0.6.9
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bin/lib/Image/ExifTool/Torrent.pm
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317
bin/lib/Image/ExifTool/Torrent.pm
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#------------------------------------------------------------------------------
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# File: Torrent.pm
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#
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# Description: Read information from BitTorrent file
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#
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# Revisions: 2013/08/27 - P. Harvey Created
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#
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# References: 1) https://wiki.theory.org/BitTorrentSpecification
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#------------------------------------------------------------------------------
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package Image::ExifTool::Torrent;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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$VERSION = '1.03';
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sub ReadBencode($$);
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sub ExtractTags($$$;$$@);
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# tags extracted from BitTorrent files
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%Image::ExifTool::Torrent::Main = (
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GROUPS => { 2 => 'Document' },
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NOTES => q{
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Below are tags commonly found in BitTorrent files. As well as these tags,
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any other existing tags will be extracted. For convenience, list items are
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expanded into individual tags with an index in the tag name, but only the
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tags with index "1" are listed in the tables below. See
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L<https://wiki.theory.org/BitTorrentSpecification> for the BitTorrent
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specification.
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},
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'announce' => { },
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'announce-list' => { Name => 'AnnounceList1' },
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'comment' => { },
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'created by' => { Name => 'Creator' }, # software used to create the torrent
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'creation date' => {
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Name => 'CreateDate',
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Groups => { 2 => 'Time' },
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ValueConv => 'ConvertUnixTime($val,1)',
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PrintConv => '$self->ConvertDateTime($val)',
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},
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'encoding' => { },
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'info' => { SubDirectory => { TagTable => 'Image::ExifTool::Torrent::Info' } },
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'url-list' => { Name => 'URLList1' },
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);
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%Image::ExifTool::Torrent::Info = (
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GROUPS => { 2 => 'Document' },
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'file-duration' => { Name => 'File1Duration' },
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'file-media' => { Name => 'File1Media' },
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'files' => { SubDirectory => { TagTable => 'Image::ExifTool::Torrent::Files' } },
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'length' => { },
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'md5sum' => { Name => 'MD5Sum' },
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'name' => { },
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'name.utf-8' => { Name => 'NameUTF-8' },
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'piece length' => { Name => 'PieceLength' },
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'pieces' => {
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Name => 'Pieces',
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Notes => 'concatenation of 20-byte SHA-1 digests for each piece',
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},
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'private' => { },
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'profiles' => { SubDirectory => { TagTable => 'Image::ExifTool::Torrent::Profiles' } },
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);
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%Image::ExifTool::Torrent::Profiles = (
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GROUPS => { 2 => 'Document' },
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'width' => { Name => 'Profile1Width' },
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'height' => { Name => 'Profile1Height' },
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'acodec' => { Name => 'Profile1AudioCodec' },
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'vcodec' => { Name => 'Profile1VideoCodec' },
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);
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%Image::ExifTool::Torrent::Files = (
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GROUPS => { 2 => 'Document' },
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'length' => { Name => 'File1Length', PrintConv => 'ConvertFileSize($val)' },
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'md5sum' => { Name => 'File1MD5Sum' },
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'path' => { Name => 'File1Path', JoinPath => 1 },
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'path.utf-8' => { Name => 'File1PathUTF-8', JoinPath => 1 },
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);
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#------------------------------------------------------------------------------
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# Read 64kB more data into buffer
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# Inputs: 0) RAF ref, 1) buffer ref
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# Returns: number of bytes read
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# Notes: Sets BencodeEOF element of RAF on end of file
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sub ReadMore($$)
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{
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my ($raf, $dataPt) = @_;
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my $buf2;
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my $n = $raf->Read($buf2, 65536);
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$$raf{BencodeEOF} = 1 if $n != 65536;
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$$dataPt = substr($$dataPt, pos($$dataPt)) . $buf2 if $n;
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return $n;
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}
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#------------------------------------------------------------------------------
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# Read bencoded value
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# Inputs: 0) input file, 1) buffer (pos must be set to current position)
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# Returns: HASH ref, ARRAY ref, SCALAR ref, SCALAR, or undef on error or end of data
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# Notes: Sets BencodeError element of RAF on any error
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sub ReadBencode($$)
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{
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my ($raf, $dataPt) = @_;
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# read more if necessary (keep a minimum of 64 bytes in the buffer)
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my $pos = pos($$dataPt);
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return undef unless defined $pos;
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my $remaining = length($$dataPt) - $pos;
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ReadMore($raf, $dataPt) if $remaining < 64 and not $$raf{BencodeEOF};
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# read next token
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$$dataPt =~ /(.)/sg or return undef;
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my $val;
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my $tok = $1;
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if ($tok eq 'i') { # integer
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$$dataPt =~ /\G(-?\d+)e/g or return $val;
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$val = $1;
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} elsif ($tok eq 'd') { # dictionary
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$val = { };
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for (;;) {
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my $k = ReadBencode($raf, $dataPt);
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last unless defined $k;
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# the key must be a byte string
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if (ref $k) {
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ref $k ne 'SCALAR' and $$raf{BencodeError} = 'Bad dictionary key', last;
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$k = $$k;
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}
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my $v = ReadBencode($raf, $dataPt);
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last unless defined $v;
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$$val{$k} = $v;
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}
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} elsif ($tok eq 'l') { # list
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$val = [ ];
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for (;;) {
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my $v = ReadBencode($raf, $dataPt);
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last unless defined $v;
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push @$val, $v;
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}
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} elsif ($tok eq 'e') { # end of dictionary or list
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# return undef (no error)
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} elsif ($tok =~ /^\d$/ and $$dataPt =~ /\G(\d*):/g) { # byte string
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my $len = $tok . $1;
