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BinaryUtil.php
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BinaryUtil.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Uid;
/**
* @internal
*
* @author Nicolas Grekas <p@tchwork.com>
*/
class BinaryUtil
{
public const BASE10 = [
'' => '0123456789',
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
];
public const BASE58 = [
'' => '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz',
1 => 0, 1, 2, 3, 4, 5, 6, 7, 8, 'A' => 9,
'B' => 10, 'C' => 11, 'D' => 12, 'E' => 13, 'F' => 14, 'G' => 15,
'H' => 16, 'J' => 17, 'K' => 18, 'L' => 19, 'M' => 20, 'N' => 21,
'P' => 22, 'Q' => 23, 'R' => 24, 'S' => 25, 'T' => 26, 'U' => 27,
'V' => 28, 'W' => 29, 'X' => 30, 'Y' => 31, 'Z' => 32, 'a' => 33,
'b' => 34, 'c' => 35, 'd' => 36, 'e' => 37, 'f' => 38, 'g' => 39,
'h' => 40, 'i' => 41, 'j' => 42, 'k' => 43, 'm' => 44, 'n' => 45,
'o' => 46, 'p' => 47, 'q' => 48, 'r' => 49, 's' => 50, 't' => 51,
'u' => 52, 'v' => 53, 'w' => 54, 'x' => 55, 'y' => 56, 'z' => 57,
];
// https://tools.ietf.org/html/rfc4122#section-4.1.4
// 0x01b21dd213814000 is the number of 100-ns intervals between the
// UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
private const TIME_OFFSET_INT = 0x01B21DD213814000;
private const TIME_OFFSET_BIN = "\x01\xb2\x1d\xd2\x13\x81\x40\x00";
private const TIME_OFFSET_COM1 = "\xfe\x4d\xe2\x2d\xec\x7e\xbf\xff";
private const TIME_OFFSET_COM2 = "\xfe\x4d\xe2\x2d\xec\x7e\xc0\x00";
public static function toBase(string $bytes, array $map): string
{
$base = \strlen($alphabet = $map['']);
$bytes = array_values(unpack(\PHP_INT_SIZE >= 8 ? 'n*' : 'C*', $bytes));
$digits = '';
while ($count = \count($bytes)) {
$quotient = [];
$remainder = 0;
for ($i = 0; $i !== $count; ++$i) {
$carry = $bytes[$i] + ($remainder << (\PHP_INT_SIZE >= 8 ? 16 : 8));
$digit = intdiv($carry, $base);
$remainder = $carry % $base;
if ($digit || $quotient) {
$quotient[] = $digit;
}
}
$digits = $alphabet[$remainder].$digits;
$bytes = $quotient;
}
return $digits;
}
public static function fromBase(string $digits, array $map): string
{
$base = \strlen($map['']);
$count = \strlen($digits);
$bytes = [];
while ($count) {
$quotient = [];
$remainder = 0;
for ($i = 0; $i !== $count; ++$i) {
$carry = ($bytes ? $digits[$i] : $map[$digits[$i]]) + $remainder * $base;
if (\PHP_INT_SIZE >= 8) {
$digit = $carry >> 16;
$remainder = $carry & 0xFFFF;
} else {
$digit = $carry >> 8;
$remainder = $carry & 0xFF;
}
if ($digit || $quotient) {
$quotient[] = $digit;
}
}
$bytes[] = $remainder;
$count = \count($digits = $quotient);
}
return pack(\PHP_INT_SIZE >= 8 ? 'n*' : 'C*', ...array_reverse($bytes));
}
public static function add(string $a, string $b): string
{
$carry = 0;
for ($i = 7; 0 <= $i; --$i) {
$carry += \ord($a[$i]) + \ord($b[$i]);
$a[$i] = \chr($carry & 0xFF);
$carry >>= 8;
}
return $a;
}
/**
* @param string $time Count of 100-nanosecond intervals since the UUID epoch 1582-10-15 00:00:00 in hexadecimal
*
* @return string Count of 100-nanosecond intervals since the UUID epoch 1582-10-15 00:00:00 as a numeric string
*/
public static function hexToNumericString(string $time): string
{
if (\PHP_INT_SIZE >= 8) {
$time = (string) (hexdec($time) - self::TIME_OFFSET_INT);
} else {
$time = str_pad(hex2bin($time), 8, "\0", \STR_PAD_LEFT);
if (self::TIME_OFFSET_BIN <= $time) {
$time = self::add($time, self::TIME_OFFSET_COM2);
$time[0] = $time[0] & "\x7F";
$time = self::toBase($time, self::BASE10);
} else {
$time = self::add($time, self::TIME_OFFSET_COM1);
$time = '-'.self::toBase($time ^ "\xff\xff\xff\xff\xff\xff\xff\xff", self::BASE10);
}
}
if (9 > \strlen($time)) {
$time = '-' === $time[0] ? '-'.str_pad(substr($time, 1), 8, '0', \STR_PAD_LEFT) : str_pad($time, 8, '0', \STR_PAD_LEFT);
}
return $time;
}
/**
* Sub-microseconds are lost since they are not handled by \DateTimeImmutable.
*
* @param string $time Count of 100-nanosecond intervals since the UUID epoch 1582-10-15 00:00:00 in hexadecimal
*/
public static function hexToDateTime(string $time): \DateTimeImmutable
{
return \DateTimeImmutable::createFromFormat('U.u?', substr_replace(self::hexToNumericString($time), '.', -7, 0));
}
/**
* @return string Count of 100-nanosecond intervals since the UUID epoch 1582-10-15 00:00:00 in hexadecimal
*/
public static function dateTimeToHex(\DateTimeInterface $time): string
{
if (\PHP_INT_SIZE >= 8) {
if (-self::TIME_OFFSET_INT > $time = (int) $time->format('Uu0')) {
throw new \InvalidArgumentException('The given UUID date cannot be earlier than 1582-10-15.');
}
return str_pad(dechex(self::TIME_OFFSET_INT + $time), 16, '0', \STR_PAD_LEFT);
}
$time = $time->format('Uu0');
$negative = '-' === $time[0];
if ($negative && self::TIME_OFFSET_INT < $time = substr($time, 1)) {
throw new \InvalidArgumentException('The given UUID date cannot be earlier than 1582-10-15.');
}
$time = self::fromBase($time, self::BASE10);
$time = str_pad($time, 8, "\0", \STR_PAD_LEFT);
if ($negative) {
$time = self::add($time, self::TIME_OFFSET_COM1) ^ "\xff\xff\xff\xff\xff\xff\xff\xff";
} else {
$time = self::add($time, self::TIME_OFFSET_BIN);
}
return bin2hex($time);
}
}