TCPDF_PARSER::decodeStream() - Code Metrics - Inspection of "Merge pull request #1192 from SeLite/master" - thorsten/phpMyFAQ - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 97f4cc...894ced )

by Thorsten

created 2016-06-30 04:15 UTC

TCPDF_PARSER::decodeStream() C

↳ Parent: TCPDF_PARSER

Complexity

Conditions	15
Paths	30

Size

Total Lines	42
Code Lines	25

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	15
eloc	25
nc	30
nop	2
dl	0
loc	42
rs	5.0504
c	0
b	0
f	0

How to fix Complexity

<?php
//============================================================+
// File name   : tcpdf_parser.php
// Version     : 1.0.000
// Begin       : 2011-05-23
// Last Update : 2011-07-14
// Author      : Nicola Asuni - Tecnick.com S.r.l - Via Della Pace, 11 - 09044 - Quartucciu (CA) - ITALY - www.tecnick.com - [email protected]
// License     : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3 + YOU CAN'T REMOVE ANY TCPDF COPYRIGHT NOTICE OR LINK FROM THE GENERATED PDF DOCUMENTS.
// -------------------------------------------------------------------
// Copyright (C) 2011-2011  Nicola Asuni - Tecnick.com S.r.l.
//
// This file is part of TCPDF software library.
//
// TCPDF is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version. Additionally,
// YOU CAN'T REMOVE ANY TCPDF COPYRIGHT NOTICE OR LINK FROM THE
// GENERATED PDF DOCUMENTS.
//
// TCPDF is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the License
// along with TCPDF. If not, see
// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
//
// See LICENSE.TXT file for more information.
// -------------------------------------------------------------------
//
// Description : This is a PHP class for parsing PDF documents.
//
//============================================================+

/**
 * @file
 * This is a PHP class for parsing PDF documents.<br>
 * @package com.tecnick.tcpdf
 * @author Nicola Asuni
 * @version 1.0.000
 */

// include class for decoding filters
require_once(dirname(__FILE__).'/tcpdf_filters.php');

/**
 * @class TCPDF_PARSER
 * This is a PHP class for parsing PDF documents.<br>
 * @package com.tecnick.tcpdf
 * @brief This is a PHP class for parsing PDF documents..
 * @version 1.0.000
 * @author Nicola Asuni - [email protected]
 */
class TCPDF_PARSER {

	/**
	 * Raw content of the PDF document.
	 * @private
	 */
	private $pdfdata = '';

	/**
	 * XREF data.
	 * @protected
	 */
	protected $xref = array();

	/**
	 * Array of PDF objects.
	 * @protected
	 */
	protected $objects = array();

	/**
	 * Class object for decoding filters.
	 * @private
	 */
	private $FilterDecoders;

// -----------------------------------------------------------------------------

	/**
	 * Parse a PDF document an return an array of objects.
	 * @param $data (string) PDF data to parse.
	 * @public
	 * @since 1.0.000 (2011-05-24)
	 */
	public function __construct($data) {
		if (empty($data)) {
			$this->Error('Empty PDF data.');
		}
		$this->pdfdata = $data;
		// get length
		$pdflen = strlen($this->pdfdata);
		// initialize class for decoding filters
		$this->FilterDecoders = new TCPDF_FILTERS();
		// get xref and trailer data
		$this->xref = $this->getXrefData();
		// parse all document objects
		$this->objects = array();
		foreach ($this->xref['xref'] as $obj => $offset) {
			if (!isset($this->objects[$obj])) {
				$this->objects[$obj] = $this->getIndirectObject($obj, $offset, true);
			}
		}
		// release some memory
		unset($this->pdfdata);
		$this->pdfdata = '';
	}

	/**
	 * Return an array of parsed PDF document objects.
	 * @return (array) Array of parsed PDF document objects.
	 * @public
	 * @since 1.0.000 (2011-06-26)
	 */
	public function getParsedData() {
		return array($this->xref, $this->objects);
	}

	/**
	 * Get xref (cross-reference table) and trailer data from PDF document data.
	 * @param $offset (int) xref offset (if know).
	 * @param $xref (array) previous xref array (if any).
	 * @return Array containing xref and trailer data.
	 * @protected
	 * @since 1.0.000 (2011-05-24)
	 */
	protected function getXrefData($offset=0, $xref=array()) {
		// find last startxref
		if (preg_match_all('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_SET_ORDER, $offset) == 0) {
			$this->Error('Unable to find startxref');
		}
		$matches = array_pop($matches);
		$startxref = $matches[1];
		// check xref position
		if (strpos($this->pdfdata, 'xref', $startxref) != $startxref) {
			$this->Error('Unable to find xref');
		}
		// extract xref data (object indexes and offsets)
		$offset = $startxref + 5;
		// initialize object number
		$obj_num = 0;
		while (preg_match('/^([0-9]+)[\s]([0-9]+)[\s]?([nf]?)/im', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
			$offset = (strlen($matches[0][0]) + $matches[0][1]);
			if ($matches[3][0] == 'n') {
				// create unique object index: [object number]_[generation number]
				$index = $obj_num.'_'.intval($matches[2][0]);
				// check if object already exist
				if (!isset($xref['xref'][$index])) {
					// store object offset position
					$xref['xref'][$index] = intval($matches[1][0]);
				}
				++$obj_num;
				$offset += 2;
			} elseif ($matches[3][0] == 'f') {
				++$obj_num;
				$offset += 2;
			} else {
				// object number (index)
				$obj_num = intval($matches[1][0]);
			}
		}
		// get trailer data
		if (preg_match('/trailer[\s]*<<(.*)>>[\s]*[\r\n]+startxref[\s]*[\r\n]+/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
			$trailer_data = $matches[1][0];
			if (!isset($xref['trailer'])) {
				// get only the last updated version
				$xref['trailer'] = array();
				// parse trailer_data
				if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
					$xref['trailer']['size'] = intval($matches[1]);
				}
				if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
					$xref['trailer']['root'] = intval($matches[1]).'_'.intval($matches[2]);
				}
				if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
					$xref['trailer']['encrypt'] = intval($matches[1]).'_'.intval($matches[2]);
				}
				if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
					$xref['trailer']['info'] = intval($matches[1]).'_'.intval($matches[2]);
				}
				if (preg_match('/ID[\s]*[\[][\s]*[<]([^>]*)[>][\s]*[<]([^>]*)[>]/i', $trailer_data, $matches) > 0) {
					$xref['trailer']['id'] = array();
					$xref['trailer']['id'][0] = $matches[1];
					$xref['trailer']['id'][1] = $matches[2];
				}
			}
			if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
				// get previous xref
				$xref = getXrefData(substr($this->pdfdata, 0, $startxref), intval($matches[1]), $xref);
			}
		} else {
			$this->Error('Unable to find trailer');
		}
		return $xref;
	}

	/**
	 * Get object type, raw value and offset to next object
	 * @param $offset (int) Object offset.
	 * @return array containing object type, raw value and offset to next object
	 * @protected
	 * @since 1.0.000 (2011-06-20)
	 */
	protected function getRawObject($offset=0) {
		$objtype = ''; // object type to be returned
		$objval = ''; // object value to be returned
		// skip initial white space chars: \x00 null (NUL), \x09 horizontal tab (HT), \x0A line feed (LF), \x0C form feed (FF), \x0D carriage return (CR), \x20 space (SP)
		$offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset);
		// get first char
		$char = $this->pdfdata{$offset};
		// get object type
		switch ($char) {
			case '%': { // \x25 PERCENT SIGN
				// skip comment and search for next token
				$next = strcspn($this->pdfdata, "\r\n", $offset);
				if ($next > 0) {
					$offset += $next;
					return $this->getRawObject($this->pdfdata, $offset);

				}
				break;
			}
			case '/': { // \x2F SOLIDUS
				// name object
				$objtype = $char;
				++$offset;
				if (preg_match('/^([^\x00\x09\x0a\x0c\x0d\x20\s\x28\x29\x3c\x3e\x5b\x5d\x7b\x7d\x2f\x25]+)/', substr($this->pdfdata, $offset, 256), $matches) == 1) {

					$objval = $matches[1]; // unescaped value
					$offset += strlen($objval);
				}
				break;
			}
			case '(':   // \x28 LEFT PARENTHESIS
			case ')': { // \x29 RIGHT PARENTHESIS
				// literal string object
				$objtype = $char;
				++$offset;
				$strpos = $offset;
				if ($char == '(') {
					$open_bracket = 1;
					while ($open_bracket > 0) {
						if (!isset($this->pdfdata{$strpos})) {
							break;
						}
						$ch = $this->pdfdata{$strpos};
						switch ($ch) {
							case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash)

