This file is indexed.

/usr/share/perl5/Math/BaseCnv.pm is in libmath-basecnv-perl 1.14-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# 315J9mLT:Math::BaseCnv.pm by PipStuart <Pip@CPAN.Org> to CoNVert between arbitrary number Bases. I'm totally addicted to bass!
package    Math::BaseCnv;
use strict;use  warnings;use utf8;
require     Exporter ;
use base qw(Exporter);
use Math::BigInt;
use Memoize;memoize('summ');memoize('fact');memoize('choo');
use Carp; # only export cnv() for 'use Math::BaseCnv;' && all other stuff optionally
our @EXPORT      =             qw(cnv                                                       )  ;
our @EXPORT_OK   =             qw(    dec heX HEX b10 b64 b64sort dig diginit summ fact choo)  ;
our %EXPORT_TAGS = ( 'all' =>[ qw(cnv dec heX HEX b10 b64 b64sort dig diginit summ fact choo) ],
                     'heX' =>[ qw(cnv dec heX HEX                                           ) ],
                     'b64' =>[ qw(cnv             b10 b64 b64sort                           ) ],
                     'dig' =>[ qw(                                dig diginit               ) ],
                     'sfc' =>[ qw(                                            summ fact choo) ] );
our $VERSION     = '1.14';our $d8VS='G7UM6iSk';
my $d2bs='';my %bs2d=();my $nega='';
my %digsets = (
  'usr' => [], # this will be assigned if a dig(\@newd) call is made
  'bin' => ['0', '1'],
  'dna' => ['a', 'c', 'g', 't'],
  'DNA' => ['A', 'C', 'G', 'T'],
  'oct' => ['0'..'7'],
  'dec' => ['0'..'9'],
  'heX' => ['0'..'9', 'a'..'f'],
  'HEX' => ['0'..'9', 'A'..'F'],
  'b36' => ['0'..'9', 'a'..'z'],
  'B36' => ['0'..'9', 'A'..'Z'],
  'b62' => ['0'..'9', 'a'..'z', 'A'..'Z'],
  'b64' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_'], # month:C:12 day:V:31
  'm64' => ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'], # 0-63 from MIME::Base64
  'iru' => ['A'..'Z', 'a'..'z', '0'..'9', '[', ']'], # P10 server-server protocol used by IRCu daemon
  'url' => ['A'..'Z', 'a'..'z', '0'..'9', '-', '_'], # MIME::Base64::URLSafe which avoids %2B && %2F expansions of '+' && '/' respectively
  'rgx' => ['A'..'Z', 'a'..'z', '0'..'9', '!', '-'], # ReGular eXpression variant
  'id0' => ['A'..'Z', 'a'..'z', '0'..'9', '_', '-'], # IDentifier style 0
  'id1' => ['A'..'Z', 'a'..'z', '0'..'9', '.', '_'], # IDentifier style 1
  'xnt' => ['A'..'Z', 'a'..'z', '0'..'9', '.', '-'], # XML Name Tokens (Nmtoken)
  'xid' => ['A'..'Z', 'a'..'z', '0'..'9', '_', ':'], # XML identifiers (Name   )
  'sxl' => ['?', '@', 'A'..'Z', '[','\\', ']', '^',  # Sixel Base64 from VT100.Net
            '_', '`', 'a'..'z', '{', '|', '}', '~'],
  'b85' => ['0'..'9', 'A'..'Z', 'a'..'z', '!', '#',  # RFC 1924 for IPv6 addresses like in Math::Base85
            '$', '%', '&', '(', ')', '*', '+', '-', ';', '<', '=', '>', '?', '@', '^', '_', '`', '{', '|', '}', '~'],
  'asc' => [' ', '!', '"', '#', '$', '%', '&', "'",  # Base96 7-bit printable 0x20 (space) - 0x7F (tilde ~) 'ascii' from Math::Base::Convert
            '(', ')', '*', '+', ',', '-', '.', '/', '0'..'9', ':', ';', '<', '=', '>', '?', '@', 'A'..'Z', '[','\\',
            ']', '^', '_', '`', 'a'..'z', '{', '|', '}', '~'],
  'b96' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_',  # Base96 but starting with b64 characters
            ' ', '!', '"', '#', '$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '/', ':', ';', '<', '=', '>', '?',
            '@', '[','\\', ']', '^', '`', '{', '|', '}', '~'],);
sub bs2init { %bs2d=();for(my $i = 0; $i < @{ $digsets{$d2bs} }; $i++){$bs2d{${ $digsets{$d2bs} }[$i]} = $i;}} # build hash of digit chars => array indices
sub diginit { $d2bs='b64';bs2init(); } # reset digit character list to initial default and initialize base to digit hash mapping
sub dig { # assign a new digit character list
  return( @{ $digsets{$d2bs} } ) unless(@_);
