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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3;
import java.util.UUID;
/**
* Static methods to convert a type into another, with endianness and bit ordering awareness.
*
*
* The methods names follow a naming rule:
* {@code [source endianness][source bit ordering]To[destination endianness][destination bit ordering]}
*
*
* Source/destination type fields is one of the following:
*
*
*
binary: an array of booleans
*
byte or byteArray
*
int or intArray
*
long or longArray
*
hex: a String containing hexadecimal digits (lowercase in destination)
*
hexDigit: a Char containing a hexadecimal digit (lowercase in destination)
*
uuid
*
*
* Endianness field: little endian is the default, in this case the field is absent. In case of
* big endian, the field is "Be". Bit ordering: Lsb0 is the default, in this case the field
* is absent. In case of Msb0, the field is "Msb0".
*
*
* Example: intBeMsb0ToHex convert an int with big endian byte order and Msb0 bit order into its
* hexadecimal string representation
*
*
* Most of the methods provide only default encoding for destination, this limits the number of
* ways to do one thing. Unless you are dealing with data from/to outside of the JVM platform,
* you should not need to use "Be" and "Msb0" methods.
*
*
* Development status: work on going, only a part of the little endian, Lsb0 methods implemented
* so far.
*
*
* @since 3.2
*/
public class Conversion {
private static final boolean[] TTTT = {true, true, true, true};
private static final boolean[] FTTT = {false, true, true, true};
private static final boolean[] TFTT = {true, false, true, true};
private static final boolean[] FFTT = {false, false, true, true};
private static final boolean[] TTFT = {true, true, false, true};
private static final boolean[] FTFT = {false, true, false, true};
private static final boolean[] TFFT = {true, false, false, true};
private static final boolean[] FFFT = {false, false, false, true};
private static final boolean[] TTTF = {true, true, true, false};
private static final boolean[] FTTF = {false, true, true, false};
private static final boolean[] TFTF = {true, false, true, false};
private static final boolean[] FFTF = {false, false, true, false};
private static final boolean[] TTFF = {true, true, false, false};
private static final boolean[] FTFF = {false, true, false, false};
private static final boolean[] TFFF = {true, false, false, false};
private static final boolean[] FFFF = {false, false, false, false};
/**
* Converts the first 4 bits of a binary (represented as boolean array) in big endian Msb0
* bit ordering to a hexadecimal digit.
*
*
* (1, 0, 0, 0) is converted as follow: '8' (1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0) is converted
* to '4'
*
*
* @param src the binary to convert
* @return a hexadecimal digit representing the selected bits
* @throws IllegalArgumentException if {@code src} is empty
* @throws NullPointerException if {@code src} is {@code null}
*/
public static char binaryBeMsb0ToHexDigit(final boolean[] src) {
return binaryBeMsb0ToHexDigit(src, 0);
}
/**
* Converts a binary (represented as boolean array) in big endian Msb0 bit ordering to a
* hexadecimal digit.
*
*
* (1, 0, 0, 0) with srcPos = 0 is converted as follow: '8' (1, 0, 0, 0, 0, 0, 0, 0,
* 0, 0, 0, 1, 0, 1, 0, 0) with srcPos = 2 is converted to '5'
*
*
* @param src the binary to convert
* @param srcPos the position of the lsb to start the conversion
* @return a hexadecimal digit representing the selected bits
* @throws IllegalArgumentException if {@code src} is empty
* @throws NullPointerException if {@code src} is {@code null}
* @throws IndexOutOfBoundsException if {@code srcPos} is outside the array.
*/
public static char binaryBeMsb0ToHexDigit(final boolean[] src, final int srcPos) {
// JDK 9: Objects.checkIndex(int index, int length)
if (Integer.compareUnsigned(srcPos, src.length) >= 0) {
// Throw the correct exception
if (src.length == 0) {
throw new IllegalArgumentException("Cannot convert an empty array.");
}
throw new IndexOutOfBoundsException(srcPos + " is not within array length " + src.length);
}
// Little-endian bit 0 position
final int pos = src.length - 1 - srcPos;
if (3 <= pos && src[pos - 3]) {
if (src[pos - 2]) {
if (src[pos - 1]) {
return src[pos] ? 'f' : 'e';
}
return src[pos] ? 'd' : 'c';
}
if (src[pos - 1]) {
return src[pos] ? 'b' : 'a';
}
return src[pos] ? '9' : '8';
}
if (2 <= pos && src[pos - 2]) {
if (src[pos - 1]) {
return src[pos] ? '7' : '6';
}
return src[pos] ? '5' : '4';
}
if (1 <= pos && src[pos - 1]) {
return src[pos] ? '3' : '2';
}
return src[pos] ? '1' : '0';
}
/**
* Converts binary (represented as boolean array) into a byte using the default (little
* endian, Lsb0) byte and bit ordering.
*
* @param src the binary to convert
* @param srcPos the position in {@code src}, in boolean unit, from where to start the
* conversion
* @param dstInit initial value of the destination byte
* @param dstPos the position of the lsb, in bits, in the result byte
* @param nBools the number of booleans to convert
* @return a byte containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+dstPos >= 8}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBools > src.length}
*/
public static byte binaryToByte(final boolean[] src, final int srcPos, final byte dstInit, final int dstPos,
final int nBools) {
if (src.length == 0 && srcPos == 0 || 0 == nBools) {
return dstInit;
}
if (nBools - 1 + dstPos >= 8) {
throw new IllegalArgumentException("nBools-1+dstPos is greater or equal to than 8");
}
byte out = dstInit;
for (int i = 0; i < nBools; i++) {
final int shift = i + dstPos;
final int bits = (src[i + srcPos] ? 1 : 0) << shift;
final int mask = 0x1 << shift;
out = (byte) ((out & ~mask) | bits);
}
return out;
}
/**
* Converts binary (represented as boolean array) to a hexadecimal digit using the default
* (Lsb0) bit ordering.