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my $more = $len - (length($$dataPt) - pos($$dataPt));
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my $value;
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if ($more <= 0) {
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$value = substr($$dataPt,pos($$dataPt),$len);
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pos($$dataPt) = pos($$dataPt) + $len;
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} elsif ($more > 10000000) {
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# just skip over really long values
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$val = \ "(Binary data $len bytes)" if $raf->Seek($more, 1);
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} else {
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# need to read more from file
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my $buff;
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my $n = $raf->Read($buff, $more);
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if ($n == $more) {
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$value = substr($$dataPt,pos($$dataPt)) . $buff;
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$$dataPt = '';
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pos($$dataPt) = 0;
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}
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}
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if (defined $value) {
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# return as binary data unless it is a reasonable-length ASCII string
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if (length($value) > 256 or $value =~ /[^\t\x20-\x7e]/) {
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$val = \$value;
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} else {
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$val = $value;
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}
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} elsif (not defined $val) {
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$$raf{BencodeError} = 'Truncated byte string';
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}
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} else {
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$$raf{BencodeError} = 'Bad format';
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}
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return $val;
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}
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#------------------------------------------------------------------------------
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# Extract tags from dictionary hash
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# Inputs: 0) ExifTool ref, 1) dictionary hash reference, 2) tag table ref,
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# 3) parent hash ID, 4) parent hash name, 5-N) list indices
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# Returns: number of tags extracted
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sub ExtractTags($$$;$$@)
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{
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my ($et, $hashPtr, $tagTablePtr, $baseID, $baseName, @index) = @_;
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my $count = 0;
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my $tag;
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foreach $tag (sort keys %$hashPtr) {
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my $val = $$hashPtr{$tag};
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my ($i, $j, @more);
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for (; defined $val; $val = shift @more) {
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my $id = defined $baseID ? "$baseID/$tag" : $tag;
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unless ($$tagTablePtr{$id}) {
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my $name = ucfirst $tag;
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# capitalize all words in tag name and remove illegal characters
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$name =~ s/[^-_a-zA-Z0-9]+(.?)/\U$1/g;
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$name = "Tag$name" if length($name) < 2 or $name !~ /^[A-Z]/;
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$name = $baseName . $name if defined $baseName; # add base name if necessary
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AddTagToTable($tagTablePtr, $id, { Name => $name });
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$et->VPrint(0, " [adding $id '${name}']\n");
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}
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my $tagInfo = $et->GetTagInfo($tagTablePtr, $id) or next;
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if (ref $val eq 'ARRAY') {
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if ($$tagInfo{JoinPath}) {
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$val = join '/', @$val;
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} else {
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push @more, @$val;
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next if ref $more[0] eq 'ARRAY'; # continue expanding nested lists
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$val = shift @more;
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$i or $i = 0, push(@index, $i);
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}
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}
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$index[-1] = ++$i if defined $i;
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if (@index) {
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$id .= join '_', @index; # add instance number(s) to tag ID
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unless ($$tagTablePtr{$id}) {
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my $name = $$tagInfo{Name};
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# embed indices at position of '1' in tag name
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my $n = ($name =~ tr/1/#/);
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for ($j=0; $j<$n; ++$j) {
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my $idx = $index[$j] || '';
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$name =~ s/#/$idx/;
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}
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# put remaining indices at end of tag name
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for (; $j<@index; ++$j) {
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$name .= '_' if $name =~ /\d$/;
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$name .= $index[$j];
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}
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AddTagToTable($tagTablePtr, $id, { %$tagInfo, Name => $name });
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}
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$tagInfo = $et->GetTagInfo($tagTablePtr, $id) or next;
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}
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if (ref $val eq 'HASH') {
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# extract tags from this dictionary
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my ($table, $rootID, $rootName);
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if ($$tagInfo{SubDirectory}) {
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$table = GetTagTable($$tagInfo{SubDirectory}{TagTable});
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} else {
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$table = $tagTablePtr;
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# use hash ID and Name as base for contained tags to avoid conflicts
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$rootID = $id;
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$rootName = $$tagInfo{Name};
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}
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$count += ExtractTags($et, $val, $table, $rootID, $rootName, @index);
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} else {
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# handle this simple tag value
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$et->HandleTag($tagTablePtr, $id, $val);
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++$count;
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}
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}
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pop @index if defined $i;
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}
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return $count;
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}
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#------------------------------------------------------------------------------
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# Process BitTorrent file
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference (with RAF set)
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# Returns: 1 on success, 0 if this wasn't a valid BitTorrent file
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sub ProcessTorrent($$)
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{
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my ($et, $dirInfo) = @_;
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my $success = 0;
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my $raf = $$dirInfo{RAF};
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my $buff = '';
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pos($buff) = 0;
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my $dict = ReadBencode($raf, \$buff);
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my $err = $$raf{BencodeError};
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$et->Warn("Bencode error: $err") if $err;
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if (ref $dict eq 'HASH' and $$dict{announce}) {
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$et->SetFileType();
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my $tagTablePtr = GetTagTable('Image::ExifTool::Torrent::Main');
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ExtractTags($et, $dict, $tagTablePtr) and $success = 1;
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}
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return $success;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::Torrent - Read information from BitTorrent file
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to read
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bencoded information from BitTorrent files.
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=head1 AUTHOR
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Copyright 2003-2018, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<https://wiki.theory.org/BitTorrentSpecification>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/Torrent Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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