								// skip next character
								++$strpos;
								break;
							}
							case '(': { // LEFT PARENHESIS (28h)
								++$open_bracket;
								break;
							}
							case ')': { // RIGHT PARENTHESIS (29h)
								--$open_bracket;
								break;
							}
						}
						++$strpos;
					}
					$objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1));
					$offset = $strpos;
				}
				break;
			}
			case '[':   // \x5B LEFT SQUARE BRACKET
			case ']': { // \x5D RIGHT SQUARE BRACKET
				// array object
				$objtype = $char;
				++$offset;
				if ($char == '[') {
					// get array content
					$objval = array();
					do {
						// get element
						$element = $this->getRawObject($offset);
						$offset = $element[2];
						$objval[] = $element;
					} while ($element[0] != ']');
					// remove closing delimiter
					array_pop($objval);
				}
				break;
			}
			case '<':   // \x3C LESS-THAN SIGN
			case '>': { // \x3E GREATER-THAN SIGN
				if (isset($this->pdfdata{($offset + 1)}) AND ($this->pdfdata{($offset + 1)} == $char)) {
					// dictionary object
					$objtype = $char.$char;
					$offset += 2;
					if ($char == '<') {
						// get array content
						$objval = array();
						do {
							// get element
							$element = $this->getRawObject($offset);
							$offset = $element[2];
							$objval[] = $element;
						} while ($element[0] != '>>');
						// remove closing delimiter
						array_pop($objval);
					}
				} else {
					// hexadecimal string object
					$objtype = $char;
					++$offset;
					if (($char == '<') AND (preg_match('/^([0-9A-Fa-f]+)[>]/iU', substr($this->pdfdata, $offset), $matches) == 1)) {

						$objval = $matches[1];
						$offset += strlen($matches[0]);
					}
				}
				break;
			}
			default: {
				if (substr($this->pdfdata, $offset, 6) == 'endobj') {
					// indirect object
					$objtype = 'endobj';
					$offset += 6;
				} elseif (substr($this->pdfdata, $offset, 4) == 'null') {
					// null object
					$objtype = 'null';
					$offset += 4;
					$objval = 'null';
				} elseif (substr($this->pdfdata, $offset, 4) == 'true') {
					// boolean true object
					$objtype = 'boolean';
					$offset += 4;
					$objval = 'true';
				} elseif (substr($this->pdfdata, $offset, 5) == 'false') {
					// boolean false object
					$objtype = 'boolean';
					$offset += 5;
					$objval = 'false';
				} elseif (substr($this->pdfdata, $offset, 6) == 'stream') {
					// start stream object
					$objtype = 'stream';
					$offset += 6;
					if (preg_match('/^[\r\n]+(.*)[\r\n]*endstream/isU', substr($this->pdfdata, $offset), $matches) == 1) {

						$objval = $matches[1];
						$offset += strlen($matches[0]);
					}
				} elseif (substr($this->pdfdata, $offset, 9) == 'endstream') {
					// end stream object
					$objtype = 'endstream';
					$offset += 9;
				} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
					// indirect object reference
					$objtype = 'ojbref';
					$offset += strlen($matches[0]);
					$objval = intval($matches[1]).'_'.intval($matches[2]);
				} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
					// object start
					$objtype = 'ojb';
					$objval = intval($matches[1]).'_'.intval($matches[2]);
					$offset += strlen ($matches[0]);
				} elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) {
					// numeric object
					$objtype = 'numeric';
					$objval = substr($this->pdfdata, $offset, $numlen);
					$offset += $numlen;
				}
				break;
			}
		}
		return array($objtype, $objval, $offset);
	}

	/**
	 * Get content of indirect object.
	 * @param $obj_ref (string) Object number and generation number separated by underscore character.
	 * @param $offset (int) Object offset.
	 * @param $decoding (boolean) If true decode streams.
	 * @return array containing object data.
	 * @protected
	 * @since 1.0.000 (2011-05-24)
	 */
	protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) {
		$obj = explode('_', $obj_ref);
		if (($obj === false) OR (count($obj) != 2)) {
			$this->Error('Invalid object reference: '.$obj);
			return;
		}
		$objref = $obj[0].' '.$obj[1].' obj';
		if (strpos($this->pdfdata, $objref, $offset) != $offset) {
			// an indirect reference to an undefined object shall be considered a reference to the null object
			return array('null', 'null', $offset);
		}
		// starting position of object content
		$offset += strlen($objref);
		// get array of object content
		$objdata = array();
		$i = 0; // object main index
		do {
			// get element
			$element = $this->getRawObject($offset);
			$offset = $element[2];
			// decode stream using stream's dictionary information
			if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) {
				$element[3] = $this->decodeStream($objdata[($i - 1)][1], $element[1]);
			}
			$objdata[$i] = $element;
			++$i;
		} while ($element[0] != 'endobj');
		// remove closing delimiter
		array_pop($objdata);
		// return raw object content
		return $objdata;
	}

