| 1 |
<?php |
| 2 |
// |
| 3 |
// FPDI - Version 1.2 |
| 4 |
// |
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// Copyright 2004-2007 Setasign - Jan Slabon |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
| 17 |
// limitations under the License. |
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// |
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|
| 20 |
if (!defined ('PDF_TYPE_NULL')) |
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define ('PDF_TYPE_NULL', 0); |
| 22 |
if (!defined ('PDF_TYPE_NUMERIC')) |
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define ('PDF_TYPE_NUMERIC', 1); |
| 24 |
if (!defined ('PDF_TYPE_TOKEN')) |
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define ('PDF_TYPE_TOKEN', 2); |
| 26 |
if (!defined ('PDF_TYPE_HEX')) |
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define ('PDF_TYPE_HEX', 3); |
| 28 |
if (!defined ('PDF_TYPE_STRING')) |
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define ('PDF_TYPE_STRING', 4); |
| 30 |
if (!defined ('PDF_TYPE_DICTIONARY')) |
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define ('PDF_TYPE_DICTIONARY', 5); |
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if (!defined ('PDF_TYPE_ARRAY')) |
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define ('PDF_TYPE_ARRAY', 6); |
| 34 |
if (!defined ('PDF_TYPE_OBJDEC')) |
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define ('PDF_TYPE_OBJDEC', 7); |
| 36 |
if (!defined ('PDF_TYPE_OBJREF')) |
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define ('PDF_TYPE_OBJREF', 8); |
| 38 |
if (!defined ('PDF_TYPE_OBJECT')) |
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define ('PDF_TYPE_OBJECT', 9); |
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if (!defined ('PDF_TYPE_STREAM')) |
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define ('PDF_TYPE_STREAM', 10); |
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|
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require_once(USCES_PLUGIN_DIR.'/classes/fpdf/pdf_context.php'); |
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require_once(USCES_PLUGIN_DIR.'/classes/fpdf/wrapper_functions.php'); |
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|
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class pdf_parser { |
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|
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/** |
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* Filename |
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* @var string |
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*/ |
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var $filename; |
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|
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/** |
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* File resource |
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* @var resource |
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*/ |
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var $f; |
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|
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/** |
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* PDF Context |
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* @var object pdf_context-Instance |
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*/ |
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var $c; |
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|
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/** |
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* xref-Data |
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* @var array |
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*/ |
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var $xref; |
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|
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/** |
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* root-Object |
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* @var array |
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*/ |
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var $root; |
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|
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|
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/** |
| 80 |
* Constructor |
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* |
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* @param string $filename Source-Filename |
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*/ |
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function pdf_parser($filename) { |
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$this->filename = $filename; |
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|
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$this->f = @fopen($this->filename, "rb"); |
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|
| 89 |
if (!$this->f) |
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$this->error(sprintf("Cannot open %s !", $filename)); |
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|
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$this->getPDFVersion(); |
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|
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$this->c = new pdf_context($this->f); |
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// Read xref-Data |
