/*
 * Copyright (c) 2001-2008 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Hessian", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */

package com.alibaba.com.caucho.hessian.io;

import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Input stream for Hessian requests.
 * <p>
 * <p>HessianInput is unbuffered, so any client needs to provide
 * its own buffering.
 * <p>
 * <pre>
 * InputStream is = ...; // from http connection
 * HessianInput in = new HessianInput(is);
 * String value;
 *
 * in.startReply();         // read reply header
 * value = in.readString(); // read string value
 * in.completeReply();      // read reply footer
 * </pre>
 */
public class Hessian2Input
        extends AbstractHessianInput
        implements Hessian2Constants {
    private static final Logger log
            = Logger.getLogger(Hessian2Input.class.getName());

    private static final double D_256 = 1.0 / 256.0;
    private static final int END_OF_DATA = -2;
    private static final int SIZE = 256;
    private static final int GAP = 16;
    private static Field _detailMessageField;
    private static boolean _isCloseStreamOnClose;

    static {
        try {
            _detailMessageField = Throwable.class.getDeclaredField("detailMessage");
            _detailMessageField.setAccessible(true);
        } catch (Throwable e) {
        }
    }

    private final byte[] _buffer = new byte[SIZE];
    // factory for deserializing objects in the input stream
    protected SerializerFactory _serializerFactory;
    protected ArrayList _refs;
    protected ArrayList _classDefs;
    protected ArrayList _types;
    // the underlying input stream
    private InputStream _is;
    // a peek character
    private int _offset;
    private int _length;
    // true for streaming data
    private boolean _isStreaming;
    // the method for a call
    private String _method;
    private int _argLength;
    private Reader _chunkReader;
    private InputStream _chunkInputStream;
    private Throwable _replyFault;
    private StringBuilder _sbuf = new StringBuilder();
    // true if this is the last chunk
    private boolean _isLastChunk;
    // the chunk length
    private int _chunkLength;

    /**
     * Creates a new Hessian input stream, initialized with an
     * underlying input stream.
     *
     * @param is the underlying input stream.
     */
    public Hessian2Input(InputStream is) {
        _is = is;
    }

    /**
     * Gets the serializer factory.
     */
    public SerializerFactory getSerializerFactory() {
        return _serializerFactory;
    }

    /**
     * Sets the serializer factory.
     */
    @Override
    public void setSerializerFactory(SerializerFactory factory) {
        _serializerFactory = factory;
    }

    /**
     * Gets the serializer factory, creating a default if necessary.
     */
    public final SerializerFactory findSerializerFactory() {
        SerializerFactory factory = _serializerFactory;

        if (factory == null)
            _serializerFactory = factory = new SerializerFactory();

        return factory;
    }

    public boolean isCloseStreamOnClose() {
        return _isCloseStreamOnClose;
    }

    public void setCloseStreamOnClose(boolean isClose) {
        _isCloseStreamOnClose = isClose;
    }

    /**
     * Returns the calls method
     */
    @Override
    public String getMethod() {
        return _method;
    }

    /**
     * Returns any reply fault.
     */
    public Throwable getReplyFault() {
        return _replyFault;
    }

    /**
     * Starts reading the call
     * <p>
     * <pre>
     * c major minor
     * </pre>
     */
    @Override
    public int readCall()
            throws IOException {
        int tag = read();

        if (tag != 'C')
            throw error("expected hessian call ('C') at " + codeName(tag));

        return 0;
    }

    /**
     * Starts reading the envelope
     * <p>
     * <pre>
     * E major minor
     * </pre>
     */
    public int readEnvelope()
            throws IOException {
        int tag = read();
        int version = 0;

        if (tag == 'H') {
            int major = read();
            int minor = read();

            version = (major << 16) + minor;

            tag = read();
        }

        if (tag != 'E')
            throw error("expected hessian Envelope ('E') at " + codeName(tag));

        return version;
    }

    /**
     * Completes reading the envelope
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * Z
     * </pre>
     */
    public void completeEnvelope()
            throws IOException {
        int tag = read();

        if (tag != 'Z')
            error("expected end of envelope at " + codeName(tag));
    }

    /**
     * Starts reading the call
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * string
     * </pre>
     */
    @Override
    public String readMethod()
            throws IOException {
        _method = readString();

        return _method;
    }

    /**
     * Returns the number of method arguments
     * <p>
     * <pre>
     * int
     * </pre>
     */
    @Override
    public int readMethodArgLength()
            throws IOException {
        return readInt();
    }

    /**
     * Starts reading the call, including the headers.
     * <p>
     * <p>The call expects the following protocol data
     * <p>
     * <pre>
     * c major minor
     * m b16 b8 method
     * </pre>
     */
    @Override
    public void startCall()
            throws IOException {
        readCall();

        readMethod();
    }

    /**
     * Completes reading the call
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * </pre>
     */
    @Override
    public void completeCall()
            throws IOException {
    }

    /**
     * Reads a reply as an object.
     * If the reply has a fault, throws the exception.
     */
    @Override
    public Object readReply(Class expectedClass)
            throws Throwable {
        int tag = read();

        if (tag == 'R')
            return readObject(expectedClass);
        else if (tag == 'F') {
            HashMap map = (HashMap) readObject(HashMap.class);

            throw prepareFault(map);
        } else {
            StringBuilder sb = new StringBuilder();
            sb.append((char) tag);

            try {
                int ch;

                while ((ch = read()) >= 0) {
                    sb.append((char) ch);
                }
            } catch (IOException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            throw error("expected hessian reply at " + codeName(tag) + "\n"
                    + sb);
        }
    }

    /**
     * Starts reading the reply
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * r
     * </pre>
     */
    @Override
    public void startReply()
            throws Throwable {
        // XXX: for variable length (?)

        readReply(Object.class);
    }

    /**
     * Prepares the fault.
     */
    private Throwable prepareFault(HashMap fault)
            throws IOException {
        Object detail = fault.get("detail");
        String message = (String) fault.get("message");

        if (detail instanceof Throwable) {
            _replyFault = (Throwable) detail;

            if (message != null && _detailMessageField != null) {
                try {
                    _detailMessageField.set(_replyFault, message);
                } catch (Throwable e) {
                }
            }

            return _replyFault;
        } else {
            String code = (String) fault.get("code");

            _replyFault = new HessianServiceException(message, code, detail);

            return _replyFault;
        }
    }

    /**
     * Completes reading the call
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * z
     * </pre>
     */
    @Override
    public void completeReply()
            throws IOException {
    }

    /**
     * Completes reading the call
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * z
     * </pre>
     */
    public void completeValueReply()
            throws IOException {
        int tag = read();

        if (tag != 'Z')
            error("expected end of reply at " + codeName(tag));
    }

    /**
     * Reads a header, returning null if there are no headers.
     * <p>
     * <pre>
     * H b16 b8 value
     * </pre>
     */
    @Override
    public String readHeader()
            throws IOException {
        return null;
    }

    /**
     * Starts reading the message
     * <p>
     * <pre>
     * p major minor
     * </pre>
     */
    public int startMessage()
            throws IOException {
        int tag = read();

        if (tag == 'p')
            _isStreaming = false;
        else if (tag == 'P')
            _isStreaming = true;
        else
            throw error("expected Hessian message ('p') at " + codeName(tag));

        int major = read();
        int minor = read();

        return (major << 16) + minor;
    }

    /**
     * Completes reading the message
     * <p>
     * <p>A successful completion will have a single value:
     * <p>
     * <pre>
     * z
     * </pre>
     */
    public void completeMessage()
            throws IOException {
        int tag = read();

        if (tag != 'Z')
            error("expected end of message at " + codeName(tag));
    }

    /**
     * Reads a null
     * <p>
     * <pre>
     * N
     * </pre>
     */
    @Override
    public void readNull()
            throws IOException {
        int tag = read();

        switch (tag) {
            case 'N':
                return;

            default:
                throw expect("null", tag);
        }
    }

    /**
     * Reads a boolean
     * <p>
     * <pre>
     * T
     * F
     * </pre>
     */
    @Override
    public boolean readBoolean()
            throws IOException {
        int tag = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        switch (tag) {
            case 'T':
                return true;
            case 'F':
                return false;

            // direct integer
            case 0x80:
            case 0x81:
            case 0x82:
            case 0x83:
            case 0x84:
            case 0x85:
            case 0x86:
            case 0x87:
            case 0x88:
            case 0x89:
            case 0x8a:
            case 0x8b:
            case 0x8c:
            case 0x8d:
            case 0x8e:
            case 0x8f:

            case 0x90:
            case 0x91:
            case 0x92:
            case 0x93:
            case 0x94:
            case 0x95:
            case 0x96:
            case 0x97:
            case 0x98:
            case 0x99:
            case 0x9a:
            case 0x9b:
            case 0x9c:
            case 0x9d:
            case 0x9e:
            case 0x9f:

            case 0xa0:
            case 0xa1:
            case 0xa2:
            case 0xa3:
            case 0xa4:
            case 0xa5:
            case 0xa6:
            case 0xa7:
            case 0xa8:
            case 0xa9:
            case 0xaa:
            case 0xab:
            case 0xac:
            case 0xad:
            case 0xae:
            case 0xaf:

            case 0xb0:
            case 0xb1:
            case 0xb2:
            case 0xb3:
            case 0xb4:
            case 0xb5:
            case 0xb6:
            case 0xb7:
            case 0xb8:
            case 0xb9:
            case 0xba:
            case 0xbb:
            case 0xbc:
            case 0xbd:
            case 0xbe:
            case 0xbf:
                return tag != BC_INT_ZERO;

