ByteUtils.java
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package cn.org.hentai.jtt1078.util;
/**
* Created by matrixy on 2017/8/22.
*/
public final class ByteUtils
{
public static byte[] parse(String hexString)
{
String[] hexes = hexString.split(" ");
byte[] data = new byte[hexes.length];
for (int i = 0; i < hexes.length; i++) data[i] = (byte)(Integer.parseInt(hexes[i], 16) & 0xff);
return data;
}
public static synchronized void dump(byte[] data)
{
dump(data, data.length);
}
public static synchronized void dump(byte[] data, int len)
{
for (int i = 0, l = len; i < l && i < data.length; )
{
String ascii = "";
int k = 0, f = 0;
for (; k < 16 && k < data.length; k++)
{
if (k + i < l)
{
f++;
byte d = data[i + k];
String hex = Integer.toHexString(d & 0xff).toUpperCase();
if (hex.length() == 1) hex = "0" + hex;
if (d >= 0x20 && d < 127) ascii += (char)d;
else ascii += '.';
System.out.print(hex);
}
else
{
System.out.print(' ');
System.out.print(' ');
}
if (k % 4 == 3) System.out.print(" ");
else System.out.print(' ');
}
i += f;
System.out.println(ascii);
}
}
public static String toString(byte[] data)
{
if (null == data) return "";
return toString(data, data.length);
}
public static String toString(byte[] buff, int length)
{
StringBuffer sb = new StringBuffer(length * 2);
for (int i = 0; i < buff.length && i < length; i++)
{
if ((buff[i] & 0xff) < 0x10) sb.append('0');
sb.append(Integer.toHexString(buff[i] & 0xff).toUpperCase());
sb.append(' ');
}
return sb.toString();
}
public static boolean getBit(int val, int pos)
{
return getBit(new byte[] {
(byte)((val >> 0) & 0xff),
(byte)((val >> 8) & 0xff),
(byte)((val >> 16) & 0xff),
(byte)((val >> 24) & 0xff)
}, pos);
}
public static int reverse(int val)
{
byte[] bytes = toBytes(val);
byte[] ret = new byte[4];
for (int i = 0; i < 4; i++) ret[i] = bytes[3 - i];
return toInt(ret);
}
public static byte[] toLEBytes(int val)
{
byte[] bytes = new byte[4];
for (int i = 0; i < 4; i++)
{
bytes[3 - i] = (byte)(val >> ((3 - i) * 8) & 0xff);
}
return bytes;
}
public static byte[] toLEBytes(short s)
{
byte[] bytes = new byte[2];
bytes[0] = (byte)(s & 0xff);
bytes[1] = (byte)((s >> 8) & 0xff);
return bytes;
}
public static int toInt(byte[] bytes)
{
int val = 0;
for (int i = 0; i < 4; i++) val |= (bytes[i] & 0xff) << ((3 - i) * 8);
return val;
}
public static byte[] toBytes(int val)
{
byte[] bytes = new byte[4];
for (int i = 0; i < 4; i++)
{
bytes[i] = (byte)(val >> ((3 - i) * 8) & 0xff);
}
return bytes;
}
public static byte[] toBytes(long val)
{
byte[] bytes = new byte[8];
for (int i = 0; i < 8; i++)
{
bytes[i] = (byte)(val >> ((7 - i) * 8) & 0xff);
}
return bytes;
}
public static int getInt(byte[] data, int offset, int length)
{
int val = 0;
for (int i = 0; i < length; i++) val |= (data[offset + i] & 0xff) << ((length - i - 1) * 8);
return val;
}
public static long getLong(byte[] data, int offset, int length)
{
long val = 0;
for (int i = 0; i < length; i++) val |= ((long)data[offset + i] & 0xff) << ((length - i - 1) * 8);
return val;
}
public static boolean getBit(byte[] data, int pos)
{
return ((data[pos / 8] >> (pos % 8)) & 0x01) == 0x01;
}
public static byte[] concat(byte[]...byteArrays)
{
int len = 0, index = 0;
for (int i = 0; i < byteArrays.length; i++) len += byteArrays[i].length;
byte[] buff = new byte[len];
for (int i = 0; i < byteArrays.length; i++)
{
System.arraycopy(byteArrays[i], 0, buff, index, byteArrays[i].length);
index += byteArrays[i].length;
}
return buff;
}
public static boolean compare(byte[] data1, byte[] data2)
{
if (data1.length != data2.length) return false;
for (int i = 0; i < data1.length; i++)
if ((data1[i] & 0xff) != (data2[i] & 0xff)) return false;
return true;
}
// 相当于(short *) byte_pointer的效果
public static short[] toShortArray(byte[] src)
{
short[] dst = new short[src.length / 2];
for (int i = 0, k = 0; i < src.length; )
{
dst[k++] = (short)((src[i++] & 0xff) | ((src[i++] & 0xff) << 8));
}
return dst;
}
// 相当于(char *) short_pointer的效果
public static byte[] toByteArray(short[] src)
{
byte[] dst = new byte[src.length * 2];
for (int i = 0, k = 0; i < src.length; i++)
{
dst[k++] = (byte)(src[i] & 0xff);
dst[k++] = (byte)((src[i] >> 8) & 0xff);
}
return dst;
}
}