io.netty.handler.codec.spdy.SpdyHeaderBlockRawEncoder Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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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:
 *
 *   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.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.util.internal.ObjectUtil;

import java.util.Set;

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

public class SpdyHeaderBlockRawEncoder extends SpdyHeaderBlockEncoder {

    private final int version;

    public SpdyHeaderBlockRawEncoder(SpdyVersion version) {
        this.version = ObjectUtil.checkNotNull(version, "version").getVersion();
    }

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

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

    @Override
    public ByteBuf encode(ByteBufAllocator alloc, SpdyHeadersFrame frame) throws Exception {
        Set names = frame.headers().names();
        int numHeaders = names.size();
        if (numHeaders == 0) {
            return Unpooled.EMPTY_BUFFER;
        }
        if (numHeaders > SPDY_MAX_NV_LENGTH) {
            throw new IllegalArgumentException(
                    "header block contains too many headers");
        }
        ByteBuf headerBlock = alloc.heapBuffer();
        writeLengthField(headerBlock, numHeaders);
        for (CharSequence name: names) {
            writeLengthField(headerBlock, name.length());
            ByteBufUtil.writeAscii(headerBlock, name);
            int savedIndex = headerBlock.writerIndex();
            int valueLength = 0;
            writeLengthField(headerBlock, valueLength);
            for (CharSequence value: frame.headers().getAll(name)) {
                int length = value.length();
                if (length > 0) {
                    ByteBufUtil.writeAscii(headerBlock, value);
                    headerBlock.writeByte(0);
                    valueLength += 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() {
    }
}