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$this->pdf_read_xref($this->xref, $this->pdf_find_xref()); |
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|
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// Check for Encryption |
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$this->getEncryption(); |
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|
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// Read root |
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$this->pdf_read_root(); |
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} |
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|
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/** |
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* Close the opened file |
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*/ |
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function closeFile() { |
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if (isset($this->f)) { |
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fclose($this->f); |
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unset($this->f); |
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} |
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} |
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|
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/** |
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* Print Error and die |
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* |
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* @param string $msg Error-Message |
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*/ |
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function error($msg) { |
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die("<b>PDF-Parser Error:</b> ".$msg); |
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} |
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|
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/** |
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* Check Trailer for Encryption |
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*/ |
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function getEncryption() { |
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if (isset($this->xref['trailer'][1]['/Encrypt'])) { |
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$this->error("File is encrypted!"); |
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} |
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} |
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|
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/** |
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* Find/Return /Root |
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* |
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* @return array |
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*/ |
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function pdf_find_root() { |
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if ($this->xref['trailer'][1]['/Root'][0] != PDF_TYPE_OBJREF) { |
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$this->error("Wrong Type of Root-Element! Must be an indirect reference"); |
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} |
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return $this->xref['trailer'][1]['/Root']; |
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} |
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|
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/** |
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* Read the /Root |
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*/ |
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function pdf_read_root() { |
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// read root |
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$this->root = $this->pdf_resolve_object($this->c, $this->pdf_find_root()); |
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} |
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|
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/** |
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* Get PDF-Version |
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* |
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* And reset the PDF Version used in FPDI if needed |
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*/ |
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function getPDFVersion() { |
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fseek($this->f, 0); |
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preg_match("/\d\.\d/",fread($this->f,16),$m); |
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$this->pdfVersion = $m[0]; |
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} |
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|
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/** |
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* Find the xref-Table |
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*/ |
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function pdf_find_xref() { |
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fseek ($this->f, -min(filesize($this->filename),1500), SEEK_END); |
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$data = fread($this->f, 1500); |
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|