  if(ref $_[0]) { $d2bs = 'usr'; $digsets{$d2bs} = [ @{ shift() } ]; }
  else          { my $setn = shift(); return(-1) unless(exists $digsets{$setn}); $d2bs = $setn; }
  diginit() unless(@{ $digsets{$d2bs} });
  bs2init(); }
sub cnv__10 { # convert from some number base to decimal fast
  my $t = shift || '0'; my $s = shift || 64; my $n = Math::BigInt->new();
  $nega = ''; $nega = '-' if($t =~ s/^-//);
  for(split(//, $t)) { return(-1) unless(exists $bs2d{$_}); }
  while(length($t)) { $n += $bs2d{substr($t,0,1,'')}; $n *= $s; }
  return($nega . int($n / $s)); }
sub cnv10__ { # convert from decimal to some number base fast
  my $n = Math::BigInt->new(shift || '0'); my $s = shift || 64; my $t = '';
  return(-1) if($s > @{ $digsets{$d2bs} });
  $nega = ''; $nega = '-' if($n =~ s/^-//);
  while($n) { $t = $digsets{$d2bs}->[($n % $s)] . $t; $n = int($n / $s); }
  if(length($t)) { $t = $nega . $t;           }
  else           { $t = $digsets{$d2bs}->[0]; }
  return($t); }
sub dec     { return(cnv__10(uc(shift), 16)); } # shortcut for hexadecimal -> decimal
sub HEX     { return(cnv10__(   shift,  16)); } # shortcut for decimal     -> HEXADECIMAL
sub heX     { return(lc(HEX(@_))); }            # same as above but lowercase
sub b10     { return(cnv__10(   shift,  64)); } # shortcut for base64      -> decimal
sub b64     { return(cnv10__(   shift,  64)); } # shortcut for decimal     -> base64
sub b64sort { return( map { b64($_) } sort { $a <=> $b } map { b10($_) } @_ ); }
sub cnv     { # CoNVert between any number bases
  my $numb = shift; return(-1) unless(defined($numb) && length($numb));
  my $fbas = shift; my $tbas = shift; my $rslt = ''; my $temp = 0;
  return($digsets{$d2bs}->[0]) if($numb =~ /^-?0+$/); # lots of (negative?) zeros is just zero
  if(!defined($tbas)) { # makeup reasonable values for missing params
    if(!defined($fbas)) {                                                         $fbas =    10; $tbas = 16;
      if   ($numb =~ /^0x/i || ($numb =~ /[A-F]/i && $numb =~ /^[0-9A-F]+$/i )) { $fbas =    16; $tbas = 10; }
      elsif($numb =~                   /[G-Z._]/i && $numb =~ /^[0-9A-Z._]+$/i) { $fbas =    64; $tbas = 10; }
      elsif($numb =~ /\D/) { print "!*EROR*! Can't determine reasonable FromBase && ToBase from number:$numb!\n"; }
    } else                                                                      { $tbas = $fbas; $fbas = 10; }
  }
  $fbas = 16 if($fbas =~ /\D/); $tbas = 10 if($tbas =~ /\D/);
  if($fbas == 16) { $numb =~ s/^0x//i; $numb = uc($numb); }
  return(-1) if($fbas < 2 || $tbas < 2); # invalid base error
  $numb = cnv__10($numb, $fbas) if($numb =~ /\D/ || $fbas != 10);
  $numb = cnv10__($numb, $tbas) if(                 $tbas != 10);
  return($numb);
}
sub summ { # simple function to calculate summation down to 1
  my $summ = shift; return(0) unless(defined($summ) && $summ && ($summ > 0)); my $answ = Math::BigInt->new($summ);while(--$summ){$answ +=$summ;} return($answ);
}
sub fact { # simple function to calculate factorials
  my $fact = shift; return(0) unless(defined($fact) && $fact && ($fact > 0)); my $answ = Math::BigInt->new($fact);while(--$fact){$answ *=$fact;} return($answ);
}
sub choo { # simple function to calculate n choose m  (i.e., (n! / (m! * (n - m)!)))
  my $ennn = Math::BigInt->new(shift); my $emmm = Math::BigInt->new(shift);
  return(0) unless(defined($ennn) && defined($emmm) && $ennn && $emmm && ($ennn != $emmm));
  ($ennn, $emmm) = ($emmm, $ennn) if($ennn < $emmm); my $diff = Math::BigInt->new($ennn - $emmm); my $answ = Math::BigInt->new(fact($ennn));
                                                     my $mfct = Math::BigInt->new( fact(  $emmm));my $dfct = Math::BigInt->new(fact($diff));
  $mfct *= $dfct; return(0) unless($mfct);
  $answ /= $mfct; return($answ);
}
diginit(); # initialize the Dflt digit set whenever BaseCnv is used
8;