            // INT_BYTE = 0
            case 0xc8:
                return read() != 0;

            // INT_BYTE != 0
            case 0xc0:
            case 0xc1:
            case 0xc2:
            case 0xc3:
            case 0xc4:
            case 0xc5:
            case 0xc6:
            case 0xc7:
            case 0xc9:
            case 0xca:
            case 0xcb:
            case 0xcc:
            case 0xcd:
            case 0xce:
            case 0xcf:
                read();
                return true;

            // INT_SHORT = 0
            case 0xd4:
                return (256 * read() + read()) != 0;

            // INT_SHORT != 0
            case 0xd0:
            case 0xd1:
            case 0xd2:
            case 0xd3:
            case 0xd5:
            case 0xd6:
            case 0xd7:
                read();
                read();
                return true;

            case 'I':
                return
                        parseInt() != 0;

            case 0xd8:
            case 0xd9:
            case 0xda:
            case 0xdb:
            case 0xdc:
            case 0xdd:
            case 0xde:
            case 0xdf:

            case 0xe0:
            case 0xe1:
            case 0xe2:
            case 0xe3:
            case 0xe4:
            case 0xe5:
            case 0xe6:
            case 0xe7:
            case 0xe8:
            case 0xe9:
            case 0xea:
            case 0xeb:
            case 0xec:
            case 0xed:
            case 0xee:
            case 0xef:
                return tag != BC_LONG_ZERO;

            // LONG_BYTE = 0
            case 0xf8:
                return read() != 0;

            // LONG_BYTE != 0
            case 0xf0:
            case 0xf1:
            case 0xf2:
            case 0xf3:
            case 0xf4:
            case 0xf5:
            case 0xf6:
            case 0xf7:
            case 0xf9:
            case 0xfa:
            case 0xfb:
            case 0xfc:
            case 0xfd:
            case 0xfe:
            case 0xff:
                read();
                return true;

            // INT_SHORT = 0
            case 0x3c:
                return (256 * read() + read()) != 0;

            // INT_SHORT != 0
            case 0x38:
            case 0x39:
            case 0x3a:
            case 0x3b:
            case 0x3d:
            case 0x3e:
            case 0x3f:
                read();
                read();
                return true;

            case BC_LONG_INT:
                return (0x1000000L * read()
                        + 0x10000L * read()
                        + 0x100 * read()
                        + read()) != 0;

            case 'L':
                return parseLong() != 0;

            case BC_DOUBLE_ZERO:
                return false;

            case BC_DOUBLE_ONE:
                return true;

            case BC_DOUBLE_BYTE:
                return read() != 0;

            case BC_DOUBLE_SHORT:
                return (0x100 * read() + read()) != 0;

            case BC_DOUBLE_MILL: {
                int mills = parseInt();

                return mills != 0;
            }

            case 'D':
                return parseDouble() != 0.0;

            case 'N':
                return false;

            default:
                throw expect("boolean", tag);
        }
    }

    /**
     * Reads a short
     * <p>
     * <pre>
     * I b32 b24 b16 b8
     * </pre>
     */
    public short readShort()
            throws IOException {
        return (short) readInt();
    }

    /**
     * Reads an integer
     * <p>
     * <pre>
     * I b32 b24 b16 b8
     * </pre>
     */
    @Override
    public final int readInt()
            throws IOException {
        //int tag = _offset < _length ? (_buffer[_offset++] & 0xff) : read();
        int tag = read();

        switch (tag) {
            case 'N':
                return 0;

            case 'F':
                return 0;

            case 'T':
                return 1;

            // direct integer
            case 0x80:
            case 0x81:
            case 0x82:
            case 0x83:
            case 0x84:
            case 0x85:
            case 0x86:
            case 0x87:
            case 0x88:
            case 0x89:
            case 0x8a:
            case 0x8b:
            case 0x8c:
            case 0x8d:
            case 0x8e:
            case 0x8f:

            case 0x90:
            case 0x91:
            case 0x92:
            case 0x93:
            case 0x94:
            case 0x95:
            case 0x96:
            case 0x97:
            case 0x98:
            case 0x99:
            case 0x9a:
            case 0x9b:
            case 0x9c:
            case 0x9d:
            case 0x9e:
            case 0x9f:

            case 0xa0:
            case 0xa1:
            case 0xa2:
            case 0xa3:
            case 0xa4:
            case 0xa5:
            case 0xa6:
            case 0xa7:
            case 0xa8:
            case 0xa9:
            case 0xaa:
            case 0xab:
            case 0xac:
            case 0xad:
            case 0xae:
            case 0xaf:

            case 0xb0:
            case 0xb1:
            case 0xb2:
            case 0xb3:
            case 0xb4:
            case 0xb5:
            case 0xb6:
            case 0xb7:
            case 0xb8:
            case 0xb9:
            case 0xba:
            case 0xbb:
            case 0xbc:
            case 0xbd:
            case 0xbe:
            case 0xbf:
                return tag - BC_INT_ZERO;

      /* byte int */
            case 0xc0:
            case 0xc1:
            case 0xc2:
            case 0xc3:
            case 0xc4:
            case 0xc5:
            case 0xc6:
            case 0xc7:
            case 0xc8:
            case 0xc9:
            case 0xca:
            case 0xcb:
            case 0xcc:
            case 0xcd:
            case 0xce:
            case 0xcf:
                return ((tag - BC_INT_BYTE_ZERO) << 8) + read();

      /* short int */
            case 0xd0:
            case 0xd1:
            case 0xd2:
            case 0xd3:
            case 0xd4:
            case 0xd5:
            case 0xd6:
            case 0xd7:
                return ((tag - BC_INT_SHORT_ZERO) << 16) + 256 * read() + read();

            case 'I':
            case BC_LONG_INT:
                return ((read() << 24)
                        + (read() << 16)
                        + (read() << 8)
                        + read());

            // direct long
            case 0xd8:
            case 0xd9:
            case 0xda:
            case 0xdb:
            case 0xdc:
            case 0xdd:
            case 0xde:
            case 0xdf:

            case 0xe0:
            case 0xe1:
            case 0xe2:
            case 0xe3:
            case 0xe4:
            case 0xe5:
            case 0xe6:
            case 0xe7:
            case 0xe8:
            case 0xe9:
            case 0xea:
            case 0xeb:
            case 0xec:
            case 0xed:
            case 0xee:
            case 0xef:
                return tag - BC_LONG_ZERO;

      /* byte long */
            case 0xf0:
            case 0xf1:
            case 0xf2:
            case 0xf3:
            case 0xf4:
            case 0xf5:
            case 0xf6:
            case 0xf7:
            case 0xf8:
            case 0xf9:
            case 0xfa:
            case 0xfb:
            case 0xfc:
            case 0xfd:
            case 0xfe:
            case 0xff:
                return ((tag - BC_LONG_BYTE_ZERO) << 8) + read();

      /* short long */
            case 0x38:
            case 0x39:
            case 0x3a:
            case 0x3b:
            case 0x3c:
            case 0x3d:
            case 0x3e:
            case 0x3f:
                return ((tag - BC_LONG_SHORT_ZERO) << 16) + 256 * read() + read();

            case 'L':
                return (int) parseLong();

            case BC_DOUBLE_ZERO:
                return 0;

            case BC_DOUBLE_ONE:
                return 1;

            //case LONG_BYTE:
            case BC_DOUBLE_BYTE:
                return (byte) (_offset < _length ? _buffer[_offset++] : read());

            //case INT_SHORT:
            //case LONG_SHORT:
            case BC_DOUBLE_SHORT:
                return (short) (256 * read() + read());

            case BC_DOUBLE_MILL: {
                int mills = parseInt();

                return (int) (0.001 * mills);
            }

            case 'D':
                return (int) parseDouble();

            default:
                throw expect("integer", tag);
        }
    }

    /**
     * Reads a long
     * <p>
     * <pre>
     * L b64 b56 b48 b40 b32 b24 b16 b8
     * </pre>
     */
    @Override
    public long readLong()
            throws IOException {
        int tag = read();

        switch (tag) {
            case 'N':
                return 0;

            case 'F':
                return 0;

            case 'T':
                return 1;

