New file |
0,0 → 1,745 |
<?php |
//============================================================+ |
// File name : tcpdf_parser.php |
// Version : 1.0.003 |
// Begin : 2011-05-23 |
// Last Update : 2013-03-17 |
// Author : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com |
// License : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html) |
// ------------------------------------------------------------------- |
// Copyright (C) 2011-2013 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 1.0.003 |
*/ |
|
// 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 1.0.003 |
* @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; |
|
// ----------------------------------------------------------------------------- |
|
/** |
* 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[$obj]) AND ($offset > 0)) { |
// decode only objects with positive offset |
$this->objects[$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 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]; |
} else { |
if (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. |
* @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()) { |
// extract xref data (object indexes and offsets) |
$xoffset = $startxref + 5; |
// initialize object number |
$obj_num = 0; |
$offset = $xoffset; |
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, $xoffset) > 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; |
} |
$valid_crs = false; |
$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] == 'ojbref'))) { |
$xref['trailer']['root'] = $sarr[($k +1)][1]; |
} elseif (($v[0] == '/') AND ($v[1] == 'Info') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'ojbref'))) { |
$xref['trailer']['info'] = $sarr[($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; |
} |
$i = 0; // count bytes on the row |
// for every column |
for ($c = 0; $c < 3; ++$c) { |
// for every byte on the column |
for ($b = 0; $b < $wb[$c]; ++$b) { |
$sdata[$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 |
++$obj_num; |
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] = $row[1]; |
} |
++$obj_num; |
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; |
} |
} |
} |
} // 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 $this->getRawObject($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'; |
$offset += 6; |
if (preg_match('/^([\r\n]+)/isU', substr($this->pdfdata, $offset), $matches) == 1) { |
$offset += strlen($matches[0]); |
} |
if (preg_match('/([\r\n]*endstream)/isU', substr($this->pdfdata, $offset), $matches, PREG_OFFSET_CAPTURE) == 1) { |
$objval = substr($this->pdfdata, $offset, $matches[0][1]); |
$offset += $matches[0][1]; |
} |
} elseif (substr($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 = '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[($i - 1)][1], substr($element[1], 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, $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 |
//============================================================+ |