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executable file
·166 lines (152 loc) · 4.26 KB
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package javaforce;
/**
* Little Endian get/set functions.
*
* Usage : Windows files, Intel CPU style, etc.
*
* Could use java.nio.ByteBuffer but sometimes this is faster.
*
* Created : Dec 5, 2013
*/
public class LE {
public static int getuint8(byte[] data, int offset) {
int ret;
ret = (int)data[offset] & 0xff;
return ret;
}
public static int getuint16(byte[] data, int offset) {
int ret;
ret = data[offset] & 0xff;
ret += (data[offset+1] & 0xff) << 8;
return ret;
}
public static int getuint32(byte[] data, int offset) {
int ret;
ret = (int)data[offset] & 0xff;
ret += ((int)data[offset+1] & 0xff) << 8;
ret += ((int)data[offset+2] & 0xff) << 16;
ret += ((int)data[offset+3] & 0xff) << 24;
return ret;
}
public static long getuint64(byte[] data, int offset) {
long ret;
ret = (long)data[offset] & 0xff;
ret += ((long)data[offset+1] & 0xff) << 8;
ret += ((long)data[offset+2] & 0xff) << 16;
ret += ((long)data[offset+3] & 0xff) << 24;
ret += ((long)data[offset+4] & 0xff) << 32;
ret += ((long)data[offset+5] & 0xff) << 40;
ret += ((long)data[offset+6] & 0xff) << 48;
ret += ((long)data[offset+7] & 0xff) << 56;
return ret;
}
public static String getString(byte[] data, int offset, int len) {
String ret = "";
while (len > 0) {
if (data[offset]==0) break;
ret += (char)data[offset++];
len--;
}
return ret;
}
public static void setuint8(byte[] data, int offset, int num) {
data[offset] = (byte)(num & 0xff);
}
public static void setuint16(byte[] data, int offset, int num) {
data[offset+0] = (byte)(num & 0xff);
num >>= 8;
data[offset+1] = (byte)(num & 0xff);
}
public static void setuint32(byte[] data, int offset, int num) {
data[offset+0] = (byte)(num & 0xff);
num >>= 8;
data[offset+1] = (byte)(num & 0xff);
num >>= 8;
data[offset+2] = (byte)(num & 0xff);
num >>= 8;
data[offset+3] = (byte)(num & 0xff);
}
public static void setuint64(byte[] data, int offset, long num) {
data[offset+0] = (byte)(num & 0xff);
num >>= 8;
data[offset+1] = (byte)(num & 0xff);
num >>= 8;
data[offset+2] = (byte)(num & 0xff);
num >>= 8;
data[offset+3] = (byte)(num & 0xff);
num >>= 8;
data[offset+4] = (byte)(num & 0xff);
num >>= 8;
data[offset+5] = (byte)(num & 0xff);
num >>= 8;
data[offset+6] = (byte)(num & 0xff);
num >>= 8;
data[offset+7] = (byte)(num & 0xff);
}
public static void setString(byte[] data, int offset, int len, String str) {
int pos = 0;
while (len > 0) {
if (pos >= str.length()) {
data[offset++] = 0;
} else {
data[offset++] = (byte)str.charAt(pos++);
}
len--;
}
}
//Using arrays are 40% faster than using java.nio.ByteBuffer
public static short[] byteArray2shortArray(byte in[], short out[]) {
int len = in.length / 2;
if (out == null) out = new short[len];
int p = 0;
short val;
for (int a = 0; a < len; a++) {
val = (short)(in[p++] & 0xff);
val += (in[p++] & 0xff) << 8;
out[a] = val;
}
return out;
}
public static int[] byteArray2intArray(byte in[], int out[]) {
int len = in.length / 4;
if (out == null) out = new int[len];
int p = 0;
int val;
for (int a = 0; a < len; a++) {
val = (in[p++] & 0xff);
val += (in[p++] & 0xff) << 8;
val += (in[p++] & 0xff) << 16;
val += (in[p++] & 0xff) << 24;
out[a] = val;
}
return out;
}
public static byte[] shortArray2byteArray(short in[], byte out[]) {
int len = in.length;
if (out == null) out = new byte[len * 2];
int p = 0;
short val;
for (int a = 0; a < len; a++) {
val = in[a];
out[p++] = (byte) (val & 0xff);
out[p++] = (byte) (val >>> 8);
}
return out;
}
public static byte[] intArray2byteArray(int in[], byte out[]) {
int len = in.length;
if (out == null) out = new byte[len * 4];
int p = 0;
int val;
for (int a = 0; a < len; a++) {
val = in[a];
out[p++] = (byte) (val & 0xff);
val >>>= 8;
out[p++] = (byte) (val & 0xff);
val >>>= 8;
out[p++] = (byte) (val & 0xff);
out[p++] = (byte) (val >>> 8);
}
return out;
}
}