http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
public class io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder extends io.netty.handler.codec.ReplayingDecoder<io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder
  super_class: io.netty.handler.codec.ReplayingDecoder
{
  private static volatile int[] $SWITCH_TABLE$io$netty$handler$codec$socksx$v5$Socks5PasswordAuthRequestDecoder$State;
    descriptor: [I
    flags: (0x104a) ACC_PRIVATE, ACC_STATIC, ACC_VOLATILE, ACC_SYNTHETIC

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder this
         0: .line 44
            aload 0 /* this */
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.INIT:Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            invokespecial io.netty.handler.codec.ReplayingDecoder.<init>:(Ljava/lang/Object;)V
         1: .line 45
            return
        end local 0 // io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder;

  protected void decode(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, java.util.List<java.lang.Object>);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;Ljava/util/List;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=8, locals=9, args_size=4
        start local 0 // io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.buffer.ByteBuf in
        start local 3 // java.util.List out
         0: .line 50
            invokestatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.$SWITCH_TABLE$io$netty$handler$codec$socksx$v5$Socks5PasswordAuthRequestDecoder$State:()[I
            aload 0 /* this */
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.state:()Ljava/lang/Object;
            checkcast io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.ordinal:()I
            iaload
            tableswitch { // 1 - 3
                    1: 1
                    2: 14
                    3: 18
              default: 19
          }
         1: .line 52
      StackMap locals:
      StackMap stack:
            aload 2 /* in */
            invokevirtual io.netty.buffer.ByteBuf.readerIndex:()I
            istore 4 /* startOffset */
        start local 4 // int startOffset
         2: .line 53
            aload 2 /* in */
            iload 4 /* startOffset */
            invokevirtual io.netty.buffer.ByteBuf.getByte:(I)B
            istore 5 /* version */
        start local 5 // byte version
         3: .line 54
            iload 5 /* version */
            iconst_1
            if_icmpeq 5
         4: .line 55
            new io.netty.handler.codec.DecoderException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unsupported subnegotiation version: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 5 /* version */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " (expected: 1)"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial io.netty.handler.codec.DecoderException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 58
      StackMap locals: int int
      StackMap stack:
            aload 2 /* in */
            iload 4 /* startOffset */
            iconst_1
            iadd
            invokevirtual io.netty.buffer.ByteBuf.getUnsignedByte:(I)S
            istore 6 /* usernameLength */
        start local 6 // int usernameLength
         6: .line 59
            aload 2 /* in */
            iload 4 /* startOffset */
            iconst_2
            iadd
            iload 6 /* usernameLength */
            iadd
            invokevirtual io.netty.buffer.ByteBuf.getUnsignedByte:(I)S
            istore 7 /* passwordLength */
        start local 7 // int passwordLength
         7: .line 60
            iload 6 /* usernameLength */
            iload 7 /* passwordLength */
            iadd
            iconst_3
            iadd
            istore 8 /* totalLength */
        start local 8 // int totalLength
         8: .line 62
            aload 2 /* in */
            iload 8 /* totalLength */
            invokevirtual io.netty.buffer.ByteBuf.skipBytes:(I)Lio/netty/buffer/ByteBuf;
            pop
         9: .line 63
            aload 3 /* out */
            new io.netty.handler.codec.socksx.v5.DefaultSocks5PasswordAuthRequest
            dup
        10: .line 64
            aload 2 /* in */
            iload 4 /* startOffset */
            iconst_2
            iadd
            iload 6 /* usernameLength */
            getstatic io.netty.util.CharsetUtil.US_ASCII:Ljava/nio/charset/Charset;
            invokevirtual io.netty.buffer.ByteBuf.toString:(IILjava/nio/charset/Charset;)Ljava/lang/String;
        11: .line 65
            aload 2 /* in */
            iload 4 /* startOffset */
            iconst_3
            iadd
            iload 6 /* usernameLength */
            iadd
            iload 7 /* passwordLength */
            getstatic io.netty.util.CharsetUtil.US_ASCII:Ljava/nio/charset/Charset;
            invokevirtual io.netty.buffer.ByteBuf.toString:(IILjava/nio/charset/Charset;)Ljava/lang/String;
            invokespecial io.netty.handler.codec.socksx.v5.DefaultSocks5PasswordAuthRequest.<init>:(Ljava/lang/String;Ljava/lang/String;)V
        12: .line 63
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        13: .line 67
            aload 0 /* this */
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.SUCCESS:Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.checkpoint:(Ljava/lang/Object;)V
        end local 8 // int totalLength
        end local 7 // int passwordLength
        end local 6 // int usernameLength
        end local 5 // byte version
        end local 4 // int startOffset
        14: .line 70
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.actualReadableBytes:()I
            istore 4 /* readableBytes */
        start local 4 // int readableBytes
        15: .line 71
            iload 4 /* readableBytes */
            ifle 22
        16: .line 72
            aload 3 /* out */
            aload 2 /* in */
            iload 4 /* readableBytes */
            invokevirtual io.netty.buffer.ByteBuf.readRetainedSlice:(I)Lio/netty/buffer/ByteBuf;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        17: .line 74
            goto 22
        end local 4 // int readableBytes
        18: .line 77
      StackMap locals:
      StackMap stack:
            aload 2 /* in */
            aload 0 /* this */
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.actualReadableBytes:()I
            invokevirtual io.netty.buffer.ByteBuf.skipBytes:(I)Lio/netty/buffer/ByteBuf;
            pop
        19: .line 81
      StackMap locals:
      StackMap stack:
            goto 22
      StackMap locals:
      StackMap stack: java.lang.Exception
        20: astore 4 /* e */
        start local 4 // java.lang.Exception e
        21: .line 82
            aload 0 /* this */
            aload 3 /* out */
            aload 4 /* e */
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.fail:(Ljava/util/List;Ljava/lang/Exception;)V
        end local 4 // java.lang.Exception e
        22: .line 84
      StackMap locals:
      StackMap stack:
            return
        end local 3 // java.util.List out
        end local 2 // io.netty.buffer.ByteBuf in
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0   23     0            this  Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder;
            0   23     1             ctx  Lio/netty/channel/ChannelHandlerContext;
            0   23     2              in  Lio/netty/buffer/ByteBuf;
            0   23     3             out  Ljava/util/List<Ljava/lang/Object;>;
            2   14     4     startOffset  I
            3   14     5         version  B
            6   14     6  usernameLength  I
            7   14     7  passwordLength  I
            8   14     8     totalLength  I
           15   18     4   readableBytes  I
           21   22     4               e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           0    19      20  Class java.lang.Exception
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;Ljava/util/List<Ljava/lang/Object;>;)V
    MethodParameters:
      Name  Flags
      ctx   
      in    
      out   

