3159mLT - Math::BaseCnv.pm created by Pip@CPAN.org to convert between arbitrary number bases... I'm totally addicted to bass =). NAME BaseCnv - A small perl module which exports functions to quickly convert between any number bases SYNOPSIS use Math::BaseCnv; @numb = ( 0, 2, 7, 42, 55, 57, 99, 127 ); @cycl = ( 10, 2, 64, 7, 10 ); print("Format: FromBass -> ToBass = ConvertedNumber\n"); foreach $n (@numb) { printf("%-3d:", $n); for($i = 1; $i < @cycl; $i++) { $n = cnv($n, $cycl[$i - 1], $cycl[$i]); printf("%3d->%-3d=%-7s", $cycl[$i - 1], $cycl[$i], $n); } print("\n"); } -- execution output: Format: FromBass -> ToBass = ConvertedNumber 0 : 10->2 =0 2->64 =0 64->7 =0 7->10 =0 2 : 10->2 =10 2->64 =2 64->7 =2 7->10 =2 7 : 10->2 =111 2->64 =7 64->7 =10 7->10 =7 42 : 10->2 =101010 2->64 =g 64->7 =60 7->10 =42 55 : 10->2 =110111 2->64 =t 64->7 =106 7->10 =55 57 : 10->2 =111001 2->64 =v 64->7 =111 7->10 =57 99 : 10->2 =1100011 2->64 =1Z 64->7 =201 7->10 =99 127: 10->2 =1111111 2->64 =1_ 64->7 =241 7->10 =127 DESCRIPTION BaseCnv provides a few simple functions for converting between arbitrary number bases. It is as fast as I currently know how to make it (of course relying only on the lovely perl). If you would rather utilize an object syntax for number-bass conversion, please see Ken Williams' fine Math::BaseCalc module. 2DO better error checking handle fractional parts? umm but I like using '.' as a b64 char =( What else does BaseCnv need? WHY? The reason I created BaseCnv was that I needed a simple way to convert quickly between the 3 number bases I use most (10, 16, && 64). It turned out that it was trivial to handle any number bass that could be represented as characters. High-bit ASCII proved somewhat problemmatic but at least BaseCnv can convert between any possible bass between 2 && 128 which is more than I originally needed. I'm quite happy with it =). FUNCTIONS cnv($numb[,$from[,$tobs]]) - Convert the number contained in $numb from its current number bass ($from) into the result number bass ($tobs). If only $numb is provided, it will be converted to hexadecimal (bass 16) if it only contains valid decimal digits or it will be converted to decimal (bass 10) if it contains hexadecimal digits or begins with '0x'. If only $numb && $from are provided as parameters, cnv assumes that $numb is already in decimal format && uses $from as the $tobs. The normal (&& most clear) usage is to provide all 3 parameters. b10($b64n) - A shortcut to convert the number given as a parameter ($b64n) from bass 64 to decimal (bass 10). b64($b10n) - A shortcut to convert the number given as a parameter ($b10n) from decimal (bass 10) to bass 64. dec($b16n) - A shortcut to convert the number given as a parameter ($b16n) from hexadecimal (bass 16) to decimal (bass 10). hex($b10n) - A shortcut to convert the number given as a parameter ($b10n) from decimal (bass 10) to hexadecimal (bass 16). hex() exports optionally. dig(\@newd) - Assign the new digit character list to be used in place of the Dflt one. dig() can also alternately accept a string name matching one of the following predefined digit sets: 'bin' => ['0', '1'] 'oct' => ['0'..'7'] 'dec' => ['0'..'9'] 'hex' => ['0'..'9', 'a'..'f'] 'HEX' => ['0'..'9', 'A'..'F'] 'b62' => ['0'..'9', 'a'..'z', 'A'..'Z'] '64' => ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'] # MIME::Base64 'b64' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_'] '128' => ['0'..'9', 'A'..'Z', 'a'..'z', '.', '_'... hi-bit chars 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 (eg. using dig('128') works fine for any cnv() call with a $from or $tobs param less than or equal to 128). An example of a \@newd parameter for a specified alternate digit set for octal conversions is: dig( [ qw( n a c h o z y u m ) ] ); diginit() - Resets the used digit list to the initial Dflt order of the predefined digit set: '128'. NOTES The perl builtin hex() function takes a hex string as a parameter && returns the decimal value (FromBass = 16, ToBass = 10) but this notation seems counter-intuitive to me since the code implies that a hex() function will turn your parameter into hexadecimal (ie. It sounds like hex will hexify your parameter but it does not.) so I've decided (maybe foolishly) to invert the notation for my similar functions since it makes more sense to me this way && will be easier to remember (I've had to lookup hex() in the Camel book many times already which was part of the impetus for this module... as well as the gut reaction that sprintf() is not a proper natural inverse function for hex()). This means that my b64() function takes a decimal number as a parameter && returns the bass64 equivalent (FromBass = 10, ToBass = 64) && my b10() function takes a bass64 number (string) && returns the decimal value (FromBass = 64, ToBass = 10). My hex() function overloads perl's builtin version with this opposite behavior so my dec() function behaves like perl's normal hex() function. I know it's confusing && maybe bad form of me to do this but I like it so much better this way that I'd rather go against the grain. Please think of my dec() && hex() functions as meaning decify && hexify. I guess I should export my hex optionally... or not... alright, it's in the optional EXPORT_OK now since it's totally not okay to break other programs with opposite behavior but my hex is there if you want to import it && the same behavior is easy enough with just cnv() =). Error checking is minimal at best so don't assume perfection... yet =). Detectable errors return -1. This module does not handle fractional number inputs because I like using the dot (.) character as a standard bass64 digit since it makes for clean filenames. I hope you find BaseCnv useful. Please feel free to e-mail me any suggestions || coding tips || notes of appreciation ("app-ree-see-ay-shun"). Thank you. TTFN. INSTALL Please run: `perl -MCPAN -e "install Math::BaseCnv"` or uncompress the package && run the standard: `perl Makefile.PL; make; make test; make install` CHANGES Please see the 'Changes' file from the install package. LICENSE All source code should be free! Code I have authority over is && shall be! Copyright (c) 2003, Pip Stuart. Copyleft: I license this software under the GNU General Public License (version 2). Please consult the Free Software Foundation (fsf.org) for important information about your freedom. AUTHOR Pip Stuart