jcifs.internal.smb2.io.Smb2ReadResponse Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of jcifs-ng Show documentation
A pure-java CIFS/SMB client library
There is a newer version: 2.1.10
/*
 * © 2017 AgNO3 Gmbh & Co. KG
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.smb2.io;


import jcifs.Configuration;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.internal.smb2.ServerMessageBlock2Response;
import jcifs.internal.smb2.Smb2Constants;
import jcifs.internal.util.SMBUtil;
import jcifs.smb.NtStatus;


/**
 * @author mbechler
 *
 */
public class Smb2ReadResponse extends ServerMessageBlock2Response {

    /**
     * 
     */
    public static final int OVERHEAD = Smb2Constants.SMB2_HEADER_LENGTH + 16;

    private int dataRemaining;
    private int dataLength;
    private byte[] outputBuffer;
    private int outputBufferOffset;


    /**
     * @param config
     * @param outputBufferOffset
     * @param outputBuffer
     */
    public Smb2ReadResponse ( Configuration config, byte[] outputBuffer, int outputBufferOffset ) {
        super(config);
        this.outputBuffer = outputBuffer;
        this.outputBufferOffset = outputBufferOffset;
    }


    /**
     * @return the dataLength
     */
    public int getDataLength () {
        return this.dataLength;
    }


    /**
     * @return the dataRemaining
     */
    public int getDataRemaining () {
        return this.dataRemaining;
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#writeBytesWireFormat(byte[], int)
     */
    @Override
    protected int writeBytesWireFormat ( byte[] dst, int dstIndex ) {
        return 0;
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#readBytesWireFormat(byte[], int)
     */
    @Override
    protected int readBytesWireFormat ( byte[] buffer, int bufferIndex ) throws SMBProtocolDecodingException {
        int start = bufferIndex;
        int structureSize = SMBUtil.readInt2(buffer, bufferIndex);
        if ( structureSize == 9 ) {
            return this.readErrorResponse(buffer, bufferIndex);
        }
        else if ( structureSize != 17 ) {
            throw new SMBProtocolDecodingException("Expected structureSize = 17");
        }

        short dataOffset = buffer[ bufferIndex + 2 ];
        bufferIndex += 4;
        this.dataLength = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;
        this.dataRemaining = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;
        bufferIndex += 4; // Reserved2

        int dataStart = getHeaderStart() + dataOffset;

        if ( this.dataLength + this.outputBufferOffset > this.outputBuffer.length ) {
            throw new SMBProtocolDecodingException("Buffer to small for read response");
        }
        System.arraycopy(buffer, dataStart, this.outputBuffer, this.outputBufferOffset, this.dataLength);
        bufferIndex = Math.max(bufferIndex, dataStart + this.dataLength);
        return bufferIndex - start;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb2.ServerMessageBlock2#isErrorResponseStatus()
     */
    @Override
    protected boolean isErrorResponseStatus () {
        return getStatus() != NtStatus.NT_STATUS_BUFFER_OVERFLOW && super.isErrorResponseStatus();
    }


}