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$pos = strlen($data) - strpos(strrev($data), strrev('startxref')); |
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$data = substr($data, $pos); |
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|
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if (!preg_match('/\s*(\d+).*$/s', $data, $matches)) { |
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$this->error("Unable to find pointer to xref table"); |
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} |
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|
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return (int) $matches[1]; |
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} |
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|
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/** |
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* Read xref-table |
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* |
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* @param array $result Array of xref-table |
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* @param integer $offset of xref-table |
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* @param integer $start start-position in xref-table |
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* @param integer $end end-position in xref-table |
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*/ |
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function pdf_read_xref(&$result, $offset, $start = null, $end = null) { |
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if (is_null ($start) || is_null ($end)) { |
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fseek($this->f, $o_pos = $offset); |
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$data = trim(fgets($this->f,1024)); |
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|
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if (strlen($data) == 0) |
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$data = trim(fgets($this->f,1024)); |
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|
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if ($data !== 'xref') { |
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fseek($this->f, $o_pos); |
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$data = trim(_fgets($this->f, true)); |
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if ($data !== 'xref') { |
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if (preg_match('/(.*xref)(.*)/m', $data, $m)) { // xref 0 128 - in one line |
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fseek($this->f, $o_pos+strlen($m[1])); |
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} elseif (preg_match('/(x|r|e|f)+/', $data, $m)) { // correct invalid xref-pointer |
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$tmpOffset = $offset-4+strlen($m[0]); |
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$this->pdf_read_xref($result, $tmpOffset, $start, $end); |
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return; |
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} else { |
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$this->error("Unable to find xref table - Maybe a Problem with 'auto_detect_line_endings'"); |
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} |
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} |
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} |
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|
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$o_pos = ftell($this->f); |
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$data = explode(' ', trim(fgets($this->f,1024))); |
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if (count($data) != 2) { |
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fseek($this->f, $o_pos); |
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$data = explode(' ', trim(_fgets($this->f, true))); |
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|
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if (count($data) != 2) { |
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if (count($data) > 2) { // no lineending |
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$n_pos = $o_pos+strlen($data[0])+strlen($data[1])+2; |
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fseek($this->f, $n_pos); |
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} else { |
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$this->error("Unexpected header in xref table"); |
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} |
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} |
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} |
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$start = $data[0]; |
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$end = $start + $data[1]; |
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} |
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|
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if (!isset($result['xref_location'])) { |
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$result['xref_location'] = $offset; |
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} |
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|
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if (!isset($result['max_object']) || $end > $result['max_object']) { |
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$result['max_object'] = $end; |