*
*
* (1, 0, 0, 0) is converted as follow: '1'
*
*
* @param src the binary to convert
* @return a hexadecimal digit representing the selected bits
* @throws IllegalArgumentException if {@code src} is empty
* @throws NullPointerException if {@code src} is {@code null}
*/
public static char binaryToHexDigit(final boolean[] src) {
return binaryToHexDigit(src, 0);
}
/**
* Converts binary (represented as boolean array) to a hexadecimal digit using the default
* (Lsb0) bit ordering.
*
*
* (1, 0, 0, 0) is converted as follow: '1'
*
*
* @param src the binary to convert
* @param srcPos the position of the lsb to start the conversion
* @return a hexadecimal digit representing the selected bits
* @throws IllegalArgumentException if {@code src} is empty
* @throws NullPointerException if {@code src} is {@code null}
*/
public static char binaryToHexDigit(final boolean[] src, final int srcPos) {
if (src.length == 0) {
throw new IllegalArgumentException("Cannot convert an empty array.");
}
if (src.length > srcPos + 3 && src[srcPos + 3]) {
if (src[srcPos + 2]) {
if (src[srcPos + 1]) {
return src[srcPos] ? 'f' : 'e';
}
return src[srcPos] ? 'd' : 'c';
}
if (src[srcPos + 1]) {
return src[srcPos] ? 'b' : 'a';
}
return src[srcPos] ? '9' : '8';
}
if (src.length > srcPos + 2 && src[srcPos + 2]) {
if (src[srcPos + 1]) {
return src[srcPos] ? '7' : '6';
}
return src[srcPos] ? '5' : '4';
}
if (src.length > srcPos + 1 && src[srcPos + 1]) {
return src[srcPos] ? '3' : '2';
}
return src[srcPos] ? '1' : '0';
}
/**
* Converts binary (represented as boolean array) to a hexadecimal digit using the Msb0 bit
* ordering.
*
*
* (1, 0, 0, 0) is converted as follow: '8'
*
*
* @param src the binary to convert
* @return a hexadecimal digit representing the selected bits
* @throws IllegalArgumentException if {@code src} is empty, {@code src.length < 4} or
* {@code src.length > 8}
* @throws NullPointerException if {@code src} is {@code null}
*/
public static char binaryToHexDigitMsb0_4bits(final boolean[] src) {
return binaryToHexDigitMsb0_4bits(src, 0);
}
/**
* Converts binary (represented as boolean array) to a hexadecimal digit using the Msb0 bit
* ordering.
*
*
* (1, 0, 0, 0) is converted as follow: '8' (1, 0, 0, 1, 1, 0, 1, 0) with srcPos = 3 is converted
* to 'D'
*
*
* @param src the binary to convert
* @param srcPos the position of the lsb to start the conversion
* @return a hexadecimal digit representing the selected bits
* @throws IllegalArgumentException if {@code src} is empty, {@code src.length > 8} or
* {@code src.length - srcPos < 4}
* @throws NullPointerException if {@code src} is {@code null}
*/
public static char binaryToHexDigitMsb0_4bits(final boolean[] src, final int srcPos) {
if (src.length > 8) {
throw new IllegalArgumentException("src.length>8: src.length=" + src.length);
}
if (src.length - srcPos < 4) {
throw new IllegalArgumentException("src.length-srcPos<4: src.length=" + src.length + ", srcPos=" + srcPos);
}
if (src[srcPos + 3]) {
if (src[srcPos + 2]) {
if (src[srcPos + 1]) {
return src[srcPos] ? 'f' : '7';
}
return src[srcPos] ? 'b' : '3';
}
if (src[srcPos + 1]) {
return src[srcPos] ? 'd' : '5';
}
return src[srcPos] ? '9' : '1';
}
if (src[srcPos + 2]) {
if (src[srcPos + 1]) {
return src[srcPos] ? 'e' : '6';
}
return src[srcPos] ? 'a' : '2';
}
if (src[srcPos + 1]) {
return src[srcPos] ? 'c' : '4';
}
return src[srcPos] ? '8' : '0';
}
/**
* Converts binary (represented as boolean array) into an int using the default (little
* endian, Lsb0) byte and bit ordering.
*
* @param src the binary to convert
* @param srcPos the position in {@code src}, in boolean unit, from where to start the
* conversion
* @param dstInit initial value of the destination int
* @param dstPos the position of the lsb, in bits, in the result int
* @param nBools the number of booleans to convert
* @return an int containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+dstPos >= 32}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBools > src.length}
*/
public static int binaryToInt(final boolean[] src, final int srcPos, final int dstInit, final int dstPos,
final int nBools) {
if (src.length == 0 && srcPos == 0 || 0 == nBools) {
return dstInit;
}
if (nBools - 1 + dstPos >= 32) {
throw new IllegalArgumentException("nBools-1+dstPos is greater or equal to than 32");
}
int out = dstInit;
for (int i = 0; i < nBools; i++) {
final int shift = i + dstPos;
final int bits = (src[i + srcPos] ? 1 : 0) << shift;
final int mask = 0x1 << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts binary (represented as boolean array) into a long using the default (little
* endian, Lsb0) byte and bit ordering.
