stringparser.php

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<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [e-mail] so we can send you a copy immediately.
 *
 * @package    Zend_Pdf
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/** Zend_Pdf_Element */
require_once 'Zend/Pdf/Element.php';

/** Zend_Pdf_Element_Array */
require_once 'Zend/Pdf/Element/Array.php';

/** Zend_Pdf_Element_String_Binary */
require_once 'Zend/Pdf/Element/String/Binary.php';

/** Zend_Pdf_Element_Boolean */
require_once 'Zend/Pdf/Element/Boolean.php';

/** Zend_Pdf_Element_Dictionary */
require_once 'Zend/Pdf/Element/Dictionary.php';

/** Zend_Pdf_Element_Name */
require_once 'Zend/Pdf/Element/Name.php';

/** Zend_Pdf_Element_Numeric */
require_once 'Zend/Pdf/Element/Numeric.php';

/** Zend_Pdf_Element_Object */
require_once 'Zend/Pdf/Element/Object.php';

/** Zend_Pdf_Element_Reference */
require_once 'Zend/Pdf/Element/Reference.php';

/** Zend_Pdf_Element_Object_Stream */
require_once 'Zend/Pdf/Element/Object/Stream.php';

/** Zend_Pdf_Element_String */
require_once 'Zend/Pdf/Element/String.php';

/** Zend_Pdf_Element_Null */
require_once 'Zend/Pdf/Element/Null.php';

/** Zend_Pdf_Element_Reference_Context */
require_once 'Zend/Pdf/Element/Reference/Context.php';

/** Zend_Pdf_Element_Reference_Table */
require_once 'Zend/Pdf/Element/Reference/Table.php';

/** Zend_Pdf_ElementFactory_Interface */
require_once 'Zend/Pdf/ElementFactory/Interface.php';

/** Zend_Pdf_PhpArray */
require_once 'Zend/Pdf/PhpArray.php';


/**
 * PDF string parser
 *
 * @package    Zend_Pdf
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Pdf_StringParser
{
    /**
     * Source PDF
     *
     * @var string
     */
    public $data = '';

    /**
     * Current position in a data
     *
     * @var integer
     */
    public $offset = 0;

    /**
     * Current reference context
     *
     * @var Zend_Pdf_Element_Reference_Context
     */
    private $_context = null;

    /**
     * Array of elements of the currently parsed object/trailer
     *
     * @var array
     */
    private $_elements = array();

    /**
     * PDF objects factory.
     *
     * @var Zend_Pdf_ElementFactory_Interface
     */
    private $_objFactory = null;


    /**
     * Clean up resources.
     *
     * Clear current state to remove cyclic object references
     */
    public function cleanUp()
    {
        $this->_context = null;
        $this->_elements = array();
        $this->_objFactory = null;
    }

    /**
     * Character with code $chCode is white space
     *
     * @param integer $chCode
     * @return boolean
     */
    public static function isWhiteSpace($chCode)
    {
        if ($chCode == 0x00 || // null character
            $chCode == 0x09 || // Tab
            $chCode == 0x0A || // Line feed
            $chCode == 0x0C || // Form Feed
            $chCode == 0x0D || // Carriage return
            $chCode == 0x20    // Space
           ) {
            return true;
        } else {
            return false;
        }
    }


    /**
     * Character with code $chCode is a delimiter character
     *
     * @param integer $chCode
     * @return boolean
     */
    public static function isDelimiter($chCode )
    {
        if ($chCode == 0x28 || // '('
            $chCode == 0x29 || // ')'
            $chCode == 0x3C || // '<'
            $chCode == 0x3E || // '>'
            $chCode == 0x5B || // '['
            $chCode == 0x5D || // ']'
            $chCode == 0x7B || // '{'
            $chCode == 0x7D || // '}'
            $chCode == 0x2F || // '/'
            $chCode == 0x25    // '%'
           ) {
            return true;
        } else {
            return false;
        }
    }


    /**
     * Skip white space
     *
     * @param boolean $skipComment
     */
    public function skipWhiteSpace($skipComment = true)
    {
        while ($this->offset < strlen($this->data)) {
            if (self::isWhiteSpace( ord($this->data[$this->offset]) )) {
                $this->offset++;
            } else if (ord($this->data[$this->offset]) == 0x25 && $skipComment) { // '%'
                $this->skipComment();
            } else {
                return;
            }
        }
    }