            // direct integer
            case 0x80:
            case 0x81:
            case 0x82:
            case 0x83:
            case 0x84:
            case 0x85:
            case 0x86:
            case 0x87:
            case 0x88:
            case 0x89:
            case 0x8a:
            case 0x8b:
            case 0x8c:
            case 0x8d:
            case 0x8e:
            case 0x8f:

            case 0x90:
            case 0x91:
            case 0x92:
            case 0x93:
            case 0x94:
            case 0x95:
            case 0x96:
            case 0x97:
            case 0x98:
            case 0x99:
            case 0x9a:
            case 0x9b:
            case 0x9c:
            case 0x9d:
            case 0x9e:
            case 0x9f:

            case 0xa0:
            case 0xa1:
            case 0xa2:
            case 0xa3:
            case 0xa4:
            case 0xa5:
            case 0xa6:
            case 0xa7:
            case 0xa8:
            case 0xa9:
            case 0xaa:
            case 0xab:
            case 0xac:
            case 0xad:
            case 0xae:
            case 0xaf:

            case 0xb0:
            case 0xb1:
            case 0xb2:
            case 0xb3:
            case 0xb4:
            case 0xb5:
            case 0xb6:
            case 0xb7:
            case 0xb8:
            case 0xb9:
            case 0xba:
            case 0xbb:
            case 0xbc:
            case 0xbd:
            case 0xbe:
            case 0xbf:
                return tag - BC_INT_ZERO;

      /* byte int */
            case 0xc0:
            case 0xc1:
            case 0xc2:
            case 0xc3:
            case 0xc4:
            case 0xc5:
            case 0xc6:
            case 0xc7:
            case 0xc8:
            case 0xc9:
            case 0xca:
            case 0xcb:
            case 0xcc:
            case 0xcd:
            case 0xce:
            case 0xcf:
                return ((tag - BC_INT_BYTE_ZERO) << 8) + read();

      /* short int */
            case 0xd0:
            case 0xd1:
            case 0xd2:
            case 0xd3:
            case 0xd4:
            case 0xd5:
            case 0xd6:
            case 0xd7:
                return ((tag - BC_INT_SHORT_ZERO) << 16) + 256 * read() + read();

            //case LONG_BYTE:
            case BC_DOUBLE_BYTE:
                return (byte) (_offset < _length ? _buffer[_offset++] : read());

            //case INT_SHORT:
            //case LONG_SHORT:
            case BC_DOUBLE_SHORT:
                return (short) (256 * read() + read());

            case 'I':
            case BC_LONG_INT:
                return parseInt();

            // direct long
            case 0xd8:
            case 0xd9:
            case 0xda:
            case 0xdb:
            case 0xdc:
            case 0xdd:
            case 0xde:
            case 0xdf:

            case 0xe0:
            case 0xe1:
            case 0xe2:
            case 0xe3:
            case 0xe4:
            case 0xe5:
            case 0xe6:
            case 0xe7:
            case 0xe8:
            case 0xe9:
            case 0xea:
            case 0xeb:
            case 0xec:
            case 0xed:
            case 0xee:
            case 0xef:
                return tag - BC_LONG_ZERO;

      /* byte long */
            case 0xf0:
            case 0xf1:
            case 0xf2:
            case 0xf3:
            case 0xf4:
            case 0xf5:
            case 0xf6:
            case 0xf7:
            case 0xf8:
            case 0xf9:
            case 0xfa:
            case 0xfb:
            case 0xfc:
            case 0xfd:
            case 0xfe:
            case 0xff:
                return ((tag - BC_LONG_BYTE_ZERO) << 8) + read();

      /* short long */
            case 0x38:
            case 0x39:
            case 0x3a:
            case 0x3b:
            case 0x3c:
            case 0x3d:
            case 0x3e:
            case 0x3f:
                return ((tag - BC_LONG_SHORT_ZERO) << 16) + 256 * read() + read();

            case 'L':
                return parseLong();

            case BC_DOUBLE_ZERO:
                return 0;

            case BC_DOUBLE_ONE:
                return 1;

            case BC_DOUBLE_MILL: {
                int mills = parseInt();

                return (long) (0.001 * mills);
            }

            case 'D':
                return (long) parseDouble();

            default:
                throw expect("long", tag);
        }
    }

    /**
     * Reads a float
     * <p>
     * <pre>
     * D b64 b56 b48 b40 b32 b24 b16 b8
     * </pre>
     */
    public float readFloat()
            throws IOException {
        return (float) readDouble();
    }

    /**
     * Reads a double
     * <p>
     * <pre>
     * D b64 b56 b48 b40 b32 b24 b16 b8
     * </pre>
     */
    @Override
    public double readDouble()
            throws IOException {
        int tag = read();

        switch (tag) {
            case 'N':
                return 0;

            case 'F':
                return 0;

            case 'T':
                return 1;

            // direct integer
            case 0x80:
            case 0x81:
            case 0x82:
            case 0x83:
            case 0x84:
            case 0x85:
            case 0x86:
            case 0x87:
            case 0x88:
            case 0x89:
            case 0x8a:
            case 0x8b:
            case 0x8c:
            case 0x8d:
            case 0x8e:
            case 0x8f:

            case 0x90:
            case 0x91:
            case 0x92:
            case 0x93:
            case 0x94:
            case 0x95:
            case 0x96:
            case 0x97:
            case 0x98:
            case 0x99:
            case 0x9a:
            case 0x9b:
            case 0x9c:
            case 0x9d:
            case 0x9e:
            case 0x9f:

            case 0xa0:
            case 0xa1:
            case 0xa2:
            case 0xa3:
            case 0xa4:
            case 0xa5:
            case 0xa6:
            case 0xa7:
            case 0xa8:
            case 0xa9:
            case 0xaa:
            case 0xab:
            case 0xac:
            case 0xad:
            case 0xae:
            case 0xaf:

            case 0xb0:
            case 0xb1:
            case 0xb2:
            case 0xb3:
            case 0xb4:
            case 0xb5:
            case 0xb6:
            case 0xb7:
            case 0xb8:
            case 0xb9:
            case 0xba:
            case 0xbb:
            case 0xbc:
            case 0xbd:
            case 0xbe:
            case 0xbf:
                return tag - 0x90;

      /* byte int */
            case 0xc0:
            case 0xc1:
            case 0xc2:
            case 0xc3:
            case 0xc4:
            case 0xc5:
            case 0xc6:
            case 0xc7:
            case 0xc8:
            case 0xc9:
            case 0xca:
            case 0xcb:
            case 0xcc:
            case 0xcd:
            case 0xce:
            case 0xcf:
                return ((tag - BC_INT_BYTE_ZERO) << 8) + read();

      /* short int */
            case 0xd0:
            case 0xd1:
            case 0xd2:
            case 0xd3:
            case 0xd4:
            case 0xd5:
            case 0xd6:
            case 0xd7:
                return ((tag - BC_INT_SHORT_ZERO) << 16) + 256 * read() + read();

            case 'I':
            case BC_LONG_INT:
                return parseInt();

            // direct long
            case 0xd8:
            case 0xd9:
            case 0xda:
            case 0xdb:
            case 0xdc:
            case 0xdd:
            case 0xde:
            case 0xdf:

            case 0xe0:
            case 0xe1:
            case 0xe2:
            case 0xe3:
            case 0xe4:
            case 0xe5:
            case 0xe6:
            case 0xe7:
            case 0xe8:
            case 0xe9:
            case 0xea:
            case 0xeb:
            case 0xec:
            case 0xed:
            case 0xee:
            case 0xef:
                return tag - BC_LONG_ZERO;

      /* byte long */
            case 0xf0:
            case 0xf1:
            case 0xf2:
            case 0xf3:
            case 0xf4:
            case 0xf5:
            case 0xf6:
            case 0xf7:
            case 0xf8:
            case 0xf9:
            case 0xfa:
            case 0xfb:
            case 0xfc:
            case 0xfd:
            case 0xfe:
            case 0xff:
                return ((tag - BC_LONG_BYTE_ZERO) << 8) + read();

      /* short long */
            case 0x38:
            case 0x39:
            case 0x3a:
            case 0x3b:
            case 0x3c:
            case 0x3d:
            case 0x3e:
            case 0x3f:
                return ((tag - BC_LONG_SHORT_ZERO) << 16) + 256 * read() + read();

            case 'L':
                return (double) parseLong();

            case BC_DOUBLE_ZERO:
                return 0;

            case BC_DOUBLE_ONE:
                return 1;

            case BC_DOUBLE_BYTE:
                return (byte) (_offset < _length ? _buffer[_offset++] : read());

            case BC_DOUBLE_SHORT:
                return (short) (256 * read() + read());

            case BC_DOUBLE_MILL: {
                int mills = parseInt();

                return 0.001 * mills;
            }

            case 'D':
                return parseDouble();

            default:
                throw expect("double", tag);
        }
    }

    /**
     * Reads a date.
     * <p>
     * <pre>
     * T b64 b56 b48 b40 b32 b24 b16 b8
     * </pre>
     */
    @Override
    public long readUTCDate()
            throws IOException {
        int tag = read();

        if (tag == BC_DATE) {
            return parseLong();
        } else if (tag == BC_DATE_MINUTE) {
            return parseInt() * 60000L;
        } else
            throw expect("date", tag);
    }

