mirror of
https://github.com/OpenXE-org/OpenXE.git
synced 2024-12-26 14:40:29 +01:00
641 lines
18 KiB
PHP
641 lines
18 KiB
PHP
<?php
|
|
//
|
|
// FPDI - Version 1.1
|
|
//
|
|
// Copyright 2004,2005 Setasign - Jan Slabon
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
|
|
define ('PROBLEM_FPDF', 'Das Briefpapier PDF ist nicht kompatibel mit WaWision. Mehr Infos hier: <a href="https://www.wawision.de/akademie-faq/systemvoraussetzungen-hd-pdf-aufrufen-geht-nicht-fehlermeldung-fpdf-error-unable-to-find-pointer-to-xref-table-oder-fpdf-error-unable-to-find-xref-table-maybe-a-problem-with-auto-detect-line-endings">https://www.wawision.de/akademie-faq/systemvoraussetzungen-hd-pdf-aufrufen-geht-nicht-fehlermeldung-fpdf-error-unable-to-find-pointer-to-xref-table-oder-fpdf-error-unable-to-find-xref-table-maybe-a-problem-with-auto-detect-line-endings</a>');
|
|
|
|
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);
|
|
|
|
require_once("pdf_context.php");
|
|
|
|
class pdf_parser {
|
|
|
|
/**
|
|
* Filename
|
|
* @var string
|
|
*/
|
|
var $filename;
|
|
|
|
/**
|
|
* File resource
|
|
* @var resource
|
|
*/
|
|
var $f;
|
|
|
|
/**
|
|
* PDF Context
|
|
* @var object pdf_context-Instance
|
|
*/
|
|
var $c;
|
|
|
|
/**
|
|
* xref-Data
|
|
* @var array
|
|
*/
|
|
var $xref;
|
|
|
|
/**
|
|
* root-Object
|
|
* @var array
|
|
*/
|
|
var $root;
|
|
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* @param string $filename Source-Filename
|
|
*/
|
|
public function __construct($filename) {
|
|
$this->filename = $filename;
|
|
|
|
$this->f = @fopen($this->filename,"rb");
|
|
|
|
if (!$this->f)
|
|
$this->error(sprintf("Cannot open %s !",$filename));
|
|
|
|
$this->getPDFVersion();
|
|
|
|
$this->c = new pdf_context($this->f);
|
|
// Read xref-Data
|
|
$this->pdf_read_xref($this->xref, $this->pdf_find_xref());
|
|
|
|
// Check for Encryption
|
|
$this->getEncryption();
|
|
|
|
// Read root
|
|
$this->pdf_read_root();
|
|
}
|
|
|
|
public function __destruct()
|
|
{
|
|
$this->closeFile();
|
|
}
|
|
|
|
/**
|
|
* Close the opened file
|
|
*/
|
|
public function closeFile() {
|
|
if (!empty($this->f)) {
|
|
fclose($this->f);
|
|
$this->f = null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Print Error and die
|
|
*
|
|
* @param string $msg Error-Message
|
|
*/
|
|
function error($msg) {
|
|
die("<b>PDF-Parser Error:</b> ".$msg);
|
|
}
|
|
|
|
/**
|
|
* Check Trailer for Encryption
|
|
*/
|
|
function getEncryption() {
|
|
if (isset($this->xref['trailer'][1]['/Encrypt'])) {
|
|
$this->error("File is encrypted!");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Find/Return /Root
|
|
*
|
|
* @return array
|
|
*/
|
|
function pdf_find_root() {
|
|
if ($this->xref['trailer'][1]['/Root'][0] != PDF_TYPE_OBJREF) {
|
|
$this->Error("Wrong Type of Root-Element! Must be an indirect reference");
|
|
}
|
|
return $this->xref['trailer'][1]['/Root'];
|
|
}
|
|
|
|
/**
|
|
* Read the /Root
|
|
*/
|
|
function pdf_read_root() {
|
|
// read root
|
|
$this->root = $this->pdf_resolve_object($this->c, $this->pdf_find_root());
|
|
}
|
|
|
|
/**
|
|
* Get PDF-Version
|
|
*
|
|
* And reset the PDF Version used in FPDI if needed
|
|
*/
|
|
function getPDFVersion() {
|
|
fseek($this->f, 0);
|
|
preg_match("/\d\.\d/",fread($this->f,16),$m);
|
|
$this->pdfVersion = $m[0];
