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tcpdi_parser.php
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<?php
//============================================================+
// File name : tcpdi_parser.php
// Version : 1.1
// Begin : 2013-09-25
// Last Update : 2016-05-03
// Author : Paul Nicholls - https://github.com/pauln
// License : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
//
// Based on : 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 - [email protected]
// License : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
// -------------------------------------------------------------------
// Copyright (C) 2011-2013 Nicola Asuni - Tecnick.com LTD
//
// This file is for use with the TCPDF software library.
//
// tcpdi_parser 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.
//
// tcpdi_parser 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 tcpdi_parser. If not, see
// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
//
// See LICENSE 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>
* @author Paul Nicholls
* @author Nicola Asuni
* @version 1.1
*/
if (!defined('PDF_TYPE_NULL')) {
define('PDF_TYPE_NULL', 0);
}
if (!defined('PDF_TYPE_NUMERIC')) {
define('PDF_TYPE_NUMERIC', 1);
}
if (!defined('PDF_TYPE_TOKEN')) {
define('PDF_TYPE_TOKEN', 2);
}
if (!defined('PDF_TYPE_HEX')) {
define('PDF_TYPE_HEX', 3);
}
if (!defined('PDF_TYPE_STRING')) {
define('PDF_TYPE_STRING', 4);
}
if (!defined('PDF_TYPE_DICTIONARY')) {
define('PDF_TYPE_DICTIONARY', 5);
}
if (!defined('PDF_TYPE_ARRAY')) {
define('PDF_TYPE_ARRAY', 6);
}
if (!defined('PDF_TYPE_OBJDEC')) {
define('PDF_TYPE_OBJDEC', 7);
}
if (!defined('PDF_TYPE_OBJREF')) {
define('PDF_TYPE_OBJREF', 8);
}
if (!defined('PDF_TYPE_OBJECT')) {
define('PDF_TYPE_OBJECT', 9);
}
if (!defined('PDF_TYPE_STREAM')) {
define('PDF_TYPE_STREAM', 10);
}
if (!defined('PDF_TYPE_BOOLEAN')) {
define('PDF_TYPE_BOOLEAN', 11);
}
if (!defined('PDF_TYPE_REAL')) {
define('PDF_TYPE_REAL', 12);
}
/**
* @class tcpdi_parser
* This is a PHP class for parsing PDF documents.<br>
* Based on TCPDF_PARSER, part of the TCPDF project by Nicola Asuni.
* @brief This is a PHP class for parsing PDF documents..
* @version 1.1
* @author Paul Nicholls - github.com/pauln
* @author Nicola Asuni - [email protected]
*/
class tcpdi_parser
{
/**
* Unique parser ID
* @public
*/
public $uniqueid = '';
/**
* Raw content of the PDF document.
* @private
*/
private $pdfdata;
/**
* XREF data.
* @protected
*/
protected $xref = [];
/**
* Object streams.
* @protected
*/
protected $objstreams = [];
/**
* Objects in objstreams.
* @protected
*/
protected $objstreamobjs = [];
/**
* List of seen XREF data locations.
* @protected
*/
protected $xref_seen_offsets = [];
/**
* Array of PDF objects.
* @protected
*/
protected $objects = [];
/**
* Array of object offsets.
* @private
*/
private $objoffsets = [];
/**
* Class object for decoding filters.
* @private
*/
private $FilterDecoders;
/**
* Pages
*
* @private array
*/
private $pages;
/**
* Page count
* @private integer
*/
private $page_count;
/**
* actual page number
* @private integer
*/
private $pageno;
/**
* PDF version of the loaded document
* @private string
*/
private $pdfVersion;
/**
* Available BoxTypes
*
* @public array
*/
public $availableBoxes = ['/MediaBox', '/CropBox', '/BleedBox', '/TrimBox', '/ArtBox'];
// -----------------------------------------------------------------------------
/**
* Parse a PDF document an return an array of objects.
* @param $data (string) PDF data to parse.