    /**
     * Reads a byte from the stream.
     */
    public int readChar()
            throws IOException {
        if (_chunkLength > 0) {
            _chunkLength--;
            if (_chunkLength == 0 && _isLastChunk)
                _chunkLength = END_OF_DATA;

            int ch = parseUTF8Char();
            return ch;
        } else if (_chunkLength == END_OF_DATA) {
            _chunkLength = 0;
            return -1;
        }

        int tag = read();

        switch (tag) {
            case 'N':
                return -1;

            case 'S':
            case BC_STRING_CHUNK:
                _isLastChunk = tag == 'S';
                _chunkLength = (read() << 8) + read();

                _chunkLength--;
                int value = parseUTF8Char();

                // special code so successive read byte won't
                // be read as a single object.
                if (_chunkLength == 0 && _isLastChunk)
                    _chunkLength = END_OF_DATA;

                return value;

            default:
                throw expect("char", tag);
        }
    }

    /**
     * Reads a byte array from the stream.
     */
    public int readString(char[] buffer, int offset, int length)
            throws IOException {
        int readLength = 0;

        if (_chunkLength == END_OF_DATA) {
            _chunkLength = 0;
            return -1;
        } else if (_chunkLength == 0) {
            int tag = read();

            switch (tag) {
                case 'N':
                    return -1;

                case 'S':
                case BC_STRING_CHUNK:
                    _isLastChunk = tag == 'S';
                    _chunkLength = (read() << 8) + read();
                    break;

                case 0x00:
                case 0x01:
                case 0x02:
                case 0x03:
                case 0x04:
                case 0x05:
                case 0x06:
                case 0x07:
                case 0x08:
                case 0x09:
                case 0x0a:
                case 0x0b:
                case 0x0c:
                case 0x0d:
                case 0x0e:
                case 0x0f:

                case 0x10:
                case 0x11:
                case 0x12:
                case 0x13:
                case 0x14:
                case 0x15:
                case 0x16:
                case 0x17:
                case 0x18:
                case 0x19:
                case 0x1a:
                case 0x1b:
                case 0x1c:
                case 0x1d:
                case 0x1e:
                case 0x1f:
                    _isLastChunk = true;
                    _chunkLength = tag - 0x00;
                    break;

                default:
                    throw expect("string", tag);
            }
        }

        while (length > 0) {
            if (_chunkLength > 0) {
                buffer[offset++] = (char) parseUTF8Char();
                _chunkLength--;
                length--;
                readLength++;
            } else if (_isLastChunk) {
                if (readLength == 0)
                    return -1;
                else {
                    _chunkLength = END_OF_DATA;
                    return readLength;
                }
            } else {
                int tag = read();

                switch (tag) {
                    case 'S':
                    case BC_STRING_CHUNK:
                        _isLastChunk = tag == 'S';
                        _chunkLength = (read() << 8) + read();
                        break;

                    default:
                        throw expect("string", tag);
                }
            }
        }

        if (readLength == 0)
            return -1;
        else if (_chunkLength > 0 || !_isLastChunk)
            return readLength;
        else {
            _chunkLength = END_OF_DATA;
            return readLength;
        }
    }

    /**
     * Reads a string
     * <p>
     * <pre>
     * S b16 b8 string value
     * </pre>
     */
    @Override
    public String readString()
            throws IOException {
        int tag = read();

        switch (tag) {
            case 'N':
                return null;
            case 'T':
                return "true";
            case 'F':
                return "false";

            // direct integer
            case 0x80:
            case 0x81:
            case 0x82:
            case 0x83:
            case 0x84:
            case 0x85:
            case 0x86:
            case 0x87:
            case 0x88:
            case 0x89:
            case 0x8a:
            case 0x8b:
            case 0x8c:
            case 0x8d:
            case 0x8e:
            case 0x8f:

            case 0x90:
            case 0x91:
            case 0x92:
            case 0x93:
            case 0x94:
            case 0x95:
            case 0x96:
            case 0x97:
            case 0x98:
            case 0x99:
            case 0x9a:
            case 0x9b:
            case 0x9c:
            case 0x9d:
            case 0x9e:
            case 0x9f:

            case 0xa0:
            case 0xa1:
            case 0xa2:
            case 0xa3:
            case 0xa4:
            case 0xa5:
            case 0xa6:
            case 0xa7:
            case 0xa8:
            case 0xa9:
            case 0xaa:
            case 0xab:
            case 0xac:
            case 0xad:
            case 0xae:
            case 0xaf:

            case 0xb0:
            case 0xb1:
            case 0xb2:
            case 0xb3:
            case 0xb4:
            case 0xb5:
            case 0xb6:
            case 0xb7:
            case 0xb8:
            case 0xb9:
            case 0xba:
            case 0xbb:
            case 0xbc:
            case 0xbd:
            case 0xbe:
            case 0xbf:
                return String.valueOf((tag - 0x90));

      /* byte int */
            case 0xc0:
            case 0xc1:
            case 0xc2:
            case 0xc3:
            case 0xc4:
            case 0xc5:
            case 0xc6:
            case 0xc7:
            case 0xc8:
            case 0xc9:
            case 0xca:
            case 0xcb:
            case 0xcc:
            case 0xcd:
            case 0xce:
            case 0xcf:
                return String.valueOf(((tag - BC_INT_BYTE_ZERO) << 8) + read());

      /* short int */
            case 0xd0:
            case 0xd1:
            case 0xd2:
            case 0xd3:
            case 0xd4:
            case 0xd5:
            case 0xd6:
            case 0xd7:
                return String.valueOf(((tag - BC_INT_SHORT_ZERO) << 16)
                        + 256 * read() + read());

            case 'I':
            case BC_LONG_INT:
                return String.valueOf(parseInt());

            // direct long
            case 0xd8:
            case 0xd9:
            case 0xda:
            case 0xdb:
            case 0xdc:
            case 0xdd:
            case 0xde:
            case 0xdf:

            case 0xe0:
            case 0xe1:
            case 0xe2:
            case 0xe3:
            case 0xe4:
            case 0xe5:
            case 0xe6:
            case 0xe7:
            case 0xe8:
            case 0xe9:
            case 0xea:
            case 0xeb:
            case 0xec:
            case 0xed:
            case 0xee:
            case 0xef:
                return String.valueOf(tag - BC_LONG_ZERO);

      /* byte long */
            case 0xf0:
            case 0xf1:
            case 0xf2:
            case 0xf3:
            case 0xf4:
            case 0xf5:
            case 0xf6:
            case 0xf7:
            case 0xf8:
            case 0xf9:
            case 0xfa:
            case 0xfb:
            case 0xfc:
            case 0xfd:
            case 0xfe:
            case 0xff:
                return String.valueOf(((tag - BC_LONG_BYTE_ZERO) << 8) + read());

      /* short long */
            case 0x38:
            case 0x39:
            case 0x3a:
            case 0x3b:
            case 0x3c:
            case 0x3d:
            case 0x3e:
            case 0x3f:
                return String.valueOf(((tag - BC_LONG_SHORT_ZERO) << 16)
                        + 256 * read() + read());

            case 'L':
                return String.valueOf(parseLong());

            case BC_DOUBLE_ZERO:
                return "0.0";

            case BC_DOUBLE_ONE:
                return "1.0";

            case BC_DOUBLE_BYTE:
                return String.valueOf((byte) (_offset < _length
                        ? _buffer[_offset++]
                        : read()));

            case BC_DOUBLE_SHORT:
                return String.valueOf(((short) (256 * read() + read())));

            case BC_DOUBLE_MILL: {
                int mills = parseInt();

                return String.valueOf(0.001 * mills);
            }

            case 'D':
                return String.valueOf(parseDouble());

            case 'S':
            case BC_STRING_CHUNK:
                _isLastChunk = tag == 'S';
                _chunkLength = (read() << 8) + read();

                _sbuf.setLength(0);
                int ch;

                while ((ch = parseChar()) >= 0)
                    _sbuf.append((char) ch);

                return _sbuf.toString();

            // 0-byte string
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07:
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0c:
            case 0x0d:
            case 0x0e:
            case 0x0f:

            case 0x10:
            case 0x11:
            case 0x12:
            case 0x13:
            case 0x14:
            case 0x15:
            case 0x16:
            case 0x17:
            case 0x18:
            case 0x19:
            case 0x1a:
            case 0x1b:
            case 0x1c:
            case 0x1d:
            case 0x1e:
            case 0x1f:
                _isLastChunk = true;
                _chunkLength = tag - 0x00;

                _sbuf.setLength(0);

                while ((ch = parseChar()) >= 0)
                    _sbuf.append((char) ch);

                return _sbuf.toString();

            case 0x30:
            case 0x31:
            case 0x32:
            case 0x33:
                _isLastChunk = true;
                _chunkLength = (tag - 0x30) * 256 + read();

