org.xnio

Class Bits

java.lang.Object

org.xnio.Bits

public final class Bits
extends Object

General bit-affecting utility methods.

Author:

David M. Lloyd

Method Summary

Modifier and Type	Method and Description
static boolean	allAreClear(int var, int flags) Determine if all of the flags in the given var are clear.
static boolean	allAreClear(long var, long flags) Determine if all of the flags in the given var are clear.
static boolean	allAreSet(int var, int flags) Determine if all of the flags in the given var are set.
static boolean	allAreSet(long var, long flags) Determine if all of the flags in the given var are set.
static boolean	anyAreClear(int var, int flags) Determine if any of the flags in the given var are clear.
static boolean	anyAreClear(long var, long flags) Determine if any of the flags in the given var are clear.
static boolean	anyAreSet(int var, int flags) Determine if any of the flags in the given var are set.
static boolean	anyAreSet(long var, long flags) Determine if any of the flags in the given var are set.
static char	charFromBytesBE(byte[] b, int off) Get a 16-bit signed big-endian char value from a byte array.
static char	charFromBytesLE(byte[] b, int off) Get a 16-bit signed little-endian char value from a byte array.
static int	intBitMask(int low, int high) Get an integer bit mask consisting of 1 bits in the given range.
static int	intFromBytesBE(byte[] b, int off) Get a 32-bit signed big-endian int value from a byte array.
static int	intFromBytesLE(byte[] b, int off) Get a 32-bit signed little-endian int value from a byte array.
static long	longBitMask(int low, int high) Get a long bit mask consisting of 1 bits in the given range.
static long	longFromBytesBE(byte[] b, int off) Get a 64-bit signed big-endian long value from a byte array.
static long	longFromBytesLE(byte[] b, int off) Get a 64-bit signed little-endian long value from a byte array.
static int	mediumFromBytesBE(byte[] b, int off) Get a 24-bit signed big-endian int value from a byte array.
static int	mediumFromBytesLE(byte[] b, int off) Get a 24-bit signed little-endian int value from a byte array.
static short	shortFromBytesBE(byte[] b, int off) Get a 16-bit signed big-endian short value from a byte array.
static short	shortFromBytesLE(byte[] b, int off) Get a 16-bit signed little-endian short value from a byte array.
static int	unsigned(byte v) Convert a signed value to unsigned.
static long	unsigned(int v) Convert a signed value to unsigned.
static int	unsigned(short v) Convert a signed value to unsigned.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

intBitMask

public static int intBitMask(int low,
                             int high)

Get an integer bit mask consisting of 1 bits in the given range. The returned int will have bits low through high set, and all other bits clear.

Parameters:

low - the low bit value

high - the high bit value

Returns:

the bit mask

longBitMask

public static long longBitMask(int low,
                               int high)

Get a long bit mask consisting of 1 bits in the given range. The returned long will have bits low through high set, and all other bits clear.

Parameters:

low - the low bit value

high - the high bit value

Returns:

the bit mask

anyAreSet

public static boolean anyAreSet(int var,
                                int flags)

Determine if any of the flags in the given var are set.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if any of flags are in var, false otherwise

allAreSet

public static boolean allAreSet(int var,
                                int flags)

Determine if all of the flags in the given var are set.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if all of flags are in var, false otherwise

anyAreClear

public static boolean anyAreClear(int var,
                                  int flags)

Determine if any of the flags in the given var are clear.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if not all of flags are in var, false otherwise

allAreClear

public static boolean allAreClear(int var,
                                  int flags)

Determine if all of the flags in the given var are clear.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if none of flags are in var, false otherwise

anyAreSet

public static boolean anyAreSet(long var,
                                long flags)

Determine if any of the flags in the given var are set.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if any of flags are in var, false otherwise

allAreSet

public static boolean allAreSet(long var,
                                long flags)

Determine if all of the flags in the given var are set.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if all of flags are in var, false otherwise

anyAreClear

public static boolean anyAreClear(long var,
                                  long flags)

Determine if any of the flags in the given var are clear.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if not all of flags are in var, false otherwise

allAreClear

public static boolean allAreClear(long var,
                                  long flags)

Determine if all of the flags in the given var are clear.

Parameters:

var - the value to test

flags - the flags to test for

Returns:

true if none of flags are in var, false otherwise

unsigned

public static int unsigned(byte v)

Convert a signed value to unsigned.

Parameters:

v - the signed byte

Returns:

the unsigned byte, as an int

unsigned

public static int unsigned(short v)

Convert a signed value to unsigned.

Parameters:

v - the signed short

Returns:

the unsigned short, as an int

unsigned

public static long unsigned(int v)

Convert a signed value to unsigned.

Parameters:

v - the signed int

Returns:

the unsigned int, as a long

shortFromBytesLE

public static short shortFromBytesLE(byte[] b,
                                     int off)

Get a 16-bit signed little-endian short value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed short value

shortFromBytesBE

public static short shortFromBytesBE(byte[] b,
                                     int off)

Get a 16-bit signed big-endian short value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed short value

charFromBytesLE

public static char charFromBytesLE(byte[] b,
                                   int off)

Get a 16-bit signed little-endian char value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed char value

charFromBytesBE

public static char charFromBytesBE(byte[] b,
                                   int off)

Get a 16-bit signed big-endian char value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed char value

mediumFromBytesLE

public static int mediumFromBytesLE(byte[] b,
                                    int off)

Get a 24-bit signed little-endian int value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed medium value as an int

mediumFromBytesBE

public static int mediumFromBytesBE(byte[] b,
                                    int off)

Get a 24-bit signed big-endian int value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed medium value as an int

intFromBytesLE

public static int intFromBytesLE(byte[] b,
                                 int off)

Get a 32-bit signed little-endian int value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed int value

intFromBytesBE

public static int intFromBytesBE(byte[] b,
                                 int off)

Get a 32-bit signed big-endian int value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed int value

longFromBytesLE

public static long longFromBytesLE(byte[] b,
                                   int off)

Get a 64-bit signed little-endian long value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed long value

longFromBytesBE

public static long longFromBytesBE(byte[] b,
                                   int off)

Get a 64-bit signed big-endian long value from a byte array.

Parameters:

b - the byte array

off - the offset in the array

Returns:

the signed long value