--- /dev/null
+<?php
+//============================================================+
+// File name : tcpdf_parser.php
+// Version : 1.0.014
+// Begin : 2011-05-23
+// Last Update : 2014-02-18
+// Author : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
+// License : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3
+// -------------------------------------------------------------------
+// Copyright (C) 2011-2014 Nicola Asuni - Tecnick.com LTD
+//
+// 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.
+//
+// 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 1.0.014
+ */
+
+// include class for decoding filters
+require_once(dirname(__FILE__).'/include/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 1.0.010
+ * @author Nicola Asuni - info@tecnick.com
+ */
+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;
+
+ /**
+ * Array of configuration parameters.
+ * @private
+ */
+ private $cfg = array(
+ 'die_for_errors' => false,
+ 'ignore_filter_decoding_errors' => true,
+ 'ignore_missing_filter_decoders' => true,
+ );
+
+// -----------------------------------------------------------------------------
+
+ /**
+ * Parse a PDF document an return an array of objects.
+ * @param $data (string) PDF data to parse.
+ * @param $cfg (array) Array of configuration parameters:
+ * 'die_for_errors' : if true termitate the program execution in case of error, otherwise thows an exception;
+ * 'ignore_filter_decoding_errors' : if true ignore filter decoding errors;
+ * 'ignore_missing_filter_decoders' : if true ignore missing filter decoding errors.
+ * @public
+ * @since 1.0.000 (2011-05-24)
+ */
+ public function __construct($data, $cfg=array()) {
+ if (empty($data)) {
+ $this->Error('Empty PDF data.');
+ }
+ // find the pdf header starting position
+ if (($trimpos = strpos($data, '%PDF-')) === FALSE) {
+ $this->Error('Invalid PDF data: missing %PDF header.');
+ }
+ // get PDF content string
+ $this->pdfdata = substr($data, $trimpos);
+ // get length
+ $pdflen = strlen($this->pdfdata);
+ // set configuration parameters
+ $this->setConfig($cfg);
+ // 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[$obj]) AND ($offset > 0)) {
+ // decode objects with positive offset
+ $this->objects[$obj] = $this->getIndirectObject($obj, $offset, true);
+ }
+ }
+ // release some memory
+ unset($this->pdfdata);
+ $this->pdfdata = '';
+ }
+
+ /**
+ * Set the configuration parameters.
+ * @param $cfg (array) Array of configuration parameters:
+ * 'die_for_errors' : if true termitate the program execution in case of error, otherwise thows an exception;
+ * 'ignore_filter_decoding_errors' : if true ignore filter decoding errors;
+ * 'ignore_missing_filter_decoders' : if true ignore missing filter decoding errors.
+ * @public
+ */
+ protected function setConfig($cfg) {
+ if (isset($cfg['die_for_errors'])) {
+ $this->cfg['die_for_errors'] = !!$cfg['die_for_errors'];
+ }
+ if (isset($cfg['ignore_filter_decoding_errors'])) {
+ $this->cfg['ignore_filter_decoding_errors'] = !!$cfg['ignore_filter_decoding_errors'];
+ }
+ if (isset($cfg['ignore_missing_filter_decoders'])) {
+ $this->cfg['ignore_missing_filter_decoders'] = !!$cfg['ignore_missing_filter_decoders'];
+ }
+ }
+
+ /**
+ * 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 Cross-Reference (xref) 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, $xref=array()) {
+ if ($offset == 0) {
+ // 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 = $matches[1];
+ } elseif (strpos($this->pdfdata, 'xref', $offset) == $offset) {
+ // Already pointing at the xref table
+ $startxref = $offset;
+ } elseif (preg_match('/([0-9]+[\s][0-9]+[\s]obj)/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
+ // Cross-Reference Stream object
+ $startxref = $offset;
+ } elseif (preg_match('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
+ // startxref found
+ $startxref = $matches[1][0];
+ } else {
+ $this->Error('Unable to find startxref');
+ }
+ // check xref position
+ if (strpos($this->pdfdata, 'xref', $startxref) == $startxref) {
+ // Cross-Reference
+ $xref = $this->decodeXref($startxref, $xref);
+ } else {
+ // Cross-Reference Stream
+ $xref = $this->decodeXrefStream($startxref, $xref);
+ }
+ if (empty($xref)) {
+ $this->Error('Unable to find xref');
+ }
+ return $xref;
+ }
+
+ /**
+ * Decode the Cross-Reference section
+ * @param $startxref (int) Offset at which the xref section starts (position of the 'xref' keyword).