                _sbuf.setLength(0);

                while ((ch = parseChar()) >= 0)
                    _sbuf.append((char) ch);

                return _sbuf.toString();

            default:
                throw expect("string", tag);
        }
    }

    /**
     * Reads a byte array
     * <p>
     * <pre>
     * B b16 b8 data value
     * </pre>
     */
    @Override
    public byte[] readBytes()
            throws IOException {
        int tag = read();

        switch (tag) {
            case 'N':
                return null;

            case 'B':
            case BC_BINARY_CHUNK:
                _isLastChunk = tag == 'B';
                _chunkLength = (read() << 8) + read();

                ByteArrayOutputStream bos = new ByteArrayOutputStream();

                int data;
                while ((data = parseByte()) >= 0)
                    bos.write(data);

                return bos.toByteArray();

            case 0x20:
            case 0x21:
            case 0x22:
            case 0x23:
            case 0x24:
            case 0x25:
            case 0x26:
            case 0x27:
            case 0x28:
            case 0x29:
            case 0x2a:
            case 0x2b:
            case 0x2c:
            case 0x2d:
            case 0x2e:
            case 0x2f: {
                _isLastChunk = true;
                _chunkLength = tag - 0x20;

                byte[] buffer = new byte[_chunkLength];

                int k = 0;
                while ((data = parseByte()) >= 0)
                    buffer[k++] = (byte) data;

                return buffer;
            }

            case 0x34:
            case 0x35:
            case 0x36:
            case 0x37: {
                _isLastChunk = true;
                _chunkLength = (tag - 0x34) * 256 + read();

                byte[] buffer = new byte[_chunkLength];
                int k = 0;

                while ((data = parseByte()) >= 0) {
                    buffer[k++] = (byte) data;
                }

                return buffer;
            }

            default:
                throw expect("bytes", tag);
        }
    }

    /**
     * Reads a byte from the stream.
     */
    public int readByte()
            throws IOException {
        if (_chunkLength > 0) {
            _chunkLength--;
            if (_chunkLength == 0 && _isLastChunk)
                _chunkLength = END_OF_DATA;

            return read();
        } else if (_chunkLength == END_OF_DATA) {
            _chunkLength = 0;
            return -1;
        }

        int tag = read();

        switch (tag) {
            case 'N':
                return -1;

            case 'B':
            case BC_BINARY_CHUNK:
                _isLastChunk = tag == 'B';
                _chunkLength = (read() << 8) + read();

                int value = parseByte();

                // special code so successive read byte won't
                // be read as a single object.
                if (_chunkLength == 0 && _isLastChunk)
                    _chunkLength = END_OF_DATA;

                return value;

            default:
                throw expect("binary", tag);
        }
    }

    /**
     * Reads a byte array from the stream.
     */
    public int readBytes(byte[] buffer, int offset, int length)
            throws IOException {
        int readLength = 0;

        if (_chunkLength == END_OF_DATA) {
            _chunkLength = 0;
            return -1;
        } else if (_chunkLength == 0) {
            int tag = read();

            switch (tag) {
                case 'N':
                    return -1;

                case 'B':
                case BC_BINARY_CHUNK:
                    _isLastChunk = tag == 'B';
                    _chunkLength = (read() << 8) + read();
                    break;

                default:
                    throw expect("binary", tag);
            }
        }

        while (length > 0) {
            if (_chunkLength > 0) {
                buffer[offset++] = (byte) read();
                _chunkLength--;
                length--;
                readLength++;
            } else if (_isLastChunk) {
                if (readLength == 0)
                    return -1;
                else {
                    _chunkLength = END_OF_DATA;
                    return readLength;
                }
            } else {
                int tag = read();

                switch (tag) {
                    case 'B':
                    case BC_BINARY_CHUNK:
                        _isLastChunk = tag == 'B';
                        _chunkLength = (read() << 8) + read();
                        break;

                    default:
                        throw expect("binary", tag);
                }
            }
        }

        if (readLength == 0)
            return -1;
        else if (_chunkLength > 0 || !_isLastChunk)
            return readLength;
        else {
            _chunkLength = END_OF_DATA;
            return readLength;
        }
    }

    /**
     * Reads a fault.
     */
    private HashMap readFault()
            throws IOException {
        HashMap map = new HashMap();

        int code = read();
        for (; code > 0 && code != 'Z'; code = read()) {
            _offset--;

            Object key = readObject();
            Object value = readObject();

            if (key != null && value != null)
                map.put(key, value);
        }

        if (code != 'Z')
            throw expect("fault", code);

        return map;
    }

    /**
     * Reads an object from the input stream with an expected type.
     */
    @Override
    public Object readObject(Class cl)
            throws IOException {
        return readObject(cl, null, null);
    }

    @Override
    public Object readObject(Class expectedClass, Class<?>... expectedTypes) throws IOException {
        if (expectedClass == null || expectedClass == Object.class)
            return readObject();

        int tag = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        switch (tag) {
            case 'N':
                return null;

            case 'H': {
                Deserializer reader = findSerializerFactory().getDeserializer(expectedClass);

                boolean keyValuePair = expectedTypes != null && expectedTypes.length == 2;
                // fix deserialize of short type
                return reader.readMap(this
                        , keyValuePair ? expectedTypes[0] : null
                        , keyValuePair ? expectedTypes[1] : null);
            }

            case 'M': {
                String type = readType();

                // hessian/3bb3
                if ("".equals(type)) {
                    Deserializer reader;
                    reader = findSerializerFactory().getDeserializer(expectedClass);

                    return reader.readMap(this);
                } else {
                    Deserializer reader;
                    reader = findSerializerFactory().getObjectDeserializer(type, expectedClass);

                    return reader.readMap(this);
                }
            }

            case 'C': {
                readObjectDefinition(expectedClass);

                return readObject(expectedClass);
            }

            case 0x60:
            case 0x61:
            case 0x62:
            case 0x63:
            case 0x64:
            case 0x65:
            case 0x66:
            case 0x67:
            case 0x68:
            case 0x69:
            case 0x6a:
            case 0x6b:
            case 0x6c:
            case 0x6d:
            case 0x6e:
            case 0x6f: {
                int ref = tag - 0x60;
                int size = _classDefs.size();

                if (ref < 0 || size <= ref)
                    throw new HessianProtocolException("'" + ref + "' is an unknown class definition");

                ObjectDefinition def = (ObjectDefinition) _classDefs.get(ref);

                return readObjectInstance(expectedClass, def);
            }

            case 'O': {
                int ref = readInt();
                int size = _classDefs.size();

                if (ref < 0 || size <= ref)
                    throw new HessianProtocolException("'" + ref + "' is an unknown class definition");

                ObjectDefinition def = (ObjectDefinition) _classDefs.get(ref);

                return readObjectInstance(expectedClass, def);
            }

            case BC_LIST_VARIABLE: {
                String type = readType();

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(type, expectedClass);

                Object v = reader.readList(this, -1);

                return v;
            }

            case BC_LIST_FIXED: {
                String type = readType();
                int length = readInt();

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(type, expectedClass);

                boolean valueType = expectedTypes != null && expectedTypes.length == 1;

                Object v = reader.readLengthList(this, length, valueType ? expectedTypes[0] : null);

                return v;
            }

            case 0x70:
            case 0x71:
            case 0x72:
            case 0x73:
            case 0x74:
            case 0x75:
            case 0x76:
            case 0x77: {
                int length = tag - 0x70;

                String type = readType();

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(null, expectedClass);

                boolean valueType = expectedTypes != null && expectedTypes.length == 1;

                // fix deserialize of short type
                Object v = reader.readLengthList(this, length, valueType ? expectedTypes[0] : null);

                return v;
            }

            case BC_LIST_VARIABLE_UNTYPED: {
                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(null, expectedClass);

                boolean valueType = expectedTypes != null && expectedTypes.length == 1;

                // fix deserialize of short type
                Object v = reader.readList(this, -1, valueType ? expectedTypes[0] : null);

                return v;
            }

            case BC_LIST_FIXED_UNTYPED: {
                int length = readInt();

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(null, expectedClass);

                boolean valueType = expectedTypes != null && expectedTypes.length == 1;

                // fix deserialize of short type
                Object v = reader.readLengthList(this, length, valueType ? expectedTypes[0] : null);

                return v;
            }

            case 0x78:
            case 0x79:
            case 0x7a:
            case 0x7b:
            case 0x7c:
            case 0x7d:
            case 0x7e:
            case 0x7f: {
                int length = tag - 0x78;

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(null, expectedClass);

                boolean valueType = expectedTypes != null && expectedTypes.length == 1;

                // fix deserialize of short type
                Object v = reader.readLengthList(this, length, valueType ? expectedTypes[0] : null);

                return v;
            }

            case BC_REF: {
                int ref = readInt();

                return _refs.get(ref);
            }
        }

        if (tag >= 0)
            _offset--;

        // hessian/3b2i vs hessian/3406
        // return readObject();
        Object value = findSerializerFactory().getDeserializer(expectedClass).readObject(this);
        return value;
    }