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} |
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|
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for (; $start < $end; $start++) { |
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$data = ltrim(fread($this->f, 20)); // Spezifications says: 20 bytes including newlines |
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$offset = substr($data, 0, 10); |
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$generation = substr($data, 11, 5); |
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|
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if (!isset ($result['xref'][$start][(int) $generation])) { |
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$result['xref'][$start][(int) $generation] = (int) $offset; |
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} |
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} |
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|
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$o_pos = ftell($this->f); |
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$data = fgets($this->f,1024); |
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if (strlen(trim($data)) == 0) |
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$data = fgets($this->f, 1024); |
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|
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if (preg_match("/trailer/",$data)) { |
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if (preg_match("/(.*trailer[ \n\r]*)/",$data,$m)) { |
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fseek($this->f, $o_pos+strlen($m[1])); |
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} |
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|
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$c = new pdf_context($this->f); |
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$trailer = $this->pdf_read_value($c); |
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|
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if (isset($trailer[1]['/Prev'])) { |
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$this->pdf_read_xref($result, $trailer[1]['/Prev'][1]); |
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$result['trailer'][1] = array_merge($result['trailer'][1], $trailer[1]); |
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} else { |
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$result['trailer'] = $trailer; |
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} |
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} else { |
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$data = explode(' ', trim($data)); |
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|
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if (count($data) != 2) { |
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fseek($this->f, $o_pos); |
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$data = explode(' ', trim (_fgets ($this->f, true))); |
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|
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if (count($data) != 2) { |
| 277 |
$this->error("Unexpected data in xref table"); |
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} |
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} |
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|
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$this->pdf_read_xref($result, null, (int) $data[0], (int) $data[0] + (int) $data[1]); |
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} |
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} |
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|
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|
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/** |
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* Reads an Value |
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* |
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* @param object $c pdf_context |
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* @param string $token a Token |
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* @return mixed |
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*/ |
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function pdf_read_value(&$c, $token = null) { |
| 294 |
if (is_null($token)) { |
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$token = $this->pdf_read_token($c); |
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} |
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|
| 298 |
if ($token === false) { |
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return false; |
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} |
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|
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switch ($token) { |
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case '<': |
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// This is a hex string. |
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// Read the value, then the terminator |
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|
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$pos = $c->offset; |
| 308 |
|
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while(1) { |
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|
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$match = strpos ($c->buffer, '>', $pos); |
