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.WebSocket00FrameDecoder extends io.netty.handler.codec.ReplayingDecoder<java.lang.Void> implements io.netty.handler.codec.http.websocketx.WebSocketFrameDecoder
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder
  super_class: io.netty.handler.codec.ReplayingDecoder
{
  static final int DEFAULT_MAX_FRAME_SIZE;
    descriptor: I
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: 16384

  private final long maxFrameSize;
    descriptor: J
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private boolean receivedClosingHandshake;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
         0: .line 41
            aload 0 /* this */
            sipush 16384
            invokespecial io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.<init>:(I)V
         1: .line 42
            return
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameDecoder;

  public void <init>(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
        start local 1 // int maxFrameSize
         0: .line 51
            aload 0 /* this */
            invokespecial io.netty.handler.codec.ReplayingDecoder.<init>:()V
         1: .line 52
            aload 0 /* this */
            iload 1 /* maxFrameSize */
            i2l
            putfield io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.maxFrameSize:J
         2: .line 53
            return
        end local 1 // int maxFrameSize
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    3     0          this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameDecoder;
            0    3     1  maxFrameSize  I
    MethodParameters:
              Name  Flags
      maxFrameSize  

  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=4, locals=6, args_size=4
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder 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 58
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.receivedClosingHandshake:Z
            ifeq 3
         1: .line 59
            aload 2 /* in */
            aload 0 /* this */
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.actualReadableBytes:()I
            invokevirtual io.netty.buffer.ByteBuf.skipBytes:(I)Lio/netty/buffer/ByteBuf;
            pop
         2: .line 60
            return
         3: .line 64
      StackMap locals:
      StackMap stack:
            aload 2 /* in */
            invokevirtual io.netty.buffer.ByteBuf.readByte:()B
            istore 4 /* type */
        start local 4 // byte type
         4: .line 66
            iload 4 /* type */
            sipush 128
            iand
            sipush 128
            if_icmpne 7
         5: .line 68
            aload 0 /* this */
            aload 1 /* ctx */
            iload 4 /* type */
            aload 2 /* in */
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.decodeBinaryFrame:(Lio/netty/channel/ChannelHandlerContext;BLio/netty/buffer/ByteBuf;)Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
            astore 5 /* frame */
        start local 5 // io.netty.handler.codec.http.websocketx.WebSocketFrame frame
         6: .line 69
            goto 8
        end local 5 // io.netty.handler.codec.http.websocketx.WebSocketFrame frame
         7: .line 71
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* ctx */
            aload 2 /* in */
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.decodeTextFrame:(Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;)Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
            astore 5 /* frame */
        start local 5 // io.netty.handler.codec.http.websocketx.WebSocketFrame frame
         8: .line 74
      StackMap locals: io.netty.handler.codec.http.websocketx.WebSocketFrame
      StackMap stack:
            aload 5 /* frame */
            ifnull 10
         9: .line 75
            aload 3 /* out */
            aload 5 /* frame */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        10: .line 77
      StackMap locals:
      StackMap stack:
            return
        end local 5 // io.netty.handler.codec.http.websocketx.WebSocketFrame frame
        end local 4 // byte type
        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.http.websocketx.WebSocket00FrameDecoder this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   11     0   this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameDecoder;
            0   11     1    ctx  Lio/netty/channel/ChannelHandlerContext;
            0   11     2     in  Lio/netty/buffer/ByteBuf;
            0   11     3    out  Ljava/util/List<Ljava/lang/Object;>;
            4   11     4   type  B
            6    7     5  frame  Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
            8   11     5  frame  Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