=encoding utf8

=head1 NAME

Math::BaseCnv - basic functions to CoNVert between number Bases

=head1 VERSION

This documentation refers to version 1.14 of Math::BaseCnv, which was released on Sat Jul 30 06:44:28:46 -0500 2016.

=head1 SYNOPSIS

  #!/usr/bin/perl
  use strict;use warnings;use utf8;use v5.10;use Math::BaseCnv;

              # CoNVert     63 from base-10 (decimal) to base- 2 (binary )
  my $binary__63 = cnv(     63 , 10,  2 );
              # CoNVert 111111 from base- 2 (binary ) to base-16 (HEX    )
  my $HEX_____63 = cnv( 111111 ,  2, 16 );
              # CoNVert     3F from base-16 (HEX    ) to base-10 (decimal)
  my $decimal_63 = cnv(    '3F', 16, 10 );
  say "63 dec->bin $binary__63 bin->HEX $HEX_____63 HEX->dec $decimal_63";

=head1 DESCRIPTION

BaseCnv provides a few simple functions for converting between arbitrary number bases. You're probably better off using Michael Robinton's
L<Math::Base::Convert> benchmarked high-performance Perl modules. Another object syntax for number-base conversion is Ken Williams'
fine L<Math::BaseCalc> module.

=head1 PURPOSE

The reason I created BaseCnv was that I needed a simple way to convert quickly between the 3 number bases I use most (10, 16, and 64). It turned out
that it was trivial to handle any arbitrary number base that is represented as characters. High-bit ASCII has proven somewhat problemmatic but at least
BaseCnv can simply and reliably convert between any possible base between 2 and 64 (or 96). I'm happy with it and employ b64() in places I probably
shouldn't now.

=head1 USAGE

=head2 cnv($numb[,$from[,$tobs]])

CoNVert the number contained in $numb from its current number base ($from) into the result number base ($tobs).

B<When only $numb is provided as a parameter:>

If $numb only contains valid decimal (base 10) digits, it will be converted to HEXADECIMAL (base 16).

If $numb only contains valid hexadecimal (base 16) digits or begins with '0x', it will be it will be converted to decimal (base 10).

B<When only $numb and $from are provided as parameters:>

cnv() assumes that $numb is already in decimal format and uses $from as the $tobs.

B<When all three parameters are provided:>

The normal (and most clear) usage of cnv() is to provide all three parameters where $numb is converted from $from base to $tobs.

cnv() is the only function that is exported from a normal 'use Math::BaseCnv;' command. The other functions below can be imported to local namespaces
explicitly or with the following tags:

  :all - every function described here
  :heX - only cnv(), dec(), heX(), and HEX()
  :b64 - only cnv(), b10(), b64(), and b64sort()
  :dig - only dig() and diginit()
  :sfc - only summ(), fact(), and choo()

=head2 b10($b64n)

A shortcut to convert the number given as a parameter ($b64n) from base 64 to decimal (base 10).

