Viewing file:  pdf_context.php (3.43 KB) -rw-r--r--
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<?php
//
// FPDI - Version 1.5.2
//
// Copyright 2004-2014 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.
//
/**
* Class pdf_context
*/
class pdf_context
{
/**
* Mode
*
* @var integer 0 = file | 1 = string
*/
protected $_mode = 0;
/**
* @var resource|string
*/
public $file;
/**
* @var string
*/
public $buffer;
/**
* @var integer
*/
public $offset;
/**
* @var integer
*/
public $length;
/**
* @var array
*/
public $stack;
/**
* The constructor
*
* @param resource $f
*/
public function __construct(&$f)
{
$this->file =& $f;
if (is_string($this->file))
$this->_mode = 1;
$this->reset();
}
/**
* Get the position in the file stream
*
* @return int
*/
public function getPos()
{
if ($this->_mode == 0) {
return ftell($this->file);
} else {
return 0;
}
}
/**
* Reset the position in the file stream.
*
* Optionally move the file pointer to a new location and reset the buffered data.
*
* @param null $pos
* @param int $l
*/
public function reset($pos = null, $l = 100)
{
if ($this->_mode == 0) {
if (!is_null($pos)) {
fseek ($this->file, $pos);
}
$this->buffer = $l > 0 ? fread($this->file, $l) : '';
$this->length = strlen($this->buffer);
if ($this->length < $l)
$this->increaseLength($l - $this->length);
} else {
$this->buffer = $this->file;
$this->length = strlen($this->buffer);
}
$this->offset = 0;
$this->stack = array();
}
/**
* Make sure that there is at least one character beyond the current offset in the buffer.
*
* To prevent the tokenizer from attempting to access data that does not exist.
*
* @return bool
*/
public function ensureContent()
{
if ($this->offset >= $this->length - 1) {
return $this->increaseLength();
} else {
return true;
}
}
/**
* Forcefully read more data into the buffer
*
* @param int $l
* @return bool
*/
public function increaseLength($l = 100)
{
if ($this->_mode == 0 && feof($this->file)) {
return false;
} else if ($this->_mode == 0) {
$totalLength = $this->length + $l;
do {
$toRead = $totalLength - $this->length;
if ($toRead < 1)
break;
$this->buffer .= fread($this->file, $toRead);
} while ((($this->length = strlen($this->buffer)) != $totalLength) && !feof($this->file));
return true;
} else {
return false;
}
}
}
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