// Path: src/main/java/sockslib/common/SocksException.java
// public class SocksException extends IOException {
// 
//   /**
//    * Serial version UID.
//    */
//   private static final long serialVersionUID = 1L;
// 
//   private static final String NO_ACCEPTABLE_METHODS = "NO ACCEPTABLE METHODS";
//   /**
//    * Messages that server will reply.
//    */
//   private static final String serverReplyMessage[] =
//       {"General SOCKS server failure", "Connection not allowed by ruleset",
//           "Network " + "unreachable", "Host unreachable", "Connection refused", "TTL expired",
//           "Command not " + "supported", "Address type not supported"};
//   /**
//    * Reply from SOCKS server.
//    */
//   private ServerReply serverReply;
// 
//   /**
//    * Constructs an instance of {@link SocksException} with a message.
//    *
//    * @param msg Message.
//    */
//   public SocksException(String msg) {
//     super(msg);
//   }
// 
//   /**
//    * Constructs an instance of {@link SocksException} with a code.
//    *
//    * @param replyCode The code that server Replied.
//    */
//   public SocksException(int replyCode) {
// 
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message "NO ACCEPTABLE METHODS".
//    *
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException noAcceptableMethods() {
//     return new SocksException(NO_ACCEPTABLE_METHODS);
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message "Protocol not supported".
//    *
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException protocolNotSupported() {
//     return new SocksException("Protocol not supported");
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message of reply.
//    *
//    * @param reply Server's reply.
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException serverReplyException(ServerReply reply) {
//     SocksException ex = serverReplyException(reply.getValue());
//     ex.setServerReply(reply);
//     return ex;
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message of reply.
//    *
//    * @param reply Code of server's reply.
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException serverReplyException(byte reply) {
//     int code = reply;
//     code = code & 0xff;
//     if (code < 0 || code > 0x08) {
//       return new SocksException("Unknown reply");
//     }
//     code = code - 1;
//     return new SocksException(serverReplyMessage[code]);
//   }
// 
//   /**
//    * Returns server's reply.
//    *
//    * @return Server's reply.
//    */
//   public ServerReply getServerReply() {
//     return serverReply;
//   }
// 
//   /**
//    * Sets server's reply.
//    *
//    * @param serverReply Reply of the server.
//    */
//   public void setServerReply(ServerReply serverReply) {
//     this.serverReply = serverReply;
//   }
// 
// }
// 
// Path: src/main/java/sockslib/utils/StreamUtil.java
// public static int checkEnd(int b) throws IOException {
//   if (b < 0) {
//     throw new IOException("End of stream");
//   } else {
//     return b;
//   }
// }


import sockslib.common.SocksException;
import java.io.IOException;
import java.io.InputStream;
import static sockslib.utils.StreamUtil.checkEnd;
/*
 * Copyright 2015-2025 the original author or authors.
 * 
 * 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 sockslib.server.msg;




/**
 * The class <code>MethodSelectionMessage</code> represents a method selection message.
 *
 * @author Youchao Feng
 * @version 1.0
 * @date Apr 5, 2015 10:47:05 AM
 */
public class MethodSelectionMessage implements ReadableMessage, WritableMessage {

  private int version;

  private int methodNum;

  private int[] methods;

  @Override
  public byte[] getBytes() {
    byte[] bytes = new byte[2 + methodNum];

    bytes[0] = (byte) version;
    bytes[1] = (byte) methodNum;
    for (int i = 0; i < methods.length; i++) {
      bytes[i + 2] = (byte) methods[i];
    }
    return bytes;
  }

  @Override
  public int getLength() {
    return getBytes().length;
  }


  @Override
  public void read(InputStream inputStream) throws SocksException, IOException {
// Path: src/main/java/sockslib/common/SocksException.java
// public class SocksException extends IOException {
// 
//   /**
//    * Serial version UID.
//    */
//   private static final long serialVersionUID = 1L;
// 
//   private static final String NO_ACCEPTABLE_METHODS = "NO ACCEPTABLE METHODS";
//   /**
//    * Messages that server will reply.
//    */
//   private static final String serverReplyMessage[] =
//       {"General SOCKS server failure", "Connection not allowed by ruleset",
//           "Network " + "unreachable", "Host unreachable", "Connection refused", "TTL expired",
//           "Command not " + "supported", "Address type not supported"};
//   /**
//    * Reply from SOCKS server.
//    */
//   private ServerReply serverReply;
// 
//   /**
//    * Constructs an instance of {@link SocksException} with a message.
//    *
//    * @param msg Message.
//    */
//   public SocksException(String msg) {
//     super(msg);
//   }
// 
//   /**
//    * Constructs an instance of {@link SocksException} with a code.
//    *
//    * @param replyCode The code that server Replied.
//    */
//   public SocksException(int replyCode) {
// 
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message "NO ACCEPTABLE METHODS".
//    *
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException noAcceptableMethods() {
//     return new SocksException(NO_ACCEPTABLE_METHODS);
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message "Protocol not supported".
//    *
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException protocolNotSupported() {
//     return new SocksException("Protocol not supported");
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message of reply.
//    *
//    * @param reply Server's reply.
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException serverReplyException(ServerReply reply) {
//     SocksException ex = serverReplyException(reply.getValue());
//     ex.setServerReply(reply);
//     return ex;
//   }
// 
//   /**
//    * Returns a {@link SocksException} instance with a message of reply.
//    *
//    * @param reply Code of server's reply.
//    * @return An instance of {@link SocksException}.
//    */
//   public static SocksException serverReplyException(byte reply) {
//     int code = reply;
//     code = code & 0xff;
//     if (code < 0 || code > 0x08) {
//       return new SocksException("Unknown reply");
//     }
//     code = code - 1;
//     return new SocksException(serverReplyMessage[code]);
//   }
// 
//   /**
//    * Returns server's reply.
//    *
//    * @return Server's reply.
//    */
//   public ServerReply getServerReply() {
//     return serverReply;
//   }
// 
//   /**
//    * Sets server's reply.
//    *
//    * @param serverReply Reply of the server.
//    */
//   public void setServerReply(ServerReply serverReply) {
//     this.serverReply = serverReply;
//   }
// 
// }
// 
// Path: src/main/java/sockslib/utils/StreamUtil.java
// public static int checkEnd(int b) throws IOException {
//   if (b < 0) {
//     throw new IOException("End of stream");
//   } else {
//     return b;
//   }
// }


// Path: src/main/java/sockslib/server/msg/MethodSelectionMessage.java
import sockslib.common.SocksException;
import java.io.IOException;
import java.io.InputStream;
import static sockslib.utils.StreamUtil.checkEnd;

/*
 * Copyright 2015-2025 the original author or authors.
 * 
 * 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 sockslib.server.msg;




/**
 * The class <code>MethodSelectionMessage</code> represents a method selection message.
 *
 * @author Youchao Feng
 * @version 1.0
 * @date Apr 5, 2015 10:47:05 AM
 */
public class MethodSelectionMessage implements ReadableMessage, WritableMessage {

  private int version;

  private int methodNum;

  private int[] methods;

  @Override
  public byte[] getBytes() {
    byte[] bytes = new byte[2 + methodNum];

    bytes[0] = (byte) version;
    bytes[1] = (byte) methodNum;
    for (int i = 0; i < methods.length; i++) {
      bytes[i + 2] = (byte) methods[i];
    }
    return bytes;
  }

  @Override
  public int getLength() {
    return getBytes().length;
  }


  @Override
  public void read(InputStream inputStream) throws SocksException, IOException {
    version = checkEnd(inputStream.read());