*
* @param src the binary to convert
* @param srcPos the position in {@code src}, in boolean unit, from where to start the
* conversion
* @param dstInit initial value of the destination long
* @param dstPos the position of the lsb, in bits, in the result long
* @param nBools the number of booleans to convert
* @return a long containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+dstPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBools > src.length}
*/
public static long binaryToLong(final boolean[] src, final int srcPos, final long dstInit, final int dstPos,
final int nBools) {
if (src.length == 0 && srcPos == 0 || 0 == nBools) {
return dstInit;
}
if (nBools - 1 + dstPos >= 64) {
throw new IllegalArgumentException("nBools-1+dstPos is greater or equal to than 64");
}
long out = dstInit;
for (int i = 0; i < nBools; i++) {
final int shift = i + dstPos;
final long bits = (src[i + srcPos] ? 1L : 0) << shift;
final long mask = 0x1L << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts binary (represented as boolean array) into a short using the default (little
* endian, Lsb0) byte and bit ordering.
*
* @param src the binary to convert
* @param srcPos the position in {@code src}, in boolean unit, from where to start the
* conversion
* @param dstInit initial value of the destination short
* @param dstPos the position of the lsb, in bits, in the result short
* @param nBools the number of booleans to convert
* @return a short containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+dstPos >= 16}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBools > src.length}
*/
public static short binaryToShort(final boolean[] src, final int srcPos, final short dstInit, final int dstPos,
final int nBools) {
if (src.length == 0 && srcPos == 0 || 0 == nBools) {
return dstInit;
}
if (nBools - 1 + dstPos >= 16) {
throw new IllegalArgumentException("nBools-1+dstPos is greater or equal to than 16");
}
short out = dstInit;
for (int i = 0; i < nBools; i++) {
final int shift = i + dstPos;
final int bits = (src[i + srcPos] ? 1 : 0) << shift;
final int mask = 0x1 << shift;
out = (short) ((out & ~mask) | bits);
}
return out;
}
/**
* Converts an array of byte into an int using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the byte array to convert
* @param srcPos the position in {@code src}, in byte unit, from where to start the
* conversion
* @param dstInit initial value of the destination int
* @param dstPos the position of the lsb, in bits, in the result int
* @param nBytes the number of bytes to convert
* @return an int containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code (nBytes-1)*8+dstPos >= 32}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBytes > src.length}
*/
public static int byteArrayToInt(final byte[] src, final int srcPos, final int dstInit, final int dstPos,
final int nBytes) {
if (src.length == 0 && srcPos == 0 || 0 == nBytes) {
return dstInit;
}
if ((nBytes - 1) * 8 + dstPos >= 32) {
throw new IllegalArgumentException("(nBytes-1)*8+dstPos is greater or equal to than 32");
}
int out = dstInit;
for (int i = 0; i < nBytes; i++) {
final int shift = i * 8 + dstPos;
final int bits = (0xff & src[i + srcPos]) << shift;
final int mask = 0xff << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts an array of byte into a long using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the byte array to convert
* @param srcPos the position in {@code src}, in byte unit, from where to start the
* conversion
* @param dstInit initial value of the destination long
* @param dstPos the position of the lsb, in bits, in the result long
* @param nBytes the number of bytes to convert
* @return a long containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code (nBytes-1)*8+dstPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBytes > src.length}
*/
public static long byteArrayToLong(final byte[] src, final int srcPos, final long dstInit, final int dstPos,
final int nBytes) {
if (src.length == 0 && srcPos == 0 || 0 == nBytes) {
return dstInit;
}
if ((nBytes - 1) * 8 + dstPos >= 64) {
throw new IllegalArgumentException("(nBytes-1)*8+dstPos is greater or equal to than 64");
}
long out = dstInit;
for (int i = 0; i < nBytes; i++) {
final int shift = i * 8 + dstPos;
final long bits = (0xffL & src[i + srcPos]) << shift;
final long mask = 0xffL << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts an array of byte into a short using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the byte array to convert
* @param srcPos the position in {@code src}, in byte unit, from where to start the
* conversion
* @param dstInit initial value of the destination short
* @param dstPos the position of the lsb, in bits, in the result short
* @param nBytes the number of bytes to convert
* @return a short containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code (nBytes-1)*8+dstPos >= 16}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nBytes > src.length}
*/
public static short byteArrayToShort(final byte[] src, final int srcPos, final short dstInit, final int dstPos,
final int nBytes) {
if (src.length == 0 && srcPos == 0 || 0 == nBytes) {
return dstInit;
}
if ((nBytes - 1) * 8 + dstPos >= 16) {
