Memory.php
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* A reader that takes its input from a memory buffer
*
* PHP versions 4 and 5
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330,Boston,MA 02111-1307 USA
*
* @category File Formats
* @package File_Archive
* @author Vincent Lascaux <vincentlascaux@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.gnu.org/copyleft/lesser.html LGPL
* @version CVS: $Id: Memory.php,v 1.19 2005/06/19 20:09:57 vincentlascaux Exp $
* @link http://pear.php.net/package/File_Archive
*/
require_once "File/Archive/Reader.php";
/**
* A reader that takes its input from a memory buffer
*/
class File_Archive_Reader_Memory extends File_Archive_Reader
{
/**
* @var String Name of the file exported by this reader
* @access private
*/
var $filename;
/**
* @var Array Stat of the file exported by this reader
* @access private
*/
var $stat;
/**
* @var String MIME type of the file exported by this reader
* @access private
*/
var $mime;
/**
* @var String Memory buffer that contains the data of the file
* @access private
*/
var $memory;
/**
* @var Int Current position in the file
* @access private
*/
var $offset = 0;
/**
* @var Boolean Has the file already been read
* @access private
*/
var $alreadyRead = false;
/**
* @param string $memory is the content of the file.
* This parameter is passed as a reference for performance
* reasons. The content should not be changer after the constructor
* @param string $filename is the name of the file
* @param array $stat are the statistics of the file. The size will be
* recomputed from $memory
* @param string $mime is the mime type of the file
*/
function File_Archive_Reader_Memory(&$memory, $filename,
$stat=array(), $mime=null)
{
$this->memory = &$memory;
$this->filename = $this->getStandardURL($filename);
$this->stat = $stat;
$this->stat[7] = $this->stat['size'] = strlen($this->memory);
$this->mime = $mime;
}
/**
* The subclass should overwrite this function to change the filename, stat
* and memory
*/
function next()
{
if ($this->alreadyRead) {
return false;
} else {
$this->alreadyRead = true;
return true;
}
}
/**
* @see File_Archive_Reader::getFilename()
*/
function getFilename() { return $this->filename; }
/**
* @see File_Archive_Reader::getStat()
*/
function getStat() { return $this->stat; }
/**
* @see File_Archive_Reader::getMime()
*/
function getMime()
{
return $this->mime==null ? parent::getMime() : $this->mime;
}
/**
* @see File_Archive_Reader::getData()
*/
function getData($length = -1)
{
if ($this->offset == strlen($this->memory)) {
return null;
}
if ($length == -1) {
$actualLength = strlen($this->memory) - $this->offset;
} else {
$actualLength = min($length, strlen($this->memory) - $this->offset);
}
$result = substr($this->memory, $this->offset, $actualLength);
$this->offset += $actualLength;
return $result;
}
/**
* @see File_Archive_Reader::skip()
*/
function skip($length = -1)
{
if ($length == -1) {
$length = strlen($this->memory) - $this->offset;
} else {
$length = min($length, strlen($this->memory) - $this->offset);
}
$this->offset += $length;
return $length;
}
/**
* @see File_Archive_Reader::rewind()
*/
function rewind($length = -1)
{
if ($length == -1) {
$tmp = $this->offset;
$this->offset = 0;
return $tmp;
} else {
$length = min($length, $this->offset);
$this->offset -= $length;
return $length;
}
}
/**
* @see File_Archive_Reader::tell()
*/
function tell()
{
return $this->offset;
}
/**
* @see File_Archive_Reader::close()
*/
function close()
{
$this->offset = 0;
$this->alreadyRead = false;
}
/**
* @see File_Archive_Reader::makeAppendWriter()
*/
function makeAppendWriter()
{
return PEAR::raiseError('Unable to append files to a memory archive');
}
/**
* @see File_Archive_Reader::makeWriterRemoveFiles()
*/
function makeWriterRemoveFiles($pred)
{
return PEAR::raiseError('Unable to remove files from a memory archive');
}
/**
* @see File_Archive_Reader::makeWriterRemoveBlocks()
*/
function makeWriterRemoveBlocks($blocks, $seek = 0)
{
require_once "File/Archive/Writer/Memory.php";
$data = substr($this->memory, 0, $this->offset + $seek);
$this->memory = substr($this->memory, $this->offset + $seek);
$keep = false;
foreach ($blocks as $length) {
if ($keep) {
$data .= substr($this->memory, 0, $length);
}
$this->memory = substr($this->memory, $length);
$keep = !$keep;
}
if ($keep) {
$this->memory = $data . $this->memory;
} else {
$this->memory = $data;
}
$this->close();
return new File_Archive_Writer_Memory($this->memory, strlen($this->memory));
}
}
?>