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package cz.crcs.ectester.common.util;
/**
* Utility class, some byte/hex manipulation, convenient byte[] methods.
*
* @author Petr Svenda petr@svenda.com
* @author Jan Jancar johny@neuromancer.sk
*/
public class ByteUtil {
/**
* Gen a short from a byte array at <code>offset</code>, big-endian.
*
* @return the short value
*/
public static short getShort(byte[] array, int offset) {
return (short) (((array[offset] & 0xFF) << 8) | (array[offset + 1] & 0xFF));
}
/**
* Set a short in a byte array at <code>offset</code>, big-endian.
*/
public static void setShort(byte[] array, int offset, short value) {
array[offset + 1] = (byte) (value & 0xFF);
array[offset] = (byte) ((value >> 8) & 0xFF);
}
/**
* Compare two byte arrays upto <code>length</code> and get first difference.
*
* @return the position of the first difference in the two byte arrays, or <code>length</code> if they are equal.
*/
public static int diffBytes(byte[] one, int oneOffset, byte[] other, int otherOffset, int length) {
for (int i = 0; i < length; ++i) {
byte a = one[i + oneOffset];
byte b = other[i + otherOffset];
if (a != b) {
return i;
}
}
return length;
}
/**
* Compare two byte arrays, upto <code>length</code>.
*
* @return whether the arrays are equal upto <code>length</code>
*/
public static boolean compareBytes(byte[] one, int oneOffset, byte[] other, int otherOffset, int length) {
return diffBytes(one, oneOffset, other, otherOffset, length) == length;
}
/**
* Test if the byte array has all values equal to <code>value</code>.
*/
public static boolean allValue(byte[] array, byte value) {
for (byte a : array) {
if (a != value)
return false;
}
return true;
}
public static byte[] shortToBytes(short value) {
byte[] result = new byte[2];
setShort(result, 0, value);
return result;
}
public static byte[] shortToBytes(short[] shorts) {
if (shorts == null) {
return null;
}
byte[] result = new byte[shorts.length * 2];
for (int i = 0; i < shorts.length; ++i) {
setShort(result, 2 * i, shorts[i]);
}
return result;
}
/**
* Parse a hex string into a byte array, big-endian.
*
* @param hex The String to parse.
* @return the byte array from the hex string.
*/
public static byte[] hexToBytes(String hex) {
return hexToBytes(hex, true);
}
/**
* Parse a hex string into a byte-array, specify endianity.
*
* @param hex The String to parse.
* @param bigEndian Whether to parse as big-endian.
* @return the byte array from the hex string.
*/
public static byte[] hexToBytes(String hex, boolean bigEndian) {
hex = hex.replace(" ", "");
int len = hex.length();
StringBuilder sb = new StringBuilder();
if (len % 2 == 1) {
sb.append("0");
++len;
}
if (bigEndian) {
sb.append(hex);
} else {
for (int i = 0; i < len / 2; ++i) {
if (sb.length() >= 2) {
sb.insert(sb.length() - 2, hex.substring(2 * i, 2 * i + 2));
} else {
sb.append(hex.substring(2 * i, 2 * i + 2));
}
}
}
String data = sb.toString();
byte[] result = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
result[i / 2] = (byte) ((Character.digit(data.charAt(i), 16) << 4)
+ (Character.digit(data.charAt(i + 1), 16)));
}
return result;
}
public static String byteToHex(byte data) {
return String.format("%02x", data);
}
public static String bytesToHex(byte[] data) {
return bytesToHex(data, true);
}
public static String bytesToHex(byte[] data, boolean addSpace) {
if (data == null) {
return "";
}
return bytesToHex(data, 0, data.length, addSpace);
}
public static String bytesToHex(byte[] data, int offset, int len) {
return bytesToHex(data, offset, len, true);
}
public static String bytesToHex(byte[] data, int offset, int len, boolean addSpace) {
if (data == null) {
return "";
}
StringBuilder buf = new StringBuilder();
for (int i = offset; i < (offset + len); i++) {
buf.append(byteToHex(data[i]));
if (addSpace && i != (offset + len - 1)) {
buf.append(" ");
}
}
return (buf.toString());
}
public static byte[] concatenate(byte[]... arrays) {
int len = 0;
for (byte[] array : arrays) {
if (array == null)
continue;
len += array.length;
}
byte[] out = new byte[len];
int offset = 0;
for (byte[] array : arrays) {
if (array == null || array.length == 0)
continue;
System.arraycopy(array, 0, out, offset, array.length);
offset += array.length;
}
return out;
}
public static byte[] prependLength(byte[] data) {
return concatenate(ByteUtil.shortToBytes((short) data.length), data);
}
}
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