65686b6c83
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
312 lines
11 KiB
Java
312 lines
11 KiB
Java
/*
|
|
* 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.spdy;
|
|
|
|
import io.netty.buffer.ByteBuf;
|
|
import io.netty.buffer.ByteBufAllocator;
|
|
|
|
import static io.netty.handler.codec.spdy.SpdyCodecUtil.*;
|
|
|
|
public class SpdyHeaderBlockRawDecoder extends SpdyHeaderBlockDecoder {
|
|
|
|
private static final int LENGTH_FIELD_SIZE = 4;
|
|
|
|
private final int maxHeaderSize;
|
|
|
|
private State state;
|
|
|
|
private ByteBuf cumulation;
|
|
|
|
private int headerSize;
|
|
private int numHeaders;
|
|
private int length;
|
|
private String name;
|
|
|
|
private enum State {
|
|
READ_NUM_HEADERS,
|
|
READ_NAME_LENGTH,
|
|
READ_NAME,
|
|
SKIP_NAME,
|
|
READ_VALUE_LENGTH,
|
|
READ_VALUE,
|
|
SKIP_VALUE,
|
|
END_HEADER_BLOCK,
|
|
ERROR
|
|
}
|
|
|
|
public SpdyHeaderBlockRawDecoder(SpdyVersion spdyVersion, int maxHeaderSize) {
|
|
if (spdyVersion == null) {
|
|
throw new NullPointerException("spdyVersion");
|
|
}
|
|
this.maxHeaderSize = maxHeaderSize;
|
|
state = State.READ_NUM_HEADERS;
|
|
}
|
|
|
|
private static int readLengthField(ByteBuf buffer) {
|
|
int length = getSignedInt(buffer, buffer.readerIndex());
|
|
buffer.skipBytes(LENGTH_FIELD_SIZE);
|
|
return length;
|
|
}
|
|
|
|
@Override
|
|
void decode(ByteBufAllocator alloc, ByteBuf headerBlock, SpdyHeadersFrame frame) throws Exception {
|
|
if (headerBlock == null) {
|
|
throw new NullPointerException("headerBlock");
|
|
}
|
|
if (frame == null) {
|
|
throw new NullPointerException("frame");
|
|
}
|
|
|
|
if (cumulation == null) {
|
|
decodeHeaderBlock(headerBlock, frame);
|
|
if (headerBlock.isReadable()) {
|
|
cumulation = alloc.buffer(headerBlock.readableBytes());
|
|
cumulation.writeBytes(headerBlock);
|
|
}
|
|
} else {
|
|
cumulation.writeBytes(headerBlock);
|
|
decodeHeaderBlock(cumulation, frame);
|
|
if (cumulation.isReadable()) {
|
|
cumulation.discardReadBytes();
|
|
} else {
|
|
releaseBuffer();
|
|
}
|
|
}
|
|
}
|
|
|
|
protected void decodeHeaderBlock(ByteBuf headerBlock, SpdyHeadersFrame frame) throws Exception {
|
|
int skipLength;
|
|
while (headerBlock.isReadable()) {
|
|
switch(state) {
|
|
case READ_NUM_HEADERS:
|
|
if (headerBlock.readableBytes() < LENGTH_FIELD_SIZE) {
|
|
return;
|
|
}
|
|
|
|
numHeaders = readLengthField(headerBlock);
|
|
|
|
if (numHeaders < 0) {
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
} else if (numHeaders == 0) {
|
|
state = State.END_HEADER_BLOCK;
|
|
} else {
|
|
state = State.READ_NAME_LENGTH;
|
|
}
|
|
break;
|
|
|
|
case READ_NAME_LENGTH:
|
|
if (headerBlock.readableBytes() < LENGTH_FIELD_SIZE) {
|
|
return;
|
|
}
|
|
|
|
length = readLengthField(headerBlock);
|
|
|
|
// Recipients of a zero-length name must issue a stream error
|
|
if (length <= 0) {
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
} else if (length > maxHeaderSize || headerSize > maxHeaderSize - length) {
|
|
headerSize = maxHeaderSize + 1;
|
|
state = State.SKIP_NAME;
|
|
frame.setTruncated();
|
|
} else {
|
|
headerSize += length;
|
|
state = State.READ_NAME;
|
|
}
|
|
break;
|
|
|
|
case READ_NAME:
|
|
if (headerBlock.readableBytes() < length) {
|
|
return;
|
|
}
|
|
|
|
byte[] nameBytes = new byte[length];
|
|
headerBlock.readBytes(nameBytes);
|
|
name = new String(nameBytes, "UTF-8");
|
|
|
|
// Check for identically named headers
|
|
if (frame.headers().contains(name)) {
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
} else {
|
|
state = State.READ_VALUE_LENGTH;
|
|
}
|
|
break;
|
|
|
|
case SKIP_NAME:
|
|
skipLength = Math.min(headerBlock.readableBytes(), length);
|
|
