mracine\Helpers\BinaryStringHelper::IntegerToNBOBinaryString()

Complexity

Conditions	5
Paths	6

Size

Total Lines

31

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	12
CRAP Score	5

Importance

Changes

0

<?php
    public static function IntegerToNBOBinaryString(int $value)
    {
        // Initialize an empty string
        $buffer = '';
        // Lets start from the most significant byte
        for ($i=(PHP_INT_SIZE-1); $i>=0; $i--) {
            // Prepare a mask to keep only the most significant byte of $value
            $mask = 0xFF << ($i*8);
            // If the most significant byte is not 0, the final string must contain it
            // If we have already started to construct the string (i.e. there are more signficant digits)
            //   we must set the byte, even if it is a 0.
            //   0xFF00FF, for example, require to set the second byte with a 0 value
            if (($value & $mask) || ''!==$buffer) {
                // Get the curent byte by shifting it to least significant position and add it to the string
                // 0xFF12345678 => 0xFF
                $byte = $value>>(8*$i);
                $buffer .= chr($byte);
                // Set the most significant byte to 0 so we can restart the process being shure
                // that the value is left padded with 0
                // 0xFF12345678 => 0x12345678
                // -1 = 0xFFFFF.... (number of F depend of PHP_INT_SIZE )
                $mask = -1 >> ((PHP_INT_SIZE-$i)*8);
                $value &= $mask;
            }
        }
        // Special case, 0 will not fill the buffer, have to construct it manualy
        if (0==$value) {
            $buffer = chr(0);
        }
        return $buffer;
    }
}