| 1 | <?php
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| 2 | //
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| 3 | // FPDI - Version 1.2
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| 4 | //
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| 5 | // Copyright 2004-2007 Setasign - Jan Slabon
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| 6 | //
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| 7 | // Licensed under the Apache License, Version 2.0 (the "License");
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| 8 | // you may not use this file except in compliance with the License.
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| 9 | // You may obtain a copy of the License at
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| 10 | //
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| 11 | // http://www.apache.org/licenses/LICENSE-2.0
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| 12 | //
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| 13 | // Unless required by applicable law or agreed to in writing, software
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| 14 | // distributed under the License is distributed on an "AS IS" BASIS,
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| 15 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | // See the License for the specific language governing permissions and
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| 17 | // limitations under the License.
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| 18 | //
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| 19 |
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| 20 | if (!defined ('PDF_TYPE_NULL'))
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| 21 | define ('PDF_TYPE_NULL', 0);
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| 22 | if (!defined ('PDF_TYPE_NUMERIC'))
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| 23 | define ('PDF_TYPE_NUMERIC', 1);
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| 24 | if (!defined ('PDF_TYPE_TOKEN'))
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| 25 | define ('PDF_TYPE_TOKEN', 2);
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| 26 | if (!defined ('PDF_TYPE_HEX'))
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| 27 | define ('PDF_TYPE_HEX', 3);
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| 28 | if (!defined ('PDF_TYPE_STRING'))
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| 29 | define ('PDF_TYPE_STRING', 4);
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| 30 | if (!defined ('PDF_TYPE_DICTIONARY'))
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| 31 | define ('PDF_TYPE_DICTIONARY', 5);
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| 32 | if (!defined ('PDF_TYPE_ARRAY'))
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| 33 | define ('PDF_TYPE_ARRAY', 6);
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| 34 | if (!defined ('PDF_TYPE_OBJDEC'))
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| 35 | define ('PDF_TYPE_OBJDEC', 7);
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| 36 | if (!defined ('PDF_TYPE_OBJREF'))
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| 37 | define ('PDF_TYPE_OBJREF', 8);
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| 38 | if (!defined ('PDF_TYPE_OBJECT'))
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| 39 | define ('PDF_TYPE_OBJECT', 9);
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| 40 | if (!defined ('PDF_TYPE_STREAM'))
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| 41 | define ('PDF_TYPE_STREAM', 10);
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| 42 |
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| 43 | require_once("pdf_context.php");
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| 44 | require_once("wrapper_functions.php");
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| 45 |
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| 46 | class pdf_parser {
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| 47 |
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| 48 | /**
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| 49 | * Filename
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| 50 | * @var string
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| 51 | */
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| 52 | var $filename;
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| 53 |
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| 54 | /**
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| 55 | * File resource
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| 56 | * @var resource
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| 57 | */
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| 58 | var $f;
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| 59 |
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| 60 | /**
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| 61 | * PDF Context
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| 62 | * @var object pdf_context-Instance
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| 63 | */
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| 64 | var $c;
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| 65 |
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| 66 | /**
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| 67 | * xref-Data
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| 68 | * @var array
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| 69 | */
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| 70 | var $xref;
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| 71 |
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| 72 | /**
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| 73 | * root-Object
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| 74 | * @var array
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| 75 | */
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| 76 | var $root;
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| 77 |
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| 78 |
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| 79 | /**
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| 80 | * Constructor
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| 81 | *
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| 82 | * @param string $filename Source-Filename
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| 83 | */
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| 84 | function pdf_parser($filename) {
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| 85 | $this->filename = $filename;
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| 86 |
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| 87 | $this->f = @fopen($this->filename, "rb");
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| 88 |
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| 89 | if (!$this->f)
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| 90 | $this->error(sprintf("Cannot open %s !", $filename));
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| 91 |
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| 92 | $this->getPDFVersion();
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| 93 |
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| 94 | $this->c =& new pdf_context($this->f);
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| 95 | // Read xref-Data
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| 96 | $this->pdf_read_xref($this->xref, $this->pdf_find_xref());
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| 97 |
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| 98 | // Check for Encryption
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| 99 | $this->getEncryption();
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| 100 |
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| 101 | // Read root
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| 102 | $this->pdf_read_root();
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| 103 | }
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| 104 |
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| 105 | /**
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| 106 | * Close the opened file
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| 107 | */
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| 108 | function closeFile() {
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| 109 | if (isset($this->f)) {
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| 110 | fclose($this->f);
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| 111 | unset($this->f);
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | /**
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| 116 | * Print Error and die
