ByteUtils.java
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package fi.codecrew.moya.utilities;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* Copyright Iudex / Tuomas Riihimäki
*
*/
public class ByteUtils {
public static int parseUnsigned(byte... b) {
if (b.length > 4) {
throw new RuntimeException("Integer should never have more than 4 bytes!");
}
return new BigInteger(1, b).intValue();
}
public static Long parseUnsignedLong(byte[] b) {
if (b.length > 8) {
throw new RuntimeException("Long should never have more than 4 bytes!");
}
return new BigInteger(1, b).longValue();
}
public static short parseSigned(byte b0, byte b1) {
return (short) (((b0 & 0xff) << 8) | (b1 & 0xff));
}
public static Integer parseSignedO(byte b, byte c) {
return Integer.valueOf(parseSigned(b, c));
}
public static Integer parseSigned(byte b1, byte b2, byte b3, byte b4) {
return (b1 & 0xff) << 24 | (b2 & 0xff) << 16 | (b3 & 0xff) << 8 | (b4 & 0xff);
}
public static void main(String[] ads)
{
System.out.println(parseUnsigned((byte) 0x31, (byte) 0x79));
// System.out.println(parseSignedDecimal("+5.123"));
// System.out.println(parseSignedDecimal("-5.123"));
// System.out.println(parseSignedDecimal(" - 5123"));
// System.out.println(parseSignedDecimal(null));
// System.out.println(parseSignedDecimal(""));
// System.out.println(parseSignedDecimal(" "));
}
public static BigDecimal parseSignedDecimal(String number) {
if (number == null || (number = number.trim()).isEmpty()) {
return null;
}
number = number.trim();
char firstChar = number.charAt(0);
boolean signPositive = true;
switch (firstChar) {
case '-':
signPositive = false;
case '+':
number = number.substring(1).trim();
}
BigDecimal ret = new BigDecimal(number);
if (!signPositive) {
ret = ret.negate();
}
return ret;
}
// public static int parseSignedInt(byte... b) {
// if (b.length > 4) {
// throw new
// RuntimeException("Integer should never have more than 4 bytes!");
// }
// // return new BigInteger(1, b).intValue();
//
// int value = (b[b.length - 1] & 0xff);
// if (b.length > 1) {
// value |= (b[b.length - 2] & 0xff) << 8;
// }
// if (b.length > 2) {
// value |= (b[b.length - 3] & 0xff) << 16;
// }
// if (b.length > 3) {
// value |= (b[b.length - 4] & 0xff) << 24;
// }
// return value;
// }
/**
* Copies the integer value to four bytes in the destination bytearray beginning from the offset
*
* Notice! This function handles signed integers: -1 -> 0xff 0xff 0xff 0xff
*
* @param dst
* @param offset
* @param value
*/
public static void intToBytearray(byte[] dst, int offset, int value) {
dst[offset++] = (byte) (value >>> 24);
dst[offset++] = (byte) (value >>> 16);
dst[offset++] = (byte) (value >>> 8);
dst[offset] = (byte) (value);
}
public static byte[] toArray(int... bytes) {
byte[] ret = new byte[bytes.length];
for (int i = 0; i < bytes.length; ++i) {
ret[i] = (byte) (bytes[i]);
}
return ret;
}
public static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
int val = ((int) b) & 0xff;
if (val < 0x10)
sb.append("0");
sb.append(Integer.toHexString(val));
}
return sb.toString();
}
}