151 lines
3.2 KiB
PHP
151 lines
3.2 KiB
PHP
<?php
|
|
/**
|
|
* This file is part of FPDI
|
|
*
|
|
* @package FPDI
|
|
* @copyright Copyright (c) 2017 Setasign - Jan Slabon (https://www.setasign.com)
|
|
* @license http://opensource.org/licenses/mit-license The MIT License
|
|
* @version 1.6.2
|
|
*/
|
|
|
|
/**
|
|
* 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) {
|
|
if (feof($this->file)) {
|
|
$stat = fstat($this->file);
|
|
fseek($this->file, $stat['size']);
|
|
}
|
|
|
|
$pos = ftell($this->file);
|
|
|
|
return $pos;
|
|
} 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;
|
|
}
|
|
}
|
|
} |