* @public
* @throws TcpdiParserException
* @since 1.0.000 (2011-05-24)
*/
public function __construct($data, $uniqueid)
{
if (empty($data)) {
$this->error('Empty PDF data.');
}
$this->uniqueid = $uniqueid;
$this->pdfdata = $data;
// get length
// initialize class for decoding filters
$this->FilterDecoders = new TCPDF_FILTERS();
// get xref and trailer data
$this->xref = $this->getXrefData();
$this->findObjectOffsets();
// parse all document objects
$this->objects = [];
$this->getPDFVersion();
$this->readPages();
}
/**
* Clean up when done, to free memory etc
*/
public function cleanUp()
{
unset($this->pdfdata);
$this->pdfdata = '';
unset($this->objstreams);
$this->objstreams = [];
unset($this->objects);
$this->objects = [];
unset($this->objstreamobjs);
$this->objstreamobjs = [];
unset($this->xref);
$this->xref = [];
unset($this->objoffsets);
$this->objoffsets = [];
unset($this->pages);
$this->pages = [];
}
/**
* Return an array of parsed PDF document objects.
* @return array Array of parsed PDF document objects.
* @public
* @since 1.0.000 (2011-06-26)
*/
public function getParsedData(): array
{
return [$this->xref, $this->objects, $this->pages];
}
/**
* Get PDF-Version
*
* And reset the PDF Version used in FPDI if needed
* @public
*/
public function getPDFVersion()
{
preg_match('/\d\.\d/', substr($this->pdfdata, 0, 16), $m);
if (isset($m[0])) {
$this->pdfVersion = $m[0];
}
return $this->pdfVersion;
}
/**
* Read all /Page(es)
*
*/
function readPages()
{
$params = $this->getObjectVal($this->xref['trailer'][1]['/Root']);
$objref = null;
if ($params && $params[1] && is_array($params[1][1])) {
foreach ($params[1][1] as $k => $v) {
if ($k == '/Pages') {
$objref = $v;
break;
}
}
}
if ($objref == null || $objref[0] !== PDF_TYPE_OBJREF) {
// Offset not found.
return;
}
$dict = $this->getObjectVal($objref);
if (is_array($dict) && $dict[0] == PDF_TYPE_OBJECT &&
isset($dict[1]) && is_array($dict[1]) && $dict[1][0] == PDF_TYPE_DICTIONARY) {
// Dict wrapped in an object
$dict = $dict[1];
}
if (!is_array($dict) || $dict[0] !== PDF_TYPE_DICTIONARY) {
return;
}
$this->pages = [];
if (isset($dict[1]['/Kids']) && is_array($dict[1]['/Kids'])) {
$v = $dict[1]['/Kids'];
if ($v[0] == PDF_TYPE_ARRAY && isset($v[1]) && is_array($v[1])) {
foreach ($v[1] as $ref) {
$page = $this->getObjectVal($ref);
$this->readPage($page);
}
}
}
$this->page_count = count($this->pages);
}
/**
* Read a single /Page element, recursing through /Kids if necessary
*
*/
private function readPage($page)
{
if (isset($page[1][1]['/Kids'])) {
// Nested pages!
foreach ($page[1][1]['/Kids'][1] as $subref) {
$subpage = $this->getObjectVal($subref);
$this->readPage($subpage);
}
} else {
$this->pages[] = $page;
}
}
/**
* Get pagecount from sourcefile
*
* @return int
*/
public function getPageCount(): int
{
return $this->page_count ?? 0;
}
/**
* 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 Array containing xref and trailer data.
* @protected
* @throws TcpdiParserException
* @since 1.0.000 (2011-05-24)
*/
protected function getXrefData(int $offset = 0, array $xref = []): array
{
if ($offset == 0) {
// find last startxref
if (preg_match('/.*[\r\n]startxref[\s\r\n]+([0-9]+)[\s\r\n]+%%EOF/is', $this->pdfdata, $matches) == 0) {
$this->error('Unable to find startxref');
}
$startxref = (int) $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 = (int) $matches[1][0];
} else {
$this->error('Unable to find startxref');
}
}
unset($matches);
// DOMPDF gets the startxref wrong, giving us the linebreak before the xref starts.
