c6c10d7ce8
git-svn-id: http://php-reader.googlecode.com/svn/trunk@139 51a70ab9-7547-0410-9469-37e369ee0574
217 lines
7.4 KiB
PHP
217 lines
7.4 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2006-2009 The PHP Reader Project Workgroup. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the project workgroup nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package php-reader
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* @subpackage ASF
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* @copyright Copyright (c) 2006-2009 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once("Reader.php");
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require_once("ASF/Object/Container.php");
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/**#@-*/
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/**
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* This class represents a file in Advanced Systems Format (ASF) as described in
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* {@link http://go.microsoft.com/fwlink/?LinkId=31334 The Advanced Systems
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* Format (ASF) Specification}. It is a file format that can contain various
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* types of information ranging from audio and video to script commands and
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* developer defined custom streams.
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*
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* The ASF file consists of code blocks that are called content objects. Each
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* of these objects have a format of their own. They may contain other objects
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* or other specific data. Each supported object has been implemented as their
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* own classes to ease the correct use of the information.
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*
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* @package php-reader
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* @subpackage ASF
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @copyright Copyright (c) 2006-2009 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Rev$
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*/
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class ASF extends ASF_Object_Container
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{
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/** @var string */
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private $_filename;
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/**
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* Constructs the ASF class with given file and options.
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*
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* The following options are currently recognized:
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* o encoding -- Indicates the encoding that all the texts are presented
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* with. By default this is set to utf-8. See the documentation of iconv
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* for accepted values.
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* o readonly -- Indicates that the file is read from a temporary location
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* or another source it cannot be written back to.
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*
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* @param string $filename The path to the file or file descriptor of an
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* opened file.
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* @param Array $options The options array.
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*/
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public function __construct($filename, $options = array())
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{
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$this->_reader = new Reader($this->_filename = $filename);
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$this->setOptions($options);
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if ($this->getOption("encoding", false) === false)
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$this->setOption("encoding", "utf-8");
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$this->setOffset(0);
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$this->setSize($this->_reader->getSize());
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$this->constructObjects
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(array
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(self::HEADER => "Header",
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self::DATA => "Data",
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self::SIMPLE_INDEX => "SimpleIndex",
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self::INDEX => "Index",
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self::MEDIA_OBJECT_INDEX => "MediaObjectIndex",
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self::TIMECODE_INDEX => "TimecodeIndex"));
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}
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/**
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* Returns the mandatory header object contained in this file.
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*
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* @return ASF_Object_Header
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*/
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public function getHeader()
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{
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$header = $this->getObjectsByIdentifier(self::HEADER);
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return $header[0];
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}
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/**
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* Returns the mandatory data object contained in this file.
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*
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* @return ASF_Object_Data
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*/
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public function getData()
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{
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$data = $this->getObjectsByIdentifier(self::DATA);
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return $data[0];
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}
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/**
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* Returns an array of index objects contained in this file.
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*
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* @return Array
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*/
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public function getIndices()
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{
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return $this->getObjectsByIdentifier
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(self::SIMPLE_INDEX . "|" . self::INDEX . "|" .
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self::MEDIA_OBJECT_INDEX . "|" . self::TIMECODE_INDEX);
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}
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/**
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* Writes the changes back to the original media file.
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*/
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public function write($filename = false)
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{
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if ($filename === false)
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$filename = $this->_filename;
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if ($filename !== false && $this->_filename !== false &&
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realpath($filename) != realpath($this->_filename) &&
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!copy($this->_filename, $filename)) {
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require_once("ASF/Exception.php");
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throw new ASF_Exception("Unable to copy source to destination: " .
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realpath($this->_filename) . "->" . realpath($filename));
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}
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if (($fd = fopen
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($filename, file_exists($filename) ? "r+b" : "wb")) === false) {
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require_once("ASF/Exception.php");
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throw new ASF_Exception("Unable to open file for writing: " . $filename);
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}
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$header = $this->getHeader();
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$headerLengthOld = $header->getSize();
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$header->removeObjectsByIdentifier(ASF_Object::PADDING);
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$header->headerExtension->removeObjectsByIdentifier(ASF_Object::PADDING);
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$headerData = $header->__toString();
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$headerLengthNew = $header->getSize();
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// Fits right in
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if ($headerLengthOld == $headerLengthNew) {
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}
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// Fits with adjusted padding
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else if ($headerLengthOld >= $headerLengthNew + 24 /* for header */) {
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$header->headerExtension->padding->setSize
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($headerLengthOld - $headerLengthNew);
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$headerData = $header->__toString();
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$headerLengthNew = $header->getSize();
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}
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// Must expand
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else {
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$header->headerExtension->padding->setSize(4096);
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$headerData = $header->__toString();
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$headerLengthNew = $header->getSize();
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fseek($fd, 0, SEEK_END);
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$oldFileSize = ftell($fd);
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ftruncate
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($fd, $newFileSize = $headerLengthNew - $headerLengthOld +
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$oldFileSize);
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for ($i = 1, $cur = $oldFileSize; $cur > 0; $cur -= 1024, $i++) {
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fseek($fd, -(($i * 1024) + ($newFileSize - $oldFileSize)), SEEK_END);
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$buffer = fread($fd, 1024);
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fseek($fd, -($i * 1024), SEEK_END);
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fwrite($fd, $buffer, 1024);
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}
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}
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fseek($fd, 0);
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fwrite($fd, $headerData, $headerLengthNew);
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fclose($fd);
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$this->_filename = $filename;
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}
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/**
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* Returns the whether the object is required to be present, or whether
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* minimum cardinality is 1.
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*
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* @return boolean
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*/
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public function isMandatory() { return true; }
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/**
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* Returns whether multiple instances of this object can be present, or
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* whether maximum cardinality is greater than 1.
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*
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* @return boolean
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*/
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public function isMultiple() { return false; }
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}
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