1BaseCnv(3) User Contributed Perl Documentation BaseCnv(3)
2
6 Math::BaseCnv - basic functions to CoNVert between number Bases
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9 This documentation refers to version 1.14 of Math::BaseCnv, which was
10 released on Sat Jul 30 06:44:28:46 -0500 2016.
11
13 #!/usr/bin/perl
14 use strict;use warnings;use utf8;use v5.10;use Math::BaseCnv;
15 # CoNVert 63 from base-10 (decimal) to base- 2 (binary )
17 my $binary__63 = cnv( 63 , 10, 2 );
18 # CoNVert 111111 from base- 2 (binary ) to base-16 (HEX )
19 my $HEX_____63 = cnv( 111111 , 2, 16 );
20 # CoNVert 3F from base-16 (HEX ) to base-10 (decimal)
21 my $decimal_63 = cnv( '3F', 16, 10 );
22 say "63 dec->bin $binary__63 bin->HEX $HEX_____63 HEX->dec $decimal_63";
23
25 BaseCnv provides a few simple functions for converting between
26 arbitrary number bases. You're probably better off using Michael
27 Robinton's Math::Base::Convert benchmarked high-performance Perl
28 modules. Another object syntax for number-base conversion is Ken
29 Williams' fine Math::BaseCalc module.
30
32 The reason I created BaseCnv was that I needed a simple way to convert
33 quickly between the 3 number bases I use most (10, 16, and 64). It
34 turned out that it was trivial to handle any arbitrary number base that
35 is represented as characters. High-bit ASCII has proven somewhat
36 problemmatic but at least BaseCnv can simply and reliably convert
37 between any possible base between 2 and 64 (or 96). I'm happy with it
38 and employ b64() in places I probably shouldn't now.
39
41 cnv($numb[,$from[,$tobs]])
42 CoNVert the number contained in $numb from its current number base
43 ($from) into the result number base ($tobs).
44 When only $numb is provided as a parameter:
46 If $numb only contains valid decimal (base 10) digits, it will be
48 converted to HEXADECIMAL (base 16).
49 If $numb only contains valid hexadecimal (base 16) digits or begins
51 with '0x', it will be it will be converted to decimal (base 10).
52 When only $numb and $from are provided as parameters:
54 cnv() assumes that $numb is already in decimal format and uses $from as
56 the $tobs.
57 When all three parameters are provided:
59 The normal (and most clear) usage of cnv() is to provide all three
61 parameters where $numb is converted from $from base to $tobs.
62 cnv() is the only function that is exported from a normal 'use
64 Math::BaseCnv;' command. The other functions below can be imported to
65 local namespaces explicitly or with the following tags:
66 :all - every function described here
68 :heX - only cnv(), dec(), heX(), and HEX()
69 :b64 - only cnv(), b10(), b64(), and b64sort()
70 :dig - only dig() and diginit()
71 :sfc - only summ(), fact(), and choo()
72 b10($b64n)
74 A shortcut to convert the number given as a parameter ($b64n) from base
75 64 to decimal (base 10).
76 b64($b10n)
78 A shortcut to convert the number given as a parameter ($b10n) from
79 decimal (base 10) to base 64.
80 b64sort(@b64s)
82 A way to sort b64 strings as though they were decimal numbers.
83 dec($b16n)
85 A shortcut to convert the number given as a parameter ($b16n) from
86 hexadecimal (base 16) to decimal (base 10).
87 HEX($b10n)
89 A shortcut to convert the number given as a parameter ($b10n) from
90 decimal (base 10) to HEXADECIMAL (base 16) uppercase.
91 heX($b10n)
93 A shortcut to convert the number given as a parameter ($b10n) from
94 decimal (base 10) to hexadecimal (base 16) lowercase.
