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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2013 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:
 *
 *   http://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 org.jboss.netty.handler.codec.spdy;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;

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

import static org.jboss.netty.handler.codec.spdy.SpdyCodecUtil.*;

public class SpdyHeaderBlockRawEncoder extends SpdyHeaderBlockEncoder {

    private final int version;

    public SpdyHeaderBlockRawEncoder(SpdyVersion spdyVersion) {
        if (spdyVersion == null) {
            throw new NullPointerException("spdyVersion");
        }
        version = spdyVersion.getVersion();
    }

    private static void setLengthField(ChannelBuffer buffer, int writerIndex, int length) {
        buffer.setInt(writerIndex, length);
    }

    private static void writeLengthField(ChannelBuffer buffer, int length) {
        buffer.writeInt(length);
    }

    @Override
    public ChannelBuffer encode(SpdyHeadersFrame headerFrame) throws Exception {
        Set names = headerFrame.headers().names();
        int numHeaders = names.size();
        if (numHeaders == 0) {
            return ChannelBuffers.EMPTY_BUFFER;
        }
        if (numHeaders > SPDY_MAX_NV_LENGTH) {
            throw new IllegalArgumentException(
                    "header block contains too many headers");
        }
        ChannelBuffer headerBlock = ChannelBuffers.dynamicBuffer(
                ByteOrder.BIG_ENDIAN, 256);
        writeLengthField(headerBlock, numHeaders);
        for (String name: names) {
            byte[] nameBytes = name.getBytes("UTF-8");
            writeLengthField(headerBlock, nameBytes.length);
            headerBlock.writeBytes(nameBytes);
            int savedIndex = headerBlock.writerIndex();
            int valueLength = 0;
            writeLengthField(headerBlock, valueLength);
            for (String value: headerFrame.headers().getAll(name)) {
                byte[] valueBytes = value.getBytes("UTF-8");
                if (valueBytes.length > 0) {
                    headerBlock.writeBytes(valueBytes);
                    headerBlock.writeByte(0);
                    valueLength += valueBytes.length + 1;
                }
            }
            if (valueLength != 0) {
                valueLength --;
            }
            if (valueLength > SPDY_MAX_NV_LENGTH) {
                throw new IllegalArgumentException(
                        "header exceeds allowable length: " + name);
            }
            if (valueLength > 0) {
                setLengthField(headerBlock, savedIndex, valueLength);
                headerBlock.writerIndex(headerBlock.writerIndex() - 1);
            }
        }
        return headerBlock;
    }

    @Override
    void end() {
    }
}