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stud/prints/pdf_context.php

@@ -0,0 +1,144 @@
+<?php
+/**
+ * This file is part of FPDI
+ *
+ * @package   FPDI
+ * @copyright Copyright (c) 2015 Setasign - Jan Slabon (http://www.setasign.com)
+ * @license   http://opensource.org/licenses/mit-license The MIT License
+ * @version   1.6.1
+ */
+
+/**
+ * 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;
+        }
+    }
+}