    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 io.netty.handler.codec.http.websocketx.WebSocketFrame decodeBinaryFrame(io.netty.channel.ChannelHandlerContext, byte, io.netty.buffer.ByteBuf);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;BLio/netty/buffer/ByteBuf;)Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=9, args_size=4
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // byte type
        start local 3 // io.netty.buffer.ByteBuf buffer
         0: .line 80
            lconst_0
            lstore 4 /* frameSize */
        start local 4 // long frameSize
         1: .line 81
            iconst_0
            istore 6 /* lengthFieldSize */
        start local 6 // int lengthFieldSize
         2: .line 84
      StackMap locals: long int
      StackMap stack:
            aload 3 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readByte:()B
            istore 7 /* b */
        start local 7 // byte b
         3: .line 85
            lload 4 /* frameSize */
            bipush 7
            lshl
            lstore 4 /* frameSize */
         4: .line 86
            lload 4 /* frameSize */
            iload 7 /* b */
            bipush 127
            iand
            i2l
            lor
            lstore 4 /* frameSize */
         5: .line 87
            lload 4 /* frameSize */
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.maxFrameSize:J
            lcmp
            ifle 7
         6: .line 88
            new io.netty.handler.codec.TooLongFrameException
            dup
            invokespecial io.netty.handler.codec.TooLongFrameException.<init>:()V
            athrow
         7: .line 90
      StackMap locals: int
      StackMap stack:
            iinc 6 /* lengthFieldSize */ 1
         8: .line 91
            iload 6 /* lengthFieldSize */
            bipush 8
            if_icmple 10
         9: .line 93
            new io.netty.handler.codec.TooLongFrameException
            dup
            invokespecial io.netty.handler.codec.TooLongFrameException.<init>:()V
            athrow
        10: .line 95
      StackMap locals:
      StackMap stack:
            iload 7 /* b */
            sipush 128
            iand
            sipush 128
            if_icmpeq 2
        11: .line 97
            iload 2 /* type */
            iconst_m1
            if_icmpne 14
            lload 4 /* frameSize */
            lconst_0
            lcmp
            ifne 14
        12: .line 98
            aload 0 /* this */
            iconst_1
            putfield io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.receivedClosingHandshake:Z
        13: .line 99
            new io.netty.handler.codec.http.websocketx.CloseWebSocketFrame
            dup
            invokespecial io.netty.handler.codec.http.websocketx.CloseWebSocketFrame.<init>:()V
            areturn
        14: .line 101
      StackMap locals:
      StackMap stack:
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.alloc:()Lio/netty/buffer/ByteBufAllocator;
            aload 3 /* buffer */
            lload 4 /* frameSize */
            l2i
            invokestatic io.netty.buffer.ByteBufUtil.readBytes:(Lio/netty/buffer/ByteBufAllocator;Lio/netty/buffer/ByteBuf;I)Lio/netty/buffer/ByteBuf;
            astore 8 /* payload */
        start local 8 // io.netty.buffer.ByteBuf payload
        15: .line 102
            new io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame
            dup
            aload 8 /* payload */
            invokespecial io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame.<init>:(Lio/netty/buffer/ByteBuf;)V
            areturn
        end local 8 // io.netty.buffer.ByteBuf payload
        end local 7 // byte b
        end local 6 // int lengthFieldSize
        end local 4 // long frameSize
        end local 3 // io.netty.buffer.ByteBuf buffer
        end local 2 // byte type
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0   16     0             this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameDecoder;
            0   16     1              ctx  Lio/netty/channel/ChannelHandlerContext;
            0   16     2             type  B
            0   16     3           buffer  Lio/netty/buffer/ByteBuf;
            1   16     4        frameSize  J
            2   16     6  lengthFieldSize  I
            3   16     7                b  B
           15   16     8          payload  Lio/netty/buffer/ByteBuf;
    MethodParameters:
        Name  Flags
      ctx     
      type    
      buffer  

  private io.netty.handler.codec.http.websocketx.WebSocketFrame decodeTextFrame(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Lio/netty/buffer/ByteBuf;)Lio/netty/handler/codec/http/websocketx/WebSocketFrame;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=9, args_size=3
        start local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // io.netty.buffer.ByteBuf buffer
         0: .line 106
            aload 2 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.readerIndex:()I
