/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.sdk.asn1;
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import static com.sun.opends.sdk.util.Messages.*;
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import static org.opends.sdk.asn1.ASN1Constants.*;
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import java.io.IOException;
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import java.util.LinkedList;
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import java.util.logging.Level;
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import org.opends.sdk.DecodeException;
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import org.opends.sdk.util.ByteSequenceReader;
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import org.opends.sdk.util.ByteString;
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import org.opends.sdk.util.ByteStringBuilder;
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import org.opends.sdk.util.StaticUtils;
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import com.sun.opends.sdk.util.Message;
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/**
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* An ASN.1 reader that reads from a {@link ByteSequenceReader}.
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*/
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final class ASN1ByteSequenceReader extends AbstractASN1Reader implements
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ASN1Reader
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{
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private int state = ELEMENT_READ_STATE_NEED_TYPE;
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private byte peekType = 0;
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private int peekLength = -1;
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private final int maxElementSize;
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private ByteSequenceReader reader;
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private final LinkedList<ByteSequenceReader> readerStack;
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/**
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* Creates a new ASN1 reader whose source is the provided byte
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* sequence reader and having a user defined maximum BER element size.
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*
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* @param reader
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* The byte sequence reader to be read.
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* @param maxElementSize
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* The maximum BER element size, or <code>0</code> to
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* indicate that there is no limit.
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*/
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ASN1ByteSequenceReader(ByteSequenceReader reader, int maxElementSize)
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{
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this.reader = reader;
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this.readerStack = new LinkedList<ByteSequenceReader>();
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this.maxElementSize = maxElementSize;
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}
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/**
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* {@inheritDoc}
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*/
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public void close() throws IOException
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{
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readerStack.clear();
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}
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/**
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* {@inheritDoc}
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*/
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public boolean elementAvailable() throws IOException
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{
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if ((state == ELEMENT_READ_STATE_NEED_TYPE)
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&& !needTypeState(false))
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{
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return false;
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}
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if ((state == ELEMENT_READ_STATE_NEED_FIRST_LENGTH_BYTE)
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&& !needFirstLengthByteState(false))
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{
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return false;
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}
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return peekLength <= reader.remaining();
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}
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/**
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* {@inheritDoc}
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*/
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public boolean hasNextElement() throws IOException
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{
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return (state != ELEMENT_READ_STATE_NEED_TYPE)
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|| needTypeState(false);
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}
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/**
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* {@inheritDoc}
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*/
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public int peekLength() throws IOException
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{
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peekType();
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if (state == ELEMENT_READ_STATE_NEED_FIRST_LENGTH_BYTE)
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{
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needFirstLengthByteState(true);
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}
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return peekLength;
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}
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/**
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* {@inheritDoc}
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*/
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public byte peekType() throws IOException
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{
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if (state == ELEMENT_READ_STATE_NEED_TYPE)
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{
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// Read just the type.
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if (reader.remaining() <= 0)
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{
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Message message = ERR_ASN1_TRUCATED_TYPE_BYTE.get();
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throw DecodeException.fatalError(message);
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}
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int type = reader.get();
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peekType = (byte) type;
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state = ELEMENT_READ_STATE_NEED_FIRST_LENGTH_BYTE;
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}
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return peekType;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean readBoolean() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if (peekLength != 1)
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{
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Message message = ERR_ASN1_BOOLEAN_INVALID_LENGTH.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_BOOLEAN_TRUNCATED_VALUE
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.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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int readByte = reader.get();
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state = ELEMENT_READ_STATE_NEED_TYPE;
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return readByte != 0x00;
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}
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/**
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* {@inheritDoc}
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*/
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public void readEndSequence() throws IOException,
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IllegalStateException
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{
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if (readerStack.isEmpty())
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{
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Message message = ERR_ASN1_SEQUENCE_READ_NOT_STARTED.get();
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throw new IllegalStateException(message.toString());
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}
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if ((reader.remaining() > 0)
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&& StaticUtils.DEBUG_LOG.isLoggable(Level.FINE))
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{
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StaticUtils.DEBUG_LOG.fine("Ignoring " + reader.remaining()
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+ " unused trailing bytes in " + "ASN.1 SEQUENCE");
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}
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reader = readerStack.removeFirst();
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// Reset the state
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state = ELEMENT_READ_STATE_NEED_TYPE;
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}
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/**
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* {@inheritDoc}
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*/
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public void readEndSet() throws IOException
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{
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// From an implementation point of view, a set is equivalent to a
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// sequence.
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readEndSequence();
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}
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/**
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* {@inheritDoc}
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*/
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public int readEnumerated() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if ((peekLength < 1) || (peekLength > 4))
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{
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Message message = ERR_ASN1_INTEGER_INVALID_LENGTH.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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// From an implementation point of view, an enumerated value is
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// equivalent to an integer.
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return (int) readInteger();
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}
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/**
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* {@inheritDoc}
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*/
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public long readInteger() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if ((peekLength < 1) || (peekLength > 8))
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{
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Message message = ERR_ASN1_INTEGER_INVALID_LENGTH.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_INTEGER_TRUNCATED_VALUE
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.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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if (peekLength > 4)
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{
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long longValue = 0;
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for (int i = 0; i < peekLength; i++)
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{
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int readByte = reader.get();
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if ((i == 0) && (readByte < 0))
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{
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longValue = 0xFFFFFFFFFFFFFFFFL;
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}
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longValue = (longValue << 8) | (readByte & 0xFF);
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}
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state = ELEMENT_READ_STATE_NEED_TYPE;
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return longValue;
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}
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else
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{
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int intValue = 0;
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for (int i = 0; i < peekLength; i++)
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{
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int readByte = reader.get();
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if ((i == 0) && (readByte < 0))
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{
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intValue = 0xFFFFFFFF;
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}
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intValue = (intValue << 8) | (readByte & 0xFF);
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}
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state = ELEMENT_READ_STATE_NEED_TYPE;
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return intValue;
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}
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}
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/**
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* {@inheritDoc}
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*/
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public void readNull() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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// Make sure that the decoded length is exactly zero byte.
