io.netty.handler.codec.spdy.SpdyHeaderBlockZlibDecompressor Maven / Gradle / Ivy
/*
* Copyright 2012 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.spdy;
import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;
import io.netty.buffer.ByteBuf;
import java.util.zip.DataFormatException;
import java.util.zip.Inflater;
class SpdyHeaderBlockZlibDecompressor extends SpdyHeaderBlockDecompressor {
private final int version;
private final byte[] out = new byte[8192];
private final Inflater decompressor = new Inflater();
public SpdyHeaderBlockZlibDecompressor(int version) {
if (version < SpdyConstants.SPDY_MIN_VERSION || version > SpdyConstants.SPDY_MAX_VERSION) {
throw new IllegalArgumentException(
"unsupported version: " + version);
}
this.version = version;
}
@Override
public void setInput(ByteBuf compressed) {
byte[] in = new byte[compressed.readableBytes()];
compressed.readBytes(in);
decompressor.setInput(in);
}
@Override
public int decode(ByteBuf decompressed) throws Exception {
try {
int numBytes = decompressor.inflate(out);
if (numBytes == 0 && decompressor.needsDictionary()) {
if (version < 3) {
decompressor.setDictionary(SPDY2_DICT);
} else {
decompressor.setDictionary(SPDY_DICT);
}
numBytes = decompressor.inflate(out);
}
decompressed.writeBytes(out, 0, numBytes);
return numBytes;
} catch (DataFormatException e) {
throw new SpdyProtocolException(
"Received invalid header block", e);
}
}
@Override
public void end() {
decompressor.end();
}
}