254 Zeilen
7,1 KiB
PHP
254 Zeilen
7,1 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Uncompress a file that was compressed in the Bzip2 format
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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: $Id$
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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/Archive.php";
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require_once "File/Archive/Writer/Files.php";
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/**
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* Uncompress a file that was compressed in the Bzip2 format
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*/
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class File_Archive_Reader_Bzip2 extends File_Archive_Reader_Archive
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{
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var $nbRead = 0;
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var $bzfile = null;
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var $tmpName = null;
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var $filePos = 0;
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/**
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* @see File_Archive_Reader::close()
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*/
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function close($innerClose = true)
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{
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if ($this->bzfile !== null)
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bzclose($this->bzfile);
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if ($this->tmpName !== null)
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unlink($this->tmpName);
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$this->bzfile = null;
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$this->tmpName = null;
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$this->nbRead = 0;
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$this->filePos = 0;
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return parent::close($innerClose);
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}
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/**
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* @see File_Archive_Reader::next()
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*/
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function next()
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{
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if (!parent::next()) {
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return false;
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}
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$this->nbRead++;
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if ($this->nbRead > 1) {
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return false;
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}
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$dataFilename = $this->source->getDataFilename();
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if ($dataFilename !== null)
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{
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$this->tmpName = null;
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$this->bzfile = @bzopen($dataFilename, 'r');
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if ($this->bzfile === false) {
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return PEAR::raiseError("bzopen failed to open $dataFilename");
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}
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} else {
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$this->tmpName = tempnam(File_Archive::getOption('tmpDirectory'), 'far');
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//Generate the tmp data
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$dest = new File_Archive_Writer_Files();
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$dest->newFile($this->tmpName);
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$this->source->sendData($dest);
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$dest->close();
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$this->bzfile = bzopen($this->tmpName, 'r');
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}
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return true;
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}
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/**
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* Return the name of the single file contained in the archive
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* deduced from the name of the archive (the extension is removed)
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*
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* @see File_Archive_Reader::getFilename()
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*/
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function getFilename()
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{
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$name = $this->source->getFilename();
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$pos = strrpos($name, ".");
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if ($pos === false || $pos === 0) {
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return $name;
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} else {
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return substr($name, 0, $pos);
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}
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}
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/**
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* @see File_Archive_Reader::getData()
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*/
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function getData($length = -1)
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{
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if ($length == -1) {
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$data = '';
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do {
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$newData = bzread($this->bzfile);
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$data .= $newData;
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} while ($newData != '');
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$this->filePos += strlen($data);
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} else if ($length == 0) {
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return '';
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} else {
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$data = '';
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//The loop is here to correct what appears to be a bzread bug
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while (strlen($data) < $length) {
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$newData = bzread($this->bzfile, $length - strlen($data));
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if ($newData == '') {
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break;
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}
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$data .= $newData;
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}
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$this->filePos += strlen($data);
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}
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return $data == '' ? null : $data;
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}
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/**
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* @see File_Archive_Reader::rewind
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*/
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function rewind($length = -1)
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{
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$before = $this->filePos;
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bzclose($this->bzfile);
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if ($this->tmpName === null) {
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$this->bzfile = bzopen($this->source->getDataFilename(), 'r');
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} else {
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$this->bzfile = bzopen($this->tmpName, 'r');
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}
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$this->filePos = 0;
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if ($length != -1) {
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$this->skip($before - $length);
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}
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return $before - $this->filePos;
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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 $this->filePos;
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}
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/**
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* @see File_Archive_Reader::makeAppendWriter()
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*/
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function makeAppendWriter()
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{
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return PEAR::raiseError('Unable to append files to a bzip2 archive');
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}
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/**
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* @see File_Archive_Reader::makeWriterRemoveFiles()
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*/
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function makeWriterRemoveFiles($pred)
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{
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return PEAR::raiseError('Unable to remove files from a bzip2 archive');
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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, $seek = 0)
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{
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require_once "File/Archive/Writer/Bzip2.php";
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if ($this->nbRead == 0) {
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return PEAR::raiseError('No file selected');
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}
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//Uncompress data to a temporary file
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$tmp = tmpfile();
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$expectedPos = $this->filePos + $seek;
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$this->rewind();
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//Read the begining of the file
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while ($this->filePos < $expectedPos &&
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($data = $this->getData(min($expectedPos - $this->filePos, 8192))) !== null) {
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fwrite($tmp, $data);
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}
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$keep = false;
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foreach ($blocks as $length) {
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if ($keep) {
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$expectedPos = $this->filePos + $length;
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while ($this->filePos < $expectedPos &&
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($data = $this->getData(min($expectedPos - $this->filePos, 8192))) !== null) {
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fwrite($tmp, $data);
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}
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} else {
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$this->skip($length);
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}
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$keep = !$keep;
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}
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if ($keep) {
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//Read the end of the file
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while(($data = $this->getData(8192)) !== null) {
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fwrite($tmp, $data);
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}
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}
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fseek($tmp, 0);
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//Create the writer
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$this->source->rewind();
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$innerWriter = $this->source->makeWriterRemoveBlocks(array()); //Truncate the source
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unset($this->source);
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$writer = new File_Archive_Writer_Bzip2(null, $innerWriter);
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//And compress data from the temporary file
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while (!feof($tmp)) {
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$data = fread($tmp, 8192);
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$writer->writeData($data);
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}
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fclose($tmp);
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//Do not close inner writer since makeWriter was called
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$this->close();
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return $writer;
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}
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}
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?>
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