crm.fsf.org/20131203/files/sites/all/modules-old/civicrm/packages/FPDI/pdf_context.php

   1 <?php
   2 //
   3 //  FPDI - Version 1.5
   4 //
   5 //    Copyright 2004-2014 Setasign - Jan Slabon
   6 //
   7 //  Licensed under the Apache License, Version 2.0 (the "License");
   8 //  you may not use this file except in compliance with the License.
   9 //  You may obtain a copy of the License at
  10 //
  11 //      http://www.apache.org/licenses/LICENSE-2.0
  12 //
  13 //  Unless required by applicable law or agreed to in writing, software
  14 //  distributed under the License is distributed on an "AS IS" BASIS,
  15 //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16 //  See the License for the specific language governing permissions and
  17 //  limitations under the License.
  18 //
  19
  20 /**
  21  * Class pdf_context
  22  */
  23 class pdf_context
  24 {
  25     /**
  26      * Mode
  27      *
  28      * @var integer 0 = file | 1 = string
  29      */
  30     protected $_mode = 0;
  31
  32     /**
  33      * @var resource|string
  34      */
  35     public $file;
  36
  37     /**
  38      * @var string
  39      */
  40     public $buffer;
  41
  42     /**
  43      * @var integer
  44      */
  45     public $offset;
  46
  47     /**
  48      * @var integer
  49      */
  50     public $length;
  51
  52     /**
  53      * @var array
  54      */
  55     public $stack;
  56
  57     /**
  58      * The constructor
  59      *
  60      * @param resource $f
  61      */
  62     public function __construct(&$f)
  63     {
  64         $this->file =& $f;
  65         if (is_string($this->file))
  66             $this->_mode = 1;
  67
  68         $this->reset();
  69     }
  70
  71     /**
  72      * Get the position in the file stream
  73      *
  74      * @return int
  75      */
  76     public function getPos()
  77     {
  78         if ($this->_mode == 0) {
  79             return ftell($this->file);
  80         } else {
  81             return 0;
  82         }
  83     }
  84
  85     /**
  86      * Reset the position in the file stream.
  87      *
  88      * Optionally move the file pointer to a new location and reset the buffered data.
  89      *
  90      * @param null $pos
  91      * @param int $l
  92      */
  93     public function reset($pos = null, $l = 100)
  94     {
  95         if ($this->_mode == 0) {
  96             if (!is_null($pos)) {
  97                 fseek ($this->file, $pos);
  98             }
  99
 100             $this->buffer = $l > 0 ? fread($this->file, $l) : '';
 101             $this->length = strlen($this->buffer);
 102             if ($this->length < $l)
 103                 $this->increaseLength($l - $this->length);
 104         } else {
 105             $this->buffer = $this->file;
 106             $this->length = strlen($this->buffer);
 107         }
 108         $this->offset = 0;
 109         $this->stack = array();
 110     }
 111
 112     /**
 113      * Make sure that there is at least one character beyond the current offset in the buffer.
 114      *
 115      * To prevent the tokenizer from attempting to access data that does not exist.
 116      *
 117      * @return bool
 118      */
 119     public function ensureContent()
 120     {
 121         if ($this->offset >= $this->length - 1) {
 122             return $this->increaseLength();
 123         } else {
 124             return true;
 125         }
 126     }
 127
 128     /**
 129      * Forcefully read more data into the buffer
 130      *
 131      * @param int $l
 132      * @return bool
 133      */
 134     public function increaseLength($l = 100)
 135     {
 136         if ($this->_mode == 0 && feof($this->file)) {
 137             return false;
 138         } else if ($this->_mode == 0) {
 139             $totalLength = $this->length + $l;
 140             do {
 141                 $toRead = $totalLength - $this->length;
 142                 if ($toRead < 1)
 143                     break;
 144
 145                 $this->buffer .= fread($this->file, $toRead);
 146             } while ((($this->length = strlen($this->buffer)) != $totalLength) && !feof($this->file));
 147
 148             return true;
 149         } else {
 150             return false;
 151         }
 152     }
 153 }