throw new IllegalArgumentException("(nBytes-1)*8+dstPos is greater or equal to than 16");
}
short out = dstInit;
for (int i = 0; i < nBytes; i++) {
final int shift = i * 8 + dstPos;
final int bits = (0xff & src[i + srcPos]) << shift;
final int mask = 0xff << shift;
out = (short) ((out & ~mask) | bits);
}
return out;
}
/**
* Converts bytes from an array into a UUID using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the byte array to convert
* @param srcPos the position in {@code src} where to copy the result from
* @return a UUID
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if array does not contain at least 16 bytes beginning
* with {@code srcPos}
*/
public static UUID byteArrayToUuid(final byte[] src, final int srcPos) {
if (src.length - srcPos < 16) {
throw new IllegalArgumentException("Need at least 16 bytes for UUID");
}
return new UUID(byteArrayToLong(src, srcPos, 0, 0, 8), byteArrayToLong(src, srcPos + 8, 0, 0, 8));
}
/**
* Converts a byte into an array of boolean using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the byte to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBools the number of booleans to copy to {@code dst}, must be smaller or equal to
* the width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+srcPos >= 8}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBools > dst.length}
*/
public static boolean[] byteToBinary(final byte src, final int srcPos, final boolean[] dst, final int dstPos,
final int nBools) {
if (0 == nBools) {
return dst;
}
if (nBools - 1 + srcPos >= 8) {
throw new IllegalArgumentException("nBools-1+srcPos is greater or equal to than 8");
}
for (int i = 0; i < nBools; i++) {
final int shift = i + srcPos;
dst[dstPos + i] = (0x1 & (src >> shift)) != 0;
}
return dst;
}
/**
* Converts a byte into an array of Char using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the byte to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dstInit the initial value for the result String
* @param dstPos the position in {@code dst} where to copy the result
* @param nHexs the number of Chars to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws IllegalArgumentException if {@code (nHexs-1)*4+srcPos >= 8}
* @throws StringIndexOutOfBoundsException if {@code dst.init.length() < dstPos}
*/
public static String byteToHex(final byte src, final int srcPos, final String dstInit, final int dstPos,
final int nHexs) {
if (0 == nHexs) {
return dstInit;
}
if ((nHexs - 1) * 4 + srcPos >= 8) {
throw new IllegalArgumentException("(nHexs-1)*4+srcPos is greater or equal to than 8");
}
final StringBuilder sb = new StringBuilder(dstInit);
int append = sb.length();
for (int i = 0; i < nHexs; i++) {
final int shift = i * 4 + srcPos;
final int bits = 0xF & (src >> shift);
if (dstPos + i == append) {
++append;
sb.append(intToHexDigit(bits));
} else {
sb.setCharAt(dstPos + i, intToHexDigit(bits));
}
}
return sb.toString();
}
/**
* Converts a hexadecimal digit into binary (represented as boolean array) using the Msb0
* bit ordering.
*
*
* '1' is converted as follow: (0, 0, 0, 1)
*
*
* @param hexDigit the hexadecimal digit to convert
* @return a boolean array with the binary representation of {@code hexDigit}
* @throws IllegalArgumentException if {@code hexDigit} is not a hexadecimal digit
*/
public static boolean[] hexDigitMsb0ToBinary(final char hexDigit) {
switch (hexDigit) {
case '0':
return FFFF.clone();
case '1':
return FFFT.clone();
case '2':
return FFTF.clone();
case '3':
return FFTT.clone();
case '4':
return FTFF.clone();
case '5':
return FTFT.clone();
case '6':
return FTTF.clone();
case '7':
return FTTT.clone();
case '8':
return TFFF.clone();
case '9':
return TFFT.clone();
case 'a':// fall through
case 'A':
return TFTF.clone();
case 'b':// fall through
case 'B':
return TFTT.clone();
case 'c':// fall through
case 'C':
return TTFF.clone();
case 'd':// fall through
case 'D':
return TTFT.clone();
case 'e':// fall through
case 'E':
return TTTF.clone();
case 'f':// fall through
case 'F':
return TTTT.clone();
default:
throw new IllegalArgumentException("Cannot interpret '" + hexDigit + "' as a hexadecimal digit");
}
}
/**
* Converts a hexadecimal digit into an int using the Msb0 bit ordering.
*
*
* '1' is converted to 8
*
*
* @param hexDigit the hexadecimal digit to convert
* @return an int equals to {@code hexDigit}
* @throws IllegalArgumentException if {@code hexDigit} is not a hexadecimal digit
*/
public static int hexDigitMsb0ToInt(final char hexDigit) {
switch (hexDigit) {
case '0':
return 0x0;
case '1':
return 0x8;
case '2':
return 0x4;
case '3':
return 0xC;
case '4':
return 0x2;
case '5':
return 0xA;
case '6':
return 0x6;
case '7':
return 0xE;
case '8':
return 0x1;
case '9':
return 0x9;
case 'a':// fall through
case 'A':
return 0x5;
case 'b':// fall through
case 'B':
return 0xD;
case 'c':// fall through
case 'C':
return 0x3;
case 'd':// fall through
case 'D':
return 0xB;
case 'e':// fall through
case 'E':
return 0x7;
case 'f':// fall through
case 'F':
return 0xF;
default:
throw new IllegalArgumentException("Cannot interpret '" + hexDigit + "' as a hexadecimal digit");
}
}
/**
* Converts a hexadecimal digit into binary (represented as boolean array) using the default
* (Lsb0) bit ordering.