95 Please read the "NOTES" regarding heX().
97 dig(\@newd)
99 Assign the new digit character list to be used in place of the default
100 one. dig() can also alternately accept a string name matching one of
101 the following predefined digit sets:
102 'bin' => ['0', '1'],
104 'dna' => ['a', 'c', 'g', 't'],
105 'DNA' => ['A', 'C', 'G', 'T'],
106 'oct' => ['0'..'7'],
107 'dec' => ['0'..'9'],
108 'heX' => ['0'..'9', 'a'..'f'],
109 'HEX' => ['0'..'9', 'A'..'F'],
110 'b36' => ['0'..'9', 'a'..'z'],
111 'B36' => ['0'..'9', 'A'..'Z'],
112 'b62' => ['0'..'9', 'a'..'z', 'A'..'Z'],
113 'b64' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_'], # month:C:12 day:V:31
114 'm64' => ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'], # 0-63 from MIME::Base64
115 'iru' => ['A'..'Z', 'a'..'z', '0'..'9', '[', ']'], # P10 server-server protocol used by IRCu daemon
116 'url' => ['A'..'Z', 'a'..'z', '0'..'9', '-', '_'], # MIME::Base64::URLSafe (avoid %2B %2F expansions)
117 'rgx' => ['A'..'Z', 'a'..'z', '0'..'9', '!', '-'], # ReGular eXpression variant
118 'id0' => ['A'..'Z', 'a'..'z', '0'..'9', '_', '-'], # IDentifier style 0
119 'id1' => ['A'..'Z', 'a'..'z', '0'..'9', '.', '_'], # IDentifier style 1
120 'xnt' => ['A'..'Z', 'a'..'z', '0'..'9', '.', '-'], # XML Name Tokens (Nmtoken)
121 'xid' => ['A'..'Z', 'a'..'z', '0'..'9', '_', ':'], # XML identifiers (Name )
122 'sxl' => ['?', '@', 'A'..'Z', '[','\\', ']', '^', # Sixel Base64 from VT100.Net
123 '_', '`', 'a'..'z', '{', '|', '}', '~'],
124 'b85' => ['0'..'9', 'A'..'Z', 'a'..'z', '!', '#', # RFC 1924 for IPv6 addresses like in Math::Base85
125 '$', '%', '&', '(', ')', '*', '+', '-',
126 ';', '<', '=', '>', '?', '@', '^', '_',
127 '`', '{', '|', '}', '~' ],
128 'asc' => [' ', '!', '"', '#', '$', '%', '&', "'", # Base96 7-bit printable 0x20 (space) - 0x7F
129 '(', ')', '*', '+', ',', '-', '.', '/', # (tilde ~) 'ascii' from Math::Base::Convert
130 '0'..'9', ':', ';', '<', '=', '>', '?',
131 '@', 'A'..'Z', '[','\\', ']', '^', '_',
132 '`', 'a'..'z', '{', '|', '}', '~' ],
133 'b96' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_', # Base96 but starting with b64 characters
134 ' ', '!', '"', '#', '$', '%', '&', "'",
135 '(', ')', '*', '+', ',', '-', '/', ':',
136 ';', '<', '=', '>', '?', '@', '[','\\',
137 ']', '^', '`', '{', '|', '}', '~' ],
138 If no \@newd list or digit set name is provided as a parameter, dig()
140 returns the current character list. It's fine to have many more
141 characters in your current digit set than will be used with your
142 conversions (e.g., using dig('b64') works fine for any cnv() call with
143 $from and $tobs params less than or equal to 64).
144 An example of a \@newd parameter for a specified alternate digit set
146 for base 9 conversions is:
147 dig( [ qw( n a c h o z y u m ) ] );
149 diginit()
151 Resets the used digit list to the initial default order of the
152 predefined digit set: 'b64'. This is simply a shortcut for calling
153 dig('b64') for reinitialization purposes.
154 summ($numb)
156 A simple function to calculate a memoized BigInt summation of $numb
157 down to 1.
158 fact($numb)
160 A simple function to calculate a memoized BigInt factorial of $numb.
161 choo($ennn, $emmm)
163 A simple function to calculate a memoized BigInt function of $ennn
164 choose $emmm.