	/**
	 * Get the content of object, resolving indect object reference if necessary.
	 * @param $obj (string) Object value.
	 * @return array containing object data.
	 * @protected
	 * @since 1.0.000 (2011-06-26)
	 */
	protected function getObjectVal($obj) {
		if ($obj[0] == 'objref') {
			// reference to indirect object
			if (isset($this->objects[$obj[1]])) {
				// this object has been already parsed
				return $this->objects[$obj[1]];
			} elseif (isset($this->xref[$obj[1]])) {
				// parse new object
				$this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false);
				return $this->objects[$obj[1]];
			}
		}
		return $obj;
	}

	/**
	 * Decode the specified stream.
	 * @param $sdic (array) Stream's dictionary array.
	 * @param $stream (string) Stream to decode.
	 * @return array containing decoded stream data and remaining filters.
	 * @protected
	 * @since 1.0.000 (2011-06-22)
	 */
	protected function decodeStream($sdic, $stream) {
		// get stream lenght and filters
		$slength = strlen($stream);
		$filters = array();
		foreach ($sdic as $k => $v) {
			if ($v[0] == '/') {
				if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) {
					// get declared stream lenght
					$declength = intval($sdic[($k + 1)][1]);
					if ($declength < $slength) {
						$stream = substr($stream, 0, $declength);
						$slength = $declength;
					}
				} elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) {
					// resolve indirect object
					$objval = $this->getObjectVal($sdic[($k + 1)]);
					if ($objval[0] == '/') {
						// single filter
						$filters[] = $objval[1];
					} elseif ($objval[0] == '[') {
						// array of filters
						foreach ($objval[1] as $flt) {
							if ($flt[0] == '/') {
								$filters[] = $flt[1];
							}
						}
					}
				}
			}
		}
		// decode the stream
		$remaining_filters = array();
		foreach ($filters as $filter) {
			if (in_array($filter, $this->FilterDecoders->getAvailableFilters())) {
				$stream = $this->FilterDecoders->decodeFilter($filter, $stream);
			} else {
				// add missing filter to array
				$remaining_filters[] = $filter;
			}
		}
		return array($stream, $remaining_filters);
	}

	/**
	 * This method is automatically called in case of fatal error; it simply outputs the message and halts the execution.
	 * @param $msg (string) The error message
	 * @public
	 * @since 1.0.000 (2011-05-23)
	 */
	public function Error($msg) {
		// exit program and print error
		die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
	}

} // END OF TCPDF_PARSER CLASS

//============================================================+
// END OF FILE
//============================================================+


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Push — master ( 97f4cc...894ced )

