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use strict;
use warnings;
package Data::ParseBinary::Stream::StringRefReader;
our @ISA = qw{Data::ParseBinary::Stream::Reader};
__PACKAGE__->_registerStreamType("StringRef");
sub new {
my ($class, $stringref) = @_;
my $self = {
data => $stringref,
location => 0,
length => length($$stringref),
};
return bless $self, $class;
}
sub ReadBytes {
my ($self, $count) = @_;
die "not enought bytes in stream" if $self->{location} + $count > $self->{length};
my $data = substr(${ $self->{data} }, $self->{location}, $count);
$self->{location} += $count;
return $data;
}
sub ReadBits {
my ($self, $bitcount) = @_;
return $self->_readBitsForByteStream($bitcount);
}
sub tell {
my $self = shift;
return $self->{location};
}
sub seek {
my ($self, $newpos) = @_;
die "can not seek past string's end" if $newpos > $self->{length};
$self->{location} = $newpos;
}
sub isBitStream { return 0 };
package Data::ParseBinary::Stream::StringReader;
our @ISA = qw{Data::ParseBinary::Stream::StringRefReader};
__PACKAGE__->_registerStreamType("String");
sub new {
my ($class, $string) = @_;
return $class->SUPER::new(\$string);
}
package Data::ParseBinary::Stream::StringRefWriter;
our @ISA = qw{Data::ParseBinary::Stream::Writer};
__PACKAGE__->_registerStreamType("StringRef");
sub new {
my ($class, $source) = @_;
if (not defined $source) {
my $data = '';
$source = \$data;
}
my $self = {
data => $source,
offset => 0, # minus bytes from the end
};
return bless $self, $class;
}
sub tell {
my $self = shift;
return length(${ $self->{data} }) - $self->{offset};
}
sub seek {
my ($self, $newpos) = @_;
if ($newpos > length(${ $self->{data} })) {
$self->{offset} = 0;
${ $self->{data} } .= "\0" x ($newpos - length(${ $self->{data} }))
} else {
$self->{offset} = length(${ $self->{data} }) - $newpos;
}
}
sub WriteBytes {
my ($self, $data) = @_;
if ($self->{offset} == 0) {
${ $self->{data} } .= $data;
return length ${ $self->{data} };
}
substr(${ $self->{data} }, -$self->{offset}, length($data), $data);
if ($self->{offset} <= length($data)) {
$self->{offset} = 0;
} else {
$self->{offset} = $self->{offset} - length($data);
}
return length(${ $self->{data} }) - $self->{offset};
}
sub WriteBits {
my ($self, $bitdata) = @_;
return $self->_writeBitsForByteStream($bitdata);
}
sub Flush {
my $self = shift;
return $self->{data};
}
sub isBitStream { return 0 };
package Data::ParseBinary::Stream::StringWriter;
our @ISA = qw{Data::ParseBinary::Stream::StringRefWriter};
__PACKAGE__->_registerStreamType("String");
sub new {
my ($class, $source) = @_;
$source = '' unless defined $source;
return $class->SUPER::new(\$source);
}
sub Flush {
my $self = shift;
my $data = $self->SUPER::Flush();
return $$data;
}
1;
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