Android Open Source - USBIPServerForAndroid Common Packet

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.cgutman.usbip.server.protocol.cli;
//from  ww w . jav a2 s . com
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

import org.cgutman.usbip.server.protocol.ProtoDefs;
import org.cgutman.usbip.utils.StreamUtils;

public abstract class CommonPacket {
  public short version;
  public short code;
  public int status;
  
  public CommonPacket(byte[] header) {
    ByteBuffer bb = ByteBuffer.wrap(header);
    
    version = bb.getShort();
    code = bb.getShort();
    status = bb.getInt();
  }
  
  public CommonPacket(short version, short code, int status) {
    this.version = version;
    this.code = code;
    this.status = status;
  }
  
  public static CommonPacket read(InputStream in) throws IOException {
    ByteBuffer bb = ByteBuffer.allocate(8);
    StreamUtils.readAll(in, bb.array());
    
    // We should check the version here, but it seems they like to
    // increment it without actually changing the protocol, so I'm
    // not going to.
    bb.getShort();
    
    CommonPacket pkt;
    short code = bb.getShort();
    switch (code)
    {
    case ProtoDefs.OP_REQ_DEVLIST:
      pkt = new DevListRequest(bb.array());
      break;
    case ProtoDefs.OP_REQ_IMPORT:
      pkt = new ImportDeviceRequest(bb.array());
      ((ImportDeviceRequest)pkt).populateInternal(in);
      break;
    default:
      System.err.println("Unsupported code: "+code);
      return null;
    }
    
    return pkt;
  }
  
  protected abstract byte[] serializeInternal();
  
  public byte[] serialize() {
    byte[] internalData = serializeInternal();
    
    int internalLen = internalData == null ? 0 : internalData.length;
    ByteBuffer bb = ByteBuffer.allocate(8 + internalLen);
    
    bb.putShort(version);
    bb.putShort(code);
    bb.putInt(status);
    
    if (internalLen != 0) {
      bb.put(internalData);
    }
    
    return bb.array();
  }
}

Java Source Code List