=head2 b64($b10n)

A shortcut to convert the number given as a parameter ($b10n) from decimal (base 10) to base 64.

=head2 b64sort(@b64s)

A way to sort b64 strings as though they were decimal numbers.

=head2 dec($b16n)

A shortcut to convert the number given as a parameter ($b16n) from hexadecimal (base 16) to decimal (base 10).

=head2 HEX($b10n)

A shortcut to convert the number given as a parameter ($b10n) from decimal (base 10) to HEXADECIMAL (base 16) uppercase.

=head2 heX($b10n)

A shortcut to convert the number given as a parameter ($b10n) from decimal (base 10) to hexadecimal (base 16) lowercase.

Please read the L<"NOTES"> regarding heX().

=head2 dig(\@newd)

Assign the new digit character list to be used in place of the default one. dig() can also alternately accept a string name matching one of the
following predefined digit sets:

  'bin' => ['0', '1'],
  'dna' => ['a', 'c', 'g', 't'],
  'DNA' => ['A', 'C', 'G', 'T'],
  'oct' => ['0'..'7'],
  'dec' => ['0'..'9'],
  'heX' => ['0'..'9', 'a'..'f'],
  'HEX' => ['0'..'9', 'A'..'F'],
  'b36' => ['0'..'9', 'a'..'z'],
  'B36' => ['0'..'9', 'A'..'Z'],
  'b62' => ['0'..'9', 'a'..'z', 'A'..'Z'],
  'b64' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_'], # month:C:12 day:V:31
  'm64' => ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'], # 0-63 from MIME::Base64
  'iru' => ['A'..'Z', 'a'..'z', '0'..'9', '[', ']'], # P10 server-server protocol used by IRCu daemon
  'url' => ['A'..'Z', 'a'..'z', '0'..'9', '-', '_'], # MIME::Base64::URLSafe (avoid %2B %2F expansions)
  'rgx' => ['A'..'Z', 'a'..'z', '0'..'9', '!', '-'], # ReGular eXpression variant
  'id0' => ['A'..'Z', 'a'..'z', '0'..'9', '_', '-'], # IDentifier style 0
  'id1' => ['A'..'Z', 'a'..'z', '0'..'9', '.', '_'], # IDentifier style 1
  'xnt' => ['A'..'Z', 'a'..'z', '0'..'9', '.', '-'], # XML Name Tokens (Nmtoken)
  'xid' => ['A'..'Z', 'a'..'z', '0'..'9', '_', ':'], # XML identifiers (Name   )
  'sxl' => ['?', '@', 'A'..'Z', '[','\\', ']', '^',  # Sixel Base64 from VT100.Net
            '_', '`', 'a'..'z', '{', '|', '}', '~'],
  'b85' => ['0'..'9', 'A'..'Z', 'a'..'z', '!', '#',  # RFC 1924 for IPv6 addresses like in Math::Base85
            '$', '%', '&', '(', ')', '*', '+', '-',
            ';', '<', '=', '>', '?', '@', '^', '_',
            '`', '{', '|', '}', '~'               ],
  'asc' => [' ', '!', '"', '#', '$', '%', '&', "'",  # Base96 7-bit printable 0x20 (space) - 0x7F
            '(', ')', '*', '+', ',', '-', '.', '/',  #   (tilde ~) 'ascii' from Math::Base::Convert
            '0'..'9', ':', ';', '<', '=', '>', '?',
            '@', 'A'..'Z', '[','\\', ']', '^', '_',
            '`', 'a'..'z', '{', '|', '}', '~'     ],
  'b96' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_',  # Base96 but starting with b64 characters
            ' ', '!', '"', '#', '$', '%', '&', "'",
            '(', ')', '*', '+', ',', '-', '/', ':',
            ';', '<', '=', '>', '?', '@', '[','\\',
            ']', '^', '`', '{', '|', '}', '~'     ],

If no \@newd list or digit set name is provided as a parameter, dig() returns the current character list. It's fine to have many more characters
in your current digit set than will be used with your conversions (e.g., using dig('b64') works fine for any cnv() call with $from and $tobs params
less than or equal to 64).

