diff --git a/Compression/High-level/sbwt_file_compression.pl b/Compression/High-level/sbwt_file_compression.pl new file mode 100644 index 0000000..2cc90ea --- /dev/null +++ b/Compression/High-level/sbwt_file_compression.pl @@ -0,0 +1,224 @@ +#!/usr/bin/perl + +# Author: Daniel "Trizen" Șuteu +# Date: 09 November 2024 +# https://github.com/trizen + +# Compress/decompress files using SWAP transform + LZB + Burrows-Wheeler Transform (BWT) + Move-to-Front Transform + Run-length encoding + Huffman coding. + +# Reference: +# Data Compression (Summer 2023) - Lecture 13 - BZip2 +# https://youtube.com/watch?v=cvoZbBZ3M2A + +use 5.036; +use Getopt::Std qw(getopts); +use File::Basename qw(basename); +use Compression::Util qw(:all); +use POSIX qw(ceil); + +use constant { + PKGNAME => 'SBWT', + VERSION => '0.01', + FORMAT => 'sbwt', + + CHUNK_SIZE => 1 << 17, +}; + +# Container signature +use constant SIGNATURE => uc(FORMAT) . chr(1); + +sub usage { + my ($code) = @_; + print <<"EOH"; +usage: $0 [options] [input file] [output file] + +options: + -e : extract + -i : input filename + -o : 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 + + exit($code // 0); +} + +sub version { + printf("%s %s\n", PKGNAME, VERSION); + exit; +} + +sub valid_archive { + my ($fh) = @_; + + if (read($fh, (my $sig), length(SIGNATURE), 0) == length(SIGNATURE)) { + $sig eq SIGNATURE || return; + } + + return 1; +} + +sub main { + my %opt; + getopts('ei:o:vhr', \%opt); + + $opt{h} && usage(0); + $opt{v} && version(); + + my ($input, $output) = @ARGV; + $input //= $opt{i} // usage(2); + $output //= $opt{o}; + + my $ext = qr{\.${\FORMAT}\z}io; + if ($opt{e} || $input =~ $ext) { + + if (not defined $output) { + ($output = basename($input)) =~ s{$ext}{} + || die "$0: no output file specified!\n"; + } + + if (not $opt{r} and -e $output) { + print "'$output' already exists! -- Replace? [y/N] "; + =~ /^y/i || exit 17; + } + + 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 "$0: don't know what to do...\n"; + usage(1); + } +} + +sub swap_transform ($text, $extra = 1) { + + my @bits; + my @arr = unpack('C*', $text); + my $k = 0; + + foreach my $i (1 .. $#arr) { + if ($arr[$i] < $arr[$i - 1 - $k]) { + push @bits, 1; + unshift @arr, splice(@arr, $i, 1); + ++$k if $extra; + } + else { + push @bits, 0; + } + } + + return (pack('C*', @arr), \@bits); +} + +sub reverse_swap_transform ($text, $bits) { + my @arr = unpack('C*', $text); + + for (my $i = $#arr ; $i >= 0 ; --$i) { + if ($bits->[$i - 1] == 1) { + splice(@arr, $i, 0, shift(@arr)); + } + } + + pack('C*', @arr); +} + +# Compress file +sub compress_file ($input, $output) { + + open my $fh, '<:raw', $input + or die "Can't open file <<$input>> for reading: $!"; + + my $header = SIGNATURE; + + # Open the output file for writing + open my $out_fh, '>:raw', $output + or die "Can't open file <<$output>> for write: $!"; + + # Print the header + print $out_fh $header; + + # Compress data + while (read($fh, (my $chunk), CHUNK_SIZE)) { + + 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)); + + 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); + } + + print $out_fh pack('N', length $vrle_bits); + + my ($bwt, $idx) = bwt_encode($t); + print $out_fh pack('B*', $vrle_bits); + + my ($mtf, $alphabet) = mtf_encode(string2symbols($bwt)); + my $rle = zrle_encode($mtf); + print $out_fh (pack('N', $idx) . encode_alphabet($alphabet) . create_huffman_entry($rle)); + } + + # Close the file + close $out_fh; +} + +# Decompress file +sub decompress_file ($input, $output) { + + # Open and validate the input file + open my $fh, '<:raw', $input + or die "Can't open file <<$input>> for reading: $!"; + + valid_archive($fh) || die "$0: file `$input' is not a \U${\FORMAT}\E v${\VERSION} archive!\n"; + + # Open the output file + open my $out_fh, '>:raw', $output + or die "Can't open file <<$output>> for writing: $!"; + + while (!eof($fh)) { + + my $with_vrle = ord(getc($fh)); + my $bits_len = bytes2int($fh, 4); + my $bits = read_bits($fh, $bits_len); + + $bits = binary_vrl_decode($bits) if $with_vrle; + + my $idx = bytes2int($fh, 4); + my $alphabet = decode_alphabet($fh); + + 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); + + print $out_fh lzb_decompress(reverse_swap_transform($data, [split(//, $bits)])); + } + + # Close the file + close $fh; + close $out_fh; +} + +main(); +exit(0); diff --git a/README.md b/README.md index def54f6..acce888 100644 --- a/README.md +++ b/README.md @@ -146,6 +146,7 @@ A nice collection of day-to-day Perl scripts. * [Myzlib file compression](./Compression/High-level/myzlib_file_compression.pl) * [Rablz file compression](./Compression/High-level/rablz_file_compression.pl) * [Rlzss file compression](./Compression/High-level/rlzss_file_compression.pl) + * [Sbwt file compression](./Compression/High-level/sbwt_file_compression.pl) * [Xz file compression](./Compression/High-level/xz_file_compression.pl) * [Zlib file compression](./Compression/High-level/zlib_file_compression.pl) * [Zstd file compression](./Compression/High-level/zstd_file_compression.pl)