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.http.websocketx.WebSocket00FrameEncoder extends io.netty.handler.codec.MessageToMessageEncoder<io.netty.handler.codec.http.websocketx.WebSocketFrame> implements io.netty.handler.codec.http.websocketx.WebSocketFrameEncoder
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder
  super_class: io.netty.handler.codec.MessageToMessageEncoder
{
  private static final io.netty.buffer.ByteBuf _0X00;
    descriptor: Lio/netty/buffer/ByteBuf;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final io.netty.buffer.ByteBuf _0XFF;
    descriptor: Lio/netty/buffer/ByteBuf;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final io.netty.buffer.ByteBuf _0XFF_0X00;
    descriptor: Lio/netty/buffer/ByteBuf;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 35
            iconst_1
            iconst_1
            invokestatic io.netty.buffer.Unpooled.directBuffer:(II)Lio/netty/buffer/ByteBuf;
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
         1: .line 34
            invokestatic io.netty.buffer.Unpooled.unreleasableBuffer:(Lio/netty/buffer/ByteBuf;)Lio/netty/buffer/ByteBuf;
            putstatic io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder._0X00:Lio/netty/buffer/ByteBuf;
         2: .line 37
            iconst_1
            iconst_1
            invokestatic io.netty.buffer.Unpooled.directBuffer:(II)Lio/netty/buffer/ByteBuf;
            iconst_m1
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
         3: .line 36
            invokestatic io.netty.buffer.Unpooled.unreleasableBuffer:(Lio/netty/buffer/ByteBuf;)Lio/netty/buffer/ByteBuf;
            putstatic io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder._0XFF:Lio/netty/buffer/ByteBuf;
         4: .line 39
            iconst_2
            iconst_2
            invokestatic io.netty.buffer.Unpooled.directBuffer:(II)Lio/netty/buffer/ByteBuf;
            iconst_m1
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
         5: .line 38
            invokestatic io.netty.buffer.Unpooled.unreleasableBuffer:(Lio/netty/buffer/ByteBuf;)Lio/netty/buffer/ByteBuf;
            putstatic io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder._0XFF_0X00:Lio/netty/buffer/ByteBuf;
         6: .line 39
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder this
         0: .line 33
            aload 0 /* this */
            invokespecial io.netty.handler.codec.MessageToMessageEncoder.<init>:()V
            return
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameEncoder;

  protected void encode(io.netty.channel.ChannelHandlerContext, io.netty.handler.codec.http.websocketx.WebSocketFrame, java.util.List<java.lang.Object>);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/websocketx/WebSocketFrame;Ljava/util/List;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=13, args_size=4
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.handler.codec.http.websocketx.WebSocketFrame msg
        start local 3 // java.util.List out
         0: .line 43
            aload 2 /* msg */
            instanceof io.netty.handler.codec.http.websocketx.TextWebSocketFrame
            ifeq 6
         1: .line 45
            aload 2 /* msg */
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocketFrame.content:()Lio/netty/buffer/ByteBuf;
            astore 4 /* data */
        start local 4 // io.netty.buffer.ByteBuf data
         2: .line 47
            aload 3 /* out */
            getstatic io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder._0X00:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.duplicate:()Lio/netty/buffer/ByteBuf;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         3: .line 48
            aload 3 /* out */
            aload 4 /* data */
            invokevirtual io.netty.buffer.ByteBuf.retain:()Lio/netty/buffer/ByteBuf;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         4: .line 49
            aload 3 /* out */
            getstatic io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder._0XFF:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.duplicate:()Lio/netty/buffer/ByteBuf;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        end local 4 // io.netty.buffer.ByteBuf data
         5: .line 50
            goto 44
      StackMap locals:
      StackMap stack:
         6: aload 2 /* msg */
            instanceof io.netty.handler.codec.http.websocketx.CloseWebSocketFrame
            ifeq 9
         7: .line 53
            aload 3 /* out */
            getstatic io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder._0XFF_0X00:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.duplicate:()Lio/netty/buffer/ByteBuf;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         8: .line 54
            goto 44
         9: .line 56
      StackMap locals:
      StackMap stack:
            aload 2 /* msg */
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocketFrame.content:()Lio/netty/buffer/ByteBuf;
            astore 4 /* data */
        start local 4 // io.netty.buffer.ByteBuf data
        10: .line 57
            aload 4 /* data */
            invokevirtual io.netty.buffer.ByteBuf.readableBytes:()I
            istore 5 /* dataLen */
        start local 5 // int dataLen
        11: .line 59
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.alloc:()Lio/netty/buffer/ByteBufAllocator;
            iconst_5
            invokeinterface io.netty.buffer.ByteBufAllocator.buffer:(I)Lio/netty/buffer/ByteBuf;
            astore 6 /* buf */
        start local 6 // io.netty.buffer.ByteBuf buf
        12: .line 60
            iconst_1
            istore 7 /* release */
        start local 7 // boolean release
        13: .line 63
            aload 6 /* buf */
            bipush -128
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        14: .line 66
            iload 5 /* dataLen */
            bipush 28
            iushr
            bipush 127
            iand
            istore 8 /* b1 */
        start local 8 // int b1
        15: .line 67
            iload 5 /* dataLen */
            bipush 14
            iushr
            bipush 127
            iand
            istore 9 /* b2 */
        start local 9 // int b2
        16: .line 68
            iload 5 /* dataLen */
            bipush 7
            iushr
            bipush 127
            iand
            istore 10 /* b3 */
        start local 10 // int b3
        17: .line 69
            iload 5 /* dataLen */
            bipush 127
            iand
            istore 11 /* b4 */
        start local 11 // int b4
        18: .line 70
            iload 8 /* b1 */
            ifne 30
        19: .line 71
            iload 9 /* b2 */
            ifne 26
        20: .line 72
            iload 10 /* b3 */
            ifne 23
        21: .line 73