+ * @param $xref (array) Previous xref array (if any).
+ * @return Array containing xref and trailer data.
+ * @protected
+ * @since 1.0.000 (2011-06-20)
+ */
+ protected function decodeXref($startxref, $xref=array()) {
+ $startxref += 4; // 4 is the lenght of the word 'xref'
+ // 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 = $startxref + strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $startxref);
+ // initialize object number
+ $obj_num = 0;
+ // search for cross-reference entries or subsection
+ while (preg_match('/([0-9]+)[\x20]([0-9]+)[\x20]?([nf]?)(\r\n|[\x20]?[\r\n])/', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
+ if ($matches[0][1] != $offset) {
+ // we are on another section
+ break;
+ }
+ $offset += strlen($matches[0][0]);
+ 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;
+ } elseif ($matches[3][0] == 'f') {
+ ++$obj_num;
+ } else {
+ // object number (index)
+ $obj_num = intval($matches[1][0]);
+ }
+ }
+ // get trailer data
+ if (preg_match('/trailer[\s]*<<(.*)>>/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
+ $trailer_data = $matches[1][0];
+ if (!isset($xref['trailer']) OR empty($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 = $this->getXrefData(intval($matches[1]), $xref);
+ }
+ } else {
+ $this->Error('Unable to find trailer');
+ }
+ return $xref;
+ }
+
+ /**
+ * Decode the Cross-Reference Stream section
+ * @param $startxref (int) Offset at which the xref section starts.
+ * @param $xref (array) Previous xref array (if any).
+ * @return Array containing xref and trailer data.
+ * @protected
+ * @since 1.0.003 (2013-03-16)
+ */
+ protected function decodeXrefStream($startxref, $xref=array()) {
+ // try to read Cross-Reference Stream
+ $xrefobj = $this->getRawObject($startxref);
+ $xrefcrs = $this->getIndirectObject($xrefobj[1], $startxref, true);
+ if (!isset($xref['trailer']) OR empty($xref['trailer'])) {
+ // get only the last updated version
+ $xref['trailer'] = array();
+ $filltrailer = true;
+ } else {
+ $filltrailer = false;
+ }
+ if (!isset($xref['xref'])) {
+ $xref['xref'] = array();
+ }
+ $valid_crs = false;
+ $columns = 0;
+ $sarr = $xrefcrs[0][1];
+ foreach ($sarr as $k => $v) {
+ if (($v[0] == '/') AND ($v[1] == 'Type') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == '/') AND ($sarr[($k +1)][1] == 'XRef'))) {
+ $valid_crs = true;
+ } elseif (($v[0] == '/') AND ($v[1] == 'Index') AND (isset($sarr[($k +1)]))) {
+ // first object number in the subsection
+ $index_first = intval($sarr[($k +1)][1][0][1]);
+ // number of entries in the subsection
+ $index_entries = intval($sarr[($k +1)][1][1][1]);
+ } elseif (($v[0] == '/') AND ($v[1] == 'Prev') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
+ // get previous xref offset
+ $prevxref = intval($sarr[($k +1)][1]);
+ } elseif (($v[0] == '/') AND ($v[1] == 'W') AND (isset($sarr[($k +1)]))) {
+ // number of bytes (in the decoded stream) of the corresponding field
+ $wb = array();
+ $wb[0] = intval($sarr[($k +1)][1][0][1]);
+ $wb[1] = intval($sarr[($k +1)][1][1][1]);
+ $wb[2] = intval($sarr[($k +1)][1][2][1]);
+ } elseif (($v[0] == '/') AND ($v[1] == 'DecodeParms') AND (isset($sarr[($k +1)][1]))) {
+ $decpar = $sarr[($k +1)][1];
+ foreach ($decpar as $kdc => $vdc) {
+ if (($vdc[0] == '/') AND ($vdc[1] == 'Columns') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
+ $columns = intval($decpar[($kdc +1)][1]);
+ } elseif (($vdc[0] == '/') AND ($vdc[1] == 'Predictor') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
+ $predictor = intval($decpar[($kdc +1)][1]);
+ }
+ }
+ } elseif ($filltrailer) {