    /**
     * Skip comment
     */
    public function skipComment()
    {
        while ($this->offset < strlen($this->data))
        {
            if (ord($this->data[$this->offset]) != 0x0A || // Line feed
                ord($this->data[$this->offset]) != 0x0d    // Carriage return
               ) {
                $this->offset++;
            } else {
                return;
            }
        }
    }


    /**
     * Read comment line
     *
     * @return string
     */
    public function readComment()
    {
        $this->skipWhiteSpace(false);

        /** Check if it's a comment line */
        if ($this->data[$this->offset] != '%') {
            return '';
        }

        for ($start = $this->offset;
             $this->offset < strlen($this->data);
             $this->offset++) {
            if (ord($this->data[$this->offset]) == 0x0A || // Line feed
                ord($this->data[$this->offset]) == 0x0d    // Carriage return
               ) {
                break;
            }
        }

        return substr($this->data, $start, $this->offset-$start);
    }


    /**
     * Returns next lexeme from a pdf stream
     *
     * @return string
     */
    public function readLexeme()
    {
        $this->skipWhiteSpace();

        if ($this->offset >= strlen($this->data)) {
            return '';
        }

        $start = $this->offset;

        if (self::isDelimiter( ord($this->data[$start]) )) {
            if ($this->data[$start] == '<' && $this->offset + 1 < strlen($this->data) && $this->data[$start+1] == '<') {
                $this->offset += 2;
                return '<<';
            } else if ($this->data[$start] == '>' && $this->offset + 1 < strlen($this->data) && $this->data[$start+1] == '>') {
                $this->offset += 2;
                return '>>';
            } else {
                $this->offset++;
                return $this->data[$start];
            }
        } else {
            while ( ($this->offset < strlen($this->data)) &&
                    (!self::isDelimiter(  ord($this->data[$this->offset]) )) &&
                    (!self::isWhiteSpace( ord($this->data[$this->offset]) ))   ) {
                $this->offset++;
            }

            return substr($this->data, $start, $this->offset - $start);
        }
    }


    /**
     * Read elemental object from a PDF stream
     *
     * @return Zend_Pdf_Element
     * @throws Zend_Pdf_Exception
     */
    public function readElement($nextLexeme = null)
    {
        if ($nextLexeme === null) {
            $nextLexeme = $this->readLexeme();
        }

        /**
         * Note: readElement() method is a public method and could be invoked from other classes.
         * If readElement() is used not by Zend_Pdf_StringParser::getObject() method, then we should not care
         * about _elements member management.
         */
        switch ($nextLexeme) {
            case '(':
                return ($this->_elements[] = $this->_readString());

            case '<':
                return ($this->_elements[] = $this->_readBinaryString());

            case '/':
                return ($this->_elements[] = new Zend_Pdf_Element_Name(
                                                Zend_Pdf_Element_Name::unescape( $this->readLexeme() )
                                                                      ));

            case '[':
                return ($this->_elements[] = $this->_readArray());

            case '<<':
                return ($this->_elements[] = $this->_readDictionary());

            case ')':
                // fall through to next case
            case '>':
                // fall through to next case
            case ']':
                // fall through to next case
            case '>>':
                // fall through to next case
            case '{':
                // fall through to next case
            case '}':
                throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X.',
                                                $this->offset));

            default:
                if (strcasecmp($nextLexeme, 'true') == 0) {
                    return ($this->_elements[] = new Zend_Pdf_Element_Boolean(true));
                } else if (strcasecmp($nextLexeme, 'false') == 0) {
                    return ($this->_elements[] = new Zend_Pdf_Element_Boolean(false));
                } else if (strcasecmp($nextLexeme, 'null') == 0) {
                    return ($this->_elements[] = new Zend_Pdf_Element_Null());
                }

                $ref = $this->_readReference($nextLexeme);
                if ($ref !== null) {
                    return ($this->_elements[] = $ref);
                }

                return ($this->_elements[] = $this->_readNumeric($nextLexeme));
        }
    }


    /**
     * Read string PDF object
     * Also reads trailing ')' from a pdf stream
     *
     * @return Zend_Pdf_Element_String
     * @throws Zend_Pdf_Exception
     */
    private function _readString()
    {
        $start = $this->offset;