Mfonte\Base62x\Compression\Huffman\Binary\BitStreamWriter

Complexity

Total Complexity

7

Size/Duplication

Total Lines	50
Duplicated Lines	0 %

Importance

Changes	1
Bugs	0	Features	0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	getData()	0	8	2
A	writeString()	0	4	2
A	__construct()	0	3	1
A	writeBit()	0	8	2

<?php

namespace Mfonte\Base62x\Compression\Huffman\Binary;

/**
 *	a mechanism for writing a stream if bits into a string, which can then be easily transmistted or stored.
 */
class BitStreamWriter
{
    private $data = '';
    private $workingByte = null;
    private $cursor = 0;

    /**
     *	initialize be creating our working byte / buffer.
     */
    public function __construct()
    {
        $this->workingByte = new BitArray(8);
    }

    /**
     * 	convert a string of zeroes and ones into a binary representation.
     */
    public function writeString($bitStr)
    {
        for ($i = 0; $i < mb_strlen($bitStr); ++$i) {
            $this->writeBit((bool) $bitStr[$i]);
        }
    }

    /**
     * 	write a bit. 1 if $bit is true.
     */
    public function writeBit($bit)
    {
        $this->workingByte[$this->cursor] = $bit;
        ++$this->cursor;
        if ($this->cursor > 7) {
            $this->data .= $this->workingByte->getData();
            $this->workingByte = new BitArray(8);
            $this->cursor = 0;
        }
    }

    /**
     * 	when the data is accessed, make sure to include any data
     * 	byte in $this->workingByte.
     */
    public function getData()
    {
        $data = $this->data;
        if ($this->cursor > 0) {
            $data .= $this->workingByte->getData();
        }

        return $data;
    }
}