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|
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// If you can't find it, try |
| 314 |
// reading more data from the stream |
| 315 |
|
| 316 |
if ($match === false) { |
| 317 |
if (!$c->increase_length()) { |
| 318 |
return false; |
| 319 |
} else { |
| 320 |
continue; |
| 321 |
} |
| 322 |
} |
| 323 |
|
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$result = substr ($c->buffer, $c->offset, $match - $c->offset); |
| 325 |
$c->offset = $match+1; |
| 326 |
|
| 327 |
return array (PDF_TYPE_HEX, $result); |
| 328 |
} |
| 329 |
|
| 330 |
break; |
| 331 |
case '<<': |
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// This is a dictionary. |
| 333 |
|
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$result = array(); |
| 335 |
|
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// Recurse into this function until we reach |
| 337 |
// the end of the dictionary. |
| 338 |
while (($key = $this->pdf_read_token($c)) !== '>>') { |
| 339 |
if ($key === false) { |
| 340 |
return false; |
| 341 |
} |
| 342 |
|
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if (($value = $this->pdf_read_value($c)) === false) { |
| 344 |
return false; |
| 345 |
} |
| 346 |
$result[$key] = $value; |
| 347 |
} |
| 348 |
|
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return array (PDF_TYPE_DICTIONARY, $result); |
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|
| 351 |
case '[': |
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// This is an array. |
| 353 |
|
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$result = array(); |
| 355 |
|
| 356 |
// Recurse into this function until we reach |
| 357 |
// the end of the array. |
| 358 |
while (($token = $this->pdf_read_token($c)) !== ']') { |
| 359 |
if ($token === false) { |
| 360 |
return false; |
| 361 |
} |
| 362 |
|
| 363 |
if (($value = $this->pdf_read_value($c, $token)) === false) { |
| 364 |
return false; |
| 365 |
} |
| 366 |
|
| 367 |
$result[] = $value; |
| 368 |
} |
| 369 |
|
| 370 |
return array (PDF_TYPE_ARRAY, $result); |
| 371 |
|
| 372 |
case '(' : |
| 373 |
// This is a string |
| 374 |
|
| 375 |
$pos = $c->offset; |
| 376 |
|
| 377 |
while(1) { |
| 378 |
|
| 379 |
// Start by finding the next closed |
| 380 |
// parenthesis |
| 381 |
|
| 382 |
$match = strpos ($c->buffer, ')', $pos); |
| 383 |
|
| 384 |
// If you can't find it, try |
| 385 |
// reading more data from the stream |
| 386 |
|
| 387 |
if ($match === false) { |
| 388 |
if (!$c->increase_length()) { |
| 389 |
return false; |
| 390 |
} else { |
| 391 |
continue; |
| 392 |
} |
| 393 |
} |
| 394 |
|
| 395 |
// Make sure that there is no backslash |
| 396 |
// before the parenthesis. If there is, |
| 397 |
// move on. Otherwise, return the string. |
| 398 |
$esc = preg_match('/([\\\\]+)$/', $tmpresult = substr($c->buffer, $c->offset, $match - $c->offset), $m); |
| 399 |
|
| 400 |
if ($esc === 0 || strlen($m[1]) % 2 == 0) { |
| 401 |
$result = $tmpresult; |
| 402 |
$c->offset = $match + 1; |
| 403 |
return array (PDF_TYPE_STRING, $result); |
| 404 |
} else { |
| 405 |
$pos = $match + 1; |
| 406 |
|
| 407 |
if ($pos > $c->offset + $c->length) { |
| 408 |
$c->increase_length(); |
| 409 |
} |
| 410 |
} |
| 411 |
} |
| 412 |
|
| 413 |
case "stream": |
| 414 |
$o_pos = ftell($c->file)-strlen($c->buffer); |
| 415 |
$o_offset = $c->offset; |
| 416 |
|
| 417 |
$c->reset($startpos = $o_pos + $o_offset); |
| 418 |
|
| 419 |
$e = 0; // ensure line breaks in front of the stream |
| 420 |
if ($c->buffer[0] == chr(10) || $c->buffer[0] == chr(13)) |
| 421 |
$e++; |
| 422 |
if ($c->buffer[1] == chr(10) && $c->buffer[0] != chr(10)) |
| 423 |
$e++; |
| 424 |
|
| 425 |
if ($this->actual_obj[1][1]['/Length'][0] == PDF_TYPE_OBJREF) { |
| 426 |
$tmp_c = new pdf_context($this->f); |
| 427 |
$tmp_length = $this->pdf_resolve_object($tmp_c,$this->actual_obj[1][1]['/Length']); |
| 428 |
$length = $tmp_length[1][1]; |
| 429 |
} else { |
| 430 |
$length = $this->actual_obj[1][1]['/Length'][1]; |
| 431 |
} |
| 432 |
|
| 433 |
if ($length > 0) { |
| 434 |
$c->reset($startpos+$e,$length); |
| 435 |
$v = $c->buffer; |
| 436 |
} else { |
| 437 |
$v = ''; |
| 438 |
} |
| 439 |
$c->reset($startpos+$e+$length+9); // 9 = strlen("endstream") |
| 440 |
|
| 441 |
return array(PDF_TYPE_STREAM, $v); |
| 442 |
|
| 443 |
default : |
| 444 |
if (is_numeric ($token)) { |
| 445 |
// A numeric token. Make sure that |
| 446 |
// it is not part of something else. |
| 447 |
if (($tok2 = $this->pdf_read_token ($c)) !== false) { |
| 448 |
if (is_numeric ($tok2)) { |
| 449 |
|
| 450 |
// Two numeric tokens in a row. |
| 451 |
// In this case, we're probably in |
| 452 |
// front of either an object reference |
| 453 |
// or an object specification. |
| 454 |
// Determine the case and return the data |
| 455 |
if (($tok3 = $this->pdf_read_token ($c)) !== false) { |
| 456 |
switch ($tok3) { |
| 457 |
case 'obj' : |
| 458 |
return array (PDF_TYPE_OBJDEC, (int) $token, (int) $tok2); |
| 459 |
case 'R' : |
| 460 |
return array (PDF_TYPE_OBJREF, (int) $token, (int) $tok2); |
| 461 |
} |
| 462 |
// If we get to this point, that numeric value up |
| 463 |
// there was just a numeric value. Push the extra |
| 464 |
// tokens back into the stack and return the value. |
| 465 |
array_push ($c->stack, $tok3); |
| 466 |
} |
| 467 |
} |
| 468 |
|
| 469 |
array_push ($c->stack, $tok2); |
| 470 |
} |
| 471 |
|
| 472 |
