mirror of
https://github.com/vdm-io/tcpdf.git
synced 2024-11-26 06:17:33 +00:00
39528a1441
- Some unused vars were removed from AddFont() method. - Some directories were moved inside the examples directory. - All examples were updated to reflect the new default structure. - Source code were clean-up up to be more compatible with system packaging. - Files encodings and permissions were reset. - The command line tool tcpdf_addfont.php was added on the tools directory.
746 lines
24 KiB
PHP
746 lines
24 KiB
PHP
<?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
|
|
//============================================================+
|