            istore 3 /* ridx */
        start local 3 // int ridx
         1: .line 107
            aload 0 /* this */
            invokevirtual io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.actualReadableBytes:()I
            istore 4 /* rbytes */
        start local 4 // int rbytes
         2: .line 108
            aload 2 /* buffer */
            iload 3 /* ridx */
            iload 3 /* ridx */
            iload 4 /* rbytes */
            iadd
            iconst_m1
            invokevirtual io.netty.buffer.ByteBuf.indexOf:(IIB)I
            istore 5 /* delimPos */
        start local 5 // int delimPos
         3: .line 109
            iload 5 /* delimPos */
            iconst_m1
            if_icmpne 7
         4: .line 111
            iload 4 /* rbytes */
            i2l
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.maxFrameSize:J
            lcmp
            ifle 6
         5: .line 113
            new io.netty.handler.codec.TooLongFrameException
            dup
            invokespecial io.netty.handler.codec.TooLongFrameException.<init>:()V
            athrow
         6: .line 116
      StackMap locals: int int int
      StackMap stack:
            aconst_null
            areturn
         7: .line 120
      StackMap locals:
      StackMap stack:
            iload 5 /* delimPos */
            iload 3 /* ridx */
            isub
            istore 6 /* frameSize */
        start local 6 // int frameSize
         8: .line 121
            iload 6 /* frameSize */
            i2l
            aload 0 /* this */
            getfield io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder.maxFrameSize:J
            lcmp
            ifle 10
         9: .line 122
            new io.netty.handler.codec.TooLongFrameException
            dup
            invokespecial io.netty.handler.codec.TooLongFrameException.<init>:()V
            athrow
        10: .line 125
      StackMap locals: int
      StackMap stack:
            aload 1 /* ctx */
            invokeinterface io.netty.channel.ChannelHandlerContext.alloc:()Lio/netty/buffer/ByteBufAllocator;
            aload 2 /* buffer */
            iload 6 /* frameSize */
            invokestatic io.netty.buffer.ByteBufUtil.readBytes:(Lio/netty/buffer/ByteBufAllocator;Lio/netty/buffer/ByteBuf;I)Lio/netty/buffer/ByteBuf;
            astore 7 /* binaryData */
        start local 7 // io.netty.buffer.ByteBuf binaryData
        11: .line 126
            aload 2 /* buffer */
            iconst_1
            invokevirtual io.netty.buffer.ByteBuf.skipBytes:(I)Lio/netty/buffer/ByteBuf;
            pop
        12: .line 128
            aload 7 /* binaryData */
            aload 7 /* binaryData */
            invokevirtual io.netty.buffer.ByteBuf.readerIndex:()I
            aload 7 /* binaryData */
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:()I
            iconst_m1
            invokevirtual io.netty.buffer.ByteBuf.indexOf:(IIB)I
            istore 8 /* ffDelimPos */
        start local 8 // int ffDelimPos
        13: .line 129
            iload 8 /* ffDelimPos */
            iflt 16
        14: .line 130
            aload 7 /* binaryData */
            invokevirtual io.netty.buffer.ByteBuf.release:()Z
            pop
        15: .line 131
            new java.lang.IllegalArgumentException
            dup
            ldc "a text frame should not contain 0xFF."
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        16: .line 134
      StackMap locals: io.netty.buffer.ByteBuf int
      StackMap stack:
            new io.netty.handler.codec.http.websocketx.TextWebSocketFrame
            dup
            aload 7 /* binaryData */
            invokespecial io.netty.handler.codec.http.websocketx.TextWebSocketFrame.<init>:(Lio/netty/buffer/ByteBuf;)V
            areturn
        end local 8 // int ffDelimPos
        end local 7 // io.netty.buffer.ByteBuf binaryData
        end local 6 // int frameSize
        end local 5 // int delimPos
        end local 4 // int rbytes
        end local 3 // int ridx
        end local 2 // io.netty.buffer.ByteBuf buffer
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   17     0        this  Lio/netty/handler/codec/http/websocketx/WebSocket00FrameDecoder;
            0   17     1         ctx  Lio/netty/channel/ChannelHandlerContext;
            0   17     2      buffer  Lio/netty/buffer/ByteBuf;
            1   17     3        ridx  I
            2   17     4      rbytes  I
            3   17     5    delimPos  I
            8   17     6   frameSize  I
           11   17     7  binaryData  Lio/netty/buffer/ByteBuf;
           13   17     8  ffDelimPos  I
    MethodParameters:
        Name  Flags
      ctx     
      buffer  
}
Signature: Lio/netty/handler/codec/ReplayingDecoder<Ljava/lang/Void;>;Lio/netty/handler/codec/http/websocketx/WebSocketFrameDecoder;
SourceFile: "WebSocket00FrameDecoder.java"