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<?php |
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namespace Jabe\Engine\Impl\Util; |
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use Jabe\Engine\Impl\ProcessEngineLogger; |
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class BitMaskUtil |
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{ |
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//private static final EngineUtilLogger LOG = ProcessEngineLogger.UTIL_LOGGER; |
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// First 8 masks as constant to prevent having to math.pow() every time a bit needs flippin'. |
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private const FLAG_BIT_1 = 1; // 000...00000001 |
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private const FLAG_BIT_2 = 2; // 000...00000010 |
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private const FLAG_BIT_3 = 4; // 000...00000100 |
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private const FLAG_BIT_4 = 8; // 000...00001000 |
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private const FLAG_BIT_5 = 16; // 000...00010000 |
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private const FLAG_BIT_6 = 32; // 000...00100000 |
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private const FLAG_BIT_7 = 64; // 000...01000000 |
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private const FLAG_BIT_8 = 128; // 000...10000000 |
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private const MASKS = [self::FLAG_BIT_1, self::FLAG_BIT_2, self::FLAG_BIT_3, self::FLAG_BIT_4, self::FLAG_BIT_5, self::FLAG_BIT_6, self::FLAG_BIT_7, self::FLAG_BIT_8]; |
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/** |
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* Set bit to '1' in the given int. |
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* @param current integer value |
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* @param bitNumber number of the bit to set to '1' (right first bit starting at 1). |
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*/ |
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public static function setBitOn(int $value, int $bitNumber): int |
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{ |
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self::ensureBitRange($bitNumber); |
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// To turn on, OR with the correct mask |
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return $value | self::MASKS[$bitNumber - 1]; |
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} |
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/** |
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* Set bit to '0' in the given int. |
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* @param current integer value |
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* @param bitNumber number of the bit to set to '0' (right first bit starting at 1). |
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*/ |
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public static function setBitOff(int $value, int $bitNumber): int |
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{ |
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self::ensureBitRange($bitNumber); |
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// To turn on, OR with the correct mask |
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return $value & ~self::MASKS[$bitNumber - 1]; |
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} |
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/** |
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* Check if the bit is set to '1' |
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* @param value integer to check bit |
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* @param number of bit to check (right first bit starting at 1) |
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*/ |
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public static function isBitOn(int $value, int $bitNumber): bool |
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{ |
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self::ensureBitRange($bitNumber); |
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return (($value & self::MASKS[$bitNumber - 1]) == self::MASKS[$bitNumber - 1]); |
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} |
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/** |
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* Set bit to '0' or '1' in the given int. |
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* @param current integer value |
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* @param bitNumber number of the bit to set to '0' or '1' (right first bit starting at 1). |
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* @param bitValue if true, bit set to '1'. If false, '0'. |
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*/ |
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public static function setBit(int $value, int $bitNumber, bool $bitValue): int |
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{ |
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if ($bitValue) { |
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return self::setBitOn($value, $bitNumber); |
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} else { |
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return self::setBitOff($value, $bitNumber); |
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} |
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} |
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public static function getMaskForBit(int $bitNumber): int |
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{ |
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return self::MASKS[$bitNumber - 1]; |
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} |
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private static function ensureBitRange(int $bitNumber): void |
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{ |
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if ($bitNumber <= 0 && $bitNumber > 8) { |
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//throw LOG.invalidBitNumber(bitNumber); |
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throw new \Exception("invalidBitNumber"); |
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} |
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} |
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} |
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bingo-soft /
jabe
