<?php

namespace LWVendor\PhpOffice\PhpSpreadsheet\Reader\Xls;

class MD5
{
    /**
     * @var int
     */
    private $a;
    /**
     * @var int
     */
    private $b;
    /**
     * @var int
     */
    private $c;
    /**
     * @var int
     */
    private $d;
    /**
     * @var int
     */
    private static $allOneBits;
    /**
     * MD5 stream constructor.
     */
    public function __construct()
    {
        self::$allOneBits = self::signedInt(0xffffffff);
        $this->reset();
    }
    /**
     * Reset the MD5 stream context.
     */
    public function reset() : void
    {
        $this->a = 0x67452301;
        $this->b = self::signedInt(0xefcdab89);
        $this->c = self::signedInt(0x98badcfe);
        $this->d = 0x10325476;
    }
    /**
     * Get MD5 stream context.
     *
     * @return string
     */
    public function getContext()
    {
        $s = '';
        foreach (['a', 'b', 'c', 'd'] as $i) {
            $v = $this->{$i};
            $s .= \chr($v & 0xff);
            $s .= \chr($v >> 8 & 0xff);
            $s .= \chr($v >> 16 & 0xff);
            $s .= \chr($v >> 24 & 0xff);
        }
        return $s;
    }
    /**
     * Add data to context.
     *
     * @param string $data Data to add
     */
    public function add(string $data) : void
    {
        // @phpstan-ignore-next-line
        $words = \array_values(\unpack('V16', $data));
        $A = $this->a;
        $B = $this->b;
        $C = $this->c;
        $D = $this->d;
        $F = [self::class, 'f'];
        $G = [self::class, 'g'];
        $H = [self::class, 'h'];
        $I = [self::class, 'i'];
        // ROUND 1
        self::step($F, $A, $B, $C, $D, $words[0], 7, 0xd76aa478);
        self::step($F, $D, $A, $B, $C, $words[1], 12, 0xe8c7b756);
        self::step($F, $C, $D, $A, $B, $words[2], 17, 0x242070db);
        self::step($F, $B, $C, $D, $A, $words[3], 22, 0xc1bdceee);
        self::step($F, $A, $B, $C, $D, $words[4], 7, 0xf57c0faf);
        self::step($F, $D, $A, $B, $C, $words[5], 12, 0x4787c62a);
        self::step($F, $C, $D, $A, $B, $words[6], 17, 0xa8304613);
        self::step($F, $B, $C, $D, $A, $words[7], 22, 0xfd469501);
        self::step($F, $A, $B, $C, $D, $words[8], 7, 0x698098d8);
        self::step($F, $D, $A, $B, $C, $words[9], 12, 0x8b44f7af);
        self::step($F, $C, $D, $A, $B, $words[10], 17, 0xffff5bb1);
        self::step($F, $B, $C, $D, $A, $words[11], 22, 0x895cd7be);
        self::step($F, $A, $B, $C, $D, $words[12], 7, 0x6b901122);
        self::step($F, $D, $A, $B, $C, $words[13], 12, 0xfd987193);
        self::step($F, $C, $D, $A, $B, $words[14], 17, 0xa679438e);
        self::step($F, $B, $C, $D, $A, $words[15], 22, 0x49b40821);
        // ROUND 2
        self::step($G, $A, $B, $C, $D, $words[1], 5, 0xf61e2562);
        self::step($G, $D, $A, $B, $C, $words[6], 9, 0xc040b340);
        self::step($G, $C, $D, $A, $B, $words[11], 14, 0x265e5a51);
        self::step($G, $B, $C, $D, $A, $words[0], 20, 0xe9b6c7aa);
        self::step($G, $A, $B, $C, $D, $words[5], 5, 0xd62f105d);
        self::step($G, $D, $A, $B, $C, $words[10], 9, 0x2441453);
        self::step($G, $C, $D, $A, $B, $words[15], 14, 0xd8a1e681);
        self::step($G, $B, $C, $D, $A, $words[4], 20, 0xe7d3fbc8);
        self::step($G, $A, $B, $C, $D, $words[9], 5, 0x21e1cde6);
        self::step($G, $D, $A, $B, $C, $words[14], 9, 0xc33707d6);
        self::step($G, $C, $D, $A, $B, $words[3], 14, 0xf4d50d87);
        self::step($G, $B, $C, $D, $A, $words[8], 20, 0x455a14ed);
        self::step($G, $A, $B, $C, $D, $words[13], 5, 0xa9e3e905);
        self::step($G, $D, $A, $B, $C, $words[2], 9, 0xfcefa3f8);
        self::step($G, $C, $D, $A, $B, $words[7], 14, 0x676f02d9);
        self::step($G, $B, $C, $D, $A, $words[12], 20, 0x8d2a4c8a);