+ if (($v[0] == '/') AND ($v[1] == 'Size') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
+ $xref['trailer']['size'] = $sarr[($k +1)][1];
+ } elseif (($v[0] == '/') AND ($v[1] == 'Root') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
+ $xref['trailer']['root'] = $sarr[($k +1)][1];
+ } elseif (($v[0] == '/') AND ($v[1] == 'Info') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
+ $xref['trailer']['info'] = $sarr[($k +1)][1];
+ } elseif (($v[0] == '/') AND ($v[1] == 'Encrypt') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
+ $xref['trailer']['encrypt'] = $sarr[($k +1)][1];
+ } elseif (($v[0] == '/') AND ($v[1] == 'ID') AND (isset($sarr[($k +1)]))) {
+ $xref['trailer']['id'] = array();
+ $xref['trailer']['id'][0] = $sarr[($k +1)][1][0][1];
+ $xref['trailer']['id'][1] = $sarr[($k +1)][1][1][1];
+ }
+ }
+ }
+ // decode data
+ if ($valid_crs AND isset($xrefcrs[1][3][0])) {
+ // number of bytes in a row
+ $rowlen = ($columns + 1);
+ // convert the stream into an array of integers
+ $sdata = unpack('C*', $xrefcrs[1][3][0]);
+ // split the rows
+ $sdata = array_chunk($sdata, $rowlen);
+ // initialize decoded array
+ $ddata = array();
+ // initialize first row with zeros
+ $prev_row = array_fill (0, $rowlen, 0);
+ // for each row apply PNG unpredictor
+ foreach ($sdata as $k => $row) {
+ // initialize new row
+ $ddata[$k] = array();
+ // get PNG predictor value
+ $predictor = (10 + $row[0]);
+ // for each byte on the row
+ for ($i=1; $i<=$columns; ++$i) {
+ // new index
+ $j = ($i - 1);
+ $row_up = $prev_row[$j];
+ if ($i == 1) {
+ $row_left = 0;
+ $row_upleft = 0;
+ } else {
+ $row_left = $row[($i - 1)];
+ $row_upleft = $prev_row[($j - 1)];
+ }
+ switch ($predictor) {
+ case 10: { // PNG prediction (on encoding, PNG None on all rows)
+ $ddata[$k][$j] = $row[$i];
+ break;
+ }
+ case 11: { // PNG prediction (on encoding, PNG Sub on all rows)
+ $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
+ break;
+ }
+ case 12: { // PNG prediction (on encoding, PNG Up on all rows)
+ $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
+ break;
+ }
+ case 13: { // PNG prediction (on encoding, PNG Average on all rows)
+ $ddata[$k][$j] = (($row[$i] + (($row_left + $row_up) / 2)) & 0xff);
+ break;
+ }
+ case 14: { // PNG prediction (on encoding, PNG Paeth on all rows)
+ // initial estimate
+ $p = ($row_left + $row_up - $row_upleft);
+ // distances
+ $pa = abs($p - $row_left);
+ $pb = abs($p - $row_up);
+ $pc = abs($p - $row_upleft);
+ $pmin = min($pa, $pb, $pc);
+ // return minumum distance
+ switch ($pmin) {
+ case $pa: {
+ $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
+ break;
+ }
+ case $pb: {
+ $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
+ break;
+ }
+ case $pc: {
+ $ddata[$k][$j] = (($row[$i] + $row_upleft) & 0xff);
+ break;
+ }
+ }
+ break;
+ }
+ default: { // PNG prediction (on encoding, PNG optimum)
+ $this->Error('Unknown PNG predictor');
+ break;
+ }
+ }
+ }
+ $prev_row = $ddata[$k];
+ } // end for each row
+ // complete decoding
+ $sdata = array();
+ // for every row
+ foreach ($ddata as $k => $row) {
+ // initialize new row
+ $sdata[$k] = array(0, 0, 0);
+ if ($wb[0] == 0) {
+ // default type field
+ $sdata[$k][0] = 1;
+ }
+ $i = 0; // count bytes in the row
+ // for every column
+ for ($c = 0; $c < 3; ++$c) {
+ // for every byte on the column
+ for ($b = 0; $b < $wb[$c]; ++$b) {
+ if (isset($row[$i])) {
+ $sdata[$k][$c] += ($row[$i] << (($wb[$c] - 1 - $b) * 8));
+ }
+ ++$i;
+ }
+ }
+ }
+ $ddata = array();
+ // fill xref
+ if (isset($index_first)) {
+ $obj_num = $index_first;