165
167 The Perl built-in hex() function takes a hex string as a parameter and
168 returns the decimal value (FromBase = 16, ToBase = 10). This notation
169 seems counter-intuitive to me since I prefer to read the code as though
170 a hex() function will turn your parameter into hexadecimal (i.e., I
171 think hex() should hexify your parameter but Perl's built-in does
172 not.). I initially decided to invert the notation for my similar
173 functions, but reconsidered the potential harm possible by introducing
174 exported conflicting opposite behavior into other people's maybe
175 crucial code, so I am falling back on unique casing with heX().
176 My b64() function takes a decimal number as a parameter and returns the
178 base64 equivalent (FromBase = 10, ToBase = 64) and my b10() function
179 takes a base64 number (string) and returns the decimal value (FromBase
180 = 64, ToBase = 10). My heX() function opposes Perl's built-in hex()
181 (which is similar to my dec()).
182 Please think of my dec() and heX() functions as meaning decify and
184 heXify. Also the pronunciation of dec() is 'dess' (not 'deck').
185 Error checking is minimal.
187 This module does not handle fractional number inputs because I like
189 using the dot (.) character as a standard base64 digit since it makes
190 for clean filenames.
191 summ(), fact(), and choo() are general Math function utilities which
193 are unrelated to number-base conversion but I didn't feel like making
194 another separate module just for them so they snuck in here.
195 I hope you find Math::BaseCnv useful. TTFN.
197
199 Revision history for Perl extension Math::BaseCnv:
200 - 1.14 G7UM6iSk Sat Jul 30 06:44:28:46 -0500 2016
202 * synchronized README and Changes to updated POD
203 - 1.12 G7OMKBCn Sun Jul 24 20:11:12:49 -0500 2016
205 * added digit set 'b96' as a reordering of 'asc'
206 - 1.10 G7OMF3ZT Sun Jul 24 15:03:35:29 -0500 2016
208 * added new digit sets from Math::Base::Convert
209 * switched all old hex() to distinct new heX() and updated POD to
211 reflect
212 * fixed META license to match POD and resolve issue:
214 <HTTPS://RT.CPAN.Org/Public/Bug/Display.html?id=60122> (Thanks again
215 xenoterracide.)
216 * removed PT from VERSION to resolve issue:
218 <HTTPS://RT.CPAN.Org/Public/Bug/Display.html?id=60275> (Thanks
219 Alexandr.)
220 - 1.8.B59BrZX Mon May 9 11:53:35:33 2011
222 * updated 'url' digit set to URLSafe to resolve
223 <HTTPS://RT.CPAN.Org/Ticket/Display.html?id=60125> (Thanks
224 xenoterracide.)
225 * updated license copyright years (already had GPLv3)
227 - 1.6.A6FGHKE Tue Jun 15 16:17:20:14 2010
229 * bumped minor version number so they'll keep ascending (without PT
230 comprehension)
231 - 1.4.A6FAbEb Tue Jun 15 10:37:14:37 2010
233 * added Math::BigInt code for >64-bit number-base conversions
234 * added a bunch more DigitSets: IRCu, URL, RegEx, identifier
236 variants, XML Nmtoken, and XML ID Name
237 - 1.4.75O6Pbr Thu May 24 06:25:37:53 2007
239 * added Test::Pod(::Coverage)? tests and PREREQ entries
240 * added b85 for IPv6, generated META.yml (with needed newline before
242 EOF) and updated minor version number
243 - 1.2.68J9uJQ Sat Aug 19 09:56:19:26 2006
245 * added b64sort() and put POD at bottom
246 - 1.2.59M7mRX Thu Sep 22 07:48:27:33 2005
248 * testing Make as primary and BuildPL backup (needing rename for dot)
