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- <?php
- //============================================================+
- // File name : tcpdf_parser.php
- // Version : 1.0.16
- // Begin : 2011-05-23
- // Last Update : 2015-04-28
- // 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) 2011-2015 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 1.0.15
- */
-
- // 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 1.0.15
- * @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 length 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 = $xrefcrs[0][1];
- if (!is_array($sarr)) {
- $sarr = array();
- }
- foreach ($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, $pc);
- // return minimum distance
- switch ($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 {
- $oldoffset = $offset;
- // 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 (($element[0] != 'endobj') AND ($offset != $oldoffset));
- // remove closing delimiter
- array_pop($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 length 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 length
- $declength = intval($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
- //============================================================+
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