  private void fail(java.util.List<java.lang.Object>, java.lang.Exception);
    descriptor: (Ljava/util/List;Ljava/lang/Exception;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=4, args_size=3
        start local 0 // io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder this
        start local 1 // java.util.List out
        start local 2 // java.lang.Exception cause
         0: .line 87
            aload 2 /* cause */
            instanceof io.netty.handler.codec.DecoderException
            ifne 2
         1: .line 88
            new io.netty.handler.codec.DecoderException
            dup
            aload 2 /* cause */
            invokespecial io.netty.handler.codec.DecoderException.<init>:(Ljava/lang/Throwable;)V
            astore 2 /* cause */
         2: .line 91
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.FAILURE:Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.checkpoint:(Ljava/lang/Object;)V
         3: .line 93
            new io.netty.handler.codec.socksx.v5.DefaultSocks5PasswordAuthRequest
            dup
            ldc ""
            ldc ""
            invokespecial io.netty.handler.codec.socksx.v5.DefaultSocks5PasswordAuthRequest.<init>:(Ljava/lang/String;Ljava/lang/String;)V
            astore 3 /* m */
        start local 3 // io.netty.handler.codec.socksx.v5.Socks5Message m
         4: .line 94
            aload 3 /* m */
            aload 2 /* cause */
            invokestatic io.netty.handler.codec.DecoderResult.failure:(Ljava/lang/Throwable;)Lio/netty/handler/codec/DecoderResult;
            invokeinterface io.netty.handler.codec.socksx.v5.Socks5Message.setDecoderResult:(Lio/netty/handler/codec/DecoderResult;)V
         5: .line 95
            aload 1 /* out */
            aload 3 /* m */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         6: .line 96
            return
        end local 3 // io.netty.handler.codec.socksx.v5.Socks5Message m
        end local 2 // java.lang.Exception cause
        end local 1 // java.util.List out
        end local 0 // io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    7     0   this  Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder;
            0    7     1    out  Ljava/util/List<Ljava/lang/Object;>;
            0    7     2  cause  Ljava/lang/Exception;
            4    7     3      m  Lio/netty/handler/codec/socksx/v5/Socks5Message;
    Signature: (Ljava/util/List<Ljava/lang/Object;>;Ljava/lang/Exception;)V
    MethodParameters:
       Name  Flags
      out    
      cause  

  static int[] $SWITCH_TABLE$io$netty$handler$codec$socksx$v5$Socks5PasswordAuthRequestDecoder$State();
    descriptor: ()[I
    flags: (0x1008) ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=3, locals=1, args_size=0
         0: .line 35
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.$SWITCH_TABLE$io$netty$handler$codec$socksx$v5$Socks5PasswordAuthRequestDecoder$State:[I
            dup
            ifnull 1
            areturn
      StackMap locals:
      StackMap stack: int[]
         1: pop
            invokestatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.values:()[Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            arraylength
            newarray 10
            astore 0
         2: aload 0
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.FAILURE:Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.ordinal:()I
            iconst_3
            iastore
         3: goto 5
      StackMap locals: int[]
      StackMap stack: java.lang.NoSuchFieldError
         4: pop
      StackMap locals:
      StackMap stack:
         5: aload 0
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.INIT:Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.ordinal:()I
            iconst_1
            iastore
         6: goto 8
      StackMap locals:
      StackMap stack: java.lang.NoSuchFieldError
         7: pop
      StackMap locals:
      StackMap stack:
         8: aload 0
            getstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.SUCCESS:Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;
            invokevirtual io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State.ordinal:()I
            iconst_2
            iastore
         9: goto 11
      StackMap locals:
      StackMap stack: java.lang.NoSuchFieldError
        10: pop
      StackMap locals:
      StackMap stack:
        11: aload 0
            dup
            putstatic io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder.$SWITCH_TABLE$io$netty$handler$codec$socksx$v5$Socks5PasswordAuthRequestDecoder$State:[I
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
      Exception table:
        from    to  target  type
           2     3       4  Class java.lang.NoSuchFieldError
           5     6       7  Class java.lang.NoSuchFieldError
           8     9      10  Class java.lang.NoSuchFieldError
}
Signature: Lio/netty/handler/codec/ReplayingDecoder<Lio/netty/handler/codec/socksx/v5/Socks5PasswordAuthRequestDecoder$State;>;
SourceFile: "Socks5PasswordAuthRequestDecoder.java"
NestMembers:
  io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State
InnerClasses:
  final State = io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder$State of io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequestDecoder