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#!/usr/bin/perl | ||
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# Author: Daniel "Trizen" Șuteu | ||
# Date: 09 November 2024 | ||
# https://github.com/trizen | ||
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# Compress/decompress files using SWAP transform + LZB + Burrows-Wheeler Transform (BWT) + Move-to-Front Transform + Run-length encoding + Huffman coding. | ||
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# Reference: | ||
# Data Compression (Summer 2023) - Lecture 13 - BZip2 | ||
# https://youtube.com/watch?v=cvoZbBZ3M2A | ||
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use 5.036; | ||
use Getopt::Std qw(getopts); | ||
use File::Basename qw(basename); | ||
use Compression::Util qw(:all); | ||
use POSIX qw(ceil); | ||
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use constant { | ||
PKGNAME => 'SBWT', | ||
VERSION => '0.01', | ||
FORMAT => 'sbwt', | ||
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CHUNK_SIZE => 1 << 17, | ||
}; | ||
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# Container signature | ||
use constant SIGNATURE => uc(FORMAT) . chr(1); | ||
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sub usage { | ||
my ($code) = @_; | ||
print <<"EOH"; | ||
usage: $0 [options] [input file] [output file] | ||
options: | ||
-e : extract | ||
-i <filename> : input filename | ||
-o <filename> : output filename | ||
-r : rewrite output | ||
-v : version number | ||
-h : this message | ||
examples: | ||
$0 document.txt | ||
$0 document.txt archive.${\FORMAT} | ||
$0 archive.${\FORMAT} document.txt | ||
$0 -e -i archive.${\FORMAT} -o document.txt | ||
EOH | ||
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exit($code // 0); | ||
} | ||
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sub version { | ||
printf("%s %s\n", PKGNAME, VERSION); | ||
exit; | ||
} | ||
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sub valid_archive { | ||
my ($fh) = @_; | ||
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if (read($fh, (my $sig), length(SIGNATURE), 0) == length(SIGNATURE)) { | ||
$sig eq SIGNATURE || return; | ||
} | ||
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return 1; | ||
} | ||
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sub main { | ||
my %opt; | ||
getopts('ei:o:vhr', \%opt); | ||
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$opt{h} && usage(0); | ||
$opt{v} && version(); | ||
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my ($input, $output) = @ARGV; | ||
$input //= $opt{i} // usage(2); | ||
$output //= $opt{o}; | ||
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my $ext = qr{\.${\FORMAT}\z}io; | ||
if ($opt{e} || $input =~ $ext) { | ||
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if (not defined $output) { | ||
($output = basename($input)) =~ s{$ext}{} | ||
|| die "$0: no output file specified!\n"; | ||
} | ||
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if (not $opt{r} and -e $output) { | ||
print "'$output' already exists! -- Replace? [y/N] "; | ||
<STDIN> =~ /^y/i || exit 17; | ||
} | ||
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decompress_file($input, $output) | ||
|| die "$0: error: decompression failed!\n"; | ||
} | ||
elsif ($input !~ $ext || (defined($output) && $output =~ $ext)) { | ||
$output //= basename($input) . '.' . FORMAT; | ||
compress_file($input, $output) | ||
|| die "$0: error: compression failed!\n"; | ||
} | ||
else { | ||
warn "$0: don't know what to do...\n"; | ||
usage(1); | ||
} | ||
} | ||
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sub swap_transform ($text, $extra = 1) { | ||
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my @bits; | ||
my @arr = unpack('C*', $text); | ||
my $k = 0; | ||
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foreach my $i (1 .. $#arr) { | ||
if ($arr[$i] < $arr[$i - 1 - $k]) { | ||
push @bits, 1; | ||
unshift @arr, splice(@arr, $i, 1); | ||
++$k if $extra; | ||
} | ||
else { | ||
push @bits, 0; | ||
} | ||
} | ||
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return (pack('C*', @arr), \@bits); | ||
} | ||
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sub reverse_swap_transform ($text, $bits) { | ||
my @arr = unpack('C*', $text); | ||
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for (my $i = $#arr ; $i >= 0 ; --$i) { | ||
if ($bits->[$i - 1] == 1) { | ||
splice(@arr, $i, 0, shift(@arr)); | ||
} | ||
} | ||
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pack('C*', @arr); | ||
} | ||
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# Compress file | ||
sub compress_file ($input, $output) { | ||
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open my $fh, '<:raw', $input | ||
or die "Can't open file <<$input>> for reading: $!"; | ||
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my $header = SIGNATURE; | ||
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# Open the output file for writing | ||
open my $out_fh, '>:raw', $output | ||
or die "Can't open file <<$output>> for write: $!"; | ||
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# Print the header | ||
print $out_fh $header; | ||
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# Compress data | ||
while (read($fh, (my $chunk), CHUNK_SIZE)) { | ||
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local $Compression::Util::LZ_MIN_LEN = 512; | ||
my ($t, $bits) = swap_transform(lzb_compress($chunk, \&lzss_encode_fast), 0); | ||
my $vrle_bits = binary_vrl_encode(join('', @$bits)); | ||
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if (length($vrle_bits) < scalar @$bits) { | ||
say STDERR "With VLRE: ", length($vrle_bits), " < ", scalar(@$bits); | ||
print $out_fh chr(1); | ||
} | ||
else { | ||
say STDERR "Without VRLE: ", length($vrle_bits), " > ", scalar(@$bits); | ||
$vrle_bits = join('', @$bits); | ||
print $out_fh chr(0); | ||
} | ||
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print $out_fh pack('N', length $vrle_bits); | ||
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my ($bwt, $idx) = bwt_encode($t); | ||
print $out_fh pack('B*', $vrle_bits); | ||
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my ($mtf, $alphabet) = mtf_encode(string2symbols($bwt)); | ||
my $rle = zrle_encode($mtf); | ||
print $out_fh (pack('N', $idx) . encode_alphabet($alphabet) . create_huffman_entry($rle)); | ||
} | ||
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# Close the file | ||
close $out_fh; | ||
} | ||
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# Decompress file | ||
sub decompress_file ($input, $output) { | ||
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# Open and validate the input file | ||
open my $fh, '<:raw', $input | ||
or die "Can't open file <<$input>> for reading: $!"; | ||
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valid_archive($fh) || die "$0: file `$input' is not a \U${\FORMAT}\E v${\VERSION} archive!\n"; | ||
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# Open the output file | ||
open my $out_fh, '>:raw', $output | ||
or die "Can't open file <<$output>> for writing: $!"; | ||
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while (!eof($fh)) { | ||
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my $with_vrle = ord(getc($fh)); | ||
my $bits_len = bytes2int($fh, 4); | ||
my $bits = read_bits($fh, $bits_len); | ||
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$bits = binary_vrl_decode($bits) if $with_vrle; | ||
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my $idx = bytes2int($fh, 4); | ||
my $alphabet = decode_alphabet($fh); | ||
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my $rle = decode_huffman_entry($fh); | ||
my $mtf = zrle_decode($rle); | ||
my $bwt = mtf_decode($mtf, $alphabet); | ||
my $data = bwt_decode(pack('C*', @$bwt), $idx); | ||
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print $out_fh lzb_decompress(reverse_swap_transform($data, [split(//, $bits)])); | ||
} | ||
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# Close the file | ||
close $fh; | ||
close $out_fh; | ||
} | ||
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main(); | ||
exit(0); |
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