*
*
* '1' is converted as follow: (1, 0, 0, 0)
*
*
* @param hexDigit the hexadecimal digit to convert
* @return a boolean array with the binary representation of {@code hexDigit}
* @throws IllegalArgumentException if {@code hexDigit} is not a hexadecimal digit
*/
public static boolean[] hexDigitToBinary(final char hexDigit) {
switch (hexDigit) {
case '0':
return FFFF.clone();
case '1':
return TFFF.clone();
case '2':
return FTFF.clone();
case '3':
return TTFF.clone();
case '4':
return FFTF.clone();
case '5':
return TFTF.clone();
case '6':
return FTTF.clone();
case '7':
return TTTF.clone();
case '8':
return FFFT.clone();
case '9':
return TFFT.clone();
case 'a':// fall through
case 'A':
return FTFT.clone();
case 'b':// fall through
case 'B':
return TTFT.clone();
case 'c':// fall through
case 'C':
return FFTT.clone();
case 'd':// fall through
case 'D':
return TFTT.clone();
case 'e':// fall through
case 'E':
return FTTT.clone();
case 'f':// fall through
case 'F':
return TTTT.clone();
default:
throw new IllegalArgumentException("Cannot interpret '" + hexDigit + "' as a hexadecimal digit");
}
}
/**
* Converts a hexadecimal digit into an int using the default (Lsb0) bit ordering.
*
*
* '1' is converted to 1
*
*
* @param hexDigit the hexadecimal digit to convert
* @return an int equals to {@code hexDigit}
* @throws IllegalArgumentException if {@code hexDigit} is not a hexadecimal digit
*/
public static int hexDigitToInt(final char hexDigit) {
final int digit = Character.digit(hexDigit, 16);
if (digit < 0) {
throw new IllegalArgumentException("Cannot interpret '" + hexDigit + "' as a hexadecimal digit");
}
return digit;
}
/**
* Converts an array of Char into a byte using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the hexadecimal string to convert
* @param srcPos the position in {@code src}, in Char unit, from where to start the
* conversion
* @param dstInit initial value of the destination byte
* @param dstPos the position of the lsb, in bits, in the result byte
* @param nHex the number of Chars to convert
* @return a byte containing the selected bits
* @throws IllegalArgumentException if {@code (nHexs-1)*4+dstPos >= 8}
*/
public static byte hexToByte(final String src, final int srcPos, final byte dstInit, final int dstPos,
final int nHex) {
if (0 == nHex) {
return dstInit;
}
if ((nHex - 1) * 4 + dstPos >= 8) {
throw new IllegalArgumentException("(nHexs-1)*4+dstPos is greater or equal to than 8");
}
byte out = dstInit;
for (int i = 0; i < nHex; i++) {
final int shift = i * 4 + dstPos;
final int bits = (0xf & hexDigitToInt(src.charAt(i + srcPos))) << shift;
final int mask = 0xf << shift;
out = (byte) ((out & ~mask) | bits);
}
return out;
}
/**
* Converts an array of Char into an int using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the hexadecimal string to convert
* @param srcPos the position in {@code src}, in Char unit, from where to start the
* conversion
* @param dstInit initial value of the destination int
* @param dstPos the position of the lsb, in bits, in the result int
* @param nHex the number of Chars to convert
* @return an int containing the selected bits
* @throws IllegalArgumentException if {@code (nHexs-1)*4+dstPos >= 32}
*/
public static int hexToInt(final String src, final int srcPos, final int dstInit, final int dstPos, final int nHex) {
if (0 == nHex) {
return dstInit;
}
if ((nHex - 1) * 4 + dstPos >= 32) {
throw new IllegalArgumentException("(nHexs-1)*4+dstPos is greater or equal to than 32");
}
int out = dstInit;
for (int i = 0; i < nHex; i++) {
final int shift = i * 4 + dstPos;
final int bits = (0xf & hexDigitToInt(src.charAt(i + srcPos))) << shift;
final int mask = 0xf << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts an array of Char into a long using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the hexadecimal string to convert
* @param srcPos the position in {@code src}, in Char unit, from where to start the
* conversion
* @param dstInit initial value of the destination long
* @param dstPos the position of the lsb, in bits, in the result long
* @param nHex the number of Chars to convert
* @return a long containing the selected bits
* @throws IllegalArgumentException if {@code (nHexs-1)*4+dstPos >= 64}
*/
public static long hexToLong(final String src, final int srcPos, final long dstInit, final int dstPos,
final int nHex) {
if (0 == nHex) {
return dstInit;
}
if ((nHex - 1) * 4 + dstPos >= 64) {
throw new IllegalArgumentException("(nHexs-1)*4+dstPos is greater or equal to than 64");
}
long out = dstInit;
for (int i = 0; i < nHex; i++) {
final int shift = i * 4 + dstPos;
final long bits = (0xfL & hexDigitToInt(src.charAt(i + srcPos))) << shift;
final long mask = 0xfL << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts an array of Char into a short using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the hexadecimal string to convert
* @param srcPos the position in {@code src}, in Char unit, from where to start the
* conversion
* @param dstInit initial value of the destination short
* @param dstPos the position of the lsb, in bits, in the result short
* @param nHex the number of Chars to convert
* @return a short containing the selected bits
* @throws IllegalArgumentException if {@code (nHexs-1)*4+dstPos >= 16}
*/
public static short hexToShort(final String src, final int srcPos, final short dstInit, final int dstPos,
final int nHex) {
if (0 == nHex) {
return dstInit;
}
if ((nHex - 1) * 4 + dstPos >= 16) {
throw new IllegalArgumentException("(nHexs-1)*4+dstPos is greater or equal to than 16");
}
short out = dstInit;
for (int i = 0; i < nHex; i++) {
final int shift = i * 4 + dstPos;
final int bits = (0xf & hexDigitToInt(src.charAt(i + srcPos))) << shift;
final int mask = 0xf << shift;
out = (short) ((out & ~mask) | bits);
}
return out;
}
/**
* Converts an array of int into a long using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the int array to convert
* @param srcPos the position in {@code src}, in int unit, from where to start the
* conversion
* @param dstInit initial value of the destination long
* @param dstPos the position of the lsb, in bits, in the result long
* @param nInts the number of ints to convert
* @return a long containing the selected bits
* @throws IllegalArgumentException if {@code (nInts-1)*32+dstPos >= 64}
* @throws NullPointerException if {@code src} is {@code null}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nInts > src.length}
*/
public static long intArrayToLong(final int[] src, final int srcPos, final long dstInit, final int dstPos,
final int nInts) {
if (src.length == 0 && srcPos == 0 || 0 == nInts) {
return dstInit;
}
if ((nInts - 1) * 32 + dstPos >= 64) {
throw new IllegalArgumentException("(nInts-1)*32+dstPos is greater or equal to than 64");
}
long out = dstInit;
for (int i = 0; i < nInts; i++) {
final int shift = i * 32 + dstPos;
final long bits = (0xffffffffL & src[i + srcPos]) << shift;
final long mask = 0xffffffffL << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts an int into an array of boolean using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the int to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBools the number of booleans to copy to {@code dst}, must be smaller or equal to
* the width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+srcPos >= 32}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBools > dst.length}
*/
public static boolean[] intToBinary(final int src, final int srcPos, final boolean[] dst, final int dstPos,
final int nBools) {
if (0 == nBools) {
return dst;
}
if (nBools - 1 + srcPos >= 32) {
throw new IllegalArgumentException("nBools-1+srcPos is greater or equal to than 32");
}
for (int i = 0; i < nBools; i++) {
final int shift = i + srcPos;
dst[dstPos + i] = (0x1 & (src >> shift)) != 0;
}
return dst;
}
/**
* Converts an int into an array of byte using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the int to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBytes the number of bytes to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code (nBytes-1)*8+srcPos >= 32}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBytes > dst.length}
*/
public static byte[] intToByteArray(final int src, final int srcPos, final byte[] dst, final int dstPos,
final int nBytes) {
if (0 == nBytes) {
return dst;
}
if ((nBytes - 1) * 8 + srcPos >= 32) {
throw new IllegalArgumentException("(nBytes-1)*8+srcPos is greater or equal to than 32");
}
for (int i = 0; i < nBytes; i++) {
final int shift = i * 8 + srcPos;
dst[dstPos + i] = (byte) (0xff & (src >> shift));
}
return dst;
}
/**
* Converts an int into an array of Char using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the int to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dstInit the initial value for the result String
* @param dstPos the position in {@code dst} where to copy the result
* @param nHexs the number of Chars to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws IllegalArgumentException if {@code (nHexs-1)*4+srcPos >= 32}
* @throws StringIndexOutOfBoundsException if {@code dst.init.length() < dstPos}
*/
public static String intToHex(final int src, final int srcPos, final String dstInit, final int dstPos,
final int nHexs) {
if (0 == nHexs) {
return dstInit;
}
if ((nHexs - 1) * 4 + srcPos >= 32) {
throw new IllegalArgumentException("(nHexs-1)*4+srcPos is greater or equal to than 32");
}
final StringBuilder sb = new StringBuilder(dstInit);
int append = sb.length();
for (int i = 0; i < nHexs; i++) {
final int shift = i * 4 + srcPos;
final int bits = 0xF & (src >> shift);
if (dstPos + i == append) {
++append;
sb.append(intToHexDigit(bits));
} else {
sb.setCharAt(dstPos + i, intToHexDigit(bits));
}
}
return sb.toString();
}
/**
* Converts the 4 lsb of an int to a hexadecimal digit.
*
*
* 0 returns '0'
*
*
* 1 returns '1'
*
*
* 10 returns 'A' and so on...
*
*
* @param nibble the 4 bits to convert
* @return a hexadecimal digit representing the 4 lsb of {@code nibble}
* @throws IllegalArgumentException if {@code nibble < 0} or {@code nibble > 15}
*/
public static char intToHexDigit(final int nibble) {
final char c = Character.forDigit(nibble, 16);
if (c == Character.MIN_VALUE) {
throw new IllegalArgumentException("nibble value not between 0 and 15: " + nibble);
}
return c;
}
/**
* Converts the 4 lsb of an int to a hexadecimal digit encoded using the Msb0 bit ordering.
*
*
* 0 returns '0'
*
*
* 1 returns '8'
*
*
* 10 returns '5' and so on...
