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151 lines
3.3 KiB
151 lines
3.3 KiB
<?php
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/**
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* This file is part of FPDI
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*
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* @package FPDI
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* @copyright Copyright (c) 2017 Setasign - Jan Slabon (https://www.setasign.com)
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* @license http://opensource.org/licenses/mit-license The MIT License
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* @version 1.6.2
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*/
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/**
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* Class pdf_context
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*/
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class pdf_context
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{
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/**
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* Mode
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*
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* @var integer 0 = file | 1 = string
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*/
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protected $_mode = 0;
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/**
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* @var resource|string
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*/
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public $file;
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/**
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* @var string
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*/
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public $buffer;
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/**
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* @var integer
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*/
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public $offset;
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/**
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* @var integer
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*/
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public $length;
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/**
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* @var array
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*/
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public $stack;
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/**
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* The constructor
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*
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* @param resource $f
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*/
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public function __construct(&$f)
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{
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$this->file =& $f;
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if (is_string($this->file))
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$this->_mode = 1;
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$this->reset();
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}
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/**
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* Get the position in the file stream
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*
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* @return int
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*/
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public function getPos()
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{
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if ($this->_mode == 0) {
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if (feof($this->file)) {
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$stat = fstat($this->file);
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fseek($this->file, $stat['size']);
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}
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$pos = ftell($this->file);
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return $pos;
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} else {
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return 0;
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}
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}
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/**
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* Reset the position in the file stream.
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*
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* Optionally move the file pointer to a new location and reset the buffered data.
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*
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* @param null $pos
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* @param int $l
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*/
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public function reset($pos = null, $l = 100)
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{
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if ($this->_mode == 0) {
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if (!is_null($pos)) {
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fseek($this->file, $pos);
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}
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$this->buffer = $l > 0 ? fread($this->file, $l) : '';
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$this->length = strlen($this->buffer);
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if ($this->length < $l)
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$this->increaseLength($l - $this->length);
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} else {
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$this->buffer = $this->file;
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$this->length = strlen($this->buffer);
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}
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$this->offset = 0;
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$this->stack = array();
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}
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/**
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* Make sure that there is at least one character beyond the current offset in the buffer.
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*
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* To prevent the tokenizer from attempting to access data that does not exist.
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*
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* @return bool
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*/
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public function ensureContent()
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{
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if ($this->offset >= $this->length - 1) {
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return $this->increaseLength();
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} else {
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return true;
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}
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}
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/**
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* Forcefully read more data into the buffer
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*
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* @param int $l
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* @return bool
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*/
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public function increaseLength($l = 100)
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{
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if ($this->_mode == 0 && feof($this->file)) {
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return false;
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} else if ($this->_mode == 0) {
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$totalLength = $this->length + $l;
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do {
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$toRead = $totalLength - $this->length;
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if ($toRead < 1)
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break;
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$this->buffer .= fread($this->file, $toRead);
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} while ((($this->length = strlen($this->buffer)) != $totalLength) && !feof($this->file));
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return true;
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} else {
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return false;
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}
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}
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}
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