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dpavlin |
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package Tape; |
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# Dobrica Pavlinusic, <dpavlin@rot13.org> 08/03/07 11:11:56 CEST |
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use strict; |
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use warnings; |
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use base qw/Class::Accessor/; |
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dpavlin |
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__PACKAGE__->mk_accessors(qw(tape tape_pos tape_rate trace)); |
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dpavlin |
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use File::Slurp; |
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use Carp qw/confess/; |
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=head1 NAME |
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Tape - implement tape reader/recorder |
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=cut |
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=head2 read_tape |
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$self->read_tape; |
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=cut |
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my $last_warn = ''; |
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sub _warn { |
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my $msg = shift; |
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if ( $msg ne $last_warn ) { |
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warn "$msg\n"; |
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$last_warn = $msg; |
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} |
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} |
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my @tape_bits; |
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sub read_tape { |
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my $self = shift; |
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if ( ! $self->tape ) { |
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_warn "please load tape!"; |
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return 0; |
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} |
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my $pos = $self->tape_pos; |
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my $tape = $self->tape; |
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if ( $pos > length( $tape ) ) { |
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_warn "end of tape [$pos]"; |
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return -1; |
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} |
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if ( ! @tape_bits ) { |
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my $byte = ord( substr($self->tape,$pos,1) ); |
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warn sprintf("tape pos %d = %02x\n", $pos, $byte) if $self->trace; |
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$pos++; |
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$self->tape_pos( $pos ); |
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@tape_bits = split(//, unpack("B8",$byte) ); |
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} |
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my $bit = shift @tape_bits ? 0xff : 0x00; |
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warn "\t$bit\n" if $self->trace; |
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return $bit; |
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} |
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=head2 load_tape |
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$self->load_tape( '/path/to/file' ); |
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=cut |
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sub load_tape { |
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my $self = shift; |
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my $path = shift || return; |
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my $tape = read_file( $path ) || confess "can't load $path: $!"; |
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$self->tape_pos( 0 ); |
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$self->tape( $tape ); |
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$self->tape_rate( 512 ); |
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warn "loaded tape $path ", -s $path, " bytes rate ", $self->tape_rate, "\n"; |
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return 1; |
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} |
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1; |