*
*
* @param nibble the 4 bits to convert
* @return a hexadecimal digit representing the 4 lsb of {@code nibble}
* @throws IllegalArgumentException if {@code nibble < 0} or {@code nibble > 15}
*/
public static char intToHexDigitMsb0(final int nibble) {
switch (nibble) {
case 0x0:
return '0';
case 0x1:
return '8';
case 0x2:
return '4';
case 0x3:
return 'c';
case 0x4:
return '2';
case 0x5:
return 'a';
case 0x6:
return '6';
case 0x7:
return 'e';
case 0x8:
return '1';
case 0x9:
return '9';
case 0xA:
return '5';
case 0xB:
return 'd';
case 0xC:
return '3';
case 0xD:
return 'b';
case 0xE:
return '7';
case 0xF:
return 'f';
default:
throw new IllegalArgumentException("nibble value not between 0 and 15: " + nibble);
}
}
/**
* Converts an int into an array of short using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the int to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nShorts the number of shorts to copy to {@code dst}, must be smaller or equal to
* the width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code (nShorts-1)*16+srcPos >= 32}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nShorts > dst.length}
*/
public static short[] intToShortArray(final int src, final int srcPos, final short[] dst, final int dstPos,
final int nShorts) {
if (0 == nShorts) {
return dst;
}
if ((nShorts - 1) * 16 + srcPos >= 32) {
throw new IllegalArgumentException("(nShorts-1)*16+srcPos is greater or equal to than 32");
}
for (int i = 0; i < nShorts; i++) {
final int shift = i * 16 + srcPos;
dst[dstPos + i] = (short) (0xffff & (src >> shift));
}
return dst;
}
/**
* Converts a long into an array of boolean using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the long to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBools the number of booleans to copy to {@code dst}, must be smaller or equal to
* the width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+srcPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBools > dst.length}
*/
public static boolean[] longToBinary(final long src, final int srcPos, final boolean[] dst, final int dstPos,
final int nBools) {
if (0 == nBools) {
return dst;
}
if (nBools - 1 + srcPos >= 64) {
throw new IllegalArgumentException("nBools-1+srcPos is greater or equal to than 64");
}
for (int i = 0; i < nBools; i++) {
final int shift = i + srcPos;
dst[dstPos + i] = (0x1 & (src >> shift)) != 0;
}
return dst;
}
/**
* Converts a long into an array of byte using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the long to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBytes the number of bytes to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code (nBytes-1)*8+srcPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBytes > dst.length}
*/
public static byte[] longToByteArray(final long src, final int srcPos, final byte[] dst, final int dstPos,
final int nBytes) {
if (0 == nBytes) {
return dst;
}
if ((nBytes - 1) * 8 + srcPos >= 64) {
throw new IllegalArgumentException("(nBytes-1)*8+srcPos is greater or equal to than 64");
}
for (int i = 0; i < nBytes; i++) {
final int shift = i * 8 + srcPos;
dst[dstPos + i] = (byte) (0xff & (src >> shift));
}
return dst;
}
/**
* Converts a long into an array of Char using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the long to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dstInit the initial value for the result String
* @param dstPos the position in {@code dst} where to copy the result
* @param nHexs the number of Chars to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws IllegalArgumentException if {@code (nHexs-1)*4+srcPos >= 64}
* @throws StringIndexOutOfBoundsException if {@code dst.init.length() < dstPos}
*/
public static String longToHex(final long src, final int srcPos, final String dstInit, final int dstPos,
final int nHexs) {
if (0 == nHexs) {
return dstInit;
}
if ((nHexs - 1) * 4 + srcPos >= 64) {
throw new IllegalArgumentException("(nHexs-1)*4+srcPos is greater or equal to than 64");
}
final StringBuilder sb = new StringBuilder(dstInit);
int append = sb.length();
for (int i = 0; i < nHexs; i++) {
final int shift = i * 4 + srcPos;
final int bits = (int) (0xF & (src >> shift));
if (dstPos + i == append) {
++append;
sb.append(intToHexDigit(bits));
} else {
sb.setCharAt(dstPos + i, intToHexDigit(bits));
}
}
return sb.toString();
}
/**
* Converts a long into an array of int using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the long to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nInts the number of ints to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null} and {@code nInts > 0}
* @throws IllegalArgumentException if {@code (nInts-1)*32+srcPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nInts > dst.length}
*/
public static int[] longToIntArray(final long src, final int srcPos, final int[] dst, final int dstPos,
final int nInts) {
if (0 == nInts) {
return dst;
}
if ((nInts - 1) * 32 + srcPos >= 64) {
throw new IllegalArgumentException("(nInts-1)*32+srcPos is greater or equal to than 64");
}
for (int i = 0; i < nInts; i++) {
final int shift = i * 32 + srcPos;
dst[dstPos + i] = (int) (0xffffffff & (src >> shift));
}
return dst;
}
/**
* Converts a long into an array of short using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the long to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nShorts the number of shorts to copy to {@code dst}, must be smaller or equal to
* the width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code (nShorts-1)*16+srcPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nShorts > dst.length}
*/
public static short[] longToShortArray(final long src, final int srcPos, final short[] dst, final int dstPos,
final int nShorts) {
if (0 == nShorts) {
return dst;
}
if ((nShorts - 1) * 16 + srcPos >= 64) {
throw new IllegalArgumentException("(nShorts-1)*16+srcPos is greater or equal to than 64");
}
for (int i = 0; i < nShorts; i++) {
final int shift = i * 16 + srcPos;
dst[dstPos + i] = (short) (0xffff & (src >> shift));
}
return dst;
}
/**
* Converts an array of short into an int using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the short array to convert
* @param srcPos the position in {@code src}, in short unit, from where to start the
* conversion
* @param dstInit initial value of the destination int
* @param dstPos the position of the lsb, in bits, in the result int
* @param nShorts the number of shorts to convert
* @return an int containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code (nShorts-1)*16+dstPos >= 32}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nShorts > src.length}
*/
public static int shortArrayToInt(final short[] src, final int srcPos, final int dstInit, final int dstPos,
final int nShorts) {
if (src.length == 0 && srcPos == 0 || 0 == nShorts) {
return dstInit;
}
if ((nShorts - 1) * 16 + dstPos >= 32) {
throw new IllegalArgumentException("(nShorts-1)*16+dstPos is greater or equal to than 32");
}
int out = dstInit;
for (int i = 0; i < nShorts; i++) {
final int shift = i * 16 + dstPos;
final int bits = (0xffff & src[i + srcPos]) << shift;
final int mask = 0xffff << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts an array of short into a long using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the short array to convert
* @param srcPos the position in {@code src}, in short unit, from where to start the
* conversion
* @param dstInit initial value of the destination long
* @param dstPos the position of the lsb, in bits, in the result long
* @param nShorts the number of shorts to convert
* @return a long containing the selected bits
* @throws NullPointerException if {@code src} is {@code null}
* @throws IllegalArgumentException if {@code (nShorts-1)*16+dstPos >= 64}
* @throws ArrayIndexOutOfBoundsException if {@code srcPos + nShorts > src.length}
*/
public static long shortArrayToLong(final short[] src, final int srcPos, final long dstInit, final int dstPos,
final int nShorts) {
if (src.length == 0 && srcPos == 0 || 0 == nShorts) {
return dstInit;
}
if ((nShorts - 1) * 16 + dstPos >= 64) {
throw new IllegalArgumentException("(nShorts-1)*16+dstPos is greater or equal to than 64");
}
long out = dstInit;
for (int i = 0; i < nShorts; i++) {
final int shift = i * 16 + dstPos;
final long bits = (0xffffL & src[i + srcPos]) << shift;
final long mask = 0xffffL << shift;
out = (out & ~mask) | bits;
}
return out;
}
/**
* Converts a short into an array of boolean using the default (little endian, Lsb0) byte
* and bit ordering.