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| 117 | *
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| 118 | * @param string $msg Error-Message
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| 119 | */
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| 120 | function error($msg) {
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| 121 | die("<b>PDF-Parser Error:</b> ".$msg);
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| 122 | }
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| 123 |
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| 124 | /**
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| 125 | * Check Trailer for Encryption
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| 126 | */
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| 127 | function getEncryption() {
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| 128 | if (isset($this->xref['trailer'][1]['/Encrypt'])) {
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| 129 | $this->error("File is encrypted!");
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| 130 | }
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| 131 | }
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| 132 |
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| 133 | /**
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| 134 | * Find/Return /Root
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| 135 | *
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| 136 | * @return array
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| 137 | */
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| 138 | function pdf_find_root() {
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| 139 | if ($this->xref['trailer'][1]['/Root'][0] != PDF_TYPE_OBJREF) {
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| 140 | $this->error("Wrong Type of Root-Element! Must be an indirect reference");
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| 141 | }
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| 142 | return $this->xref['trailer'][1]['/Root'];
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| 143 | }
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| 144 |
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| 145 | /**
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| 146 | * Read the /Root
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| 147 | */
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| 148 | function pdf_read_root() {
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| 149 | // read root
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| 150 | $this->root = $this->pdf_resolve_object($this->c, $this->pdf_find_root());
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| 151 | }
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| 152 |
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| 153 | /**
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| 154 | * Get PDF-Version
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| 155 | *
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| 156 | * And reset the PDF Version used in FPDI if needed
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| 157 | */
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| 158 | function getPDFVersion() {
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| 159 | fseek($this->f, 0);
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| 160 | preg_match("/\d\.\d/",fread($this->f,16),$m);
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| 161 | $this->pdfVersion = $m[0];
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| 162 | }
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| 163 |
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| 164 | /**
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| 165 | * Find the xref-Table
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| 166 | */
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| 167 | function pdf_find_xref() {
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| 168 | fseek ($this->f, -min(filesize($this->filename),1500), SEEK_END);
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| 169 | $data = fread($this->f, 1500);
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| 170 |
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| 171 | $pos = strlen($data) - strpos(strrev($data), strrev('startxref'));
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| 172 | $data = substr($data, $pos);
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| 173 |
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| 174 | if (!preg_match('/\s*(\d+).*$/s', $data, $matches)) {
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| 175 | $this->error("Unable to find pointer to xref table");
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| 176 | }
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| 177 |
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| 178 | return (int) $matches[1];
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| 179 | }
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| 180 |
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| 181 | /**
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| 182 | * Read xref-table
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| 183 | *
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| 184 | * @param array $result Array of xref-table
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| 185 | * @param integer $offset of xref-table
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| 186 | * @param integer $start start-position in xref-table
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| 187 | * @param integer $end end-position in xref-table
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| 188 | */
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| 189 | function pdf_read_xref(&$result, $offset, $start = null, $end = null) {
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| 190 | if (is_null ($start) || is_null ($end)) {
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| 191 | fseek($this->f, $o_pos = $offset);
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| 192 | $data = trim(fgets($this->f,1024));
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| 193 |
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| 194 | if (strlen($data) == 0)
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| 195 | $data = trim(fgets($this->f,1024));
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| 196 |
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| 197 | if ($data !== 'xref') {
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| 198 | fseek($this->f, $o_pos);
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| 199 | $data = trim(_fgets($this->f, true));
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| 200 | if ($data !== 'xref') {
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| 201 | if (preg_match('/(.*xref)(.*)/m', $data, $m)) { // xref 0 128 - in one line
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| 202 | fseek($this->f, $o_pos+strlen($m[1]));
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| 203 | } elseif (preg_match('/(x|r|e|f)+/', $data, $m)) { // correct invalid xref-pointer
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| 204 | $tmpOffset = $offset-4+strlen($m[0]);
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| 205 | $this->pdf_read_xref($result, $tmpOffset, $start, $end);
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| 206 | return;
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| 207 | } else {
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| 208 | $this->error("Unable to find xref table - Maybe a Problem with 'auto_detect_line_endings'");
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| 209 | }
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| 210 | }
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| 211 | }
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| 212 |
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| 213 | $o_pos = ftell($this->f);
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| 214 | $data = explode(' ', trim(fgets($this->f,1024)));
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| 215 | if (count($data) != 2) {
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| 216 | fseek($this->f, $o_pos);
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| 217 | $data = explode(' ', trim(_fgets($this->f, true)));
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| 218 |
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| 219 | if (count($data) != 2) {
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| 220 | if (count($data) > 2) { // no lineending
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| 221 | $n_pos = $o_pos+strlen($data[0])+strlen($data[1])+2;
