:octocat: move BitBuffer to Common

src/Common/BitBuffer.php

@@ -0,0 +1,89 @@
+<?php
+/**
+ * Class BitBuffer
+ *
+ * @filesource   BitBuffer.php
+ * @created      25.11.2015
+ * @package      chillerlan\QRCode\Common
+ * @author       Smiley <smiley@chillerlan.net>
+ * @copyright    2015 Smiley
+ * @license      MIT
+ */
+
+namespace chillerlan\QRCode\Common;
+
+use function count, floor;
+
+/**
+ * Holds the raw binary data
+ */
+final class BitBuffer{
+
+	/**
+	 * The buffer content
+	 *
+	 * @var int[]
+	 */
+	protected array $buffer = [];
+
+	/**
+	 * Length of the content (bits)
+	 */
+	protected int $length = 0;
+
+	/**
+	 * clears the buffer
+	 */
+	public function clear():BitBuffer{
+		$this->buffer = [];
+		$this->length = 0;
+
+		return $this;
+	}
+
+	/**
+	 * appends a sequence of bits
+	 */
+	public function put(int $num, int $length):BitBuffer{
+
+		for($i = 0; $i < $length; $i++){
+			$this->putBit((($num >> ($length - $i - 1)) & 1) === 1);
+		}
+
+		return $this;
+	}
+
+	/**
+	 * appends a single bit
+	 */
+	public function putBit(bool $bit):BitBuffer{
+		$bufIndex = floor($this->length / 8);
+
+		if(count($this->buffer) <= $bufIndex){
+			$this->buffer[] = 0;
+		}
+
+		if($bit === true){
+			$this->buffer[(int)$bufIndex] |= (0x80 >> ($this->length % 8));
+		}
+
+		$this->length++;
+
+		return $this;
+	}
+
+	/**
+	 * returns the current buffer length
+	 */
+	public function getLength():int{
+		return $this->length;
+	}
+
+	/**
+	 * returns the buffer content
+	 */
+	public function getBuffer():array{
+		return $this->buffer;
+	}
+
+}