    /**
     * Reads an arbitrary object from the input stream when the type
     * is unknown.
     */
    @Override
    public Object readObject()
            throws IOException {
        return readObject((List<Class<?>>) null);
    }

    @Override
    public Object readObject(List<Class<?>> expectedTypes) throws IOException {
        int tag = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        switch (tag) {
            case 'N':
                return null;

            case 'T':
                return Boolean.valueOf(true);

            case 'F':
                return Boolean.valueOf(false);

            // direct integer
            case 0x80:
            case 0x81:
            case 0x82:
            case 0x83:
            case 0x84:
            case 0x85:
            case 0x86:
            case 0x87:
            case 0x88:
            case 0x89:
            case 0x8a:
            case 0x8b:
            case 0x8c:
            case 0x8d:
            case 0x8e:
            case 0x8f:

            case 0x90:
            case 0x91:
            case 0x92:
            case 0x93:
            case 0x94:
            case 0x95:
            case 0x96:
            case 0x97:
            case 0x98:
            case 0x99:
            case 0x9a:
            case 0x9b:
            case 0x9c:
            case 0x9d:
            case 0x9e:
            case 0x9f:

            case 0xa0:
            case 0xa1:
            case 0xa2:
            case 0xa3:
            case 0xa4:
            case 0xa5:
            case 0xa6:
            case 0xa7:
            case 0xa8:
            case 0xa9:
            case 0xaa:
            case 0xab:
            case 0xac:
            case 0xad:
            case 0xae:
            case 0xaf:

            case 0xb0:
            case 0xb1:
            case 0xb2:
            case 0xb3:
            case 0xb4:
            case 0xb5:
            case 0xb6:
            case 0xb7:
            case 0xb8:
            case 0xb9:
            case 0xba:
            case 0xbb:
            case 0xbc:
            case 0xbd:
            case 0xbe:
            case 0xbf:
                return Integer.valueOf(tag - BC_INT_ZERO);

            /* byte int */
            case 0xc0:
            case 0xc1:
            case 0xc2:
            case 0xc3:
            case 0xc4:
            case 0xc5:
            case 0xc6:
            case 0xc7:
            case 0xc8:
            case 0xc9:
            case 0xca:
            case 0xcb:
            case 0xcc:
            case 0xcd:
            case 0xce:
            case 0xcf:
                return Integer.valueOf(((tag - BC_INT_BYTE_ZERO) << 8) + read());

            /* short int */
            case 0xd0:
            case 0xd1:
            case 0xd2:
            case 0xd3:
            case 0xd4:
            case 0xd5:
            case 0xd6:
            case 0xd7:
                return Integer.valueOf(((tag - BC_INT_SHORT_ZERO) << 16)
                        + 256 * read() + read());

            case 'I':
                return Integer.valueOf(parseInt());

            // direct long
            case 0xd8:
            case 0xd9:
            case 0xda:
            case 0xdb:
            case 0xdc:
            case 0xdd:
            case 0xde:
            case 0xdf:

            case 0xe0:
            case 0xe1:
            case 0xe2:
            case 0xe3:
            case 0xe4:
            case 0xe5:
            case 0xe6:
            case 0xe7:
            case 0xe8:
            case 0xe9:
            case 0xea:
            case 0xeb:
            case 0xec:
            case 0xed:
            case 0xee:
            case 0xef:
                return Long.valueOf(tag - BC_LONG_ZERO);

            /* byte long */
            case 0xf0:
            case 0xf1:
            case 0xf2:
            case 0xf3:
            case 0xf4:
            case 0xf5:
            case 0xf6:
            case 0xf7:
            case 0xf8:
            case 0xf9:
            case 0xfa:
            case 0xfb:
            case 0xfc:
            case 0xfd:
            case 0xfe:
            case 0xff:
                return Long.valueOf(((tag - BC_LONG_BYTE_ZERO) << 8) + read());

            /* short long */
            case 0x38:
            case 0x39:
            case 0x3a:
            case 0x3b:
            case 0x3c:
            case 0x3d:
            case 0x3e:
            case 0x3f:
                return Long.valueOf(((tag - BC_LONG_SHORT_ZERO) << 16) + 256 * read() + read());

            case BC_LONG_INT:
                return Long.valueOf(parseInt());

            case 'L':
                return Long.valueOf(parseLong());

            case BC_DOUBLE_ZERO:
                return Double.valueOf(0);

            case BC_DOUBLE_ONE:
                return Double.valueOf(1);

            case BC_DOUBLE_BYTE:
                return Double.valueOf((byte) read());

            case BC_DOUBLE_SHORT:
                return Double.valueOf((short) (256 * read() + read()));

            case BC_DOUBLE_MILL: {
                int mills = parseInt();

                return Double.valueOf(0.001 * mills);
            }

            case 'D':
                return Double.valueOf(parseDouble());

            case BC_DATE:
                return new Date(parseLong());

            case BC_DATE_MINUTE:
                return new Date(parseInt() * 60000L);

            case BC_STRING_CHUNK:
            case 'S': {
                _isLastChunk = tag == 'S';
                _chunkLength = (read() << 8) + read();

                _sbuf.setLength(0);

                parseString(_sbuf);

                return _sbuf.toString();
            }

            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07:
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0c:
            case 0x0d:
            case 0x0e:
            case 0x0f:

            case 0x10:
            case 0x11:
            case 0x12:
            case 0x13:
            case 0x14:
            case 0x15:
            case 0x16:
            case 0x17:
            case 0x18:
            case 0x19:
            case 0x1a:
            case 0x1b:
            case 0x1c:
            case 0x1d:
            case 0x1e:
            case 0x1f: {
                _isLastChunk = true;
                _chunkLength = tag - 0x00;

                _sbuf.setLength(0);

                parseString(_sbuf);

                return _sbuf.toString();
            }

            case 0x30:
            case 0x31:
            case 0x32:
            case 0x33: {
                _isLastChunk = true;
                _chunkLength = (tag - 0x30) * 256 + read();

                _sbuf.setLength(0);

                parseString(_sbuf);

                return _sbuf.toString();
            }

            case BC_BINARY_CHUNK:
            case 'B': {
                _isLastChunk = tag == 'B';
                _chunkLength = (read() << 8) + read();

                int data;
                ByteArrayOutputStream bos = new ByteArrayOutputStream();

                while ((data = parseByte()) >= 0)
                    bos.write(data);

                return bos.toByteArray();
            }

            case 0x20:
            case 0x21:
            case 0x22:
            case 0x23:
            case 0x24:
            case 0x25:
            case 0x26:
            case 0x27:
            case 0x28:
            case 0x29:
            case 0x2a:
            case 0x2b:
            case 0x2c:
            case 0x2d:
            case 0x2e:
            case 0x2f: {
                _isLastChunk = true;
                int len = tag - 0x20;
                _chunkLength = 0;

                byte[] data = new byte[len];

                for (int i = 0; i < len; i++)
                    data[i] = (byte) read();

                return data;
            }

            case 0x34:
            case 0x35:
            case 0x36:
            case 0x37: {
                _isLastChunk = true;
                int len = (tag - 0x34) * 256 + read();
                _chunkLength = 0;

                byte[] buffer = new byte[len];

                for (int i = 0; i < len; i++) {
                    buffer[i] = (byte) read();
                }

                return buffer;
            }

            case BC_LIST_VARIABLE: {
                // variable length list
                String type = readType();

                return findSerializerFactory().readList(this, -1, type);
            }

            case BC_LIST_VARIABLE_UNTYPED: {
                return findSerializerFactory().readList(this, -1, null);
            }

            case BC_LIST_FIXED: {
                // fixed length lists
                String type = readType();
                int length = readInt();

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(type, null);

                boolean valueType = expectedTypes != null && expectedTypes.size() == 1;

                return reader.readLengthList(this, length, valueType ? expectedTypes.get(0) : null);
            }

            case BC_LIST_FIXED_UNTYPED: {
                // fixed length lists
                int length = readInt();

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(null, null);

                boolean valueType = expectedTypes != null && expectedTypes.size() == 1;

                return reader.readLengthList(this, length, valueType ? expectedTypes.get(0) : null);
            }

            // compact fixed list
            case 0x70:
            case 0x71:
            case 0x72:
            case 0x73:
            case 0x74:
            case 0x75:
            case 0x76:
            case 0x77: {
                // fixed length lists
                String type = readType();
                int length = tag - 0x70;

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(type, null);

                boolean valueType = expectedTypes != null && expectedTypes.size() == 1;

                return reader.readLengthList(this, length, valueType ? expectedTypes.get(0) : null);
            }

            // compact fixed untyped list
            case 0x78:
            case 0x79:
            case 0x7a:
            case 0x7b:
            case 0x7c:
            case 0x7d:
            case 0x7e:
            case 0x7f: {
                // fixed length lists
                int length = tag - 0x78;

