262 Zeilen
7.7 KiB
PHP
262 Zeilen
7.7 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* This reader caches the files of another reader
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* It allow fast access to files. This is usefull if the access to the reader
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* is slow (HTTP, FTP...), but will need more IO if the file is only extracted
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*
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* PHP versions 4 and 5
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330,Boston,MA 02111-1307 USA
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*
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* @category File Formats
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* @package File_Archive
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* @author Vincent Lascaux <vincentlascaux@php.net>
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* @copyright 1997-2005 The PHP Group
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* @license http://www.gnu.org/copyleft/lesser.html LGPL
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* @version CVS: $Id: Cache.php 2 2010-11-23 14:32:26Z oldperl $
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* @link http://pear.php.net/package/File_Archive
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*/
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require_once "File/Archive/Reader.php";
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/**
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* This reader caches the files of another reader
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* It allow fast access to files. This is usefull if the access to the reader
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* is slow (HTTP, FTP...), but will need more IO if the file is only extracted
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*/
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class File_Archive_Reader_Cache extends File_Archive_Reader
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{
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var $tmpFile;
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var $files = array();
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var $pos = 0;
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var $fromSource = true;
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var $endOfSource = false;
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var $source;
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/**
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* $source is the reader to filter
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*/
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function File_Archive_Reader_Cache(&$source)
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{
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$this->source =& $source;
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$this->tmpFile = tmpfile();
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}
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function _writeEndOfFile()
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{
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$bufferSize = File_Archive::getOption('blockSize');
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while (($data = $this->source->getData($bufferSize))!=null) {
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fwrite($this->tmpFile, $data);
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}
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}
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/**
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* @see File_Archive_Reader::next()
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*/
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function next()
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{
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//Write the end of the current file to the temp file
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if ($this->fromSource && !empty($this->files)) {
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$this->_writeEndOfFile();
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}
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if ($this->pos+1 < count($this->files) && !$this->fromSource) {
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$this->pos++;
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fseek($this->tmpFile, $this->files[$this->pos]['pos'], SEEK_SET);
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return true;
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} else {
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$this->fromSource = true;
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if ($this->endOfSource) {
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return false;
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}
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$ret = $this->source->next();
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if ($ret !== true) {
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$this->endOfSource = true;
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$this->source->close();
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return $ret;
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}
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$this->endOfSource = false;
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fseek($this->tmpFile, 0, SEEK_END);
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$this->files[] = array(
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'name' => $this->source->getFilename(),
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'stat' => $this->source->getStat(),
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'mime' => $this->source->getMime(),
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'pos' => ftell($this->tmpFile)
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);
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$this->pos = count($this->files)-1;
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return true;
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}
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}
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/**
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* @see File_Archive_Reader::getFilename()
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*/
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function getFilename() { return $this->files[$this->pos]['name']; }
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/**
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* @see File_Archive_Reader::getStat()
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*/
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function getStat() { return $this->files[$this->pos]['stat']; }
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/**
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* @see File_Archive_Reader::getMime()
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*/
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function getMime() { return $this->files[$this->pos]['mime']; }
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/**
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* @see File_Archive_Reader::getDataFilename()
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*/
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function getDataFilename() { return null; }
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/**
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* @see File_Archive_Reader::getData()
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*/
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function getData($length = -1)
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{
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if ($this->fromSource) {
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$data = $this->source->getData($length);
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if (PEAR::isError($data)) {
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return $data;
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}
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fwrite($this->tmpFile, $data);
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return $data;
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} else {
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if ($length == 0) {
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return '';
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}
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if ($length > 0 && $this->pos+1 < count($this->files)) {
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$maxSize = $this->files[$this->pos+1]['pos'] - ftell($this->tmpFile);
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if ($maxSize == 0) {
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return null;
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}
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if ($length > $maxSize) {
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$length = $maxSize;
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}
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return fread($this->tmpFile, $length);
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} else {
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$contents = '';
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$blockSize = File_Archive::getOption('blockSize');
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while (!feof($this->tmpFile)) {
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$contents .= fread($this->tmpFile, $blockSize);
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}
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return $contents == '' ? null : $contents;
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}
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}
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}
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/**
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* @see File_Archive_Reader::skip()
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*/
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function skip($length = -1)
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{
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if ($this->fromSource) {
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return strlen($this->getData($length));
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} else {
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if ($length >= 0 && $this->pos+1 < count($this->files)) {
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$maxSize = $this->files[$this->pos+1]['pos'] - ftell($this->tmpFile);
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if ($maxSize == 0) {
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return null;
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}
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if ($length > $maxSize) {
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$length = $maxSize;
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}
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fseek($this->tmpFile, $length, SEEK_CUR);
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return $length;
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} else {
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$before = ftell($this->tmpFile);
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fseek($this->tmpFile, 0, SEEK_SET);
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$after = fteel($this->tmpFile);
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return $after - $before;
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}
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}
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}
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/**
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* @see File_Archive_Reader::rewind()
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*/
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function rewind($length = -1)
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{
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if ($this->fromSource) {
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$this->_writeEndOfFile();
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$this->fromSource = false;
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}
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$before = ftell($this->tmpFile);
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$pos = $this->files[$this->pos]['pos'];
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fseek($this->tmpFile, $pos, SEEK_SET);
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return $pos - $before;
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}
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/**
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* @see File_Archive_Reader::tell()
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*/
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function tell()
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{
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return ftell($this->tmpFile) - $this->files[$this->pos]['pos'];
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}
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/**
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* @see File_Archive_Reader::close()
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*/
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function close()
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{
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$this->fromSource = false;
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$this->pos = 0;
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fseek($this->tmpFile, 0, SEEK_SET);
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}
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function _closeAndReset()
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{
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$this->close();
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fclose($this->tmpFile);
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$this->tmpFile = tmpfile();
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$this->endOfSource = false;
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$this->files = array();
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$this->source->close();
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}
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/**
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* @see File_Archive_Reader::makeAppendWriter()
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*/
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function makeAppendWriter()
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{
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$writer = $this->source->makeAppendWriter();
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if (!PEAR::isError($writer)) {
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$this->_closeAndReset();
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}
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return $writer;
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}
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/**
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* @see File_Archive_Reader::makeWriterRemoveFiles()
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*/
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function makeWriterRemoveFiles($pred)
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{
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$writer = $this->source->makeWriterRemoveFiles($pred);
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if (!PEAR::isError($writer)) {
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$this->_closeAndReset();
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}
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return $writer;
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}
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/**
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* @see File_Archive_Reader::makeWriterRemoveBlocks()
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*/
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function makeWriterRemoveBlocks($blocks, $seek = 0)
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{
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$writer = $this->source->makeWriterRemoveBlocks($blocks, $seek);
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if (!PEAR::isError($writer)) {
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$this->_closeAndReset();
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}
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return $writer;
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}
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}
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?>
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