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Base62x.pm
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Base62x.pm
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#!/usr/bin/perl -w
=pod
* -Base62x in -Perl
* Wadelau@{ufqi,gmail,hotmail}.com
* Refers to
* http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6020065
* -GitHub-Wadelau , base62x.c
* https://github.com/wadelau/Base62x
* https://ufqi.com/dev/base62x/?_via=-naturedns
* since Tue Aug 9 21:18:14 CST 2016
* bugfix, 13:39 13 September 2016
* bugfix, Thu Sep 29 04:06:26 UTC 2016
* imprvs on numeric conversion, Fri Oct 7 03:42:59 UTC 2016
* bugifx by _decodeByLength, 20:40 28 November 2016
* Base62x in Perl, init, Thu Aug 30 20:49:27 CST 2018
* Base62x in Perl, refine, Tue Sep 4 19:56:01 CST 2018
* imprvs with decode, refer to Base62x in Python, Sat Mar 9 13:48:05 GMT 2019
=cut
#package MIME::Base62x;
package Base62x;
use strict;
use warnings;
use vars qw(@ISA @EXPORT $VERSION);
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(base62x_encode base62x_decode);
my $VERSION = '1.0';
my $UTF8 = 'UTF-8';
my $LOGTAG = 'Base62x';
use constant {
XTAG => 'x',
ENCD => '-enc',
DECD => '-dec',
DEBG => '-v',
CVTN => '-n',
};
my ($i, $isdebug, $codetype) = (0, 0, 0);
my ($bpos, $xpos, $ascmax, $max_safe_base, $base59) = (60, 64, 127, 36, 59);
# 0-60 chars; b62x[64] = 'x'
my @b62x = ('0','1','2','3','4','5','6','7','8','9',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N',
'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b',
'c','d','e','f','g','h','i','j','k','l','m','n','o','p',
'q','r','s','t','u','v','w','y','z','1','2','3','x');
my @asclist = ('4','5','6','7','8','9', '0',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N',
'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b',
'c','d','e','f','g','h','i','j','k','l','m','n','o','p',
'q','r','s','t','u','v','w','y','z'); # 58
my (%rb62x, @ascidx, %ascrlist) = ((), (), ());
# @override new
sub new {
my $class = $_[0]; # shift;
my $self = {};
my $args = $_[1]; # pop @_;
bless $self, $class;
my @args = ();
if(defined($args)){
@args = @{$args};
}
my $argc = scalar @args;
$self->_fillRb62x();
return $self;
}
#
# OOP style
# encode, ibase=2,8,10,16,32...
sub encode($ $) {
my $self = $_[0]; # shift
my $output = '';
my $input = $_[1];
my $ibase = 0;
my $argc = scalar @_;
if($argc > 2){
$ibase = $_[2];
}
#print $LOGTAG.":encode: argc:[$argc] input1:[$input] 2:[$ibase] input-len:".length($input)."\n";
if($input eq ''){ return $output; }
$codetype = 0;
my $rb62xSize = keys %rb62x;
if($rb62xSize < 1){ $self->_fillRb62x(); }
my $isNum = 0;
my $xtag = XTAG;
if($ibase > 0){ $isNum = 1; }
if($isNum == 1){
# number
$output = 0;
my $num_input = $self->_xx2dec($input, $ibase, \%rb62x);
$output = $self->_dec2xx($num_input, $xpos, \@b62x);
}
else{
# string
$input = Encode::encode($UTF8, $input);
my @inputArr = split(//, $input); my $inputlen = scalar @inputArr;
#print "aft pack:input:[$input] length:".$inputlen."\n";
my $asctype = $self->_setAscii($codetype, \@inputArr);
my @op = ();
$i = 0 ; my $m = 0;
if($asctype == 1){
# ascii string
my $ixtag = ord($xtag);
do{
$inputArr[$i] = ord($inputArr[$i]);
if($ascidx[$inputArr[$i]] ne "-1"){ # has set
$op[$m] = $xtag;
$op[++$m] = $ascidx[$inputArr[$i]];
}
elsif($inputArr[$i] == $ixtag){
$op[$m] = $xtag;
$op[++$m] = $xtag;
}
else{
$op[$m] = chr($inputArr[$i]);
}
$m++;
}
while(++$i < $inputlen);
