY
       Text processing

COPYRIGHT
       Copyright (c) Public domain




base32                                               0.1                                     base32::core(n)