|
|
}
|
|
|
|
/**
|
|
* Find the xref-Table
|
|
*/
|
|
function pdf_find_xref() {
|
|
fseek ($this->f, -50, SEEK_END);
|
|
$data = fread($this->f, 50);
|
|
|
|
if (!preg_match('/startxref\s*(\d+)\s*%%EOF\s*$/', $data, $matches)) {
|
|
$this->error(PROBLEM_FPDF." (Unable to find pointer to xref table)"); //BENE
|
|
}
|
|
|
|
return (int) $matches[1];
|
|
}
|
|
|
|
/**
|
|
* Read xref-table
|
|
*
|
|
* @param array $result Array of xref-table
|
|
* @param integer $offset of xref-table
|
|
* @param integer $start start-position in xref-table
|
|
* @param integer $end end-position in xref-table
|
|
*/
|
|
function pdf_read_xref(&$result, $offset, $start = null, $end = null) {
|
|
if (is_null ($start) || is_null ($end)) {
|
|
fseek($this->f, $o_pos = $offset);
|
|
$data = trim(fgets($this->f));
|
|
|
|
if ($data !== 'xref') {
|
|
fseek($this->f, $o_pos);
|
|
$data = trim(_fgets($this->f, true));
|
|
|
|
if ($data !== 'xref') {
|
|
$this->error(PROBLEM_FPDF." (Unable to find xref table - Maybe a Problem with 'auto_detect_line_endings')"); //BENE
|
|
}
|
|
}
|
|
|
|
$o_pos = ftell($this->f);
|
|
$data = explode(' ', trim(fgets($this->f)));
|
|
if (count($data) != 2) {
|
|
fseek($this->f, $o_pos);
|
|
$data = explode(' ', trim(_fgets($this->f, true)));
|
|
|
|
if (count($data) != 2)
|
|
$this->error("Unexpected header in xref table");
|
|
}
|
|
$start = $data[0];
|
|
$end = $start + $data[1];
|
|
}
|
|
|
|
if (!isset($result['xref_location'])) {
|
|
$result['xref_location'] = $offset;
|
|
}
|
|
|
|
if (!isset($result['max_object']) || $end > $result['max_object']) {
|
|
$result['max_object'] = $end;
|
|
}
|
|
|
|
for (; $start < $end; $start++) {
|
|
$data = fread($this->f, 20); // Spezifications says: 20 bytes including newlines
|
|
$offset = substr($data, 0, 10);
|
|
$generation = substr($data, 11, 5);
|
|
|
|
if (!isset ($result['xref'][$start][(int) $generation])) {
|
|
$result['xref'][$start][(int) $generation] = (int) $offset;
|
|
}
|
|
}
|
|
|
|
$o_pos = ftell($this->f);
|
|
$data = fgets($this->f);
|
|
|
|
if (preg_match("/trailer/",$data)) {
|
|
if (preg_match("/(.*trailer[ \n\r]+)/",$data,$m)) {
|
|
fseek($this->f, $o_pos+strlen($m[1]));
|
|
}
|
|
|
|
$c = new pdf_context($this->f);
|
|
$trailer = $this->pdf_read_value($c);
|
|
|
|
if (isset($trailer[1]['/Prev'])) {
|
|
$this->pdf_read_xref($result, $trailer[1]['/Prev'][1]);
|
|
$result['trailer'][1] = array_merge($result['trailer'][1], $trailer[1]);
|
|
} else {
|
|
$result['trailer'] = $trailer;
|
|
}
|
|
} else {
|
|
$data = explode(' ', trim($data));
|
|
|
|
if (count($data) != 2) {
|
|
fseek($this->f, $o_pos);
|
|
$data = explode(' ', trim (_fgets ($this->f, true)));
|
|
|
|
if (count($data) != 2) {
|
|
$this->error("Unexpected data in xref table"); //PDF
|
|
}
|
|
}
|
|
|
|
$this->pdf_read_xref($result, null, (int) $data[0], (int) $data[0] + (int) $data[1]);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Reads an Value
|
|
*
|
|
* @param object $c pdf_context
|
|
* @param string $token a Token
|
|
* @return mixed
|
|
*/
|
|
function pdf_read_value(&$c, $token = null) {
|
|
if (is_null($token)) {
|
|
$token = $this->pdf_read_token($c);
|
|
}
|
|
|
|
if ($token === false) {
|
|
return false;
|
|
}
|
|
|
|
switch ($token) {
|
|
case '<':
|
|
// This is a hex string.