An example of a \@newd parameter for a specified alternate digit set for base 9 conversions is:

  dig( [ qw( n a c h o z   y u m ) ] );

=head2 diginit()

Resets the used digit list to the initial default order of the predefined digit set: 'b64'. This is simply a shortcut for calling dig('b64') for
reinitialization purposes.

=head2 summ($numb)

A simple function to calculate a memoized BigInt summation of $numb down to 1.

=head2 fact($numb)

A simple function to calculate a memoized BigInt factorial of $numb.

=head2 choo($ennn, $emmm)

A simple function to calculate a memoized BigInt function  of $ennn choose $emmm.

=head1 NOTES

The Perl built-in hex() function takes a hex string as a parameter and returns the decimal value (FromBase = 16, ToBase = 10). This notation seems
counter-intuitive to me since I prefer to read the code as though a hex() function will turn your parameter into hexadecimal (i.e., I think hex() should
hexify your parameter but Perl's built-in does not.). I initially decided to invert the notation for my similar functions, but reconsidered the potential
harm possible by introducing exported conflicting opposite behavior into other people's maybe crucial code, so I am falling back on unique casing with heX().

My b64() function takes a decimal number as a parameter and returns the base64 equivalent (FromBase = 10, ToBase = 64) and my b10() function takes a base64
number (string) and returns the decimal value (FromBase = 64, ToBase = 10). My heX() function opposes Perl's built-in hex() (which is similar to my dec()).

Please think of my dec() and heX() functions as meaning decify and heXify. Also the pronunciation of dec() is 'dess' (not 'deck').

Error checking is minimal.

This module does not handle fractional number inputs because I like using the dot (.) character as a standard base64 digit since it makes for clean filenames.

summ(), fact(), and choo() are general Math function utilities which are unrelated to number-base conversion but I didn't feel like making another
separate module just for them so they snuck in here.

I hope you find Math::BaseCnv useful. TTFN.

=head1 CHANGES

Revision history for Perl extension Math::BaseCnv:

=over 2

=item - 1.14 G7UM6iSk  Sat Jul 30 06:44:28:46 -0500 2016

* synchronized README and Changes to updated POD

=item - 1.12 G7OMKBCn  Sun Jul 24 20:11:12:49 -0500 2016

* added digit set 'b96' as a reordering of 'asc'

=item - 1.10 G7OMF3ZT  Sun Jul 24 15:03:35:29 -0500 2016

* added new digit sets from L<Math::Base::Convert>

* switched all old hex() to distinct new heX() and updated POD to reflect

* fixed META license to match POD and resolve issue: L<HTTPS://RT.CPAN.Org/Public/Bug/Display.html?id=60122> (Thanks again xenoterracide.)

* removed PT from VERSION to resolve issue: L<HTTPS://RT.CPAN.Org/Public/Bug/Display.html?id=60275> (Thanks Alexandr.)

=item - 1.8.B59BrZX  Mon May  9 11:53:35:33 2011

* updated 'url' digit set to URLSafe to resolve L<HTTPS://RT.CPAN.Org/Ticket/Display.html?id=60125> (Thanks xenoterracide.)

* updated license copyright years (already had GPLv3)

=item - 1.6.A6FGHKE  Tue Jun 15 16:17:20:14 2010

* bumped minor version number so they'll keep ascending (without PT comprehension)

=item - 1.4.A6FAbEb  Tue Jun 15 10:37:14:37 2010

* added Math::BigInt code for >64-bit number-base conversions

* added a bunch more DigitSets: IRCu, URL, RegEx, identifier variants, XML Nmtoken, and XML ID Name

=item - 1.4.75O6Pbr  Thu May 24 06:25:37:53 2007

* added Test::Pod(::Coverage)? tests and PREREQ entries

* added b85 for IPv6, generated META.yml (with needed newline before EOF) and updated minor version number

=item - 1.2.68J9uJQ  Sat Aug 19 09:56:19:26 2006

* added b64sort() and put POD at bottom

=item - 1.2.59M7mRX  Thu Sep 22 07:48:27:33 2005

* testing Make as primary and BuildPL backup (needing rename for dot)

