127 lines
3.2 KiB
PHP
127 lines
3.2 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @package Zend_Pdf
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* @subpackage FileParser
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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/** Zend_Pdf_FileParserDataSource */
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require_once 'Zend/Pdf/FileParserDataSource.php';
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/**
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* Concrete subclass of {@link Zend_Pdf_FileParserDataSource} that provides an
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* interface to binary strings.
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*
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* @package Zend_Pdf
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* @subpackage FileParser
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Pdf_FileParserDataSource_String extends Zend_Pdf_FileParserDataSource
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{
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/**** Instance Variables ****/
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/**
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* The string to parse.
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* @var string
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*/
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protected $_string = '';
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/**** Public Interface ****/
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/* Concrete Class Implementation */
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/**
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* Object constructor.
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*
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* Verifies that the string is not empty.
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*
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* @param string $string String to parse.
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*/
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public function __construct($string)
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{
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if (empty($string)) {
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throw new Zend_Pdf_Exception('String is empty',
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Zend_Pdf_Exception::PARAMETER_VALUE_OUT_OF_RANGE);
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}
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$this->_size = strlen($string);
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$this->_string = $string;
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}
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/**
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* Object destructor.
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*/
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public function __destruct()
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{
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$this->_string = '';
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}
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/**
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* Returns the specified number of raw bytes from the string at the byte
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* offset of the current read position.
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*
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* Advances the read position by the number of bytes read.
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*
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* Throws an exception if there is insufficient data to completely fulfill
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* the request.
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*
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* @param integer $byteCount Number of bytes to read.
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* @return string
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* @throws Zend_Pdf_Exception
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*/
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public function readBytes($byteCount)
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{
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if (($this->_offset + $byteCount) > $this->_size) {
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throw new Zend_Pdf_Exception("Insufficient data to read $byteCount bytes",
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Zend_Pdf_Exception::INSUFFICIENT_DATA);
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}
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$bytes = substr($this->_string, $this->_offset, $byteCount);
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$this->_offset += $byteCount;
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return $bytes;
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}
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/**
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* Returns the entire string.
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*
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* Preserves the current read position.
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*
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* @return string
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*/
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public function readAllBytes()
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{
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return $this->_string;
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}
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/* Object Magic Methods */
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/**
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* Returns a string containing the parsed string's length.
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*
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* @return string
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*/
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public function __toString()
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{
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return "String ($this->_size bytes)";
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}
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}
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