private function decodeBigUint($bytes)
{
$maxUintBytes = log(PHP_INT_MAX, 2) / 8;
$byteLength = Util2::stringLength($bytes);
if ($byteLength == 0) {
return 0;
}
$numberOfLongs = ceil($byteLength / 4);
$paddedLength = $numberOfLongs * 4;
$paddedBytes = $this->zeroPadLeft($bytes, $paddedLength);
$unpacked = array_merge(unpack("N{$numberOfLongs}", $paddedBytes));
$integer = 0;
// 2^32
$twoTo32 = '4294967296';
foreach ($unpacked as $part) {
// We only use gmp or bcmath if the final value is too big
if ($byteLength <= $maxUintBytes) {
$integer = ($integer << 32) + $part;
} elseif (extension_loaded('gmp')) {
$integer = gmp_strval(gmp_add(gmp_mul($integer, $twoTo32), $part));
} elseif (extension_loaded('bcmath')) {
$integer = bcadd(bcmul($integer, $twoTo32), $part);
} else {
throw new RuntimeException('The gmp or bcmath extension must be installed to read this database.');
}
}
return $integer;
}