+ } else {
+ $obj_num = 0;
+ }
+ foreach ($sdata as $k => $row) {
+ switch ($row[0]) {
+ case 0: { // (f) linked list of free objects
+ break;
+ }
+ case 1: { // (n) objects that are in use but are not compressed
+ // create unique object index: [object number]_[generation number]
+ $index = $obj_num.'_'.$row[2];
+ // check if object already exist
+ if (!isset($xref['xref'][$index])) {
+ // store object offset position
+ $xref['xref'][$index] = $row[1];
+ }
+ break;
+ }
+ case 2: { // compressed objects
+ // $row[1] = object number of the object stream in which this object is stored
+ // $row[2] = index of this object within the object stream
+ $index = $row[1].'_0_'.$row[2];
+ $xref['xref'][$index] = -1;
+ break;
+ }
+ default: { // null objects
+ break;
+ }
+ }
+ ++$obj_num;
+ }
+ } // end decoding data
+ if (isset($prevxref)) {
+ // get previous xref
+ $xref = $this->getXrefData($prevxref, $xref);
+ }
+ 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 $this->getRawObject($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 (($char == '<') AND (preg_match('/^([0-9A-Fa-f\x09\x0a\x0c\x0d\x20]+)>/iU', substr($this->pdfdata, $offset), $matches) == 1)) {
+ // remove white space characters
+ $objval = strtr($matches[1], "\x09\x0a\x0c\x0d\x20", '');
+ $offset += strlen($matches[0]);
+ } elseif (($endpos = strpos($this->pdfdata, '>', $offset)) !== FALSE) {
+ $offset = $endpos + 1;
+ }
+ }
+ break;
+ }
+ default: {
+ if (substr($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';
+ $offset += 6;
+ if (preg_match('/^([\r]?[\n])/isU', substr($this->pdfdata, $offset), $matches) == 1) {
+ $offset += strlen($matches[0]);
+ if (preg_match('/(endstream)[\x09\x0a\x0c\x0d\x20]/isU', substr($this->pdfdata, $offset), $matches, PREG_OFFSET_CAPTURE) == 1) {
+ $objval = substr($this->pdfdata, $offset, $matches[0][1]);
+ $offset += $matches[1][1];
+ }
+ }
+ } elseif (substr($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 = 'objref';
+ $offset += strlen($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 = 'obj';
+ $objval = intval($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';
+ // ignore leading zeros
+ $offset += strspn($this->pdfdata, '0', $offset);
+ if (strpos($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);
+ if ($slength <= 0) {
+ return array('', array());
+ }
+ $filters = array();
+ foreach ($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, TCPDF_FILTERS::getAvailableFilters())) {
+ try {
+ $stream = TCPDF_FILTERS::decodeFilter($filter, $stream);
+ } catch (Exception $e) {
+ $emsg = $e->getMessage();
+ if ((($emsg[0] == '~') AND !$this->cfg['ignore_missing_filter_decoders'])
+ OR (($emsg[0] != '~') AND !$this->cfg['ignore_filter_decoding_errors'])) {
+ $this->Error($e->getMessage());
+ }
+ }
+ } else {
+ // add missing filter to array
+ $remaining_filters[] = $filter;
+ }
+ }
+ return array($stream, $remaining_filters);
+ }
+
+ /**
+ * Throw an exception or print an error message and die if the K_TCPDF_PARSER_THROW_EXCEPTION_ERROR constant is set to true.
+ * @param $msg (string) The error message
+ * @public
+ * @since 1.0.000 (2011-05-23)
+ */
+ public function Error($msg) {
+ if ($this->cfg['die_for_errors']) {
+ die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
+ } else {
+ throw new Exception('TCPDF_PARSER ERROR: '.$msg);
+ }
+ }
+
+} // END OF TCPDF_PARSER CLASS
+
+//============================================================+
+// END OF FILE
+//============================================================+
projects / github / wallabag / wallabag.git / blobdiff