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| 222 | fseek($this->f, $n_pos);
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| 223 | } else {
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| 224 | $this->error("Unexpected header in xref table");
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| 225 | }
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| 226 | }
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| 227 | }
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| 228 | $start = $data[0];
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| 229 | $end = $start + $data[1];
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| 230 | }
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| 231 |
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| 232 | if (!isset($result['xref_location'])) {
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| 233 | $result['xref_location'] = $offset;
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| 234 | }
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| 235 |
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| 236 | if (!isset($result['max_object']) || $end > $result['max_object']) {
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| 237 | $result['max_object'] = $end;
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| 238 | }
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| 239 |
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| 240 | for (; $start < $end; $start++) {
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| 241 | $data = ltrim(fread($this->f, 20)); // Spezifications says: 20 bytes including newlines
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| 242 | $offset = substr($data, 0, 10);
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| 243 | $generation = substr($data, 11, 5);
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| 244 |
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| 245 | if (!isset ($result['xref'][$start][(int) $generation])) {
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| 246 | $result['xref'][$start][(int) $generation] = (int) $offset;
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| 247 | }
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| 248 | }
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| 249 |
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| 250 | $o_pos = ftell($this->f);
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| 251 | $data = fgets($this->f,1024);
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| 252 | if (strlen(trim($data)) == 0)
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| 253 | $data = fgets($this->f, 1024);
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| 254 |
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| 255 | if (preg_match("/trailer/",$data)) {
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| 256 | if (preg_match("/(.*trailer[ \n\r]*)/",$data,$m)) {
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| 257 | fseek($this->f, $o_pos+strlen($m[1]));
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| 258 | }
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| 259 |
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| 260 | $c =& new pdf_context($this->f);
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| 261 | $trailer = $this->pdf_read_value($c);
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| 262 |
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| 263 | if (isset($trailer[1]['/Prev'])) {
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| 264 | $this->pdf_read_xref($result, $trailer[1]['/Prev'][1]);
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| 265 | $result['trailer'][1] = array_merge($result['trailer'][1], $trailer[1]);
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| 266 | } else {
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| 267 | $result['trailer'] = $trailer;
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| 268 | }
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| 269 | } else {
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| 270 | $data = explode(' ', trim($data));
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| 271 |
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| 272 | if (count($data) != 2) {
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| 273 | fseek($this->f, $o_pos);
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| 274 | $data = explode(' ', trim (_fgets ($this->f, true)));
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| 275 |
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| 276 | if (count($data) != 2) {
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| 277 | $this->error("Unexpected data in xref table");
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| 278 | }
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| 279 | }
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| 280 |
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| 281 | $this->pdf_read_xref($result, null, (int) $data[0], (int) $data[0] + (int) $data[1]);
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| 282 | }
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| 283 | }
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| 284 |
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| 285 |
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| 286 | /**
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| 287 | * Reads an Value
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| 288 | *
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| 289 | * @param object $c pdf_context
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| 290 | * @param string $token a Token
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| 291 | * @return mixed
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| 292 | */
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| 293 | function pdf_read_value(&$c, $token = null) {
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| 294 | if (is_null($token)) {
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| 295 | $token = $this->pdf_read_token($c);
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| 296 | }
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| 297 |
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| 298 | if ($token === false) {
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| 299 | return false;
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| 300 | }
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| 301 |
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| 302 | switch ($token) {
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| 303 | case '<':
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| 304 | // This is a hex string.
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| 305 | // Read the value, then the terminator
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| 306 |
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| 307 | $pos = $c->offset;
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| 308 |
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| 309 | while(1) {
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| 310 |
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| 311 | $match = strpos ($c->buffer, '>', $pos);
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| 312 |
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| 313 | // If you can't find it, try
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| 314 | // reading more data from the stream
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| 315 |
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| 316 | if ($match === false) {
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| 317 | if (!$c->increase_length()) {
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| 318 | return false;
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| 319 | } else {
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| 320 | continue;
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| 321 | }
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| 322 | }
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| 323 |
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| 324 | $result = substr ($c->buffer, $c->offset, $match - $c->offset);
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| 325 | $c->offset = $match+1;
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| 326 |
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| 327 | return array (PDF_TYPE_HEX, $result);
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| 328 | }
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| 329 |
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| 330 | break;
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| 331 | case '<<':
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| 332 | // This is a dictionary.
