Pardus: audiofile: Heap Overflow

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cache::file::heap

Cache::File::Heap(3pm)					User Contributed Perl Documentation				    Cache::File::Heap(3pm)

NAME

       Cache::File::Heap - A file based heap for use by Cache::File

SYNOPSIS

	 use Cache::File::Heap;

	 $heap = Cache::File::Heap->new('/path/to/some/heap/file');
	 $heap->add($key, $val);
	 ($key, $val) = $heap->minimum;
	 ($key, $val) = $heap->extract_minimum;
	 $heap->delete($key, $val);

DESCRIPTION

       This module is a wrapper around a Berkeley DB using a btree structure to implement a heap.  It is specifically for use by Cache::File for
       storing expiry times (although with a bit of work it could be made more general).

       See LIMITATIONS below.

CONSTRUCTOR

	 my $heap = Cache::File::Heap->new( [$dbfile] );

       The heap constructor takes an optional argument which is the name of the database file to open.	If specified, it will attempt to open the
       database during construction.  A new Cache::File::Heap blessed reference will be returned, or undef if the open failed.

METHODS

       $h->open($dbfile)
	   Opens the specified database file.

       $h->close()
	   Closes a previously opened heap database.  Note that the database will be automatically closed when the heap reference is destroyed.

       $h->add($key, $val)
	   Adds a key and value pair to the heap.  Currently the key should be a number, whilst the value may be any scalar.  Invokes 'die' on
	   failure (use eval to catch it).

       $h->delete($key, $val)
	   Removes a key and value pair from the heap.	Returns 1 if the pair was found and removed, or 0 otherwise.

       ($key, $val) = $h->minimum()
	   In list context, returns the smallest key and value pair from the heap.  In scalar context only the key is returned.  Note smallest is
	   defined via a numerical comparison (hence keys should always be numbers).

       ($key, $vals) = $h->minimum_dup()
	   In list context, returns the smallest key and an array reference containing all the values for that key from the heap.  In scalar
	   context only the key is returned.

       ($key, $val) = $h->extract_minimum()
	   As for $h->minimum(), but the key and value pair is removed from the heap.

       ($key, $vals) = $h->extract_minimum_dup()
	   As for $h->minimum_dup(), but all the values are removed from the heap.

SEE ALSO

       Cache::File

AUTHOR

	Chris Leishman <chris@leishman.org>
	Based on work by DeWitt Clinton <dewitt@unto.net>

COPYRIGHT

	Copyright (C) 2003-2006 Chris Leishman.  All Rights Reserved.

       This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. This program is free software;
       you can redistribute or modify it under the same terms as Perl itself.

       $Id: Heap.pm,v 1.6 2006/01/31 15:23:58 caleishm Exp $

perl v5.12.4							    2011-08-05						    Cache::File::Heap(3pm)

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