TCPDF_PARSER::decodeStream() C

Complexity

Size

Duplication

Importance

How to fix Complexity

Long Method

1		<?php
2		//============================================================+
3		// File name : tcpdf_parser.php
4		// Version : 1.0.000
5		// Begin : 2011-05-23
6		// Last Update : 2011-07-14
7		// Author : Nicola Asuni - Tecnick.com S.r.l - Via Della Pace, 11 - 09044 - Quartucciu (CA) - ITALY - www.tecnick.com - [email protected]
8		// License : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3 + YOU CAN'T REMOVE ANY TCPDF COPYRIGHT NOTICE OR LINK FROM THE GENERATED PDF DOCUMENTS.
9		// -------------------------------------------------------------------
10		// Copyright (C) 2011-2011 Nicola Asuni - Tecnick.com S.r.l.
11		//
12		// This file is part of TCPDF software library.
13		//
14		// TCPDF is free software: you can redistribute it and/or modify it
15		// under the terms of the GNU Lesser General Public License as
16		// published by the Free Software Foundation, either version 3 of the
17		// License, or (at your option) any later version. Additionally,
18		// YOU CAN'T REMOVE ANY TCPDF COPYRIGHT NOTICE OR LINK FROM THE
19		// GENERATED PDF DOCUMENTS.
20		//
21		// TCPDF is distributed in the hope that it will be useful, but
22		// WITHOUT ANY WARRANTY; without even the implied warranty of
23		// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
24		// See the GNU Lesser General Public License for more details.
25		//
26		// You should have received a copy of the License
27		// along with TCPDF. If not, see
28		// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
29		//
30		// See LICENSE.TXT file for more information.
31		// -------------------------------------------------------------------
32		//
33		// Description : This is a PHP class for parsing PDF documents.
34		//
35		//============================================================+
36
37		/**
38		* @file
39		* This is a PHP class for parsing PDF documents.<br>
40		* @package com.tecnick.tcpdf
41		* @author Nicola Asuni
42		* @version 1.0.000
43		*/
44
45		// include class for decoding filters
46		require_once(dirname(__FILE__).'/tcpdf_filters.php');
47
48		/**
49		* @class TCPDF_PARSER
50		* This is a PHP class for parsing PDF documents.<br>
51		* @package com.tecnick.tcpdf
52		* @brief This is a PHP class for parsing PDF documents..
53		* @version 1.0.000
54		* @author Nicola Asuni - [email protected]
55		*/
56		class TCPDF_PARSER {
57
58		/**
59		* Raw content of the PDF document.
60		* @private
61		*/
62		private $pdfdata = '';
63
64		/**
65		* XREF data.
66		* @protected
67		*/
68		protected $xref = array();
69
70		/**
71		* Array of PDF objects.
72		* @protected
73		*/
74		protected $objects = array();
75
76		/**
77		* Class object for decoding filters.
78		* @private
79		*/
80		private $FilterDecoders;
81
82		// -----------------------------------------------------------------------------
83
84		/**
85		* Parse a PDF document an return an array of objects.
86		* @param $data (string) PDF data to parse.
87		* @public
88		* @since 1.0.000 (2011-05-24)
89		*/
90		public function __construct($data) {
91		if (empty($data)) {
92		$this->Error('Empty PDF data.');
93		}
94		$this->pdfdata = $data;
95		// get length
96		$pdflen = strlen($this->pdfdata);
97		// initialize class for decoding filters
98		$this->FilterDecoders = new TCPDF_FILTERS();
99		// get xref and trailer data
100		$this->xref = $this->getXrefData();
101		// parse all document objects
102		$this->objects = array();
103		foreach ($this->xref['xref'] as $obj => $offset) {
104		if (!isset($this->objects[$obj])) {
105		$this->objects[$obj] = $this->getIndirectObject($obj, $offset, true);
106		}
107		}
108		// release some memory
109		unset($this->pdfdata);
110		$this->pdfdata = '';
111		}
112
113		/**
114		* Return an array of parsed PDF document objects.
115		* @return (array) Array of parsed PDF document objects.
116		* @public
117		* @since 1.0.000 (2011-06-26)
118		*/
119		public function getParsedData() {
120		return array($this->xref, $this->objects);
121		}
122
123		/**
124		* Get xref (cross-reference table) and trailer data from PDF document data.
125		* @param $offset (int) xref offset (if know).
126		* @param $xref (array) previous xref array (if any).
127		* @return Array containing xref and trailer data.
128		* @protected
129		* @since 1.0.000 (2011-05-24)
130		*/
131		protected function getXrefData($offset=0, $xref=array()) {
132		// find last startxref
133		if (preg_match_all('/[\r\n]startxref[\s][\r\n]+([0-9]+)[\s][\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_SET_ORDER, $offset) == 0) {
134		$this->Error('Unable to find startxref');
135		}
136		$matches = array_pop($matches);
137		$startxref = $matches[1];
