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/*
* Copyright (c) 2017 - 2019, SmartDeviceLink Consortium, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of the SmartDeviceLink Consortium, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.smartdevicelink.util;
public class BitConverter {
/**
* @param bytes byte array that will be converted to hex
* @return the String containing converted hex values or null if byte array is null
*/
public static String bytesToHex(byte[] bytes) {
if (bytes == null) {
return null;
}
return bytesToHex(bytes, 0, bytes.length);
} // end-method
/**
* @param bytes byte array that will be converted to hex
* @param offset int representing the offset to begin conversion at
* @param length int representing number of bytes in array to convert
* @return the String containing converted hex values or null if byte array is null,
* a null value if byte array is null,
* and an empty string if the offset is greater than the length
*/
public static String bytesToHex(byte[] bytes, int offset, int length) {
if (bytes == null) {
return null;
}
if (offset > bytes.length) {
return "";
}
final char[] HexDigits = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
byte b;
char[] hexChars = new char[2 * length];
//StringBuffer sb = new StringBuffer();
int upperBound = Math.min(bytes.length, (offset + length));
int baidx = 0;
int sidx = 0;
for (baidx = offset; baidx < upperBound; baidx++) {
// Get the byte from the array
b = bytes[baidx];
// Use nibbles as index into hex digit array (left nibble, then right)
hexChars[sidx++] = HexDigits[(b & 0xf0) >> 4];
hexChars[sidx++] = HexDigits[(b & 0x0f)];
} // end-for
return new String(hexChars);
} // end-method
/**
* @param hexString the String containing converted hex values
* @return byte array converted from input String or null if String is null
*/
public static byte[] hexToBytes(String hexString) {
if (hexString == null) {
return null;
}
if (hexString.length() % 2 != 0) {
hexString = "0" + hexString;
}
byte[] theBytes = new byte[hexString.length() / 2];
for (int i = 0; i < hexString.length(); i += 2) {
String byteString = hexString.substring(i, i + 2);
byte theByte = (byte) Integer.parseInt(byteString, 16);
theBytes[i / 2] = theByte;
}
return theBytes;
} // end-method
public static final byte[] intToByteArray(int value) {
return new byte[]{
(byte) (value >>> 24),
(byte) (value >>> 16),
(byte) (value >>> 8),
(byte) value};
}
/**
* @param sizeBuf byte array that will be converted to int
* @param offset The position indicating where to begin converting.
* @return int converted from byte array,
* -1 if byte array is null,
* and 0 if the offset is greater than the length of the byte array
*/
public static int intFromByteArray(byte[] sizeBuf, int offset) {
if (sizeBuf == null) {
return -1;
}
if (offset > sizeBuf.length) {
return 0;
}
int ret = 0;
for (int i = offset; i < offset + 4; i++) {
ret <<= 8;
ret |= 0xFF & sizeBuf[i];
}
return ret;
}
public static final byte[] shortToByteArray(short value) {
return new byte[]{
(byte) (value >>> 8),
(byte) value};
}
/**
* @param sizeBuf byte array that will be converted to short
* @param offset The position indicating where to begin converting.
* @return short converted from byte array,
* -1 if byte array is null,
* and 0 if the offset is greater than the length of the byte array
*/
public static short shortFromByteArray(byte[] sizeBuf, int offset) {
if (sizeBuf == null) {
return -1;
}
if (offset > sizeBuf.length) {
return 0;
}
short ret = 0;
for (int i = offset; i < offset + 2; i++) {
ret <<= 8;
ret |= 0xFF & sizeBuf[i];
}
return ret;
}
/**
* Converts the byte array into a string of hex values.
*
* @param bytes byte array that will be converted to hex
* @param end EXCLUSIVE so if it receives 10 it will print 0-9
* @return the String containing converted hex values or null if byte array is null
*/
public static String bytesToHex(byte[] bytes, int end) {
if (bytes == null) {
return null;
}
if (bytes.length < end) {
end = bytes.length;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < end; i++) {
sb.append(" ");
sb.append(String.format("%02X ", bytes[i]));
}
return sb.toString();
}
}
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