=item - 1.2.59IBlgw  Sun Sep 18 11:47:42:58 2005

* testing just using Module::Build instead of MakeMaker

* fixed test 12 which was failing on AMD64

* added Build.PL to package

=item - 1.2.54HK3pB  Sun Apr 17 20:03:51:11 2005

* removed 128 digit-set since some high-bit characters cause problems on Win32

* made bin/cnv only executable to go in EXE_FILES

* made Math::BaseCalc a link in POD and updated License

=item - 1.2.45UC8fo  Sun May 30 12:08:41:50 2004

* tidied POD and increased minor version number since CPAN can't read PT in VERSION

=item - 1.0.44E9ljP  Wed Apr 14 09:47:45:25 2004

* added test for divide-by-zero error in choo()

* added summ()

=item - 1.0.446EIbS  Tue Apr  6 14:18:37:28 2004

* snuck in fact() and choo()

=item - 1.0.42REDir  Fri Feb 27 14:13:44:53 2004

* changed test.pl to hopefully pass MSWin32-x86-multi-thread

=item - 1.0.428LV46  Sun Feb  8 21:31:04:06 2004

* broke apart CHANGES to descend chronologically

* made dec() auto uppercase param since dec(a) was returning 36 instead of 10

=item - 1.0.41M4GMP  Thu Jan 22 04:16:22:25 2004

* put cnv in bin/ as EXE_FILES

=item - 1.0.418BEPc  Thu Jan  8 11:14:25:38 2004

* testing new e auto-generate MANIFEST(.SKIP)?

=item - 1.0.3CNH37s  Tue Dec 23 17:03:07:54 2003

* updated POD

=item - 1.0.3CG3dIx  Tue Dec 16 03:39:18:59 2003

* normalized base spelling

=item - 1.0.3CD1Vdd  Sat Dec 13 01:31:39:39 2003

* added ABSTRACT section to WriteMakeFile()

* changed synopsis example

* updated all POD indenting

=item - 1.0.3CCA5Mi  Fri Dec 12 10:05:22:44 2003

* removed indenting from POD NAME field

=item - 1.0.3CB7M43  Thu Dec 11 07:22:04:03 2003

* updated package to coincide with Time::Fields release

=item - 1.0.39B36Lv  Thu Sep 11 03:06:21:57 2003

* synchronized POD with README documentation using new e utility

* templatized package compilation

* fixed boundary bugs

=item - 1.0.37SLNGN  Mon Jul 28 21:23:16:23 2003

* first version (and my first Perl module... yay!) put on CPAN

=item - 1.0.37JKj3w  Sat Jul 19 20:45:03:58 2003

* reworked interface from shell utility to package

=item - 1.0.3159mLT  Sun Jan  5 09:48:21:29 2003

* original version

=back

=head1 TODO

=over 2

=item - better error checking

=item - handle fractions and exponents?

=back

=head1 INSTALL

Please run:

  `perl -MCPAN -e "install Math::BaseCnv"`

or uncompress the package and run:

  `perl Makefile.PL;       make;       make test;       make install`
    or if you don't have  `make` but Module::Build is installed, try:
  `perl    Build.PL; perl Build; perl Build test; perl Build install`

=head1 FILES

Math::BaseCnv requires:

L<Math::BigInt>          to allow Big summ(), fact(), and choo() results

L<Memoize>               to cache     summ(), fact(), and choo() results

L<Carp>                  to allow errors to croak() from calling sub

=head1 LICENSE

Most source code should be Free! Code I have lawful authority over is and shall be!
Copyright: (c) 2003-2016, Pip Stuart.
Copyleft :  This software is licensed under the GNU General Public License
  (version 3 or later). Please consult L<HTTP://GNU.Org/licenses/gpl-3.0.txt>
  for important information about your freedom. This is Free Software: you
  are free to change and redistribute it. There is NO WARRANTY, to the
  extent permitted by law. See L<HTTP://FSF.Org> for further information.

=head1 AUTHOR

Pip Stuart <Pip@CPAN.Org>

=cut