            aload 6 /* buf */
            iload 11 /* b4 */
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        22: .line 74
            goto 34
        23: .line 75
      StackMap locals: io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder io.netty.channel.ChannelHandlerContext io.netty.handler.codec.http.websocketx.WebSocketFrame java.util.List io.netty.buffer.ByteBuf int io.netty.buffer.ByteBuf int int int int int
      StackMap stack:
            aload 6 /* buf */
            iload 10 /* b3 */
            sipush 128
            ior
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        24: .line 76
            aload 6 /* buf */
            iload 11 /* b4 */
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        25: .line 78
            goto 34
        26: .line 79
      StackMap locals:
      StackMap stack:
            aload 6 /* buf */
            iload 9 /* b2 */
            sipush 128
            ior
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        27: .line 80
            aload 6 /* buf */
            iload 10 /* b3 */
            sipush 128
            ior
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        28: .line 81
            aload 6 /* buf */
            iload 11 /* b4 */
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        29: .line 83
            goto 34
        30: .line 84
      StackMap locals:
      StackMap stack:
            aload 6 /* buf */
            iload 8 /* b1 */
            sipush 128
            ior
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        31: .line 85
            aload 6 /* buf */
            iload 9 /* b2 */
            sipush 128
            ior
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        32: .line 86
            aload 6 /* buf */
            iload 10 /* b3 */
            sipush 128
            ior
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        33: .line 87
            aload 6 /* buf */
            iload 11 /* b4 */
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
        34: .line 91
      StackMap locals:
      StackMap stack:
            aload 3 /* out */
            aload 6 /* buf */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        35: .line 92
            aload 3 /* out */
            aload 4 /* data */
            invokevirtual io.netty.buffer.ByteBuf.retain:()Lio/netty/buffer/ByteBuf;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        36: .line 93
            iconst_0
            istore 7 /* release */
        end local 11 // int b4
        end local 10 // int b3
        end local 9 // int b2
        end local 8 // int b1
        37: .line 94
            goto 42
      StackMap locals: io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder io.netty.channel.ChannelHandlerContext io.netty.handler.codec.http.websocketx.WebSocketFrame java.util.List io.netty.buffer.ByteBuf int io.netty.buffer.ByteBuf int
      StackMap stack: java.lang.Throwable
        38: astore 12
        39: .line 95
            iload 7 /* release */
            ifeq 41
        40: .line 96
            aload 6 /* buf */
            invokevirtual io.netty.buffer.ByteBuf.release:()Z
            pop
        41: .line 98
      StackMap locals: io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder io.netty.channel.ChannelHandlerContext io.netty.handler.codec.http.websocketx.WebSocketFrame java.util.List io.netty.buffer.ByteBuf int io.netty.buffer.ByteBuf int top top top top java.lang.Throwable
      StackMap stack:
            aload 12
            athrow
        42: .line 95
      StackMap locals: io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder io.netty.channel.ChannelHandlerContext io.netty.handler.codec.http.websocketx.WebSocketFrame java.util.List io.netty.buffer.ByteBuf int io.netty.buffer.ByteBuf int
      StackMap stack:
            iload 7 /* release */
            ifeq 44
        43: .line 96
            aload 6 /* buf */
            invokevirtual io.netty.buffer.ByteBuf.release:()Z
            pop
        end local 7 // boolean release
        end local 6 // io.netty.buffer.ByteBuf buf
        end local 5 // int dataLen
        end local 4 // io.netty.buffer.ByteBuf data
        44: .line 100
      StackMap locals: io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder io.netty.channel.ChannelHandlerContext io.netty.handler.codec.http.websocketx.WebSocketFrame java.util.List
      StackMap stack:
            return
        end local 3 // java.util.List out
        end local 2 // io.netty.handler.codec.http.websocketx.WebSocketFrame msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   45     0     this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameEncoder;
            0   45     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0   45     2      msg  Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
            0   45     3      out  Ljava/util/List<Ljava/lang/Object;>;
            2    5     4     data  Lio/netty/buffer/ByteBuf;
           10   44     4     data  Lio/netty/buffer/ByteBuf;
           11   44     5  dataLen  I
           12   44     6      buf  Lio/netty/buffer/ByteBuf;
           13   44     7  release  Z
           15   37     8       b1  I
           16   37     9       b2  I
           17   37    10       b3  I
           18   37    11       b4  I
      Exception table:
        from    to  target  type
          13    38      38  any
    Exceptions:
      throws java.lang.Exception
    Signature: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/websocketx/WebSocketFrame;Ljava/util/List<Ljava/lang/Object;>;)V
    MethodParameters:
      Name  Flags
      ctx   
      msg   
      out   

  protected void encode(io.netty.channel.ChannelHandlerContext, java.lang.Object, java.util.List);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;Ljava/util/List;)V
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=4, locals=4, args_size=4
         0: .line 1
            aload 0
            aload 1
            aload 2
            checkcast io.netty.handler.codec.http.websocketx.WebSocketFrame
            aload 3
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder.encode:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/handler/codec/http/websocketx/WebSocketFrame;Ljava/util/List;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.lang.Exception
}
Signature: Lio/netty/handler/codec/MessageToMessageEncoder<Lio/netty/handler/codec/http/websocketx/WebSocketFrame;>;Lio/netty/handler/codec/http/websocketx/WebSocketFrameEncoder;
SourceFile: "WebSocket00FrameEncoder.java"
InnerClasses:
  public abstract Sharable = io.netty.channel.ChannelHandler$Sharable of io.netty.channel.ChannelHandler
    RuntimeVisibleAnnotations: 
      io.netty.channel.ChannelHandler$Sharable()