Http11InputBuffer.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 org.apache.coyote.http11;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import org.apache.coyote.CloseNowException;
import org.apache.coyote.InputBuffer;
import org.apache.coyote.Request;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.http.HeaderUtil;
import org.apache.tomcat.util.http.parser.HttpHeaderParser;
import org.apache.tomcat.util.http.parser.HttpHeaderParser.HeaderDataSource;
import org.apache.tomcat.util.http.parser.HttpHeaderParser.HeaderParseStatus;
import org.apache.tomcat.util.http.parser.HttpParser;
import org.apache.tomcat.util.net.ApplicationBufferHandler;
import org.apache.tomcat.util.net.SocketWrapperBase;
import org.apache.tomcat.util.res.StringManager;
/**
* InputBuffer for HTTP that provides request header parsing as well as transfer encoding.
*/
public class Http11InputBuffer implements InputBuffer, ApplicationBufferHandler, HeaderDataSource {
// -------------------------------------------------------------- Constants
private static final Log log = LogFactory.getLog(Http11InputBuffer.class);
/**
* The string manager for this package.
*/
private static final StringManager sm = StringManager.getManager(Http11InputBuffer.class);
private static final byte[] CLIENT_PREFACE_START =
"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n".getBytes(StandardCharsets.ISO_8859_1);
/**
* Associated Coyote request.
*/
private final Request request;
/**
* State.
*/
private volatile boolean parsingHeader;
/**
* Swallow input ? (in the case of an expectation)
*/
private boolean swallowInput;
/**
* The read buffer.
*/
private ByteBuffer byteBuffer;
/**
* Pos of the end of the header in the buffer, which is also the start of the body.
*/
private int end;
/**
* Wrapper that provides access to the underlying socket.
*/
private SocketWrapperBase<?> wrapper;
/**
* Underlying input buffer.
*/
private InputBuffer inputStreamInputBuffer;
/**
* Filter library. Note: Filter[Constants.CHUNKED_FILTER] is always the "chunked" filter.
*/
private InputFilter[] filterLibrary;
/**
* Active filters (in order).
*/
private InputFilter[] activeFilters;
/**
* Index of the last active filter.
*/
private int lastActiveFilter;
/**
* Parsing state - used for non blocking parsing so that when more data arrives, we can pick up where we left off.
*/
private byte prevChr = 0;
private byte chr = 0;
private volatile boolean parsingRequestLine;
private int parsingRequestLinePhase = 0;
private boolean parsingRequestLineEol = false;
private int parsingRequestLineStart = 0;
private int parsingRequestLineQPos = -1;
private final HttpParser httpParser;
private final HttpHeaderParser httpHeaderParser;
/**
* Maximum allowed size of the HTTP request line plus headers plus any leading blank lines.
*/
private final int headerBufferSize;
/**
* Known size of the NioChannel read buffer.
*/
private int socketReadBufferSize;
// ----------------------------------------------------------- Constructors
public Http11InputBuffer(Request request, int headerBufferSize, HttpParser httpParser) {
this.request = request;
this.headerBufferSize = headerBufferSize;
this.httpParser = httpParser;
filterLibrary = new InputFilter[0];
activeFilters = new InputFilter[0];
lastActiveFilter = -1;
parsingRequestLine = true;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
parsingRequestLineQPos = -1;
parsingHeader = true;
httpHeaderParser = new HttpHeaderParser(this, request.getMimeHeaders(), true);
swallowInput = true;
inputStreamInputBuffer = new SocketInputBuffer();
}
// ------------------------------------------------------------- Properties
/**
* Add an input filter to the filter library.
*
* @throws NullPointerException if the supplied filter is null
*/
void addFilter(InputFilter filter) {
if (filter == null) {
throw new NullPointerException(sm.getString("iib.filter.npe"));
}
InputFilter[] newFilterLibrary = Arrays.copyOf(filterLibrary, filterLibrary.length + 1);
newFilterLibrary[filterLibrary.length] = filter;
filterLibrary = newFilterLibrary;
activeFilters = new InputFilter[filterLibrary.length];
}
/**
* Get filters.
*/
InputFilter[] getFilters() {
return filterLibrary;
}
/**
* Add an input filter to the filter library.