$op[$m] = $xtag; # asctype=1 has a tag 'x' appended
}
else{
# non-ascii, string
my ($c0, $c1, $c2, $c3, $remaini) = (0, 0, 0, 0, 0);
do{
$remaini = $inputlen - $i;
$inputArr[$i] = ord($inputArr[$i]);
#print "".($i).": byte:[".$inputArr[$i]."] char:[".chr($inputArr[$i])."]\n";
if($remaini > 2){
$inputArr[$i+1] = ord($inputArr[$i+1]);
$inputArr[$i+2] = ord($inputArr[$i+2]);
$c0 = $inputArr[$i] >> 2;
$c1 = ((($inputArr[$i] << 6) & 0xff) >> 2) | ($inputArr[$i+1] >> 4);
$c2 = ((($inputArr[$i+1] << 4) & 0xff) >> 2) | ($inputArr[$i+2] >> 6);
$c3 = (($inputArr[$i+2] << 2) & 0xff) >> 2;
if($c0 > $bpos){ $op[$m] = $xtag; $op[++$m] = $b62x[$c0]; }
else{ $op[$m] = $b62x[$c0]; }
if($c1 > $bpos){ $op[++$m] = $xtag; $op[++$m] = $b62x[$c1]; }
else{ $op[++$m] = $b62x[$c1]; }
if($c2 > $bpos){ $op[++$m] = $xtag; $op[++$m] = $b62x[$c2]; }
else{ $op[++$m] = $b62x[$c2]; }
if($c3 > $bpos){ $op[++$m] = $xtag; $op[++$m] = $b62x[$c3]; }
else{ $op[++$m] = $b62x[$c3]; }
$i += 2;
}
elsif($remaini == 2){
$inputArr[$i+1] = ord($inputArr[$i+1]);
$c0 = $inputArr[$i] >> 2;
$c1 = ((($inputArr[$i] << 6) & 0xff) >> 2) | ($inputArr[$i+1] >> 4);
$c2 = (($inputArr[$i+1] << 4) & 0xff) >> 4;
if($c0 > $bpos){ $op[$m] = $xtag; $op[++$m] = $b62x[$c0]; }
else{ $op[$m] = $b62x[$c0]; }
if($c1 > $bpos){ $op[++$m] = $xtag; $op[++$m] = $b62x[$c1]; }
else{ $op[++$m] = $b62x[$c1]; }
if($c2 > $bpos){ $op[++$m] = $xtag; $op[++$m] = $b62x[$c2]; }
else{ $op[++$m] = $b62x[$c2]; }
$i += 1;
}
elsif($remaini == 1){
$c0 = $inputArr[$i] >> 2;
$c1 = (($inputArr[$i] << 6) & 0xff) >> 6;
if($c0 > $bpos){ $op[$m] = $xtag; $op[++$m] = $b62x[$c0]; }
else{ $op[$m] = $b62x[$c0]; }
if($c1 > $bpos){ $op[++$m] = $xtag; $op[++$m] = $b62x[$c1]; }
else{ $op[++$m] = $b62x[$c1]; }
}
$m++;
}
while(++$i < $inputlen);
}
$output = join('', @op);
}
return $output;
}
#
# decode, obase=2,8,10,16,32...
sub decode($ $){
my $self = $_[0]; # shift
my $output = '';
my $input = $_[1];
my $ibase = 0;
my $argc = scalar @_;
if($argc > 2){
$ibase = $_[2];
}
if($input eq ''){ return $output; }
$codetype = 1;
my $xtag = XTAG;
my $rb62xSize = keys %rb62x;
if($rb62xSize < 1){ $self-> _fillRb62x(); }
my $isNum = 0;
if($ibase > 0){ $isNum = 1; }
if($isNum == 1){
# number
$output = 0;
my $num_input = $self->_xx2dec($input, $xpos, \%rb62x);
$output = $self->_dec2xx($num_input, $ibase, \@b62x);
}
else{
# string
my @inputArr = split(//, $input); my $inputlen = scalar @inputArr;
#print "aft pack:input:[$input] length:".$inputlen." codetype:[$codetype]\n";
my $asctype = $self->_setAscii($codetype, \@inputArr);
my @op = ();
$i = 0 ; my $m = 0;
if($asctype == 1){
# ascii
$inputlen--; # omit last 'x'
do{
if($inputArr[$i] eq $xtag){
if($inputArr[$i+1] eq $xtag){
$op[$m] = $xtag;
$i++;
}
else{
$op[$m] = chr($ascrlist{$inputArr[++$i]});
}
}
else{
$op[$m] = $inputArr[$i];
}
$m++;
}
while(++$i < $inputlen);
}
else{
# non-ascii
my (@tmpArr, @arr, $arr) = ((), (), undef); my $remaini = 0;
my @bint = (0, 1, 2, 3); my $j = 0;
do{
@tmpArr = (undef, undef, undef, undef);
$remaini = $inputlen - $i;
#print "".($i).": byte:[".$inputArr[$i]."] char:[".ord($inputArr[$i])."]\n";
if($remaini > 1){
$j = 0;
do{
if($inputArr[$i] eq $xtag){
$i++;
$tmpArr[$j] = $bpos + $bint[$inputArr[$i]];
}
else{
$tmpArr[$j] = $rb62x{$inputArr[$i]};
}
$i++; $j++;
}
while($j < 4 && $i < $inputlen);
$arr = $self->_decodeByLength(\@tmpArr, \@op, $m);
@arr = @{$arr}; @op = @{$arr[0]}; $m = $arr[1];