|
|
// Read the value, then the terminator
|
|
|
|
$pos = $c->offset;
|
|
|
|
while(1) {
|
|
|
|
$match = strpos ($c->buffer, '>', $pos);
|
|
|
|
// If you can't find it, try
|
|
// reading more data from the stream
|
|
|
|
if ($match === false) {
|
|
if (!$c->increase_length()) {
|
|
return false;
|
|
} else {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
$result = substr ($c->buffer, $c->offset, $match - $c->offset);
|
|
$c->offset = $match+1;
|
|
|
|
return array (PDF_TYPE_HEX, $result);
|
|
}
|
|
|
|
break;
|
|
case '<<':
|
|
// This is a dictionary.
|
|
|
|
$result = array();
|
|
|
|
// Recurse into this function until we reach
|
|
// the end of the dictionary.
|
|
while (($key = $this->pdf_read_token($c)) !== '>>') {
|
|
if ($key === false) {
|
|
return false;
|
|
}
|
|
|
|
if (($value = $this->pdf_read_value($c)) === false) {
|
|
return false;
|
|
}
|
|
$result[$key] = $value;
|
|
}
|
|
|
|
return array (PDF_TYPE_DICTIONARY, $result);
|
|
|
|
case '[':
|
|
// This is an array.
|
|
|
|
$result = array();
|
|
|
|
// Recurse into this function until we reach
|
|
// the end of the array.
|
|
while (($token = $this->pdf_read_token($c)) !== ']') {
|
|
if ($token === false) {
|
|
return false;
|
|
}
|
|
|
|
if (($value = $this->pdf_read_value($c, $token)) === false) {
|
|
return false;
|
|
}
|
|
|
|
$result[] = $value;
|
|
}
|
|
|
|
return array (PDF_TYPE_ARRAY, $result);
|
|
|
|
case '(' :
|
|
// This is a string
|
|
|
|
$pos = $c->offset;
|
|
|
|
while(1) {
|
|
|
|
// Start by finding the next closed
|
|
// parenthesis
|
|
|
|
$match = strpos ($c->buffer, ')', $pos);
|
|
|
|
// If you can't find it, try
|
|
// reading more data from the stream
|
|
|
|
if ($match === false) {
|
|
if (!$c->increase_length()) {
|
|
return false;
|
|
} else {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// Make sure that there is no backslash
|
|
// before the parenthesis. If there is,
|
|
// move on. Otherwise, return the string.