$startxref += strspn($this->pdfdata, "\r\n", $startxref);
// check xref position
if (strpos($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 int $startxref Offset at which the xref section starts.
* @param array $xref Previous xref array (if any).
* @return array Array containing xref and trailer data.
* @protected
* @throws TcpdiParserException
* @since 1.0.000 (2011-06-20)
*/
protected function decodeXref(int $startxref, array $xref = []): array
{
$this->xref_seen_offsets[] = $startxref;
if (!isset($xref['xref_location'])) {
$xref['xref_location'] = $startxref;
$xref['max_object'] = 0;
}
// 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]) + $matches[0][1];
if (isset($matches[3][0]) && $matches[3][0] == 'n') {
// create unique object index: [object number]_[generation number]
$gen_num = intval($matches[2][0]);
// check if object already exist
if (!isset($xref['xref'][$obj_num][$gen_num])) {
// store object offset position
$xref['xref'][$obj_num][$gen_num] = intval($matches[1][0]);
}
++$obj_num;
$offset += 2;
} elseif (isset($matches[3][0]) && $matches[3][0] == 'f') {
++$obj_num;
$offset += 2;
} else {
// object number (index)
$obj_num = intval($matches[1][0] ?? 0);
}
}
unset($matches);
$xref['max_object'] = max($xref['max_object'], $obj_num);
// get trailer data
if (preg_match(
'/trailer[\s]*<<(.*)>>[\s\r\n]+(?:[%].*[\r\n]+)*startxref[\s\r\n]+/isU',
$this->pdfdata,
$matches,
PREG_OFFSET_CAPTURE,
$xoffset
) > 0) {
$trailer_data = $matches[1][0];
if (empty($xref['trailer'])) {
// get only the last updated version
$xref['trailer'] = [];
$xref['trailer'][0] = PDF_TYPE_DICTIONARY;
$xref['trailer'][1] = [];
// parse trailer_data
if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
$xref['trailer'][1]['/Size'] = [PDF_TYPE_NUMERIC, intval($matches[1])];
}
if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
$xref['trailer'][1]['/Root'] = [PDF_TYPE_OBJREF, intval($matches[1]), intval($matches[2])];
}
if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
$xref['trailer'][1]['/Encrypt'] = [PDF_TYPE_OBJREF, intval($matches[1]), intval($matches[2])];
}
if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
$xref['trailer'][1]['/Info'] = [PDF_TYPE_OBJREF, intval($matches[1]), intval($matches[2])];
}
if (preg_match('/ID[\s]*[\[][\s]*[<]([^>]*)[>][\s]*[<]([^>]*)[>]/i', $trailer_data, $matches) > 0) {
$xref['trailer'][1]['/ID'] = [PDF_TYPE_ARRAY, []];
$xref['trailer'][1]['/ID'][1][0] = [PDF_TYPE_HEX, $matches[1]];
$xref['trailer'][1]['/ID'][1][1] = [PDF_TYPE_HEX, $matches[2]];
}
}
if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
// get previous xref
$prevoffset = intval($matches[1]);
if (!in_array($prevoffset, $this->xref_seen_offsets)) {
$this->xref_seen_offsets[] = $prevoffset;
$xref = $this->getXrefData($prevoffset, $xref);
}
}
unset($matches);
} else {
$this->error('Unable to find trailer');
}
return $xref;
}
/**
* Decode the Cross-Reference Stream section
* @param int $startxref Offset at which the xref section starts.
* @param array $xref Previous xref array (if any).
* @return array Array containing xref and trailer data.
