viewvc.cgi/VRac/Tape.pm

package Tape;

# Dobrica Pavlinusic, <dpavlin@rot13.org> 08/03/07 11:11:56 CEST

use strict;
use warnings;

use base qw/Class::Accessor/;
__PACKAGE__->mk_accessors(qw(tape tape_pos tape_rate));

use File::Slurp;
use Carp qw/confess/;

=head1 NAME

Tape - implement tape reader/recorder

=cut

=head2 read_tape

  $self->read_tape;

=cut

my $last_warn = '';

sub _warn {
        my $msg = shift;
        if ( $msg ne $last_warn ) {
                warn "$msg\n";
                $last_warn = $msg;
        }
}

my @tape_bits;

sub read_tape {
        my $self = shift;
        if ( ! $self->tape ) {
                _warn "please load tape!";
                return 0;
        }
        my $pos = $self->tape_pos;
        my $tape = $self->tape;
        if ( $pos > length( $tape ) ) {
                _warn "end of tape [$pos]";
                return -1;
        }

        if ( ! @tape_bits ) {
                my $byte = ord( substr($self->tape,$pos,1) );
                warn sprintf("tape pos %d = %02x\n", $pos, $byte);

                $pos++;
                $self->tape_pos( $pos );

                @tape_bits = split(//, unpack("B8",$byte) );
        }
        my $bit = shift @tape_bits ? 0xff : 0x00;
        warn "\t$bit\n";
        return $bit;
}

=head2 load_tape

  $self->load_tape( '/path/to/file' );

=cut

sub load_tape {
        my $self = shift;
        my $path = shift || return;

        my $tape = read_file( $path ) || confess "can't load $path: $!";

        $self->tape_pos( 0 );
        $self->tape( $tape );
        $self->tape_rate( 512 );
        warn "loaded tape $path ", -s $path, " bytes rate ", $self->tape_rate, "\n";
        return 1;
}


1;
1	package Tape;
2
3	# Dobrica Pavlinusic, <dpavlin@rot13.org> 08/03/07 11:11:56 CEST
4
5	use strict;
6	use warnings;
7
8	use base qw/Class::Accessor/;
9	__PACKAGE__->mk_accessors(qw(tape tape_pos tape_rate));
10
11	use File::Slurp;
12	use Carp qw/confess/;
13
14	=head1 NAME
15
16	Tape - implement tape reader/recorder
17
18	=cut
19
20	=head2 read_tape
21
22	$self->read_tape;
23
24	=cut
25
26	my $last_warn = '';
27
28	sub _warn {
29	my $msg = shift;
30	if ( $msg ne $last_warn ) {
31	warn "$msg\n";
32	$last_warn = $msg;
33	}
34	}
35
36	my @tape_bits;
37
38	sub read_tape {
39	my $self = shift;
40	if ( ! $self->tape ) {
41	_warn "please load tape!";
42	return 0;
43	}
44	my $pos = $self->tape_pos;
45	my $tape = $self->tape;
46	if ( $pos > length( $tape ) ) {
47	_warn "end of tape [$pos]";
48	return -1;
49	}
50
51	if ( ! @tape_bits ) {
52	my $byte = ord( substr($self->tape,$pos,1) );
53	warn sprintf("tape pos %d = %02x\n", $pos, $byte);
54
55	$pos++;
56	$self->tape_pos( $pos );
57
58	@tape_bits = split(//, unpack("B8",$byte) );
59	}
60	my $bit = shift @tape_bits ? 0xff : 0x00;
61	warn "\t$bit\n";
62	return $bit;
63	}
64
65	=head2 load_tape
66
67	$self->load_tape( '/path/to/file' );
68
69	=cut
70
71	sub load_tape {
72	my $self = shift;
73	my $path = shift \|\| return;
74
75	my $tape = read_file( $path ) \|\| confess "can't load $path: $!";
76
77	$self->tape_pos( 0 );
78	$self->tape( $tape );
79	$self->tape_rate( 512 );
80	warn "loaded tape $path ", -s $path, " bytes rate ", $self->tape_rate, "\n";
81	return 1;
82	}
83
84
85	1;