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| 333 |
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| 334 | $result = array();
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| 335 |
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| 336 | // Recurse into this function until we reach
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| 337 | // the end of the dictionary.
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| 338 | while (($key = $this->pdf_read_token($c)) !== '>>') {
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| 339 | if ($key === false) {
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| 340 | return false;
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| 341 | }
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| 342 |
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| 343 | if (($value = $this->pdf_read_value($c)) === false) {
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| 344 | return false;
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| 345 | }
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| 346 | $result[$key] = $value;
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| 347 | }
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| 348 |
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| 349 | return array (PDF_TYPE_DICTIONARY, $result);
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| 350 |
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| 351 | case '[':
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| 352 | // This is an array.
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| 353 |
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| 354 | $result = array();
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| 355 |
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| 356 | // Recurse into this function until we reach
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| 357 | // the end of the array.
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| 358 | while (($token = $this->pdf_read_token($c)) !== ']') {
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| 359 | if ($token === false) {
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| 360 | return false;
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| 361 | }
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| 362 |
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| 363 | if (($value = $this->pdf_read_value($c, $token)) === false) {
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| 364 | return false;
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| 365 | }
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| 366 |
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| 367 | $result[] = $value;
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| 368 | }
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| 369 |
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| 370 | return array (PDF_TYPE_ARRAY, $result);
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| 371 |
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| 372 | case '(' :
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| 373 | // This is a string
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| 374 |
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| 375 | $pos = $c->offset;
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| 376 |
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| 377 | while(1) {
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| 378 |
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| 379 | // Start by finding the next closed
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| 380 | // parenthesis
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| 381 |
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| 382 | $match = strpos ($c->buffer, ')', $pos);
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| 383 |
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| 384 | // If you can't find it, try
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| 385 | // reading more data from the stream
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| 386 |
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| 387 | if ($match === false) {
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| 388 | if (!$c->increase_length()) {
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| 389 | return false;
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| 390 | } else {
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| 391 | continue;
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| 392 | }
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| 393 | }
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| 394 |
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| 395 | // Make sure that there is no backslash
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| 396 | // before the parenthesis. If there is,
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| 397 | // move on. Otherwise, return the string.
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| 398 | $esc = preg_match('/([\\\\]+)$/', $tmpresult = substr($c->buffer, $c->offset, $match - $c->offset), $m);
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| 399 |
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| 400 | if ($esc === 0 || strlen($m[1]) % 2 == 0) {
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| 401 | $result = $tmpresult;
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| 402 | $c->offset = $match + 1;
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| 403 | return array (PDF_TYPE_STRING, $result);
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| 404 | } else {
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| 405 | $pos = $match + 1;
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| 406 |
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| 407 | if ($pos > $c->offset + $c->length) {
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| 408 | $c->increase_length();
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| 409 | }
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| 410 | }
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| 411 | }
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| 412 |
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| 413 | case "stream":
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| 414 | $o_pos = ftell($c->file)-strlen($c->buffer);
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| 415 | $o_offset = $c->offset;
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| 416 |
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| 417 | $c->reset($startpos = $o_pos + $o_offset);
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| 418 |
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| 419 | $e = 0; // ensure line breaks in front of the stream
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| 420 | if ($c->buffer[0] == chr(10) || $c->buffer[0] == chr(13))
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| 421 | $e++;
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| 422 | if ($c->buffer[1] == chr(10) && $c->buffer[0] != chr(10))
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| 423 | $e++;
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| 424 |
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| 425 | if ($this->actual_obj[1][1]['/Length'][0] == PDF_TYPE_OBJREF) {
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| 426 | $tmp_c =& new pdf_context($this->f);
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| 427 | $tmp_length = $this->pdf_resolve_object($tmp_c,$this->actual_obj[1][1]['/Length']);
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| 428 | $length = $tmp_length[1][1];
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| 429 | } else {
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| 430 | $length = $this->actual_obj[1][1]['/Length'][1];
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| 431 | }
|
|---|
| 432 |
|
|---|
| 433 | if ($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 | ?> |
|---|