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	/*
	* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.security.jgss;

	import java.io.InputStream;
	import java.io.OutputStream;
	import java.io.IOException;
	import java.io.EOFException;
	import sun.security.util.*;

	/**
	* Utilities for processing GSS Tokens.
	*
	*/

	public abstract class GSSToken {

	/**
	* Copies an integer value to a byte array in little endian form.
	* @param value the integer value to write
	* @param array the byte array into which the integer must be copied. It
	* is assumed that the array will be large enough to hold the 4 bytes of
	* the integer.
	*/
	public static final void writeLittleEndian(int value, byte[] array) {
	writeLittleEndian(value, array, 0);
	}

	/**
	* Copies an integer value to a byte array in little endian form.
	* @param value the integer value to write
	* @param array the byte array into which the integer must be copied. It
	* is assumed that the array will be large enough to hold the 4 bytes of
	* the integer.
	* @param pos the position at which to start writing
	*/
	public static final void writeLittleEndian(int value, byte[] array,
	int pos) {
	array[pos++] = (byte)(value);
	array[pos++] = (byte)((value>>>8));
	array[pos++] = (byte)((value>>>16));
	array[pos++] = (byte)((value>>>24));
	}

	public static final void writeBigEndian(int value, byte[] array) {
	writeBigEndian(value, array, 0);
	}

	public static final void writeBigEndian(int value, byte[] array,
	int pos) {
	array[pos++] = (byte)((value>>>24));
	array[pos++] = (byte)((value>>>16));
	array[pos++] = (byte)((value>>>8));
	array[pos++] = (byte)(value);
	}

	/**
	* Reads an integer value from a byte array in little endian form. This
	* method allows the reading of two byte values as well as four bytes
	* values both of which are needed in the Kerberos v5 GSS-API mechanism.
	*
	* @param data the array containing the bytes of the integer value
	* @param pos the offset in the array
	* @param size the number of bytes to read from the array.
	* @return the integer value
	*/
	public static final int readLittleEndian(byte[] data, int pos, int size) {
	int retVal = 0;
	int shifter = 0;
	while (size > 0) {
	retVal += (data[pos] & 0xff) << shifter;
	shifter += 8;
	pos++;
	size--;
	}
	return retVal;
	}

	public static final int readBigEndian(byte[] data, int pos, int size) {
	int retVal = 0;
	int shifter = (size-1)*8;
	while (size > 0) {
	retVal += (data[pos] & 0xff) << shifter;
	shifter -= 8;
	pos++;
	size--;
	}
	return retVal;
	}

	/**
	* Writes a two byte integer value to a OutputStream.
	*
	* @param val the integer value. It will lose the high-order two bytes.
	* @param os the OutputStream to write to
	* @throws IOException if an error occurs while writing to the OutputStream
	*/
	public static final void writeInt(int val, OutputStream os)
	throws IOException {
	os.write(val>>>8);
	os.write(val);
	}

	/**
	* Writes a two byte integer value to a byte array.
	*
	* @param val the integer value. It will lose the high-order two bytes.
	* @param dest the byte array to write to
	* @param pos the offset to start writing to
	*/
	public static final int writeInt(int val, byte[] dest, int pos) {
	dest[pos++] = (byte)(val>>>8);
	dest[pos++] = (byte)val;
	return pos;
	}

	/**
	* Reads a two byte integer value from an InputStream.
	*
	* @param is the InputStream to read from
	* @return the integer value
	* @throws IOException if some errors occurs while reading the integer
	* bytes.
	*/
	public static final int readInt(InputStream is) throws IOException {
	return (((0xFF & is.read()) << 8)
	\| (0xFF & is.read()));
	}

	/**
	* Reads a two byte integer value from a byte array.
	*
	* @param src the byte arra to read from
	* @param pos the offset to start reading from
	* @return the integer value
	*/
	public static final int readInt(byte[] src, int pos) {
	return ((0xFF & src[pos])<<8 \| (0xFF & src[pos+1]));
	}

	/**
	* Blocks till the required number of bytes have been read from the
	* input stream.
	*
	* @param is the InputStream to read from
	* @param buffer the buffer to store the bytes into
	* @throws EOFException if EOF is reached before all bytes are
	* read.
	* @throws IOException is an error occurs while reading
	*/
	public static final void readFully(InputStream is, byte[] buffer)
	throws IOException {
	readFully(is, buffer, 0, buffer.length);
	}

	/**
	* Blocks till the required number of bytes have been read from the
	* input stream.
	*
	* @param is the InputStream to read from
	* @param buffer the buffer to store the bytes into
	* @param offset the offset to start storing at
	* @param len the number of bytes to read
	* @throws EOFException if EOF is reached before all bytes are
	* read.
	* @throws IOException is an error occurs while reading
	*/
	public static final void readFully(InputStream is,
	byte[] buffer, int offset, int len)
	throws IOException {
	int temp;
	while (len > 0) {
	temp = is.read(buffer, offset, len);
	if (temp == -1)
	throw new EOFException("Cannot read all "
	+ len
	+ " bytes needed to form this token!");
	offset += temp;
	len -= temp;
	}
	}

	public static final void debug(String str) {
	System.err.print(str);
	}

	public static final String getHexBytes(byte[] bytes) {
	return getHexBytes(bytes, 0, bytes.length);
	}

	public static final String getHexBytes(byte[] bytes, int len) {
	return getHexBytes(bytes, 0, len);
	}

	public static final String getHexBytes(byte[] bytes, int pos, int len) {
	StringBuffer sb = new StringBuffer();
	for (int i = pos; i < (pos+len); i++) {
	int b1 = (bytes[i]>>4) & 0x0f;
	int b2 = bytes[i] & 0x0f;

	sb.append(Integer.toHexString(b1));
	sb.append(Integer.toHexString(b2));
	sb.append(' ');
	}
	return sb.toString();
	}

	}

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