                Deserializer reader;
                reader = findSerializerFactory().getListDeserializer(null, null);

                boolean valueType = expectedTypes != null && expectedTypes.size() == 1;

                return reader.readLengthList(this, length, valueType ? expectedTypes.get(0) : null);
            }

            case 'H': {

                boolean keyValuePair = expectedTypes != null && expectedTypes.size() == 2;

                // fix deserialize of short type
                Deserializer reader;
                reader = findSerializerFactory().getDeserializer(Map.class);

                return reader.readMap(this
                        , keyValuePair ? expectedTypes.get(0) : null
                        , keyValuePair ? expectedTypes.get(1) : null);
            }

            case 'M': {
                String type = readType();

                return findSerializerFactory().readMap(this, type);
            }

            case 'C': {
                readObjectDefinition(null);

                return readObject();
            }

            case 0x60:
            case 0x61:
            case 0x62:
            case 0x63:
            case 0x64:
            case 0x65:
            case 0x66:
            case 0x67:
            case 0x68:
            case 0x69:
            case 0x6a:
            case 0x6b:
            case 0x6c:
            case 0x6d:
            case 0x6e:
            case 0x6f: {
                int ref = tag - 0x60;

                if (_classDefs == null)
                    throw error("No classes defined at reference '{0}'" + tag);

                ObjectDefinition def = (ObjectDefinition) _classDefs.get(ref);

                return readObjectInstance(null, def);
            }

            case 'O': {
                int ref = readInt();

                ObjectDefinition def = (ObjectDefinition) _classDefs.get(ref);

                return readObjectInstance(null, def);
            }

            case BC_REF: {
                int ref = readInt();

                return _refs.get(ref);
            }

            default:
                if (tag < 0)
                    throw new EOFException("readObject: unexpected end of file");
                else
                    throw error("readObject: unknown code " + codeName(tag));
        }
    }

    private void parseString(StringBuilder sbuf)
            throws IOException {
        while (true) {
            if (_chunkLength <= 0) {
                if (!parseChunkLength())
                    return;
            }

            int length = _chunkLength;
            _chunkLength = 0;

            while (length-- > 0) {
                sbuf.append((char) parseUTF8Char());
            }
        }
    }

    /**
     * Reads an object definition:
     * <p>
     * <pre>
     * O string <int> (string)* <value>*
     * </pre>
     */
    private void readObjectDefinition(Class cl)
            throws IOException {
        String type = readString();
        int len = readInt();

        String[] fieldNames = new String[len];
        for (int i = 0; i < len; i++)
            fieldNames[i] = readString();

        ObjectDefinition def = new ObjectDefinition(type, fieldNames);

        if (_classDefs == null)
            _classDefs = new ArrayList();

        _classDefs.add(def);
    }

    private Object readObjectInstance(Class cl, ObjectDefinition def)
            throws IOException {
        String type = def.getType();
        String[] fieldNames = def.getFieldNames();

        if (cl != null) {
            Deserializer reader;
            reader = findSerializerFactory().getObjectDeserializer(type, cl);

            return reader.readObject(this, fieldNames);
        } else {
            return findSerializerFactory().readObject(this, type, fieldNames);
        }
    }

    private String readLenString()
            throws IOException {
        int len = readInt();

        _isLastChunk = true;
        _chunkLength = len;

        _sbuf.setLength(0);
        int ch;
        while ((ch = parseChar()) >= 0)
            _sbuf.append((char) ch);

        return _sbuf.toString();
    }

    private String readLenString(int len)
            throws IOException {
        _isLastChunk = true;
        _chunkLength = len;

        _sbuf.setLength(0);
        int ch;
        while ((ch = parseChar()) >= 0)
            _sbuf.append((char) ch);

        return _sbuf.toString();
    }

    /**
     * Reads a remote object.
     */
    @Override
    public Object readRemote()
            throws IOException {
        String type = readType();
        String url = readString();

        return resolveRemote(type, url);
    }

    /**
     * Reads a reference.
     */
    @Override
    public Object readRef()
            throws IOException {
        return _refs.get(parseInt());
    }

    /**
     * Reads the start of a list.
     */
    @Override
    public int readListStart()
            throws IOException {
        return read();
    }

    /**
     * Reads the start of a list.
     */
    @Override
    public int readMapStart()
            throws IOException {
        return read();
    }

    /**
     * Returns true if this is the end of a list or a map.
     */
    @Override
    public boolean isEnd()
            throws IOException {
        int code;

        if (_offset < _length)
            code = (_buffer[_offset] & 0xff);
        else {
            code = read();

            if (code >= 0)
                _offset--;
        }

        return (code < 0 || code == 'Z');
    }

    /**
     * Reads the end byte.
     */
    @Override
    public void readEnd()
            throws IOException {
        int code = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        if (code == 'Z')
            return;
        else if (code < 0)
            throw error("unexpected end of file");
        else
            throw error("unknown code:" + codeName(code));
    }

    /**
     * Reads the end byte.
     */
    @Override
    public void readMapEnd()
            throws IOException {
        int code = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        if (code != 'Z')
            throw error("expected end of map ('Z') at '" + codeName(code) + "'");
    }

    /**
     * Reads the end byte.
     */
    @Override
    public void readListEnd()
            throws IOException {
        int code = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        if (code != 'Z')
            throw error("expected end of list ('Z') at '" + codeName(code) + "'");
    }

    /**
     * Adds a list/map reference.
     */
    @Override
    public int addRef(Object ref) {
        if (_refs == null)
            _refs = new ArrayList();

        _refs.add(ref);

        return _refs.size() - 1;
    }

    /**
     * Adds a list/map reference.
     */
    @Override
    public void setRef(int i, Object ref) {
        _refs.set(i, ref);
    }

    /**
     * Resets the references for streaming.
     */
    @Override
    public void resetReferences() {
        if (_refs != null)
            _refs.clear();
    }

    public Object readStreamingObject()
            throws IOException {
        if (_refs != null)
            _refs.clear();

        return readObject();
    }

    /**
     * Resolves a remote object.
     */
    public Object resolveRemote(String type, String url)
            throws IOException {
        HessianRemoteResolver resolver = getRemoteResolver();

        if (resolver != null)
            return resolver.lookup(type, url);
        else
            return new HessianRemote(type, url);
    }

    /**
     * Parses a type from the stream.
     * <p>
     * <pre>
     * type ::= string
     * type ::= int
     * </pre>
     */
    @Override
    public String readType()
            throws IOException {
        int code = _offset < _length ? (_buffer[_offset++] & 0xff) : read();
        _offset--;

        switch (code) {
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07:
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0c:
            case 0x0d:
            case 0x0e:
            case 0x0f:

            case 0x10:
            case 0x11:
            case 0x12:
            case 0x13:
            case 0x14:
            case 0x15:
            case 0x16:
            case 0x17:
            case 0x18:
            case 0x19:
            case 0x1a:
            case 0x1b:
            case 0x1c:
            case 0x1d:
            case 0x1e:
            case 0x1f:

            case 0x30:
            case 0x31:
            case 0x32:
            case 0x33:
            case BC_STRING_CHUNK:
            case 'S': {
                String type = readString();

                if (_types == null)
                    _types = new ArrayList();

                _types.add(type);

                return type;
            }

            default: {
                int ref = readInt();

                if (_types.size() <= ref)
                    throw new IndexOutOfBoundsException("type ref #" + ref + " is greater than the number of valid types (" + _types.size() + ")");

                return (String) _types.get(ref);
            }
        }
    }

    /**
     * Parses the length for an array
     * <p>
     * <pre>
     * l b32 b24 b16 b8
     * </pre>
     */
    @Override
    public int readLength()
            throws IOException {
        throw new UnsupportedOperationException();
    }

    /**
     * Parses a 32-bit integer value from the stream.
     * <p>
     * <pre>
     * b32 b24 b16 b8
     * </pre>
     */
    private int parseInt()
            throws IOException {
        int offset = _offset;

        if (offset + 3 < _length) {
            byte[] buffer = _buffer;

            int b32 = buffer[offset + 0] & 0xff;
            int b24 = buffer[offset + 1] & 0xff;
            int b16 = buffer[offset + 2] & 0xff;
            int b8 = buffer[offset + 3] & 0xff;

            _offset = offset + 4;

            return (b32 << 24) + (b24 << 16) + (b16 << 8) + b8;
        } else {
            int b32 = read();
            int b24 = read();
            int b16 = read();
            int b8 = read();

            return (b32 << 24) + (b24 << 16) + (b16 << 8) + b8;
        }
    }

    /**
     * Parses a 64-bit long value from the stream.
     * <p>
     * <pre>
     * b64 b56 b48 b40 b32 b24 b16 b8
     * </pre>
     */
    private long parseLong()
            throws IOException {
        long b64 = read();
        long b56 = read();
        long b48 = read();
        long b40 = read();
        long b32 = read();
        long b24 = read();
        long b16 = read();
        long b8 = read();

        return ((b64 << 56)
                + (b56 << 48)
                + (b48 << 40)
                + (b40 << 32)
                + (b32 << 24)
                + (b24 << 16)
                + (b16 << 8)
                + b8);
    }

