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/*
 * 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:
 *
 * 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 io.netty.handler.codec.http2;

import io.netty.buffer.ByteBuf;
import io.netty.util.internal.UnstableApi;

/**
 * Decodes HPACK-encoded headers blocks into {@link Http2Headers}.
 */
@UnstableApi
public interface Http2HeadersDecoder {
    /**
     * Configuration related elements for the {@link Http2HeadersDecoder} interface
     */
    interface Configuration {
        /**
         * Represents the value for
         * SETTINGS_HEADER_TABLE_SIZE.
         * This method should only be called by Netty (not users) as a result of a receiving a {@code SETTINGS} frame.
         */
        void maxHeaderTableSize(long max) throws Http2Exception;

        /**
         * Represents the value for
         * SETTINGS_HEADER_TABLE_SIZE. The initial value
         * returned by this method must be {@link Http2CodecUtil#DEFAULT_HEADER_TABLE_SIZE}.
         */
        long maxHeaderTableSize();

        /**
         * Configure the maximum allowed size in bytes of each set of headers.
         * 

* This method should only be called by Netty (not users) as a result of a receiving a {@code SETTINGS} frame. * @param max SETTINGS_MAX_HEADER_LIST_SIZE. * If this limit is exceeded the implementation should attempt to keep the HPACK header tables up to date * by processing data from the peer, but a {@code RST_STREAM} frame will be sent for the offending stream. * @param goAwayMax Must be {@code >= max}. A {@code GO_AWAY} frame will be generated if this limit is exceeded * for any particular stream. * @throws Http2Exception if limits exceed the RFC's boundaries or {@code max > goAwayMax}. */ void maxHeaderListSize(long max, long goAwayMax) throws Http2Exception; /** * Represents the value for * SETTINGS_MAX_HEADER_LIST_SIZE. */ long maxHeaderListSize(); /** * Represents the upper bound in bytes for a set of headers before a {@code GO_AWAY} should be sent. * This will be {@code <=} * SETTINGS_MAX_HEADER_LIST_SIZE. */ long maxHeaderListSizeGoAway(); } /** * Decodes the given headers block and returns the headers. */ Http2Headers decodeHeaders(int streamId, ByteBuf headerBlock) throws Http2Exception; /** * Get the {@link Configuration} for this {@link Http2HeadersDecoder} */ Configuration configuration(); }





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