*
* @param src the short to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBools the number of booleans to copy to {@code dst}, must be smaller or equal to
* the width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code nBools-1+srcPos >= 16}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBools > dst.length}
*/
public static boolean[] shortToBinary(final short src, final int srcPos, final boolean[] dst, final int dstPos,
final int nBools) {
if (0 == nBools) {
return dst;
}
if (nBools - 1 + srcPos >= 16) {
throw new IllegalArgumentException("nBools-1+srcPos is greater or equal to than 16");
}
assert (nBools - 1) < 16 - srcPos;
for (int i = 0; i < nBools; i++) {
final int shift = i + srcPos;
dst[dstPos + i] = (0x1 & (src >> shift)) != 0;
}
return dst;
}
/**
* Converts a short into an array of byte using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the short to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBytes the number of bytes to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code (nBytes-1)*8+srcPos >= 16}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBytes > dst.length}
*/
public static byte[] shortToByteArray(final short src, final int srcPos, final byte[] dst, final int dstPos,
final int nBytes) {
if (0 == nBytes) {
return dst;
}
if ((nBytes - 1) * 8 + srcPos >= 16) {
throw new IllegalArgumentException("(nBytes-1)*8+srcPos is greater or equal to than 16");
}
for (int i = 0; i < nBytes; i++) {
final int shift = i * 8 + srcPos;
dst[dstPos + i] = (byte) (0xff & (src >> shift));
}
return dst;
}
/**
* Converts a short into an array of Char using the default (little endian, Lsb0) byte and
* bit ordering.
*
* @param src the short to convert
* @param srcPos the position in {@code src}, in bits, from where to start the conversion
* @param dstInit the initial value for the result String
* @param dstPos the position in {@code dst} where to copy the result
* @param nHexs the number of Chars to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws IllegalArgumentException if {@code (nHexs-1)*4+srcPos >= 16}
* @throws StringIndexOutOfBoundsException if {@code dst.init.length() < dstPos}
*/
public static String shortToHex(final short src, final int srcPos, final String dstInit, final int dstPos,
final int nHexs) {
if (0 == nHexs) {
return dstInit;
}
if ((nHexs - 1) * 4 + srcPos >= 16) {
throw new IllegalArgumentException("(nHexs-1)*4+srcPos is greater or equal to than 16");
}
final StringBuilder sb = new StringBuilder(dstInit);
int append = sb.length();
for (int i = 0; i < nHexs; i++) {
final int shift = i * 4 + srcPos;
final int bits = 0xF & (src >> shift);
if (dstPos + i == append) {
++append;
sb.append(intToHexDigit(bits));
} else {
sb.setCharAt(dstPos + i, intToHexDigit(bits));
}
}
return sb.toString();
}
/**
* Converts UUID into an array of byte using the default (little endian, Lsb0) byte and bit
* ordering.
*
* @param src the UUID to convert
* @param dst the destination array
* @param dstPos the position in {@code dst} where to copy the result
* @param nBytes the number of bytes to copy to {@code dst}, must be smaller or equal to the
* width of the input (from srcPos to msb)
* @return {@code dst}
* @throws NullPointerException if {@code dst} is {@code null}
* @throws IllegalArgumentException if {@code nBytes > 16}
* @throws ArrayIndexOutOfBoundsException if {@code dstPos + nBytes > dst.length}
*/
public static byte[] uuidToByteArray(final UUID src, final byte[] dst, final int dstPos, final int nBytes) {
if (0 == nBytes) {
return dst;
}
if (nBytes > 16) {
throw new IllegalArgumentException("nBytes is greater than 16");
}
longToByteArray(src.getMostSignificantBits(), 0, dst, dstPos, Math.min(nBytes, 8));
if (nBytes >= 8) {
longToByteArray(src.getLeastSignificantBits(), 0, dst, dstPos + 8, nBytes - 8);
}
return dst;
}
}