# m is deprecated.
}
elsif($remaini == 1){
print($LOGTAG.": found illegal base62x input:[".$inputArr[$i]."]. 1608091042.");
$i++;
next;
}
$m++;
}
while($i < $inputlen);
}
$output = join('', @op);
}
$output = Encode::decode($UTF8, $output);
return $output;
}
#
# functional style, static
sub base62x_encode {
#my $self = $_[0];
my $self = Base62x->new();
my $rtn = '';
my $input = $_[0];
my $ibase = 0;
my $argc = scalar @_;
if($argc > 1){
$ibase = $_[1];
}
$rtn = $self->encode($input, $ibase);
return $rtn;
}
#
sub base62x_decode {
my $self = Base62x->new();
my $rtn = '';
my $input = $_[0];
my $obase = 0;
my $argc = scalar @_;
if($argc > 1){
$obase = $_[1];
}
$rtn = $self->decode($input, $obase);
return $rtn;
}
#
sub _fillRb62x(){
my $self = $_[0];
for($i=0; $i<=$xpos; $i++){
if($i > $bpos && $i < $xpos){
# omit x1, x2, x3
}
else{
$rb62x{$b62x[$i]} = $i;
}
}
return 0;
}
#
# inner methods
#
sub _setAscii($ $){
my $self = $_[0];
my $asctype = 0;
my $codetype = $_[1];
my @inputArr = @{$_[2]};
my $inputlen = scalar @inputArr;
if($codetype == 0 && ord($inputArr[0]) <= $ascmax){
$asctype = 1; my $tmpi = 0;
for($i=1; $i<$inputlen; $i++){
$tmpi = ord($inputArr[$i]);
if($tmpi > $ascmax
|| ($tmpi > 16 && $tmpi < 21) # DC1-4
|| ($tmpi > 27 && $tmpi < 32)){ # FC, GS, RS, US
$asctype = 0;
last;
}
}
}
elsif($codetype == 1 && $inputArr[$inputlen - 1] eq XTAG){
$asctype = 1;
}
if($asctype == 1){
my $idxlen = scalar @ascidx;
if($idxlen < 1){
$self->_fillAscRlist();
}
}
return $asctype;
}
#
sub _fillAscRlist(){
my $self = $_[0];
for($i=0; $i<$ascmax; $i++){ $ascidx[$i] = -1; }
my $idxi = 0;
my @bgnArr = (0, 21, 32, 58, 91, 123);
my @endArr = (17, 28, 48, 65, 97, $ascmax+1);
my $arrSize = scalar @bgnArr;
for(my $ai=0; $ai<$arrSize; $ai++){
my $bgn = $bgnArr[$ai];
my $end = $endArr[$ai];
for($i=$bgn; $i<$end; $i++){
$ascidx[$i] = $asclist[$idxi];
$ascrlist{$asclist[$idxi]} = $i;
$idxi++;
}
}
return 0;
}
#
sub _decodeByLength($ $ $){
my $self = $_[0];
my @rtnArr = ();
my @tmpArr = @{$_[1]};
my @op = @{$_[2]};
my $m = $_[3];
my ($c0, $c1, $c2) = (0, 0, 0);
if(defined($tmpArr[3])){
$c0 = $tmpArr[0] << 2 | $tmpArr[1] >> 4;
$c1 = (($tmpArr[1] << 4) & 0xf0) | ($tmpArr[2] >> 2);
$c2 = (($tmpArr[2] << 6) & 0xff) | $tmpArr[3];
$op[$m] = chr($c0);
$op[++$m] = chr($c1);
$op[++$m] = chr($c2);
}
elsif(defined($tmpArr[2])){
$c0 = $tmpArr[0] << 2 | $tmpArr[1] >> 4;
$c1 = (($tmpArr[1] << 4) & 0xf0) | $tmpArr[2];
$op[$m] = chr($c0);
$op[++$m] = chr($c1);
}
elsif(defined($tmpArr[1])){
$c0 = $tmpArr[0] << 2 | $tmpArr[1];
$op[$m] = chr($c0);
}
else{