|
|
|
|
if (isset($c->buffer[$match - 1]) && $c->buffer[$match - 1] !== '\\' ||
|
|
isset($c->buffer[$match - 1]) && $c->buffer[$match - 1] === '\\' && isset($c->buffer[$match - 2]) && $c->buffer[$match - 2] === '\\') {
|
|
$result = substr ($c->buffer, $c->offset, $match - $c->offset);
|
|
$c->offset = $match + 1;
|
|
return array (PDF_TYPE_STRING, $result);
|
|
} else {
|
|
$pos = $match + 1;
|
|
|
|
if ($pos > $c->offset + $c->length) {
|
|
$c->increase_length();
|
|
}
|
|
}
|
|
}
|
|
|
|
case "stream":
|
|
$o_pos = ftell($c->file)-strlen($c->buffer);
|
|
$o_offset = $c->offset;
|
|
|
|
$c->reset($startpos = $o_pos + $o_offset);
|
|
|
|
$e = 0; // ensure line breaks in front of the stream
|
|
if ($c->buffer[0] == chr(10) || $c->buffer[0] == chr(13))
|
|
$e++;
|
|
if ($c->buffer[1] == chr(10) && $c->buffer[0] != chr(10))
|
|
$e++;
|
|
|
|
if ($this->actual_obj[1][1]['/Length'][0] == PDF_TYPE_OBJREF) {
|
|
$tmp_c = new pdf_context($this->f);
|
|
$tmp_length = $this->pdf_resolve_object($tmp_c,$this->actual_obj[1][1]['/Length']);
|
|
$length = $tmp_length[1][1];
|
|
} else {
|
|
$length = $this->actual_obj[1][1]['/Length'][1];
|
|
}
|
|
|
|
$c->reset($startpos+$e,$length);
|
|
$v = $c->buffer;
|
|
$c->reset($startpos+$e+$length+strlen("endstream"));
|
|
|
|
return array(PDF_TYPE_STREAM, $v);
|
|
|
|
default :
|
|
if (is_numeric ($token)) {
|
|
// A numeric token. Make sure that
|
|
// it is not part of something else.
|
|
if (($tok2 = $this->pdf_read_token ($c)) !== false) {
|
|
if (is_numeric ($tok2)) {
|
|
|
|
// Two numeric tokens in a row.
|
|
// In this case, we're probably in
|
|
// front of either an object reference
|
|
// or an object specification.
|
|
// Determine the case and return the data
|
|
if (($tok3 = $this->pdf_read_token ($c)) !== false) {
|
|
switch ($tok3) {
|
|
case 'obj' :
|
|
return array (PDF_TYPE_OBJDEC, (int) $token, (int) $tok2);
|
|
case 'R' :
|
|
return array (PDF_TYPE_OBJREF, (int) $token, (int) $tok2);
|
|
}
|
|
// If we get to this point, that numeric value up
|
|
// there was just a numeric value. Push the extra
|
|
// tokens back into the stack and return the value.
|
|
array_push ($c->stack, $tok3);
|
|
}
|
|
}
|
|
|
|
array_push ($c->stack, $tok2);
|
|
}
|
|
|
|
return array (PDF_TYPE_NUMERIC, $token);
|
|
} else {
|
|
|
|
// Just a token. Return it.
|
|
return array (PDF_TYPE_TOKEN, $token);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Resolve an object
|
|
*
|
|
* @param object $c pdf_context
|
|
* @param array $obj_spec The object-data
|
|
* @param boolean $encapsulate Must set to true, cause the parsing and fpdi use this method only without this para
|
|
*/
|
|
function pdf_resolve_object(&$c, $obj_spec, $encapsulate = true) {
|
|
// Exit if we get invalid data
|
|
if (!is_array($obj_spec)) {
|
|
return false;
|
|
}
|
|
|
|
if ($obj_spec[0] == PDF_TYPE_OBJREF) {
|
|
|
|
// This is a reference, resolve it
|
|
if (isset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]])) {
|
|
|
|
// Save current file position
|
|
// This is needed if you want to resolve
|
|
// references while you're reading another object
|
|
// (e.g.: if you need to determine the length
|
|
// of a stream)
|
|
|
|
$old_pos = ftell($c->file);
|
|
|
|
// Reposition the file pointer and
|
|
// load the object header.
