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# This code is part of Perl distribution Mail-Message version 4.01.
# The POD got stripped from this file by OODoc version 3.05.
# For contributors see file ChangeLog.
# This software is copyright (c) 2001-2025 by Mark Overmeer.
# This is free software; you can redistribute it and/or modify it under
# the same terms as the Perl 5 programming language system itself.
# SPDX-License-Identifier: Artistic-1.0-Perl OR GPL-1.0-or-later
package Mail::Box::FastScalar;{
our $VERSION = '4.01';
}
use strict;
use warnings;
use integer;
use Log::Report 'mail-message', import => [ qw// ];
use Scalar::Util qw/blessed/;
#--------------------
sub new(;$)
{ my ($class, $ref) = @_;
(bless +{ }, $class)->open($ref);
}
sub autoflush() {}
sub binmode() {}
sub clearerr { 0 }
sub flush() {}
sub sync() { 0 }
sub opened() { $_[0]->{ref} }
sub open($)
{ my $self = $_[0];
my $ref = $self->{ref} = $_[1] // \(my $tmp);
$$ref //= '';
$self->{pos} = 0;
$self;
}
sub close() { undef $_[0]->{ref} }
sub eof()
{ my $self = $_[0];
$self->{pos} >= length ${$self->{ref}};
}
sub getc()
{ my $self = $_[0];
substr ${$self->{ref}}, $self->{pos}++, 1;
}
sub print
{ my $self = shift;
my $pos = $self->{pos};
my $ref = $self->{ref};
my $len = length $$ref;
if ($pos >= $len)
{ $$ref .= $_ for @_;
$self->{pos} = length $$ref;
}
else
{ my $buf = $#_ ? join('', @_) : $_[0];
$len = length $buf;
substr($$ref, $pos, $len) = $buf;
$self->{pos} = $pos + $len;
}
1;
}
sub read($$;$)
{ my $self = $_[0];
my $buf = substr ${$self->{ref}}, $self->{pos}, $_[2];
$self->{pos} += $_[2];
($_[3] ? substr($_[1], $_[3]) : $_[1]) = $buf;
length $buf;
}
sub sysread($$;$) { shift->read(@_) }
sub seek($$)
{ my ($self, $delta, $whence) = @_;
my $len = length ${$self->{ref}};
if ($whence == 0) { $self->{pos} = $delta }
elsif ($whence == 1) { $self->{pos} += $delta }
elsif ($whence == 2) { $self->{pos} = $len + $delta }
else { return }
if($self->{pos} > $len) { $self->{pos} = $len }
elsif($self->{pos} < 0) { $self->{pos} = 0 }
1;
}
sub sysseek($$) { $_[0]->seek($_[1], $_[2]) }
sub setpos($) { $_[0]->seek($_[1], 0) }
sub sref() { $_[0]->{ref} }
sub getpos() { $_[0]->{pos} }
sub tell() { $_[0]->{pos} }
sub write($$;$)
{ my $self = $_[0];
my $pos = $self->{pos};
my $ref = $self->{ref};
my $len = length $$ref;
if($pos >= $len)
{ $$ref .= substr($_[1], $_[3] || 0, $_[2]);
$self->{pos} = length $$ref;
$len = $self->{pos} - $len;
}
else
{ my $buf = substr($_[1], $_[3] || 0, $_[2]);
$len = length $buf;
substr($$ref, $pos, $len) = $buf;
$self->{pos} = $pos + $len;
}
$len;
}
sub syswrite($;$$) { shift->write(@_) }
sub getline()
{ my $self = shift;
my $ref = $self->{ref};
my $pos = $self->{pos};
my $idx;
if( !defined $/ || ($idx = index($$ref, $/, $pos)) == -1)
{ return if $pos >= length $$ref;
$self->{pos} = length $$ref;
return substr $$ref, $pos;
}
substr $$ref, $pos, ($self->{pos} = $idx + length $/) - $pos;
}
sub getlines()
{ my $self = $_[0];
my $ref = $self->{ref};
my $pos = $self->{pos};
my @lines;
if(defined $/)
{ my $idx;
my $sep_length = length $/;
while(($idx = index($$ref, $/, $pos)) != -1)
{ push @lines, substr($$ref, $pos, $idx + $sep_length - $pos);
$pos = $idx + $sep_length;
}
}
my $r = substr $$ref, $pos;
push @lines, $r if length $r > 0;
$self->{pos} = length $$ref;
wantarray ? @lines : \@lines;
}
# Call OO, because this module might be extended
sub TIEHANDLE { blessed $_[1] && $_[1]->isa(__PACKAGE__) ? $_[1] : shift->new(@_) }
sub GETC { shift->getc(@_) }
sub PRINT { shift->print(@_) }
sub PRINTF { shift->print(sprintf shift, @_) }
sub READ { shift->read(@_) }
sub READLINE { wantarray ? shift->getlines(@_) : shift->getline(@_) }
sub WRITE { shift->write(@_) }
sub CLOSE { shift->close(@_) }
sub SEEK { shift->seek(@_) }
sub TELL { shift->tell(@_) }
sub EOF { shift->eof(@_) }
1;
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