138		// check xref position
139		if (strpos($this->pdfdata, 'xref', $startxref) != $startxref) {
140		$this->Error('Unable to find xref');
141		}
142		// extract xref data (object indexes and offsets)
143		$offset = $startxref + 5;
144		// initialize object number
145		$obj_num = 0;
146		while (preg_match('/^([0-9]+)[\s]([0-9]+)[\s]?([nf]?)/im', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
147		$offset = (strlen($matches[0][0]) + $matches[0][1]);
148		if ($matches[3][0] == 'n') {
149		// create unique object index: [object number]_[generation number]
150		$index = $obj_num.'_'.intval($matches[2][0]);
151		// check if object already exist
152		if (!isset($xref['xref'][$index])) {
153		// store object offset position
154		$xref['xref'][$index] = intval($matches[1][0]);
155		}
156		++$obj_num;
157		$offset += 2;
158		} elseif ($matches[3][0] == 'f') {
159		++$obj_num;
160		$offset += 2;
161		} else {
162		// object number (index)
163		$obj_num = intval($matches[1][0]);
164		}
165		}
166		// get trailer data
167		if (preg_match('/trailer[\s]<<(.)>>[\s][\r\n]+startxref[\s][\r\n]+/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
168		$trailer_data = $matches[1][0];
169		if (!isset($xref['trailer'])) {
170		// get only the last updated version
171		$xref['trailer'] = array();
172		// parse trailer_data
173		if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
174		$xref['trailer']['size'] = intval($matches[1]);
175		}
176	View Code Duplication	if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
177		$xref['trailer']['root'] = intval($matches[1]).'_'.intval($matches[2]);
178		}
179	View Code Duplication	if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
180		$xref['trailer']['encrypt'] = intval($matches[1]).'_'.intval($matches[2]);
181		}
182	View Code Duplication	if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
183		$xref['trailer']['info'] = intval($matches[1]).'_'.intval($matches[2]);
184		}
185		if (preg_match('/ID[\s][\[][\s][<]([^>])[>][\s][<]([^>]*)[>]/i', $trailer_data, $matches) > 0) {
186		$xref['trailer']['id'] = array();
187		$xref['trailer']['id'][0] = $matches[1];
188		$xref['trailer']['id'][1] = $matches[2];
189		}
190		}
191		if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
192		// get previous xref
193		$xref = getXrefData(substr($this->pdfdata, 0, $startxref), intval($matches[1]), $xref);
194		}
195		} else {
196		$this->Error('Unable to find trailer');
197		}
198		return $xref;
199		}
200
201		/**
202		* Get object type, raw value and offset to next object
203		* @param $offset (int) Object offset.
204		* @return array containing object type, raw value and offset to next object
205		* @protected
206		* @since 1.0.000 (2011-06-20)
207		*/
208		protected function getRawObject($offset=0) {
209		$objtype = ''; // object type to be returned
210		$objval = ''; // object value to be returned
211		// skip initial white space chars: \x00 null (NUL), \x09 horizontal tab (HT), \x0A line feed (LF), \x0C form feed (FF), \x0D carriage return (CR), \x20 space (SP)
212		$offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset);
213		// get first char
214		$char = $this->pdfdata{$offset};
215		// get object type
216		switch ($char) {
217		case '%': { // \x25 PERCENT SIGN
218		// skip comment and search for next token
219		$next = strcspn($this->pdfdata, "\r\n", $offset);
220		if ($next > 0) {
221		$offset += $next;
222		return $this->getRawObject($this->pdfdata, $offset);
		0 ignored issues – show Unused Code introduced 2016-04-27 15:38 UTC by Report Bug Copy Issue Report The call to `TCPDF_PARSER::getRawObject()` has too many arguments starting with `$offset`. This check compares calls to functions or methods with their respective definitions. If the call has more arguments than are defined, it raises an issue. If a function is defined several times with a different number of parameters, the check may pick up the wrong definition and report false positives. One codebase where this has been known to happen is Wordpress. In this case you can add the `@ignore` PhpDoc annotation to the duplicate definition and it will be ignored. Loading history...
223		}
224		break;
225		}
226		case '/': { // \x2F SOLIDUS
227		// name object
228		$objtype = $char;
229		++$offset;
230	View Code Duplication	if (preg_match('/^([^\x00\x09\x0a\x0c\x0d\x20\s\x28\x29\x3c\x3e\x5b\x5d\x7b\x7d\x2f\x25]+)/', substr($this->pdfdata, $offset, 256), $matches) == 1) {
		0 ignored issues – show Duplication introduced 2016-04-27 15:38 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
231		$objval = $matches[1]; // unescaped value
232		$offset += strlen($objval);
233		}
234		break;
235		}
236		case '(': // \x28 LEFT PARENTHESIS
237		case ')': { // \x29 RIGHT PARENTHESIS