* @protected
* @since 1.0.003 (2013-03-16)
*/
protected function decodeXrefStream(int $startxref, array $xref = []): array
{
// try to read Cross-Reference Stream
[$xrefobj] = $this->getRawObject($startxref);
$xrefcrs = $this->getIndirectObject((string) $xrefobj[1], $startxref);
if (!isset($xref['xref_location'])) {
$xref['xref_location'] = $startxref;
$xref['max_object'] = 0;
}
if (!isset($xref['xref'])) {
$xref['xref'] = [];
}
if (empty($xref['trailer'])) {
// get only the last updated version
$xref['trailer'] = [];
$xref['trailer'][0] = PDF_TYPE_DICTIONARY;
$xref['trailer'][1] = [];
$filltrailer = true;
} else {
$filltrailer = false;
}
$valid_crs = false;
$sarr = $xrefcrs[0][1];
$keys = array_keys($sarr);
$columns = 1; // Default as per PDF 32000-1:2008.
$predictor = 1; // Default as per PDF 32000-1:2008.
foreach ($keys as $key) {
$v = $sarr[$key];
if ($key === '/Type' && is_array($v) && $v[0] == PDF_TYPE_TOKEN && isset($v[1]) && $v[1] === 'XRef') {
$valid_crs = true;
} elseif ($key === '/Index' && is_array($v) && $v[0] == PDF_TYPE_ARRAY && isset($v[1]) && count($v[1]) >= 2) {
// first object number in the subsection
$index_first = intval($v[1][0][1]);
// number of entries in the subsection
} elseif ($key === '/Prev' && is_array($v) && $v[0] == PDF_TYPE_NUMERIC) {
// get previous xref offset
$prevxref = intval($v[1]);
} elseif ($key === '/W' && is_array($v) && $v[0] == PDF_TYPE_ARRAY) {
// number of bytes (in the decoded stream) of the corresponding field
$wb = [];
$wb[0] = intval($v[1][0][1]);
$wb[1] = intval($v[1][1][1]);
$wb[2] = intval($v[1][2][1]);
} elseif ($key == '/DecodeParms' && is_array($v) && $v[0] == PDF_TYPE_DICTIONARY) {
$decpar = $v[1];
foreach ($decpar as $kdc => $vdc) {
if ($kdc == '/Columns' && $vdc[0] == PDF_TYPE_NUMERIC) {
$columns = intval($vdc[1]);
} elseif ($kdc == '/Predictor' && $vdc[0] == PDF_TYPE_NUMERIC) {
$predictor = intval($vdc[1]);
}
}
} elseif ($filltrailer) {
switch ($key) {
case '/Size':
case '/Root':
case '/Info':
case '/ID':
$xref['trailer'][1][$key] = $v;
break;
default:
break;
}
}
}
// decode data
$obj_num = 0;
if ($valid_crs && 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 = [];
// 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] = [];
// get PNG predictor value
if (empty($predictor)) {
$predictor = 10 + $row[0];
}
// for each byte on the row
for ($i = 1; $i <= $columns; ++$i) {
if (!isset($row[$i])) {
// No more data in this row - we're done here.
break;
}
// 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 1: // No prediction (equivalent to PNG None)
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 $predictor");
}
}
$prev_row = $ddata[$k];
} // end for each row
// complete decoding
unset($sdata);
$sdata = [];
// for every row
foreach ($ddata as $k => $row) {
// initialize new row
$sdata[$k] = [0, 0, 0];
if (!isset($wb[0]) || $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
if (isset($wb[$c])) {
for ($b = 0; $b < $wb[$c]; ++$b) {
if (isset($row[$i])) {
$sdata[$k][$c] += $row[$i] << ($wb[$c] - 1 - $b) * 8;
}
++$i;
}
}
}
}
unset($ddata);
// fill xref
$obj_num = $index_first ?? 0;
foreach ($sdata as $row) {
switch ($row[0]) {
case 0:
// (f) linked list of free objects
++$obj_num;
break;
case 1:
// (n) objects that are in use but are not compressed
// create unique object index: [object number]_[generation number]
// check if object already exist
if (!isset($xref['xref'][$obj_num][$row[2]])) {
// store object offset position
$xref['xref'][$obj_num][$row[2]] = $row[1];
}
++$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];
$xref['xref'][$row[1]][0][$row[2]] = -1;*/
break;
default:
// null objects
break;
}
}
} // end decoding data
$xref['max_object'] = max($xref['max_object'], $obj_num);
if (isset($prevxref)) {
// get previous xref
$xref = $this->getXrefData($prevxref, $xref);
}
return $xref;
}
/**
* Get raw stream data
* @param int $offset Stream offset.