    /**
     * Parses a 64-bit double value from the stream.
     * <p>
     * <pre>
     * b64 b56 b48 b40 b32 b24 b16 b8
     * </pre>
     */
    private double parseDouble()
            throws IOException {
        long bits = parseLong();

        return Double.longBitsToDouble(bits);
    }

    org.w3c.dom.Node parseXML()
            throws IOException {
        throw new UnsupportedOperationException();
    }

    private boolean parseChunkLength()
            throws IOException {
        if (_isLastChunk)
            return false;

        int code = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        switch (code) {
            case BC_STRING_CHUNK:
                _isLastChunk = false;

                _chunkLength = (read() << 8) + read();
                break;

            case 'S':
                _isLastChunk = true;

                _chunkLength = (read() << 8) + read();
                break;

            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07:
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0c:
            case 0x0d:
            case 0x0e:
            case 0x0f:

            case 0x10:
            case 0x11:
            case 0x12:
            case 0x13:
            case 0x14:
            case 0x15:
            case 0x16:
            case 0x17:
            case 0x18:
            case 0x19:
            case 0x1a:
            case 0x1b:
            case 0x1c:
            case 0x1d:
            case 0x1e:
            case 0x1f:
                _isLastChunk = true;
                _chunkLength = code - 0x00;
                break;

            case 0x30:
            case 0x31:
            case 0x32:
            case 0x33:
                _isLastChunk = true;
                _chunkLength = (code - 0x30) * 256 + read();
                break;

            default:
                throw expect("string", code);
        }

        return true;
    }

    /**
     * Reads a character from the underlying stream.
     */
    private int parseChar()
            throws IOException {
        while (_chunkLength <= 0) {
            if (!parseChunkLength())
                return -1;
        }

        _chunkLength--;

        return parseUTF8Char();
    }

    /**
     * Parses a single UTF8 character.
     */
    private int parseUTF8Char()
            throws IOException {
        int ch = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

        if (ch < 0x80)
            return ch;
        else if ((ch & 0xe0) == 0xc0) {
            int ch1 = read();
            int v = ((ch & 0x1f) << 6) + (ch1 & 0x3f);

            return v;
        } else if ((ch & 0xf0) == 0xe0) {
            int ch1 = read();
            int ch2 = read();
            int v = ((ch & 0x0f) << 12) + ((ch1 & 0x3f) << 6) + (ch2 & 0x3f);

            return v;
        } else
            throw error("bad utf-8 encoding at " + codeName(ch));
    }

    /**
     * Reads a byte from the underlying stream.
     */
    private int parseByte()
            throws IOException {
        while (_chunkLength <= 0) {
            if (_isLastChunk) {
                return -1;
            }

            int code = read();

            switch (code) {
                case BC_BINARY_CHUNK:
                    _isLastChunk = false;

                    _chunkLength = (read() << 8) + read();
                    break;

                case 'B':
                    _isLastChunk = true;

                    _chunkLength = (read() << 8) + read();
                    break;

                case 0x20:
                case 0x21:
                case 0x22:
                case 0x23:
                case 0x24:
                case 0x25:
                case 0x26:
                case 0x27:
                case 0x28:
                case 0x29:
                case 0x2a:
                case 0x2b:
                case 0x2c:
                case 0x2d:
                case 0x2e:
                case 0x2f:
                    _isLastChunk = true;

                    _chunkLength = code - 0x20;
                    break;

                case 0x34:
                case 0x35:
                case 0x36:
                case 0x37:
                    _isLastChunk = true;
                    _chunkLength = (code - 0x34) * 256 + read();
                    break;

                default:
                    throw expect("byte[]", code);
            }
        }

        _chunkLength--;

        return read();
    }

    /**
     * Reads bytes based on an input stream.
     */
    @Override
    public InputStream readInputStream()
            throws IOException {
        int tag = read();

        switch (tag) {
            case 'N':
                return null;

            case 'B':
            case 'b':
                _isLastChunk = tag == 'B';
                _chunkLength = (read() << 8) + read();
                break;

            case 0x20:
            case 0x21:
            case 0x22:
            case 0x23:
            case 0x24:
            case 0x25:
            case 0x26:
            case 0x27:
            case 0x28:
            case 0x29:
            case 0x2a:
            case 0x2b:
            case 0x2c:
            case 0x2d:
            case 0x2e:
            case 0x2f:
                _isLastChunk = true;
                _chunkLength = tag - 0x20;
                break;

            default:
                throw expect("binary", tag);
        }

        return new ReadInputStream();
    }

    /**
     * Reads bytes from the underlying stream.
     */
    int read(byte[] buffer, int offset, int length)
            throws IOException {
        int readLength = 0;

        while (length > 0) {
            while (_chunkLength <= 0) {
                if (_isLastChunk)
                    return readLength == 0 ? -1 : readLength;

                int code = read();

                switch (code) {
                    case 'b':
                        _isLastChunk = false;

                        _chunkLength = (read() << 8) + read();
                        break;

                    case 'B':
                        _isLastChunk = true;

                        _chunkLength = (read() << 8) + read();
                        break;

                    case 0x20:
                    case 0x21:
                    case 0x22:
                    case 0x23:
                    case 0x24:
                    case 0x25:
                    case 0x26:
                    case 0x27:
                    case 0x28:
                    case 0x29:
                    case 0x2a:
                    case 0x2b:
                    case 0x2c:
                    case 0x2d:
                    case 0x2e:
                    case 0x2f:
                        _isLastChunk = true;
                        _chunkLength = code - 0x20;
                        break;

                    default:
                        throw expect("byte[]", code);
                }
            }

            int sublen = _chunkLength;
            if (length < sublen)
                sublen = length;

            if (_length <= _offset && !readBuffer())
                return -1;

            if (_length - _offset < sublen)
                sublen = _length - _offset;

            System.arraycopy(_buffer, _offset, buffer, offset, sublen);

            _offset += sublen;

            offset += sublen;
            readLength += sublen;
            length -= sublen;
            _chunkLength -= sublen;
        }

        return readLength;
    }

    /**
     * Normally, shouldn't be called externally, but needed for QA, e.g.
     * ejb/3b01.
     */
    public final int read()
            throws IOException {
        if (_length <= _offset && !readBuffer())
            return -1;

        return _buffer[_offset++] & 0xff;
    }

    private final boolean readBuffer()
            throws IOException {
        byte[] buffer = _buffer;
        int offset = _offset;
        int length = _length;

        if (offset < length) {
            System.arraycopy(buffer, offset, buffer, 0, length - offset);
            offset = length - offset;
        } else
            offset = 0;

        int len = _is.read(buffer, offset, SIZE - offset);

        if (len <= 0) {
            _length = offset;
            _offset = 0;

            return offset > 0;
        }

        _length = offset + len;
        _offset = 0;

        return true;
    }

    @Override
    public Reader getReader() {
        return null;
    }

    protected IOException expect(String expect, int ch)
            throws IOException {
        if (ch < 0)
            return error("expected " + expect + " at end of file");
        else {
            _offset--;

            try {
                Object obj = readObject();

                if (obj != null) {
                    return error("expected " + expect
                            + " at 0x" + Integer.toHexString(ch & 0xff)
                            + " " + obj.getClass().getName() + " (" + obj + ")");
                } else
                    return error("expected " + expect
                            + " at 0x" + Integer.toHexString(ch & 0xff) + " null");
            } catch (IOException e) {
                log.log(Level.FINE, e.toString(), e);

                return error("expected " + expect
                        + " at 0x" + Integer.toHexString(ch & 0xff));
            }
        }
    }

    protected String codeName(int ch) {
        if (ch < 0)
            return "end of file";
        else
            return "0x" + Integer.toHexString(ch & 0xff) + " (" + (char) +ch + ")";
    }

    protected IOException error(String message) {
        if (_method != null)
            return new HessianProtocolException(_method + ": " + message);
        else
            return new HessianProtocolException(message);
    }

    @Override
    public void close()
            throws IOException {
        InputStream is = _is;
        _is = null;

        if (_isCloseStreamOnClose && is != null)
            is.close();
    }

    ;

    final static class ObjectDefinition {
        private final String _type;
        private final String[] _fields;

        ObjectDefinition(String type, String[] fields) {
            _type = type;
            _fields = fields;
        }

        String getType() {
            return _type;
        }

        String[] getFieldNames() {
            return _fields;
        }
    }

    class ReadInputStream extends InputStream {
        boolean _isClosed = false;

        @Override
        public int read()
                throws IOException {
            if (_isClosed)
                return -1;

            int ch = parseByte();
            if (ch < 0)
                _isClosed = true;

            return ch;
        }

        @Override
        public int read(byte[] buffer, int offset, int length)
                throws IOException {
            if (_isClosed)
                return -1;

            int len = Hessian2Input.this.read(buffer, offset, length);
            if (len < 0)
                _isClosed = true;

            return len;
        }

        @Override
        public void close()
                throws IOException {
            while (read() >= 0) {
            }
        }
    }
}