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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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__PACKAGE__->mk_accessors(qw(tape tape_path tape_pos trace)); |
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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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my $byte = $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 $c_0 = 0; |
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my $c_1 = 0; |
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my $mask = 1; |
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my $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 ( $c_0 ) { |
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$c_0--; |
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$bits .= "."; |
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return 0; |
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} |
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if ( $c_1 ) { |
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$c_1--; |
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$bits .= "X"; |
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return 255; |
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} |
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$mask = $mask << 1; |
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if ( $mask > 0x80 ) { |
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$pos++; |
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$self->tape_pos( $pos ); |
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$mask = 1; |
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warn "# $bits\n"; |
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$bits = ''; |
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}; |
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my $byte = ord( substr($self->tape,$pos,1) ); |
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my $bit = $byte & $mask; |
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warn sprintf("tape pos %d 0x%04x mask %02x and %02x = %d\n", $pos, $pos, $mask, $byte, $bit); # if $self->trace; |
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( $c_0, $c_1 ) = ( 0x17, 0x17 ); |
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( $c_0, $c_1 ) = ( 0x30, 0x30 ) if $bit; |
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return 0; |
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} |
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=head2 write_tape |
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$self->write_tape( $byte ); |
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=cut |
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sub write_tape { |
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my ( $self, $byte ) = @_; |
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$self->append_to_file( 'tape.dmp', $byte ); |
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return $byte; |
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} |
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=head2 load_tape |
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$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_path( $path ); |
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$self->tape_pos( 0 ); |
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$self->tape( $tape ); |
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warn "loaded tape $path ", -s $path, " bytes\n"; |
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return 1; |
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} |
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=head2 tape_status |
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print $self->tape_status; |
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=cut |
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sub tape_status { |
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my $self = shift; |
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return "No tape in (simulated) drive" unless $self->tape; |
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my $size = length( $self->tape ); |
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return sprintf( |
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"tape file: %s with %d 0x%x bytes, current position: %d 0x%x", |
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$self->tape_path, $size, $size, $self->pos, $self->pos, |
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); |
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} |
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=head1 SEE ALSO |
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L<VRac> |
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=cut |
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1; |