238		// literal string object
239		$objtype = $char;
240		++$offset;
241		$strpos = $offset;
242		if ($char == '(') {
243		$open_bracket = 1;
244		while ($open_bracket > 0) {
245		if (!isset($this->pdfdata{$strpos})) {
246		break;
247		}
248		$ch = $this->pdfdata{$strpos};
249		switch ($ch) {
250		case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash)
		0 ignored issues – show Unused Code Comprehensibility introduced 2016-02-10 18:47 UTC by Report Bug Copy Issue Report `39%` of this comment could be valid code. Did you maybe forget this after debugging? Sometimes obsolete code just ends up commented out instead of removed. In this case it is better to remove the code once you have checked you do not need it. The code might also have been commented out for debugging purposes. In this case it is vital that someone uncomments it again or your project may behave in very unexpected ways in production. This check looks for comments that seem to be mostly valid code and reports them. Loading history...
251		// skip next character
252		++$strpos;
253		break;
254		}
255		case '(': { // LEFT PARENHESIS (28h)
256		++$open_bracket;
257		break;
258		}
259		case ')': { // RIGHT PARENTHESIS (29h)
260		--$open_bracket;
261		break;
262		}
263		}
264		++$strpos;
265		}
266		$objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1));
267		$offset = $strpos;
268		}
269		break;
270		}
271		case '[': // \x5B LEFT SQUARE BRACKET
272		case ']': { // \x5D RIGHT SQUARE BRACKET
273		// array object
274		$objtype = $char;
275		++$offset;
276	View Code Duplication	if ($char == '[') {
277		// get array content
278		$objval = array();
279		do {
280		// get element
281		$element = $this->getRawObject($offset);
282		$offset = $element[2];
283		$objval[] = $element;
284		} while ($element[0] != ']');
285		// remove closing delimiter
286		array_pop($objval);
287		}
288		break;
289		}
290		case '<': // \x3C LESS-THAN SIGN
291		case '>': { // \x3E GREATER-THAN SIGN
292		if (isset($this->pdfdata{($offset + 1)}) AND ($this->pdfdata{($offset + 1)} == $char)) {
293		// dictionary object
294		$objtype = $char.$char;
295		$offset += 2;
296	View Code Duplication	if ($char == '<') {
297		// get array content
298		$objval = array();
299		do {
300		// get element
301		$element = $this->getRawObject($offset);
302		$offset = $element[2];
303		$objval[] = $element;
304		} while ($element[0] != '>>');
305		// remove closing delimiter
306		array_pop($objval);
307		}
308		} else {
309		// hexadecimal string object
310		$objtype = $char;
311		++$offset;
312	View Code Duplication	if (($char == '<') AND (preg_match('/^([0-9A-Fa-f]+)[>]/iU', substr($this->pdfdata, $offset), $matches) == 1)) {
		0 ignored issues – show Duplication introduced 2016-04-27 15:38 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
313		$objval = $matches[1];
314		$offset += strlen($matches[0]);
315		}
316		}
317		break;
318		}
319		default: {
320		if (substr($this->pdfdata, $offset, 6) == 'endobj') {
321		// indirect object
322		$objtype = 'endobj';
323		$offset += 6;
324	View Code Duplication	} elseif (substr($this->pdfdata, $offset, 4) == 'null') {
325		// null object
326		$objtype = 'null';
327		$offset += 4;
328		$objval = 'null';
329		} elseif (substr($this->pdfdata, $offset, 4) == 'true') {
330		// boolean true object
331		$objtype = 'boolean';
332		$offset += 4;
333		$objval = 'true';
334	View Code Duplication	} elseif (substr($this->pdfdata, $offset, 5) == 'false') {
335		// boolean false object
336		$objtype = 'boolean';
337		$offset += 5;
338		$objval = 'false';
339		} elseif (substr($this->pdfdata, $offset, 6) == 'stream') {
340		// start stream object
341		$objtype = 'stream';
342		$offset += 6;
343	View Code Duplication	if (preg_match('/^[\r\n]+(.)[\r\n]endstream/isU', substr($this->pdfdata, $offset), $matches) == 1) {
		0 ignored issues – show Duplication introduced 2016-04-27 15:38 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
344		$objval = $matches[1];
345		$offset += strlen($matches[0]);
346		}
347		} elseif (substr($this->pdfdata, $offset, 9) == 'endstream') {
348		// end stream object
349		$objtype = 'endstream';
350		$offset += 9;
351		} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
352		// indirect object reference
353		$objtype = 'ojbref';
354		$offset += strlen($matches[0]);
355		$objval = intval($matches[1]).'_'.intval($matches[2]);
356		} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
357		// object start
358		$objtype = 'ojb';
359		$objval = intval($matches[1]).'_'.intval($matches[2]);
360		$offset += strlen ($matches[0]);
361		} elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) {
362		// numeric object
363		$objtype = 'numeric';
364		$objval = substr($this->pdfdata, $offset, $numlen);
