Add a BSD licensed QR code library

resources/qr_code/QRBitBuffer.php

@@ -0,0 +1,107 @@
+<?php
+/**
+ * This file is part of the phpQr package
+ *
+ * See @see QRCode class for description of package and license.
+ */
+
+/**
+ * QRBitBuffer class
+ * 
+ * The purpose of this class is to act as data holder for QRCode.
+ * 
+ * @author Maik Greubel <greubel@nkey.de>
+ * @package phpQr
+ */
+class QRBitBuffer
+{
+  /**
+   * Array based buffer access
+   * 
+   * @var array
+   */
+  private $buffer;
+  
+  /**
+   * Length of array
+   * 
+   * @var int
+   */
+  private $length;
+  
+  /**
+   * Create a new instance of QRBitBuffer
+   */
+  public function __construct()
+  {
+    $this->buffer = array();
+    $this->length = 0;
+  }
+
+  /**
+   * Get particular bit given by index
+   * 
+   * @param int $index The index of bit
+   * @return boolean
+   */
+  public function get($index)
+  {
+    $bufIndex = floor($index / 8);
+    return ( ($this->buffer[$bufIndex] >> (7 - $index % 8) ) & 1) == 1;
+  }
+  
+  /**
+   * Get the byte at particular index
+   * 
+   * @param int $index The index of the byte
+   * @return string
+   */
+  public function getAt($index)
+  {
+    return $this->buffer[$index];
+  }
+  
+  /**
+   * Put amount of bits
+   * @param int $num The data to put
+   * @param int $length The length of data
+   */
+  public function put($num, $length)
+  {
+    for($i = 0; $i < $length; $i++)
+    {
+      $this->putBit((($num >> ($length - $i - 1)) & 1) == 1);
+    }
+  }
+  
+  /**
+   * Get current length in bits
+   * 
+   * @return int The amount of bits
+   */
+  public function getLengthInBits()
+  {
+    return $this->length;
+  }
+  
+  /**
+   * Put particular bit
+   * 
+   * @param int $bit The bit to put
+   */
+  public function putBit($bit)
+  {
+    $bufIndex = floor($this->length / 8);
+    if(sizeof($this->buffer) <= $bufIndex)
+    {
+      array_push($this->buffer, 0);
+    }
+    
+    if($bit)
+    {
+      $this->buffer[$bufIndex] |= (0x80 >> ($this->length % 8));
+    }
+    
+    $this->length++;
+  }
+}