$c0 = $tmpArr[0];
$op[$m] = chr($c0);
}
$rtnArr[0] = \@op;
$rtnArr[1] = $m;
return \@rtnArr;
}
#
# xx2dec, ibase=2, 3, 4, 5...62
sub _xx2dec($ $ $){
my $self = $_[0];
my $rtn = 0;
my $inum = $_[1];
my $ibase = $_[2];
my %ridx = %{$_[3]};
my $xtag = XTAG;
if($ibase <= $max_safe_base){
$rtn = $self->_baseFrom($inum, $ibase);
}
else{
if($ibase > $base59 && $ibase < $xpos){
my %ridx_in = ();
for my $ri (keys %ridx){
$ridx_in{$ri} = $ridx{$ri};
}
$ridx_in{'x'} = 59; $ridx_in{'y'} = 60; $ridx_in{'z'} = 61;
%ridx = %ridx_in;
}
my @inArr = split(//, $inum);
@inArr = reverse(@inArr);
my $arrSize = scalar @inArr;
my $xnum = 0; my $tmpi = 0; my $isBase62x = ($ibase==$xpos);
for($i=0; $i<$arrSize; $i++){
if($isBase62x && defined($inArr[$i+1]) && $inArr[$i+1] eq $xtag){
$tmpi = $bpos + $ridx{$inArr[$i]};
$xnum++;
$i++;
}
else{
$tmpi = $ridx{$inArr[$i]};
}
if($tmpi >= $ibase){
print "".$LOGTAG.": _xx2dec found out of radix:$tmpi for base:$ibase.\n";
$tmpi = $ibase - 1;
}
$rtn = $rtn + $tmpi * ($ibase ** ($i - $xnum));
}
}
#print "".$LOGTAG.": _xx2dec: innum:$inum ibase:$ibase rtn:$rtn\n";
return $rtn;
}
#
# dec2xx, obase=2, 3, 4, 5...62
sub _dec2xx($ $ $){
my $self = $_[0];
my $rtn = 0;
my $inum = $_[1];
my $obase = $_[2];
my @ridx = @{$_[3]};
my $xtag = XTAG;
if($obase <= $max_safe_base){
$rtn = $self->_baseTo($inum, $obase);
}
else{
my $isBase62x = 0;
if($obase > $base59 && $obase < $xpos){
my @idx_in = (); my $ri = 0;
foreach my $rv (@ridx){
$idx_in[$ri++] = $rv;
}
$idx_in[59] = 'x'; $idx_in[60] = 'y'; $idx_in[61] = 'z';
@ridx = @idx_in;
}
elsif($obase == $xpos){
$isBase62x = 1;
}
my $maxPos = $bpos;
if($isBase62x == 0){ $maxPos = $bpos + 1; } # cover all 0-61 chars
$i = 0;
my $b = 0; my @outArr = ();
do{
$b = $inum % $obase;
$inum = int($inum / $obase);
if($b <= $maxPos){
$outArr[$i++] = $ridx[$b];
}
else{
$outArr[$i++] = $ridx[$b - $bpos];
$outArr[$i++] = $xtag;
}
}
while($inum >= $obase);
$b = $inum;
if($b > 0){
if($b <= $maxPos){
$outArr[$i++] = $ridx[$b];
}
else{
$outArr[$i++] = $ridx[$b - $bpos];
$outArr[$i++] = $xtag;
}
}
@outArr = reverse(@outArr);
$rtn = join('', @outArr);
}
#print "".$LOGTAG.": _dec2xx: innum:".$_[1]." obase:$obase rtn:$rtn\n";
return $rtn;
}
#
sub _baseTo($ $){
my($n,$b) = ($_[1], $_[2]);
my $s = "";
while ($n) {
$s .= ('0'..'9','A'..'Z')[$n % $b];
$n = int($n/$b);
}
return scalar(reverse($s));
}
#
sub _baseFrom($ $){
my($n,$b) = ($_[1], $_[2]);
my $t = 0;
for my $c (split(//, uc($n))) {
$t = $b * $t + index("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ", $c);
}
return $t;
}
1;