Http2CodecUtil.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.http2;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.DefaultChannelPromise;
import io.netty.handler.ssl.ApplicationProtocolNames;
import io.netty.util.AsciiString;
import io.netty.util.LeakPresenceDetector;
import io.netty.util.concurrent.EventExecutor;

import static io.netty.buffer.Unpooled.directBuffer;
import static io.netty.buffer.Unpooled.unreleasableBuffer;
import static io.netty.handler.codec.http2.Http2Error.PROTOCOL_ERROR;
import static io.netty.handler.codec.http2.Http2Exception.connectionError;
import static io.netty.handler.codec.http2.Http2Exception.headerListSizeError;
import static io.netty.util.CharsetUtil.UTF_8;
import static java.lang.Math.max;
import static java.lang.Math.min;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;

/**
 * Constants and utility method used for encoding/decoding HTTP2 frames.
 */
public final class Http2CodecUtil {
    public static final int CONNECTION_STREAM_ID = 0;
    public static final int HTTP_UPGRADE_STREAM_ID = 1;
    public static final CharSequence HTTP_UPGRADE_SETTINGS_HEADER = AsciiString.cached("HTTP2-Settings");
    public static final CharSequence HTTP_UPGRADE_PROTOCOL_NAME = "h2c";
    public static final CharSequence TLS_UPGRADE_PROTOCOL_NAME = ApplicationProtocolNames.HTTP_2;

    public static final int PING_FRAME_PAYLOAD_LENGTH = 8;
    public static final short MAX_UNSIGNED_BYTE = 0xff;
    /**
     * The maximum number of padding bytes. That is the 255 padding bytes appended to the end of a frame and the 1 byte
     * pad length field.
     */
    public static final int MAX_PADDING = 256;
    public static final long MAX_UNSIGNED_INT = 0xffffffffL;
    public static final int FRAME_HEADER_LENGTH = 9;
    public static final int SETTING_ENTRY_LENGTH = 6;
// ... (345 more lines)