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=head1 NAME |
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Convert::CD - import/export/represent various cd image file formats |
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=head1 SYNOPSIS |
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use Convert::CD; |
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|
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# to be done |
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|
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=head1 DESCRIPTION |
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|
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Kidding? |
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|
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=head2 Convert:CD METHODS |
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This class represents a full CD image, which can consist of one or more |
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files. While track layout and TOC data is stored in this class, to |
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read/write TOC files you need a Convert::CD::TOCFile. |
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|
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=over 4 |
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|
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=cut |
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|
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package Convert::CD; |
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|
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$VERSION = 0.01; |
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|
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use base Exporter; |
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|
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=item new param => value... |
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Create a new Convert::CD object. |
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my $cd = new path => "/tmp/mycd.bin"; |
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|
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=cut |
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sub new { |
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my $class = shift; |
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my $self = bless { |
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track => [], # an array of tracks, track #1 is in index 0 |
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@_, |
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}, $class; |
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$self; |
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} |
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=item $cd->append_track(param => value...) |
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Appends a new track to the image. Same parameters as Convert::CD::Track->new. |
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=cut |
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sub append_track { |
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my ($self, %arg) = @_; |
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|
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push @{$self->{track}}, Convert::CD::Track->new (%arg); |
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} |
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=item $cd->as_string |
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Returns a multi-line, textual description of the CD Image. |
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=cut |
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sub as_string { |
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my ($self) = @_; |
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my $r; |
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$r .= "Image Path: $self->{path}\n"; |
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for my $idx (1 .. @{$self->{track}}) { |
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$r .= sprintf "Track %02d: %s\n", $idx, $self->{track}[$idx - 1]->as_string; |
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} |
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$r; |
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} |
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=item $cd->track ([$idx]) |
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Returns the track with the given index, or, if no index is given, all the |
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tracks of the CD (or the number of tracks in scalar context). The first |
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track is track #1. |
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|
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=cut |
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|
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sub track { |
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my ($self, $idx) = @_; |
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@_ > 1 ? $self->{track}[$idx - 1] : @{$self->{track}}; |
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} |
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package Convert::CD::Track; |
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|
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use POSIX qw(ceil); |
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use Carp; |
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|
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=back |
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|
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=head2 Convert::CD::Track METHODS |
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This class is used to repesent single track objects. |
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=over 4 |
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=item new param => value... |
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Create a new track object. |
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Parameters: |
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path the file that contains the track |
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offset the offste within the file that contains the first sector |
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(may be negative) |
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rawsize the raw size (in bytes) of the track. (guessed if missing) |
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mode a mode string (MODE1, MODE2, AUDIO, CDI, CDG....) |
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datasize size of the data part of the sector (e.g. 2048). (def. secsize) |
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secsize size of a sector in disk image |
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index an array of index times (0 is pregap start, 1 is track start) |
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|
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=cut |
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|
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sub new { |
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my $class = shift; |
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my $self = bless { |
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@_, |
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}, $class; |
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$self->{rawsize} ||= (-s $self->{path}) - $self->{offset}; |
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$self->{datasize} ||= $self->{secsize}; |
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$self; |
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} |
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# create and cache a filehandle of the given mode |
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sub fh { |
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my ($self, $mode) = @_; |
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$self->{fh}{$mode} ||= do { |
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open my $fh, $mode, $self->{path} |
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or croak "$self->{path}: $!"; |
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binmode $fh; # *seufz* |
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$fh; |
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}; |
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} |
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=item $track->read ($offset, $length) |
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Reads and returns a part of the track. C<$offset> should be a multiple of |
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the datasize. |
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=cut |
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sub read { |
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my ($self, $offset, $length) = @_; |
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my $buf; |
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my $fh = $self->fh ("<"); |
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$offset = $offset / $self->{secsize} * $self->{secsize}; |
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while ($length > 0) { |
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sysseek $fh, $self->{offset} + $offset, 0 |
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or croak "seek($self->{path}): $!"; |
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sysread $fh, $buf, ($length < $self->{datasize} ? $length : $self->{datasize}), length $buf |
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or croak "read($self->{path}): $!"; |
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$length -= $self->{datasize}; |
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$offset += $self->{secsize}; |
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} |
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$buf; |
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} |
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=item $track->size |
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Returns the (cooked) size of the track in bytes, i.e. logical size of the |
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track without any ECC etc. information. |
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=cut |
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sub size { |
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my ($self) = @_; |
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ceil ($self->{rawsize} / $self->{secsize}) * $self->{datasize}; |
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} |
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=item $track->as_string |
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Returns a single-line, textual description of the track. |
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=cut |
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sub as_string { |
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my ($self) = @_; |
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my %data = %$self; |
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$data{index} = "<" . (join "|", @{$data{index}}) .">"; |
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sprintf "%s %08x+%08x %s/%d (%s)", |
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delete @data{qw(path offset rawsize mode secsize)}, |
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join " ", %data; |
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} |
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1; |
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=back |
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=head1 AUTHOR |
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|
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Marc Lehmann <pcg@goof.com> |
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=cut |
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