* @param int $length Stream length.
* @return array Steam content
* @protected
*/
protected function getRawStream(int $offset, int $length): array
{
$offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset);
$offset += 6; // "stream"
$offset += strspn($this->pdfdata, "\x20", $offset);
$offset += strspn($this->pdfdata, "\r\n", $offset);
$obj = [];
$obj[] = PDF_TYPE_STREAM;
$obj[] = substr($this->pdfdata, $offset, $length);
return [$obj, $offset + $length];
}
/**
* Get object type, raw value and offset to next object
* @param int $offset 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(int $offset = 0, ?string $data = null): array
{
if ($data == null) {
$data =& $this->pdfdata;
}
$objtype = ''; // object type to be returned
$objval = ''; // object value to be returned
// We have a bad offset, this is likely due to poor initial authoring. Return an empty object to break out of the loop and not error out due to an unspecified offset.
if(!isset($data[$offset]))
{
return [[ $objval, $objtype], 0];
}
// skip initial white space chars: \x00 null (NUL), \x09 horizontal tab (HT), \x0A line feed (LF), \x0C form feed (FF), \x0D carriage return (CR), \x20 space (SP)
while (strspn($data[$offset], "\x00\x09\x0a\x0c\x0d\x20") == 1) {
$offset++;
}
// get first char
$char = $data[$offset];
// get object type
switch ($char) {
case '%':
// \x25 PERCENT SIGN
// skip comment and search for next token
$next = strcspn($data, "\r\n", $offset);
if ($next > 0) {
$offset += $next;
return $this->getRawObject($offset, $data);
}
break;
case '/':
// \x2F SOLIDUS
// name object
$objtype = PDF_TYPE_TOKEN;
++$offset;
$length = strcspn($data, "\x00\x09\x0a\x0c\x0d\x20\x28\x29\x3c\x3e\x5b\x5d\x7b\x7d\x2f\x25", $offset);
$objval = substr($data, $offset, $length);
$offset += $length;
break;
case '(': // \x28 LEFT PARENTHESIS
case ')':
// \x29 RIGHT PARENTHESIS
// literal string object
$objtype = PDF_TYPE_STRING;
++$offset;
$strpos = $offset;
if ($char == '(') {
$open_bracket = 1;
while ($open_bracket > 0) {
if (!isset($data[$strpos])) {
break;
}
$ch = $data[$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;
}
$objval = substr($data, $offset, $strpos - $offset - 1);
$offset = $strpos;
}
break;
case '[': // \x5B LEFT SQUARE BRACKET
case ']':
// \x5D RIGHT SQUARE BRACKET
// array object
$objtype = PDF_TYPE_ARRAY;
++$offset;
if ($char == '[') {
// get array content
$objval = [];
do {
// get element
[$element, $offset] = $this->getRawObject($offset, $data);
$objval[] = $element;
} while ($element[0] !== ']');
// remove closing delimiter
array_pop($objval);
} else {
$objtype = ']';
}
break;
case '<': // \x3C LESS-THAN SIGN
case '>':
// \x3E GREATER-THAN SIGN
if (isset($data[($offset + 1)]) && $data[($offset + 1)] == $char) {
// dictionary object
$objtype = PDF_TYPE_DICTIONARY;
if ($char == '<') {
list ($objval, $offset) = $this->getDictValue($offset, $data);
} else {
$objtype = '>>';
$offset += 2;
}
} else {
// hexadecimal string object
$objtype = PDF_TYPE_HEX;
++$offset;
// The "Panose" entry in the FontDescriptor Style dict seems to have hex bytes separated by spaces.
