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SMB2 protocol library for communication with Windows servers

There is a newer version: 0.13.0

/*
 * Copyright (C)2016 - SMBJ Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.hierynomus.smbj.transport.tcp;

import com.hierynomus.mssmb2.SMB2Packet;
import com.hierynomus.mssmb2.messages.SMB2ResponseMessageFactory;
import com.hierynomus.protocol.Packet;
import com.hierynomus.protocol.commons.buffer.Buffer;
import com.hierynomus.protocol.commons.buffer.Endian;
import com.hierynomus.smbj.common.SMBBuffer;
import com.hierynomus.smbj.transport.PacketReader;
import com.hierynomus.smbj.transport.PacketReceiver;
import com.hierynomus.smbj.transport.TransportException;

import java.io.IOException;
import java.io.InputStream;

public class DirectTcpPacketReader extends PacketReader {

    public DirectTcpPacketReader(InputStream in, PacketReceiver handler) {
        super(in, handler);
    }

    private SMB2Packet _readSMB2Packet(int packetLength) throws IOException, Buffer.BufferException {
        byte[] buf = new byte[packetLength];
        int count = 0;
        int read = 0;
        while (count < packetLength && ((read = in.read(buf, count, packetLength - count)) != -1)) {
            count += read;
        }
        if (read == -1) {
            throw new TransportException("EOF while reading packet");
        }

        SMBBuffer buffer = new SMBBuffer(buf);
        return SMB2ResponseMessageFactory.read(buffer);
    }

    @Override
    protected Packet doRead() throws TransportException {
        try {
            int smb2PacketLength = _readTcpHeader();
            return _readSMB2Packet(smb2PacketLength);
        } catch (IOException | Buffer.BufferException e) {
            throw new TransportException(e);
        }
    }

    private int _readTcpHeader() throws IOException, Buffer.BufferException {
        byte[] tcpHeader = new byte[4];
        in.read(tcpHeader);
        Buffer.PlainBuffer plainBuffer = new Buffer.PlainBuffer(tcpHeader, Endian.BE);
        plainBuffer.readByte();
        int packetLength = plainBuffer.readUInt24();
        return packetLength;
    }
}