|
|
|
|
$c->reset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]]);
|
|
|
|
$header = $this->pdf_read_value($c,null,true);
|
|
|
|
if ($header[0] != PDF_TYPE_OBJDEC || $header[1] != $obj_spec[1] || $header[2] != $obj_spec[2]) {
|
|
$this->error("Unable to find object ({$obj_spec[1]}, {$obj_spec[2]}) at expected location");
|
|
}
|
|
|
|
// If we're being asked to store all the information
|
|
// about the object, we add the object ID and generation
|
|
// number for later use
|
|
$this->actual_obj =& $result;
|
|
if ($encapsulate) {
|
|
$result = array (
|
|
PDF_TYPE_OBJECT,
|
|
'obj' => $obj_spec[1],
|
|
'gen' => $obj_spec[2]
|
|
);
|
|
} else {
|
|
$result = array();
|
|
}
|
|
|
|
// Now simply read the object data until
|
|
// we encounter an end-of-object marker
|
|
while(1) {
|
|
$value = $this->pdf_read_value($c);
|
|
if ($value === false || count($result) > 4) {
|
|
// in this case the parser coudn't find an endobj so we break here
|
|
break;
|
|
}
|
|
|
|
if ($value[0] == PDF_TYPE_TOKEN && $value[1] === 'endobj') {
|
|
break;
|
|
}
|
|
|
|
$result[] = $value;
|
|
}
|
|
|
|
$c->reset($old_pos);
|
|
|
|
if (isset($result[2][0]) && $result[2][0] == PDF_TYPE_STREAM) {
|
|
$result[0] = PDF_TYPE_STREAM;
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
} else {
|
|
return $obj_spec;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Reads a token from the file
|
|
*
|
|
* @param object $c pdf_context
|
|
* @return mixed
|
|
*/
|
|
function pdf_read_token(&$c)
|
|
{
|
|
// If there is a token available
|
|
// on the stack, pop it out and
|
|
// return it.
|
|
|
|
if (count($c->stack)) {
|
|
return array_pop($c->stack);
|
|
}
|
|
|
|
// Strip away any whitespace
|
|
|
|
do {
|
|
if (!$c->ensure_content()) {
|
|
return false;
|
|
}
|
|
$c->offset += _strspn($c->buffer, " \n\r", $c->offset);
|
|
} while ($c->offset >= $c->length - 1);
|
|
|
|
// Get the first character in the stream
|
|
|
|
$char = $c->buffer[$c->offset++];
|
|
|
|
switch ($char) {
|
|
|
|
case '[' :
|
|
case ']' :
|
|
case '(' :
|
|
case ')' :
|
|
|
|
// This is either an array or literal string
|
|
// delimiter, Return it
|
|
|
|
return $char;
|
|
|
|
case '<' :
|
|
case '>' :
|
|
|
|
// This could either be a hex string or
|
|
// dictionary delimiter. Determine the
|
|
// appropriate case and return the token
|
|
|
|
if ($c->buffer[$c->offset] == $char) {
|
|
if (!$c->ensure_content()) {
|
|
return false;
|
|
}
|
|
$c->offset++;
|
|
return $char . $char;
|
|
} else {
|
|
return $char;
|
|
}
|
|
|
|
default :
|
|
|
|
// This is "another" type of token (probably
|
|
// a dictionary entry or a numeric value)
|
|
// Find the end and return it.
|
|
|
|
if (!$c->ensure_content()) {
|
|
return false;
|
|
}
|
|
|
|
while(1) {
|
|
|
|
// Determine the length of the token
|
|
|
|
$pos = _strcspn($c->buffer, " []<>()\r\n\t/", $c->offset);
|
|
|
|
if ($c->offset + $pos <= $c->length - 1) {
|
|
break;
|
|
} else {
|
|
// If the script reaches this point,
|
|
// the token may span beyond the end
|
|
// of the current buffer. Therefore,
|
|
// we increase the size of the buffer
|
|
// and try again--just to be safe.
|
|
|
|
$c->increase_length();
|
|
}
|
|
}
|
|
|
|
$result = substr($c->buffer, $c->offset - 1, $pos + 1);
|
|
|
|
$c->offset += $pos;
|
|
return $result;
|
|
}
|
|
}
|
|
|
|
|
|
}
|