Motivation: Currently we do more memory copies then needed. Modification: - Directly use heap buffers to reduce memory copy - Correctly release buffers to fix buffer leak Result: Less memory copies and no leaks
115 lines
3.6 KiB
Java
115 lines
3.6 KiB
Java
/*
|
|
* 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:
|
|
*
|
|
* 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 io.netty.buffer.ByteBuf;
|
|
import io.netty.buffer.ByteBufAllocator;
|
|
import io.netty.buffer.Unpooled;
|
|
|
|
import java.util.zip.Deflater;
|
|
|
|
import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;
|
|
|
|
class SpdyHeaderBlockZlibEncoder extends SpdyHeaderBlockRawEncoder {
|
|
|
|
private final Deflater compressor;
|
|
|
|
private boolean finished;
|
|
|
|
SpdyHeaderBlockZlibEncoder(SpdyVersion spdyVersion, int compressionLevel) {
|
|
super(spdyVersion);
|
|
if (compressionLevel < 0 || compressionLevel > 9) {
|
|
throw new IllegalArgumentException(
|
|
"compressionLevel: " + compressionLevel + " (expected: 0-9)");
|
|
}
|
|
compressor = new Deflater(compressionLevel);
|
|
compressor.setDictionary(SPDY_DICT);
|
|
}
|
|
|
|
private int setInput(ByteBuf decompressed) {
|
|
int len = decompressed.readableBytes();
|
|
|
|
if (decompressed.hasArray()) {
|
|
compressor.setInput(decompressed.array(), decompressed.arrayOffset() + decompressed.readerIndex(), len);
|
|
} else {
|
|
byte[] in = new byte[len];
|
|
decompressed.getBytes(decompressed.readerIndex(), in);
|
|
compressor.setInput(in, 0, in.length);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
private ByteBuf encode(ByteBufAllocator alloc, int len) {
|
|
ByteBuf compressed = alloc.heapBuffer(len);
|
|
boolean release = true;
|
|
try {
|
|
while (compressInto(compressed)) {
|
|
// Although unlikely, it's possible that the compressed size is larger than the decompressed size
|
|
compressed.ensureWritable(compressed.capacity() << 1);
|
|
}
|
|
release = false;
|
|
return compressed;
|
|
} finally {
|
|
if (release) {
|
|
compressed.release();
|
|
}
|
|
}
|
|
}
|
|
|
|
private boolean compressInto(ByteBuf compressed) {
|
|
byte[] out = compressed.array();
|
|
int off = compressed.arrayOffset() + compressed.writerIndex();
|
|
int toWrite = compressed.writableBytes();
|
|
int numBytes = compressor.deflate(out, off, toWrite, Deflater.SYNC_FLUSH);
|
|
compressed.writerIndex(compressed.writerIndex() + numBytes);
|
|
return numBytes == toWrite;
|
|
}
|
|
|
|
@Override
|
|
public ByteBuf encode(ByteBufAllocator alloc, SpdyHeadersFrame frame) throws Exception {
|
|
if (frame == null) {
|
|
throw new IllegalArgumentException("frame");
|
|
}
|
|
|
|
if (finished) {
|
|
return Unpooled.EMPTY_BUFFER;
|
|
}
|
|
|
|
ByteBuf decompressed = super.encode(alloc, frame);
|
|
try {
|
|
if (!decompressed.isReadable()) {
|
|
return Unpooled.EMPTY_BUFFER;
|
|
}
|
|
|
|
int len = setInput(decompressed);
|
|
return encode(alloc, len);
|
|
} finally {
|
|
decompressed.release();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void end() {
|
|
if (finished) {
|
|
return;
|
|
}
|
|
finished = true;
|
|
compressor.end();
|
|
super.end();
|
|
}
|
|
}
|