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if (peekLength != 0)
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{
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Message message = ERR_ASN1_NULL_INVALID_LENGTH.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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state = ELEMENT_READ_STATE_NEED_TYPE;
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}
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/**
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* {@inheritDoc}
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*/
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public ByteString readOctetString() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_OCTET_STRING_TRUNCATED_VALUE
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.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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state = ELEMENT_READ_STATE_NEED_TYPE;
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return reader.getByteString(peekLength);
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}
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/**
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* {@inheritDoc}
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*/
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public ByteStringBuilder readOctetString(ByteStringBuilder builder)
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throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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// Copy the value.
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_OCTET_STRING_TRUNCATED_VALUE
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.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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builder.append(reader, peekLength);
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state = ELEMENT_READ_STATE_NEED_TYPE;
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return builder;
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}
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/**
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* {@inheritDoc}
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*/
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public String readOctetStringAsString() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_OCTET_STRING_TRUNCATED_VALUE
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.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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state = ELEMENT_READ_STATE_NEED_TYPE;
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return reader.getString(peekLength);
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}
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/**
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* {@inheritDoc}
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*/
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public void readStartSequence() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_SEQUENCE_SET_TRUNCATED_VALUE
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.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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ByteSequenceReader subByteString = reader.getByteSequence(
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peekLength).asReader();
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readerStack.addFirst(reader);
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reader = subByteString;
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// Reset the state
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state = ELEMENT_READ_STATE_NEED_TYPE;
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}
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/**
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* {@inheritDoc}
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*/
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public void readStartSet() throws IOException
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{
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// From an implementation point of view, a set is equivalent to a
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// sequence.
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readStartSequence();
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}
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/**
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* {@inheritDoc}
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*/
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public ASN1Reader skipElement() throws IOException
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{
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// Read the header if haven't done so already
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peekLength();
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if (reader.remaining() < peekLength)
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{
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Message message = ERR_ASN1_SKIP_TRUNCATED_VALUE.get(peekLength);
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throw DecodeException.fatalError(message);
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}
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state = ELEMENT_READ_STATE_NEED_TYPE;
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reader.skip(peekLength);
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return this;
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}
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/**
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* Internal helper method reading the first length bytes and
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* transition to the next state if successful.
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*
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* @param throwEofException
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* <code>true</code> to throw an exception when the end of
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* the sequence is encountered.
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* @return <code>true</code> if the length bytes was successfully read
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* @throws IOException
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* If an error occurs while trying to decode an ASN1
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* element.
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*/
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private boolean needFirstLengthByteState(boolean throwEofException)
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throws IOException
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{
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if (reader.remaining() <= 0)
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{
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if (throwEofException)
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{
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Message message = ERR_ASN1_TRUNCATED_LENGTH_BYTE.get();
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throw DecodeException.fatalError(message);
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}
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return false;
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}
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int readByte = reader.get();
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peekLength = (readByte & 0x7F);
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if (peekLength != readByte)
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{
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int lengthBytesNeeded = peekLength;
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if (lengthBytesNeeded > 4)
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{
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Message message = ERR_ASN1_INVALID_NUM_LENGTH_BYTES
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.get(lengthBytesNeeded);
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throw DecodeException.fatalError(message);
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}
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peekLength = 0x00;
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if (reader.remaining() < lengthBytesNeeded)
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{
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if (throwEofException)
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{
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Message message = ERR_ASN1_TRUNCATED_LENGTH_BYTES
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.get(lengthBytesNeeded);
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throw DecodeException.fatalError(message);
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}
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return false;
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}
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while (lengthBytesNeeded > 0)
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{
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readByte = reader.get();
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peekLength = (peekLength << 8) | (readByte & 0xFF);
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lengthBytesNeeded--;
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}
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}
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// Make sure that the element is not larger than the maximum allowed
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// message size.
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if ((maxElementSize > 0) && (peekLength > maxElementSize))
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{
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Message message = ERR_LDAP_CLIENT_DECODE_MAX_REQUEST_SIZE_EXCEEDED
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.get(peekLength, maxElementSize);
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throw DecodeException.fatalError(message);
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}
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state = ELEMENT_READ_STATE_NEED_VALUE_BYTES;
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return true;
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}
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/**
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* Internal helper method reading the ASN.1 type byte and transition
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* to the next state if successful.
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*
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* @param throwEofException
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* <code>true</code> to throw an exception when the end of
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* the sequence is encountered.
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* @return <code>true</code> if the type byte was successfully read
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* @throws IOException
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* If an error occurs while trying to decode an ASN1
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* element.
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*/
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private boolean needTypeState(boolean throwEofException)
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throws IOException
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{
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// Read just the type.
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if (reader.remaining() <= 0)
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{
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if (throwEofException)
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{
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Message message = ERR_ASN1_TRUCATED_TYPE_BYTE.get();
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throw DecodeException.fatalError(message);
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}
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return false;
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}
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int type = reader.get();
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peekType = (byte) type;
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state = ELEMENT_READ_STATE_NEED_FIRST_LENGTH_BYTE;
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return true;
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}
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}
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