SpdyFrameEncoder.java — netty Source File

Source Code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.handler.codec.spdy;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.util.internal.ObjectUtil;

import java.nio.ByteOrder;
import java.util.Set;

import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;

/**
 * Encodes a SPDY Frame into a {@link ByteBuf}.
 */
public class SpdyFrameEncoder {

    private final int version;

    /**
     * Creates a new instance with the specified {@code spdyVersion}.
     */
    public SpdyFrameEncoder(SpdyVersion spdyVersion) {
        version = ObjectUtil.checkNotNull(spdyVersion, "spdyVersion").version();
    }

    protected void writeControlFrameHeader(ByteBuf buffer, int type, byte flags, int length) {
        buffer.writeShort(version | 0x8000);
        buffer.writeShort(type);
        buffer.writeByte(flags);
        buffer.writeMedium(length);
    }

    public ByteBuf encodeDataFrame(ByteBufAllocator allocator, int streamId, boolean last, ByteBuf data) {
        byte flags = last ? SPDY_DATA_FLAG_FIN : 0;
        int length = data.readableBytes();
        ByteBuf frame = allocator.ioBuffer(SPDY_HEADER_SIZE + length).order(ByteOrder.BIG_ENDIAN);
        frame.writeInt(streamId & 0x7FFFFFFF);
        frame.writeByte(flags);
        frame.writeMedium(length);
        frame.writeBytes(data, data.readerIndex(), length);
        return frame;
    }

    public ByteBuf encodeSynStreamFrame(ByteBufAllocator allocator,  int streamId, int associatedToStreamId,
            byte priority, boolean last, boolean unidirectional, ByteBuf headerBlock) {
// ... (112 more lines)