if ($char == '<' && preg_match(
'/^([0-9A-Fa-f ]+)[>]/iU',
substr($data, $offset),
$matches
) == 1) {
$objval = $matches[1];
$offset += strlen($matches[0]);
unset($matches);
}
}
break;
default:
$frag = $data[ $offset ] ?? '';
$frag .= $data[ $offset + 1 ] ?? '';
$frag .= $data[ $offset + 2 ] ?? '';
$frag .= $data[ $offset + 3 ] ?? '';
switch ($frag) {
case 'endo':
// indirect object
$objtype = 'endobj';
$offset += 6;
break;
case 'stre':
// Streams should always be indirect objects, and thus processed by getRawStream().
// If we get here, treat it as a null object as something has gone wrong.
case 'null':
// null object
$objtype = PDF_TYPE_NULL;
$offset += 4;
$objval = 'null';
break;
case 'true':
// boolean true object
$objtype = PDF_TYPE_BOOLEAN;
$offset += 4;
$objval = true;
break;
case 'fals':
// boolean false object
$objtype = PDF_TYPE_BOOLEAN;
$offset += 5;
$objval = false;
break;
case 'ends':
// end stream object
$objtype = 'endstream';
$offset += 9;
break;
default:
if (preg_match(
'/^([0-9]+)[\s]+([0-9]+)[\s]+([Robj]{1,3})/i',
substr($data, $offset, 33),
$matches
) == 1) {
if ($matches[3] == 'R') {
// indirect object reference
$objtype = PDF_TYPE_OBJREF;
$offset += strlen($matches[0]);
$objval = [intval($matches[1]), intval($matches[2])];
} elseif ($matches[3] == 'obj') {
// object start
$objtype = PDF_TYPE_OBJECT;
$objval = intval($matches[1]) . '_' . intval($matches[2]);
$offset += strlen($matches[0]);
}
} elseif (($numlen = strspn($data, '+-.0123456789', $offset)) > 0) {
// numeric object
$objval = substr($data, $offset, $numlen);
$objtype = intval($objval) != $objval ? PDF_TYPE_REAL : PDF_TYPE_NUMERIC;
$offset += $numlen;
}
unset($matches);
break;
break;
}
}
$obj = [];
$obj[] = $objtype;
if ($objtype == PDF_TYPE_OBJREF && is_array($objval)) {
foreach ($objval as $val) {
$obj[] = $val;
}
} else {
$obj[] = $objval;
}
return [$obj, $offset];
}
private function getDictValue(int $offset, string $data): array
{
$objval = [];
// Extract dict from data.
$i=2;
$dict = '';
$offset += 2;
do {
if ($data[$offset] == '>' && $data[$offset+1] == '>') {
$i -= 2;
$dict .= '>>';
$offset += 2;
} else if ($data[$offset] == '<' && $data[$offset+1] == '<') {
$i += 2;
$dict .= '<<';
$offset += 2;
} else {
if ($data[$offset] == '<') {
$i++;
} else if ($data[$offset] == '>') {
$i--;
}
$dict .= $data[$offset];
$offset++;
}
} while ($i>0);
// Now that we have just the dict, parse it.
$dictoffset = 0;
do {
// Get dict element.
[$key, $eloffset] = $this->getRawObject($dictoffset, $dict);
if ($key[0] == '>>') {
break;
}
[$element, $dictoffset] = $this->getRawObject($eloffset, $dict);
$objval['/' . $key[1]] = $element;
unset($key);
unset($element);
} while (true);
return [$objval, $offset];
}
/**
* Get content of indirect object.
* @param string $obj_ref Object number and generation number separated by underscore character.
* @param int $offset Object offset.
* @param bool $decoding If true decode streams.
* @return array containing object data.
* @protected
* @since 1.0.000 (2011-05-24)
*/
protected function getIndirectObject(string $obj_ref, int $offset = 0, bool $decoding = true): array
{
$obj = explode('_', $obj_ref);
if ($obj === false || count($obj) != 2) {