/*
 * Created on Oct 18, 2005
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package org.apache.bcel;

/**
 * @author dorina
 * 
 * TODO To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Style - Code Templates
 */
public abstract class SignatureConstants {

	//public final static byte SIMPLE_CODIFICATION = 0x01;
	public final static byte CODIF_4B = 0x01;
	
	//public final static byte DOUBLE_CODIFICATION = 0x02;
	public final static byte CODIF_8B = 0x02;
	
	public final static byte CODIF_6B = 0x04;
	
	public final static byte CODIF_14B = 0x08;

	public final static byte ERROR_CODIFICATION = 0x05;

	
	/**
	 * used to specified if a the codification it's a new signature, or it contains only the links missing from the previous signature
	 * 
	 */
	public final static byte ACC_NEW_SIGNATURE = 0x10;
	
	/** number of bytes used to specify 
	 * 		the length of an multiobject, 
	 *  	
	 */ 
	public final static int MULTIOBJECT_LENGTH_SIZE = 1;

	/** number of bytes used to specify 
	 * 		the length of the stack and local variables, 
	 *  	
	 */ 
	public final static int STACK_LENGTH_SIZE = 1;

	/**
	 * 
	 * 
	 */
	public final static int JVMTYPE_SIZE = 2;
	
	public final static int CSTPOOL_SIZE = 2;
	
	/** number of bytes used to specify 
	 * 			the height of stack
	 * 			total size of a frame
	 * 			number of external methods
	 */
	public final static int TOTAL_LENGTH_SIZE = 2;
	
	/**
	 * number of byte used to specify
	 *		number of labels in a method
	 * 		the label (number of order) of a bytecode
	 */
	public final static int LABEL_BYTECODE_SIZE = 2;
	
	public static byte[] toByteArray(int foo) {
		return toByteArray(foo, 4);
	}

	public static byte[] toByteArray(int foo, int size) {
		byte[] array = new byte[size];
		for (int iInd = 0; iInd < array.length; ++iInd) {
			array[iInd] = (byte) ((foo >> (iInd * 8)));
		}
		return array;
	}
	
	/*
	 * reads an int represented on <code>size</code> bytes from array,
	 * starting at position <code>index</code>
	 */
	public static int readInt(byte[]array, int index, int size){
		int a = 0;
		for(int i = index; i < size+index; i++) {
			int b = array[i];
			if(b < 0) b += 256;
			a = a + (b << 8*(i-index));
		}
		return a;
	}
}