headerBlock.skipBytes(skipLength);
|
|
length -= skipLength;
|
|
|
|
if (length == 0) {
|
|
state = State.READ_VALUE_LENGTH;
|
|
}
|
|
break;
|
|
|
|
case READ_VALUE_LENGTH:
|
|
if (headerBlock.readableBytes() < LENGTH_FIELD_SIZE) {
|
|
return;
|
|
}
|
|
|
|
length = readLengthField(headerBlock);
|
|
|
|
// Recipients of illegal value fields must issue a stream error
|
|
if (length < 0) {
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
} else if (length == 0) {
|
|
if (!frame.isTruncated()) {
|
|
// SPDY/3 allows zero-length (empty) header values
|
|
frame.headers().add(name, "");
|
|
}
|
|
|
|
name = null;
|
|
if (--numHeaders == 0) {
|
|
state = State.END_HEADER_BLOCK;
|
|
} else {
|
|
state = State.READ_NAME_LENGTH;
|
|
}
|
|
|
|
} else if (length > maxHeaderSize || headerSize > maxHeaderSize - length) {
|
|
headerSize = maxHeaderSize + 1;
|
|
name = null;
|
|
state = State.SKIP_VALUE;
|
|
frame.setTruncated();
|
|
} else {
|
|
headerSize += length;
|
|
state = State.READ_VALUE;
|
|
}
|
|
break;
|
|
|
|
case READ_VALUE:
|
|
if (headerBlock.readableBytes() < length) {
|
|
return;
|
|
}
|
|
|
|
byte[] valueBytes = new byte[length];
|
|
headerBlock.readBytes(valueBytes);
|
|
|
|
// Add Name/Value pair to headers
|
|
int index = 0;
|
|
int offset = 0;
|
|
|
|
// Value must not start with a NULL character
|
|
if (valueBytes[0] == (byte) 0) {
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
break;
|
|
}
|
|
|
|
while (index < length) {
|
|
while (index < valueBytes.length && valueBytes[index] != (byte) 0) {
|
|
index ++;
|
|
}
|
|
if (index < valueBytes.length) {
|
|
// Received NULL character
|
|
if (index + 1 == valueBytes.length || valueBytes[index + 1] == (byte) 0) {
|
|
// Value field ended with a NULL character or
|
|
// received multiple, in-sequence NULL characters.
|
|
// Recipients of illegal value fields must issue a stream error
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
break;
|
|
}
|
|
}
|
|
String value = new String(valueBytes, offset, index - offset, "UTF-8");
|
|
|
|
try {
|
|
frame.headers().add(name, value);
|
|
} catch (IllegalArgumentException e) {
|
|
// Name contains NULL or non-ascii characters
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
break;
|
|
}
|
|
index ++;
|
|
offset = index;
|
|
}
|
|
|
|
name = null;
|
|
|
|
// If we broke out of the add header loop, break here
|
|
if (state == State.ERROR) {
|
|
break;
|
|
}
|
|
|
|
if (--numHeaders == 0) {
|
|
state = State.END_HEADER_BLOCK;
|
|
} else {
|
|
state = State.READ_NAME_LENGTH;
|
|
}
|
|
break;
|
|
|
|
case SKIP_VALUE:
|
|
skipLength = Math.min(headerBlock.readableBytes(), length);
|
|
headerBlock.skipBytes(skipLength);
|
|
length -= skipLength;
|
|
|
|
if (length == 0) {
|
|
if (--numHeaders == 0) {
|
|
state = State.END_HEADER_BLOCK;
|
|
} else {
|
|
state = State.READ_NAME_LENGTH;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case END_HEADER_BLOCK:
|
|
state = State.ERROR;
|
|
frame.setInvalid();
|
|
break;
|
|
|
|
case ERROR:
|
|
headerBlock.skipBytes(headerBlock.readableBytes());
|
|
return;
|
|
|
|
default:
|
|
throw new Error("Shouldn't reach here.");
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
void endHeaderBlock(SpdyHeadersFrame frame) throws Exception {
|
|
if (state != State.END_HEADER_BLOCK) {
|
|
frame.setInvalid();
|
|
}
|
|
|
|
releaseBuffer();
|
|
|
|
// Initialize header block decoding fields
|
|
headerSize = 0;
|
|
name = null;
|
|
state = State.READ_NUM_HEADERS;
|
|
}
|
|
|
|
@Override
|
|
void end() {
|
|
releaseBuffer();
|
|
}
|
|
|
|
private void releaseBuffer() {
|
|
if (cumulation != null) {
|
|
cumulation.release();
|
|
cumulation = null;
|
|
}
|
|
}
|
|
}
|