365		$offset += $numlen;
366		}
367		break;
368		}
369		}
370		return array($objtype, $objval, $offset);
371		}
372
373		/**
374		* Get content of indirect object.
375		* @param $obj_ref (string) Object number and generation number separated by underscore character.
376		* @param $offset (int) Object offset.
377		* @param $decoding (boolean) If true decode streams.
378		* @return array containing object data.
379		* @protected
380		* @since 1.0.000 (2011-05-24)
381		*/
382		protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) {
383		$obj = explode('_', $obj_ref);
384		if (($obj === false) OR (count($obj) != 2)) {
385		$this->Error('Invalid object reference: '.$obj);
386		return;
387		}
388		$objref = $obj[0].' '.$obj[1].' obj';
389		if (strpos($this->pdfdata, $objref, $offset) != $offset) {
390		// an indirect reference to an undefined object shall be considered a reference to the null object
391		return array('null', 'null', $offset);
392		}
393		// starting position of object content
394		$offset += strlen($objref);
395		// get array of object content
396		$objdata = array();
397		$i = 0; // object main index
398		do {
399		// get element
400		$element = $this->getRawObject($offset);
401		$offset = $element[2];
402		// decode stream using stream's dictionary information
403		if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) {
404		$element[3] = $this->decodeStream($objdata[($i - 1)][1], $element[1]);
405		}
406		$objdata[$i] = $element;
407		++$i;
408		} while ($element[0] != 'endobj');
409		// remove closing delimiter
410		array_pop($objdata);
411		// return raw object content
412		return $objdata;
413		}
414
415		/**
416		* Get the content of object, resolving indect object reference if necessary.
417		* @param $obj (string) Object value.
418		* @return array containing object data.
419		* @protected
420		* @since 1.0.000 (2011-06-26)
421		*/
422		protected function getObjectVal($obj) {
423		if ($obj[0] == 'objref') {
424		// reference to indirect object
425		if (isset($this->objects[$obj[1]])) {
426		// this object has been already parsed
427		return $this->objects[$obj[1]];
428		} elseif (isset($this->xref[$obj[1]])) {
429		// parse new object
430		$this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false);
431		return $this->objects[$obj[1]];
432		}
433		}
434		return $obj;
435		}
436
437		/**
438		* Decode the specified stream.
439		* @param $sdic (array) Stream's dictionary array.
440		* @param $stream (string) Stream to decode.
441		* @return array containing decoded stream data and remaining filters.
442		* @protected
443		* @since 1.0.000 (2011-06-22)
444		*/
445		protected function decodeStream($sdic, $stream) {
446		// get stream lenght and filters
447		$slength = strlen($stream);
448		$filters = array();
449		foreach ($sdic as $k => $v) {
450		if ($v[0] == '/') {
451		if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) {
452		// get declared stream lenght
453		$declength = intval($sdic[($k + 1)][1]);
454		if ($declength < $slength) {
455		$stream = substr($stream, 0, $declength);
456		$slength = $declength;
457		}
458		} elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) {
459		// resolve indirect object
460		$objval = $this->getObjectVal($sdic[($k + 1)]);
461		if ($objval[0] == '/') {
462		// single filter
463		$filters[] = $objval[1];
464		} elseif ($objval[0] == '[') {
465		// array of filters
466		foreach ($objval[1] as $flt) {
467		if ($flt[0] == '/') {
468		$filters[] = $flt[1];
469		}
470		}
471		}
472		}
473		}
474		}
475		// decode the stream
476		$remaining_filters = array();
477		foreach ($filters as $filter) {
478		if (in_array($filter, $this->FilterDecoders->getAvailableFilters())) {
479		$stream = $this->FilterDecoders->decodeFilter($filter, $stream);
480		} else {
481		// add missing filter to array
482		$remaining_filters[] = $filter;
483		}
484		}
485		return array($stream, $remaining_filters);
486		}
487
488		/**
489		* This method is automatically called in case of fatal error; it simply outputs the message and halts the execution.
490		* @param $msg (string) The error message
491		* @public
492		* @since 1.0.000 (2011-05-23)
493		*/
494		public function Error($msg) {
495		// exit program and print error
496		die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
497		}
498
499		} // END OF TCPDF_PARSER CLASS
500
501		//============================================================+
502		// END OF FILE
503		//============================================================+
504

thorsten / phpMyFAQ

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TCPDF_PARSER::decodeStream() C

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Duplication

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