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	/*
	* Copyright (c) 1996, 2018, 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.ssl;

	import java.io.IOException;
	import java.nio.ByteBuffer;
	import javax.net.ssl.SSLException;

	/**
	* SSL/(D)TLS record.
	*
	* This is the base interface, which defines common information and interfaces
	* used by both Input and Output records.
	*
	* @author David Brownell
	*/
	interface Record {
	static final int maxMacSize = 48; // the max supported MAC or
	// AEAD tag size
	static final int maxDataSize = 16384; // 2^14 bytes of data
	static final int maxPadding = 256; // block cipher padding
	static final int maxIVLength = 16; // the max supported IV length

	static final int maxFragmentSize = 18432; // the max fragment size
	// 2^14 + 2048

	/*
	* System property to enable/disable CBC protection in SSL3/TLS1.
	*/
	static final boolean enableCBCProtection =
	Utilities.getBooleanProperty("jsse.enableCBCProtection", true);

	/*
	* The overflow values of integers of 8, 16 and 24 bits.
	*/
	static final int OVERFLOW_OF_INT08 = (0x01 << 8);
	static final int OVERFLOW_OF_INT16 = (0x01 << 16);
	static final int OVERFLOW_OF_INT24 = (0x01 << 24);

	/*
	* Read 8, 16, 24, and 32 bit integer data types, encoded
	* in standard big-endian form.
	*/
	static int getInt8(ByteBuffer m) throws IOException {
	verifyLength(m, 1);
	return (m.get() & 0xFF);
	}

	static int getInt16(ByteBuffer m) throws IOException {
	verifyLength(m, 2);
	return ((m.get() & 0xFF) << 8) \|
	(m.get() & 0xFF);
	}

	static int getInt24(ByteBuffer m) throws IOException {
	verifyLength(m, 3);
	return ((m.get() & 0xFF) << 16) \|
	((m.get() & 0xFF) << 8) \|
	(m.get() & 0xFF);
	}

	static int getInt32(ByteBuffer m) throws IOException {
	verifyLength(m, 4);
	return ((m.get() & 0xFF) << 24) \|
	((m.get() & 0xFF) << 16) \|
	((m.get() & 0xFF) << 8) \|
	(m.get() & 0xFF);
	}

	/*
	* Read byte vectors with 8, 16, and 24 bit length encodings.
	*/
	static byte[] getBytes8(ByteBuffer m) throws IOException {
	int len = Record.getInt8(m);
	verifyLength(m, len);
	byte[] b = new byte[len];

	m.get(b);
	return b;
	}

	static byte[] getBytes16(ByteBuffer m) throws IOException {
	int len = Record.getInt16(m);
	verifyLength(m, len);
	byte[] b = new byte[len];

	m.get(b);
	return b;
	}

	static byte[] getBytes24(ByteBuffer m) throws IOException {
	int len = Record.getInt24(m);
	verifyLength(m, len);
	byte[] b = new byte[len];

	m.get(b);
	return b;
	}

	/*
	* Write 8, 16, 24, and 32 bit integer data types, encoded
	* in standard big-endian form.
	*/
	static void putInt8(ByteBuffer m, int i) throws IOException {
	verifyLength(m, 1);
	m.put((byte)(i & 0xFF));
	}

	static void putInt16(ByteBuffer m, int i) throws IOException {
	verifyLength(m, 2);
	m.put((byte)((i >> 8) & 0xFF));
	m.put((byte)(i & 0xFF));
	}

	static void putInt24(ByteBuffer m, int i) throws IOException {
	verifyLength(m, 3);
	m.put((byte)((i >> 16) & 0xFF));
	m.put((byte)((i >> 8) & 0xFF));
	m.put((byte)(i & 0xFF));
	}

	static void putInt32(ByteBuffer m, int i) throws IOException {
	m.put((byte)((i >> 24) & 0xFF));
	m.put((byte)((i >> 16) & 0xFF));
	m.put((byte)((i >> 8) & 0xFF));
	m.put((byte)(i & 0xFF));
	}

	/*
	* Write byte vectors with 8, 16, and 24 bit length encodings.
	*/
	static void putBytes8(ByteBuffer m, byte[] s) throws IOException {
	if (s == null \|\| s.length == 0) {
	verifyLength(m, 1);
	putInt8(m, 0);
	} else {
	verifyLength(m, 1 + s.length);
	putInt8(m, s.length);
	m.put(s);
	}
	}

	static void putBytes16(ByteBuffer m, byte[] s) throws IOException {
	if (s == null \|\| s.length == 0) {
	verifyLength(m, 2);
	putInt16(m, 0);
	} else {
	verifyLength(m, 2 + s.length);
	putInt16(m, s.length);
	m.put(s);
	}
	}

	static void putBytes24(ByteBuffer m, byte[] s) throws IOException {
	if (s == null \|\| s.length == 0) {
	verifyLength(m, 3);
	putInt24(m, 0);
	} else {
	verifyLength(m, 3 + s.length);
	putInt24(m, s.length);
	m.put(s);
	}
	}

	// Verify that the buffer has sufficient remaining.
	static void verifyLength(
	ByteBuffer m, int len) throws SSLException {
	if (len > m.remaining()) {
	throw new SSLException("Insufficient space in the buffer, " +
	"may be cause by an unexpected end of handshake data.");
	}
	}
	}

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