1 /*

     2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package java.net.http.internal.frame;

    27 

    28 import java.net.http.internal.common.Utils;

    29 

    30 import java.nio.ByteBuffer;

    31 import java.util.List;

    32 

    33 public class DataFrame extends Http2Frame {

    34 

    35     public static final int TYPE = 0x0;

    36 

    37     // Flags

    38     public static final int END_STREAM = 0x1;

    39     public static final int PADDED = 0x8;

    40 

    41     private int padLength;

    42     private final List<ByteBuffer> data;

    43     private final int dataLength;

    44 

    45     public DataFrame(int streamid, int flags, ByteBuffer data) {

    46         this(streamid, flags, List.of(data));

    47     }

    48 

    49     public DataFrame(int streamid, int flags, List<ByteBuffer> data) {

    50         super(streamid, flags);

    51         this.data = data;

    52         this.dataLength = Utils.remaining(data, Integer.MAX_VALUE);

    53     }

    54 

    55     public DataFrame(int streamid, int flags, List<ByteBuffer> data, int padLength) {

    56         this(streamid, flags, data);

    57         if (padLength > 0) {

    58             setPadLength(padLength);

    59         }

    60     }

    61 

    62     @Override

    63     public int type() {

    64         return TYPE;

    65     }

    66 

    67     @Override

    68     int length() {

    69         return dataLength + (((flags & PADDED) != 0) ? (padLength + 1) : 0);

    70     }

    71 

    72     @Override

    73     public String flagAsString(int flag) {

    74         switch (flag) {

    75         case END_STREAM:

    76             return "END_STREAM";

    77         case PADDED:

    78             return "PADDED";

    79         }

    80         return super.flagAsString(flag);

    81     }

    82 

    83     public List<ByteBuffer> getData() {

    84         return data;

    85     }

    86 

    87     public int getDataLength() {

    88         return dataLength;

    89     }

    90 

    91     int getPadLength() {

    92         return padLength;

    93     }

    94 

    95     public void setPadLength(int padLength) {

    96         this.padLength = padLength;

    97         flags |= PADDED;

    98     }

    99 

   100     public int payloadLength() {

   101         // RFC 7540 6.1:

   102         // The entire DATA frame payload is included in flow control,

   103         // including the Pad Length and Padding fields if present

   104         if ((flags & PADDED) != 0) {

   105             return dataLength + (1 + padLength);

   106         } else {

   107             return dataLength;

   108         }

   109     }

   110 

   111 

   112 }