SpdyHeaderBlockZlibDecoder.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 java.util.zip.DataFormatException;
import java.util.zip.Inflater;

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

final class SpdyHeaderBlockZlibDecoder extends SpdyHeaderBlockRawDecoder {

    private static final int DEFAULT_BUFFER_CAPACITY = 4096;
    private static final SpdyProtocolException INVALID_HEADER_BLOCK =
            new SpdyProtocolException("Invalid Header Block");

    private final Inflater decompressor = new Inflater();

    private ByteBuf decompressed;

    SpdyHeaderBlockZlibDecoder(SpdyVersion spdyVersion, int maxHeaderSize) {
        super(spdyVersion, maxHeaderSize);
    }

    @Override
    void decode(ByteBufAllocator alloc, ByteBuf headerBlock, SpdyHeadersFrame frame) throws Exception {
        int len = setInput(headerBlock);

        int numBytes;
        do {
            numBytes = decompress(alloc, frame);
        } while (numBytes > 0);

        // z_stream has an internal 64-bit hold buffer
        // it is always capable of consuming the entire input
        if (decompressor.getRemaining() != 0) {
            // we reached the end of the deflate stream
            throw INVALID_HEADER_BLOCK;
        }

        headerBlock.skipBytes(len);
    }

    private int setInput(ByteBuf compressed) {
        int len = compressed.readableBytes();
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