return array (PDF_TYPE_NUMERIC, $token); |
| 473 |
} else { |
| 474 |
|
| 475 |
// Just a token. Return it. |
| 476 |
return array (PDF_TYPE_TOKEN, $token); |
| 477 |
} |
| 478 |
|
| 479 |
} |
| 480 |
} |
| 481 |
|
| 482 |
/** |
| 483 |
* Resolve an object |
| 484 |
* |
| 485 |
* @param object $c pdf_context |
| 486 |
* @param array $obj_spec The object-data |
| 487 |
* @param boolean $encapsulate Must set to true, cause the parsing and fpdi use this method only without this para |
| 488 |
*/ |
| 489 |
function pdf_resolve_object(&$c, $obj_spec, $encapsulate = true) { |
| 490 |
// Exit if we get invalid data |
| 491 |
if (!is_array($obj_spec)) { |
| 492 |
return false; |
| 493 |
} |
| 494 |
|
| 495 |
if ($obj_spec[0] == PDF_TYPE_OBJREF) { |
| 496 |
|
| 497 |
// This is a reference, resolve it |
| 498 |
if (isset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]])) { |
| 499 |
|
| 500 |
// Save current file position |
| 501 |
// This is needed if you want to resolve |
| 502 |
// references while you're reading another object |
| 503 |
// (e.g.: if you need to determine the length |
| 504 |
// of a stream) |
| 505 |
|
| 506 |
$old_pos = ftell($c->file); |
| 507 |
|
| 508 |
// Reposition the file pointer and |
| 509 |
// load the object header. |
| 510 |
|
| 511 |
$c->reset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]]); |
| 512 |
|
| 513 |
$header = $this->pdf_read_value($c,null,true); |
| 514 |
|
| 515 |
if ($header[0] != PDF_TYPE_OBJDEC || $header[1] != $obj_spec[1] || $header[2] != $obj_spec[2]) { |
| 516 |
$this->error("Unable to find object ({$obj_spec[1]}, {$obj_spec[2]}) at expected location"); |
| 517 |
} |
| 518 |
|
| 519 |
// If we're being asked to store all the information |
| 520 |
// about the object, we add the object ID and generation |
| 521 |
// number for later use |
| 522 |
$this->actual_obj =& $result; |
| 523 |
if ($encapsulate) { |
| 524 |
$result = array ( |
| 525 |
PDF_TYPE_OBJECT, |
| 526 |
'obj' => $obj_spec[1], |
| 527 |
'gen' => $obj_spec[2] |
| 528 |
); |
| 529 |
} else { |
| 530 |
$result = array(); |
| 531 |
} |
| 532 |
|
| 533 |
// Now simply read the object data until |
| 534 |
// we encounter an end-of-object marker |
| 535 |
while(1) { |
| 536 |
$value = $this->pdf_read_value($c); |
| 537 |
if ($value === false || count($result) > 4) { |
| 538 |
// in this case the parser coudn't find an endobj so we break here |
| 539 |
break; |
| 540 |
} |
| 541 |
|
| 542 |
if ($value[0] == PDF_TYPE_TOKEN && $value[1] === 'endobj') { |
| 543 |
break; |
| 544 |
} |
| 545 |
|
| 546 |
$result[] = $value; |
| 547 |
} |
| 548 |
|
| 549 |
$c->reset($old_pos); |
| 550 |
|
| 551 |
if (isset($result[2][0]) && $result[2][0] == PDF_TYPE_STREAM) { |
| 552 |
$result[0] = PDF_TYPE_STREAM; |
| 553 |
} |
| 554 |
|
| 555 |
return $result; |
| 556 |
} |
| 557 |
} else { |
| 558 |
return $obj_spec; |
| 559 |
} |
| 560 |
} |
| 561 |
|
| 562 |
|
| 563 |
|
| 564 |
/** |
| 565 |
* Reads a token from the file |
| 566 |
* |
| 567 |
* @param object $c pdf_context |
| 568 |
* @return mixed |
| 569 |
*/ |
| 570 |
function pdf_read_token(&$c) |
| 571 |
{ |
| 572 |
// If there is a token available |
| 573 |
// on the stack, pop it out and |
| 574 |
// return it. |
| 575 |
|
| 576 |
if (count($c->stack)) { |
| 577 |
return array_pop($c->stack); |
| 578 |
} |
| 579 |
|
| 580 |
// Strip away any whitespace |
| 581 |
|
| 582 |
do { |
| 583 |
if (!$c->ensure_content()) { |
| 584 |
return false; |
| 585 |
} |
| 586 |
$c->offset += _strspn($c->buffer, " \n\r\t", $c->offset); |
| 587 |
} while ($c->offset >= $c->length - 1); |
| 588 |
|
| 589 |
// Get the first character in the stream |
| 590 |
|
| 591 |
$char = $c->buffer[$c->offset++]; |
| 592 |
|
| 593 |
switch ($char) { |
| 594 |
|
| 595 |
case '[' : |
| 596 |
case ']' : |
| 597 |
case '(' : |
| 598 |
case ')' : |
| 599 |
|
| 600 |
// This is either an array or literal string |
| 601 |
// delimiter, Return it |
| 602 |
|
| 603 |
return $char; |
| 604 |
|
| 605 |
case '<' : |
| 606 |
case '>' : |
| 607 |
|
| 608 |
// This could either be a hex string or |
| 609 |
// dictionary delimiter. Determine the |
| 610 |
// appropriate case and return the token |
| 611 |
|
| 612 |
if ($c->buffer[$c->offset] == $char) { |
| 613 |
if (!$c->ensure_content()) { |
| 614 |
return false; |
| 615 |
} |
| 616 |
$c->offset++; |
| 617 |
return $char . $char; |
| 618 |
} else { |
| 619 |
return $char; |
| 620 |
} |
| 621 |
|
| 622 |
default : |
| 623 |
|
| 624 |
// This is "another" type of token (probably |
| 625 |
// a dictionary entry or a numeric value) |
| 626 |
// Find the end and return it. |
| 627 |
|
| 628 |
if (!$c->ensure_content()) { |
| 629 |
return false; |
| 630 |
} |
| 631 |
|
| 632 |
while(1) { |
| 633 |
|
| 634 |
// Determine the length of the token |
| 635 |
|
| 636 |
$pos = _strcspn($c->buffer, " []<>()\r\n\t/", $c->offset); |
| 637 |
if ($c->offset + $pos <= $c->length - 1) { |
| 638 |
break; |
| 639 |
} else { |
| 640 |
// If the script reaches this point, |
| 641 |
// the token may span beyond the end |
| 642 |
// of the current buffer. Therefore, |
| 643 |
// we increase the size of the buffer |
| 644 |
// and try again--just to be safe. |
| 645 |
|
| 646 |
$c->increase_length(); |
| 647 |
} |
| 648 |
} |
| 649 |
|
| 650 |
$result = substr($c->buffer, $c->offset - 1, $pos + 1); |
| 651 |
|
| 652 |
$c->offset += $pos; |
| 653 |
return $result; |
| 654 |
} |
| 655 |
} |
| 656 |
|
| 657 |
|
| 658 |
} |
| 659 |
|
| 660 |
?> |
