package xapi.util;
public class X_Byte {
private X_Byte() {}
/**
* Reads an unsigned 16bit integer at the index.
*/
public static int readU16bit(byte[] code, int index) {
return ((code[index] & 0xff) << 8) | (code[index + 1] & 0xff);
}
/**
* Reads a signed 16bit integer at the index.
*/
public static int readS16bit(byte[] code, int index) {
return (code[index] << 8) | (code[index + 1] & 0xff);
}
/**
* Writes a 16bit integer at the index.
*/
public static void write16bit(int value, byte[] code, int index) {
code[index] = (byte)(value >>> 8);
code[index + 1] = (byte)value;
}
/**
* Reads a 32bit integer at the index.
*/
public static int read32bit(byte[] code, int index) {
return (code[index] << 24) | ((code[index + 1] & 0xff) << 16)
| ((code[index + 2] & 0xff) << 8) | (code[index + 3] & 0xff);
}
/**
* Writes a 32bit integer at the index.
*/
public static void write32bit(int value, byte[] code, int index) {
code[index] = (byte)(value >>> 24);
code[index + 1] = (byte)(value >>> 16);
code[index + 2] = (byte)(value >>> 8);
code[index + 3] = (byte)value;
}
/**
* Copies a 32bit integer.
*
* @param src the source byte array.
* @param isrc the index into the source byte array.
* @param dest the destination byte array.
* @param idest the index into the destination byte array.
*/
public static void copy32bit(byte[] src, int isrc, byte[] dest, int idest) {
dest[idest] = src[isrc];
dest[idest + 1] = src[isrc + 1];
dest[idest + 2] = src[isrc + 2];
dest[idest + 3] = src[isrc + 3];
}
}