*/
void addActiveFilter(InputFilter filter) {
if (lastActiveFilter == -1) {
filter.setBuffer(inputStreamInputBuffer);
} else {
for (int i = 0; i <= lastActiveFilter; i++) {
if (activeFilters[i] == filter) {
return;
}
}
filter.setBuffer(activeFilters[lastActiveFilter]);
}
activeFilters[++lastActiveFilter] = filter;
filter.setRequest(request);
}
/**
* Set the swallow input flag.
*/
void setSwallowInput(boolean swallowInput) {
this.swallowInput = swallowInput;
}
// ---------------------------------------------------- InputBuffer Methods
@Override
public int doRead(ApplicationBufferHandler handler) throws IOException {
if (lastActiveFilter == -1) {
return inputStreamInputBuffer.doRead(handler);
} else {
return activeFilters[lastActiveFilter].doRead(handler);
}
}
// ------------------------------------------------------- Protected Methods
/**
* Recycle the input buffer. This should be called when closing the connection.
*/
void recycle() {
wrapper = null;
request.recycle();
for (int i = 0; i <= lastActiveFilter; i++) {
activeFilters[i].recycle();
}
byteBuffer.limit(0).position(0);
lastActiveFilter = -1;
swallowInput = true;
chr = 0;
prevChr = 0;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
parsingRequestLineQPos = -1;
httpHeaderParser.recycle();
// Recycled last because they are volatile
// All variables visible to this thread are guaranteed to be visible to
// any other thread once that thread reads the same volatile. The first
// action when parsing input data is to read one of these volatiles.
parsingRequestLine = true;
parsingHeader = true;
}
/**
* End processing of current HTTP request. Note: All bytes of the current request should have been already consumed.
* This method only resets all the pointers so that we are ready to parse the next HTTP request.
*/
void nextRequest() {
request.recycle();
if (byteBuffer.position() > 0) {
if (byteBuffer.remaining() > 0) {
// Copy leftover bytes to the beginning of the buffer
byteBuffer.compact();
byteBuffer.flip();
} else {
// Reset position and limit to 0
byteBuffer.position(0).limit(0);
}
}
// Recycle filters
for (int i = 0; i <= lastActiveFilter; i++) {
activeFilters[i].recycle();
}
// Reset pointers
lastActiveFilter = -1;
parsingHeader = true;
swallowInput = true;
parsingRequestLine = true;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
parsingRequestLineQPos = -1;
httpHeaderParser.recycle();
}
/**
* Read the request line. This function is meant to be used during the HTTP request header parsing. Do NOT attempt
* to read the request body using it.
*
* @throws IOException If an exception occurs during the underlying socket read operations, or if the given buffer
* is not big enough to accommodate the whole line.
*
* @return true if data is properly fed; false if no data is available immediately and thread should be freed
*/
boolean parseRequestLine(boolean keptAlive, int connectionTimeout, int keepAliveTimeout) throws IOException {
// check state
if (!parsingRequestLine) {
return true;
}
//
// Skipping blank lines
//
if (parsingRequestLinePhase < 2) {
do {
// Read new bytes if needed
if (byteBuffer.position() >= byteBuffer.limit()) {
if (keptAlive) {
// Haven't read any request data yet so use the keep-alive
// timeout.
wrapper.setReadTimeout(keepAliveTimeout);
}
if (!fill(false)) {
return false;
}
// At least one byte of the request has been received.
// Switch to the socket timeout.
wrapper.setReadTimeout(connectionTimeout);
}
if (!keptAlive && byteBuffer.position() == 0 && byteBuffer.limit() >= CLIENT_PREFACE_START.length) {
boolean prefaceMatch = true;
for (int i = 0; i < CLIENT_PREFACE_START.length && prefaceMatch; i++) {
if (CLIENT_PREFACE_START[i] != byteBuffer.get(i)) {
prefaceMatch = false;
}
}
if (prefaceMatch) {
// HTTP/2 preface matched
parsingRequestLinePhase = -1;
return false;
}
}
// Set the start time once we start reading data (even if it is
// just skipping blank lines)
if (parsingRequestLinePhase == 0) {
parsingRequestLinePhase = 1;
request.setStartTimeNanos(System.nanoTime());
}
chr = byteBuffer.get();
} while (chr == Constants.CR || chr == Constants.LF);
byteBuffer.position(byteBuffer.position() - 1);
parsingRequestLineStart = byteBuffer.position();
parsingRequestLinePhase = 2;
}
if (parsingRequestLinePhase == 2) {
//
// Reading the method name
// Method name is a token
//
boolean space = false;
while (!space) {
// Read new bytes if needed
if (byteBuffer.position() >= byteBuffer.limit()) {
if (!fill(false)) {
return false;
}
}
// Spec says method name is a token followed by a single SP but
// also be tolerant of multiple SP and/or HT.
