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# File handle that uses a string internally and can seek
# This is given as a demo for getting a zip file written
# to a string.
# I probably should just use IO::Scalar instead.
# Ned Konz, March 2000
#
# $Revision: 1.6 $
use strict;
package Archive::Zip::BufferedFileHandle;
use IO::File;
use Carp;
sub new
{
my $class = shift || __PACKAGE__;
$class = ref($class) || $class;
my $self = bless( {
content => '',
position => 0,
size => 0
}, $class );
return $self;
}
# Utility method to read entire file
sub readFromFile
{
my $self = shift;
my $fileName = shift;
my $fh = IO::File->new($fileName, "r");
CORE::binmode($fh);
if (! $fh)
{
Carp::carp("Can't open $fileName: $!\n");
return undef;
}
local $/ = undef;
$self->{content} = <$fh>;
$self->{size} = length($self->{content});
return $self;
}
sub contents
{
my $self = shift;
if (@_)
{
$self->{content} = shift;
$self->{size} = length($self->{content});
}
return $self->{content};
}
sub binmode
{ 1 }
sub close
{ 1 }
sub opened
{ 1 }
sub eof
{
my $self = shift;
return $self->{position} >= $self->{size};
}
sub seek
{
my $self = shift;
my $pos = shift;
my $whence = shift;
# SEEK_SET
if ($whence == 0) { $self->{position} = $pos; }
# SEEK_CUR
elsif ($whence == 1) { $self->{position} += $pos; }
# SEEK_END
elsif ($whence == 2) { $self->{position} = $self->{size} + $pos; }
else { return 0; }
return 1;
}
sub tell
{ return shift->{position}; }
# Copy my data to given buffer
sub read
{
my $self = shift;
my $buf = \($_[0]); shift;
my $len = shift;
my $offset = shift || 0;
$$buf = '' if not defined($$buf);
my $bytesRead = ($self->{position} + $len > $self->{size})
? ($self->{size} - $self->{position})
: $len;
substr($$buf, $offset, $bytesRead)
= substr($self->{content}, $self->{position}, $bytesRead);
$self->{position} += $bytesRead;
return $bytesRead;
}
# Copy given buffer to me
sub write
{
my $self = shift;
my $buf = \($_[0]); shift;
my $len = shift;
my $offset = shift || 0;
$$buf = '' if not defined($$buf);
my $bufLen = length($$buf);
my $bytesWritten = ($offset + $len > $bufLen)
? $bufLen - $offset
: $len;
substr($self->{content}, $self->{position}, $bytesWritten)
= substr($$buf, $offset, $bytesWritten);
$self->{size} = length($self->{content});
return $bytesWritten;
}
sub clearerr() { 1 }
# vim: ts=4 sw=4
1;
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