        // ROUND 3
        self::step($H, $A, $B, $C, $D, $words[5], 4, 0xfffa3942);
        self::step($H, $D, $A, $B, $C, $words[8], 11, 0x8771f681);
        self::step($H, $C, $D, $A, $B, $words[11], 16, 0x6d9d6122);
        self::step($H, $B, $C, $D, $A, $words[14], 23, 0xfde5380c);
        self::step($H, $A, $B, $C, $D, $words[1], 4, 0xa4beea44);
        self::step($H, $D, $A, $B, $C, $words[4], 11, 0x4bdecfa9);
        self::step($H, $C, $D, $A, $B, $words[7], 16, 0xf6bb4b60);
        self::step($H, $B, $C, $D, $A, $words[10], 23, 0xbebfbc70);
        self::step($H, $A, $B, $C, $D, $words[13], 4, 0x289b7ec6);
        self::step($H, $D, $A, $B, $C, $words[0], 11, 0xeaa127fa);
        self::step($H, $C, $D, $A, $B, $words[3], 16, 0xd4ef3085);
        self::step($H, $B, $C, $D, $A, $words[6], 23, 0x4881d05);
        self::step($H, $A, $B, $C, $D, $words[9], 4, 0xd9d4d039);
        self::step($H, $D, $A, $B, $C, $words[12], 11, 0xe6db99e5);
        self::step($H, $C, $D, $A, $B, $words[15], 16, 0x1fa27cf8);
        self::step($H, $B, $C, $D, $A, $words[2], 23, 0xc4ac5665);
        // ROUND 4
        self::step($I, $A, $B, $C, $D, $words[0], 6, 0xf4292244);
        self::step($I, $D, $A, $B, $C, $words[7], 10, 0x432aff97);
        self::step($I, $C, $D, $A, $B, $words[14], 15, 0xab9423a7);
        self::step($I, $B, $C, $D, $A, $words[5], 21, 0xfc93a039);
        self::step($I, $A, $B, $C, $D, $words[12], 6, 0x655b59c3);
        self::step($I, $D, $A, $B, $C, $words[3], 10, 0x8f0ccc92);
        self::step($I, $C, $D, $A, $B, $words[10], 15, 0xffeff47d);
        self::step($I, $B, $C, $D, $A, $words[1], 21, 0x85845dd1);
        self::step($I, $A, $B, $C, $D, $words[8], 6, 0x6fa87e4f);
        self::step($I, $D, $A, $B, $C, $words[15], 10, 0xfe2ce6e0);
        self::step($I, $C, $D, $A, $B, $words[6], 15, 0xa3014314);
        self::step($I, $B, $C, $D, $A, $words[13], 21, 0x4e0811a1);
        self::step($I, $A, $B, $C, $D, $words[4], 6, 0xf7537e82);
        self::step($I, $D, $A, $B, $C, $words[11], 10, 0xbd3af235);
        self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
        self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
        $this->a = $this->a + $A & self::$allOneBits;
        $this->b = $this->b + $B & self::$allOneBits;
        $this->c = $this->c + $C & self::$allOneBits;
        $this->d = $this->d + $D & self::$allOneBits;
    }
    private static function f(int $X, int $Y, int $Z) : int
    {
        return $X & $Y | ~$X & $Z;
        // X AND Y OR NOT X AND Z
    }
    private static function g(int $X, int $Y, int $Z) : int
    {
        return $X & $Z | $Y & ~$Z;
        // X AND Z OR Y AND NOT Z
    }
    private static function h(int $X, int $Y, int $Z) : int
    {
        return $X ^ $Y ^ $Z;
        // X XOR Y XOR Z
    }
    private static function i(int $X, int $Y, int $Z) : int
    {
        return $Y ^ ($X | ~$Z);
        // Y XOR (X OR NOT Z)
    }
    /** @param float|int $t may be float on 32-bit system */
    private static function step(callable $func, int &$A, int $B, int $C, int $D, int $M, int $s, $t) : void
    {
        $t = self::signedInt($t);
        $A = (int) ($A + \call_user_func($func, $B, $C, $D) + $M + $t) & self::$allOneBits;
        $A = self::rotate($A, $s);
        $A = (int) ($B + $A) & self::$allOneBits;
    }
    /** @param float|int $result may be float on 32-bit system */
    private static function signedInt($result) : int
    {
        return \is_int($result) ? $result : (int) (\PHP_INT_MIN + $result - 1 - \PHP_INT_MAX);
    }
    private static function rotate(int $decimal, int $bits) : int
    {
        $binary = \str_pad(\decbin($decimal), 32, '0', \STR_PAD_LEFT);
        return self::signedInt(\bindec(\substr($binary, $bits) . \substr($binary, 0, $bits)));
    }
}