249 - 1.2.59IBlgw Sun Sep 18 11:47:42:58 2005
251 * testing just using Module::Build instead of MakeMaker
252 * fixed test 12 which was failing on AMD64
254 * added Build.PL to package
256 - 1.2.54HK3pB Sun Apr 17 20:03:51:11 2005
258 * removed 128 digit-set since some high-bit characters cause problems
259 on Win32
260 * made bin/cnv only executable to go in EXE_FILES
262 * made Math::BaseCalc a link in POD and updated License
264 - 1.2.45UC8fo Sun May 30 12:08:41:50 2004
266 * tidied POD and increased minor version number since CPAN can't read
267 PT in VERSION
268 - 1.0.44E9ljP Wed Apr 14 09:47:45:25 2004
270 * added test for divide-by-zero error in choo()
271 * added summ()
273 - 1.0.446EIbS Tue Apr 6 14:18:37:28 2004
275 * snuck in fact() and choo()
276 - 1.0.42REDir Fri Feb 27 14:13:44:53 2004
278 * changed test.pl to hopefully pass MSWin32-x86-multi-thread
279 - 1.0.428LV46 Sun Feb 8 21:31:04:06 2004
281 * broke apart CHANGES to descend chronologically
282 * made dec() auto uppercase param since dec(a) was returning 36
284 instead of 10
285 - 1.0.41M4GMP Thu Jan 22 04:16:22:25 2004
287 * put cnv in bin/ as EXE_FILES
288 - 1.0.418BEPc Thu Jan 8 11:14:25:38 2004
290 * testing new e auto-generate MANIFEST(.SKIP)?
291 - 1.0.3CNH37s Tue Dec 23 17:03:07:54 2003
293 * updated POD
294 - 1.0.3CG3dIx Tue Dec 16 03:39:18:59 2003
296 * normalized base spelling
297 - 1.0.3CD1Vdd Sat Dec 13 01:31:39:39 2003
299 * added ABSTRACT section to WriteMakeFile()
300 * changed synopsis example
302 * updated all POD indenting
304 - 1.0.3CCA5Mi Fri Dec 12 10:05:22:44 2003
306 * removed indenting from POD NAME field
307 - 1.0.3CB7M43 Thu Dec 11 07:22:04:03 2003
309 * updated package to coincide with Time::Fields release
310 - 1.0.39B36Lv Thu Sep 11 03:06:21:57 2003
312 * synchronized POD with README documentation using new e utility
313 * templatized package compilation
315 * fixed boundary bugs
317 - 1.0.37SLNGN Mon Jul 28 21:23:16:23 2003
319 * first version (and my first Perl module... yay!) put on CPAN
320 - 1.0.37JKj3w Sat Jul 19 20:45:03:58 2003
322 * reworked interface from shell utility to package
323 - 1.0.3159mLT Sun Jan 5 09:48:21:29 2003
325 * original version
326
328 - better error checking
329 - handle fractions and exponents?
330
332 Please run:
333 `perl -MCPAN -e "install Math::BaseCnv"`
335 or uncompress the package and run:
337 `perl Makefile.PL; make; make test; make install`
339 or if you don't have `make` but Module::Build is installed, try:
340 `perl Build.PL; perl Build; perl Build test; perl Build install`
341
343 Math::BaseCnv requires:
344 Math::BigInt to allow Big summ(), fact(), and choo() results
346 Memoize to cache summ(), fact(), and choo() results
348 Carp to allow errors to croak() from calling sub
350
352 Most source code should be Free! Code I have lawful authority over is
353 and shall be! Copyright: (c) 2003-2016, Pip Stuart. Copyleft : This
354 software is licensed under the GNU General Public License
355 (version 3 or later). Please consult
356 <HTTP://GNU.Org/licenses/gpl-3.0.txt>
357 for important information about your freedom. This is Free Software:
358 you
359 are free to change and redistribute it. There is NO WARRANTY, to the
360 extent permitted by law. See <HTTP://FSF.Org> for further
361 information.
362
364 Pip Stuart <Pip@CPAN.Org>
365perl v5.30.1 2020-01-30 BaseCnv(3)