int pos = byteBuffer.position();
chr = byteBuffer.get();
if (chr == Constants.SP || chr == Constants.HT) {
space = true;
request.method().setBytes(byteBuffer.array(), parsingRequestLineStart,
pos - parsingRequestLineStart);
} else if (!HttpParser.isToken(chr)) {
// Avoid unknown protocol triggering an additional error
request.protocol().setString(Constants.HTTP_11);
String invalidMethodValue = parseInvalid(parsingRequestLineStart, byteBuffer);
throw new IllegalArgumentException(sm.getString("iib.invalidmethod", invalidMethodValue));
}
}
parsingRequestLinePhase = 3;
}
if (parsingRequestLinePhase == 3) {
// Spec says single SP but also be tolerant of multiple SP and/or HT
boolean space = true;
while (space) {
// Read new bytes if needed
if (byteBuffer.position() >= byteBuffer.limit()) {
if (!fill(false)) {
return false;
}
}
chr = byteBuffer.get();
if (chr != Constants.SP && chr != Constants.HT) {
space = false;
byteBuffer.position(byteBuffer.position() - 1);
}
}
parsingRequestLineStart = byteBuffer.position();
parsingRequestLinePhase = 4;
}
if (parsingRequestLinePhase == 4) {
// Mark the current buffer position
int end = 0;
//
// Reading the URI
//
boolean space = false;
while (!space) {
// Read new bytes if needed
if (byteBuffer.position() >= byteBuffer.limit()) {
if (!fill(false)) {
return false;
}
}
int pos = byteBuffer.position();
prevChr = chr;
chr = byteBuffer.get();
if (prevChr == Constants.CR && chr != Constants.LF) {
// CR not followed by LF so not an HTTP/0.9 request and
// therefore invalid. Trigger error handling.
// Avoid unknown protocol triggering an additional error
request.protocol().setString(Constants.HTTP_11);
String invalidRequestTarget = parseInvalid(parsingRequestLineStart, byteBuffer);
throw new IllegalArgumentException(sm.getString("iib.invalidRequestTarget", invalidRequestTarget));
}
if (chr == Constants.SP || chr == Constants.HT) {
space = true;
end = pos;
} else if (chr == Constants.CR) {
// HTTP/0.9 style request. CR is optional. LF is not.
} else if (chr == Constants.LF) {
// HTTP/0.9 style request
// Stop this processing loop
space = true;
// Set blank protocol (indicates HTTP/0.9)
request.protocol().setString("");
// Skip the protocol processing
parsingRequestLinePhase = 7;
if (prevChr == Constants.CR) {
end = pos - 1;
} else {
end = pos;
}
} else if (chr == Constants.QUESTION && parsingRequestLineQPos == -1) {
parsingRequestLineQPos = pos;
} else if (parsingRequestLineQPos != -1 && !httpParser.isQueryRelaxed(chr)) {
// Avoid unknown protocol triggering an additional error
request.protocol().setString(Constants.HTTP_11);
// %nn decoding will be checked at the point of decoding
String invalidRequestTarget = parseInvalid(parsingRequestLineStart, byteBuffer);
throw new IllegalArgumentException(sm.getString("iib.invalidRequestTarget", invalidRequestTarget));
} else if (httpParser.isNotRequestTargetRelaxed(chr)) {
// Avoid unknown protocol triggering an additional error
request.protocol().setString(Constants.HTTP_11);
// This is a general check that aims to catch problems early
// Detailed checking of each part of the request target will
// happen in Http11Processor#prepareRequest()
String invalidRequestTarget = parseInvalid(parsingRequestLineStart, byteBuffer);
throw new IllegalArgumentException(sm.getString("iib.invalidRequestTarget", invalidRequestTarget));
}
}
if (parsingRequestLineQPos >= 0) {
request.queryString().setBytes(byteBuffer.array(), parsingRequestLineQPos + 1,
end - parsingRequestLineQPos - 1);
request.requestURI().setBytes(byteBuffer.array(), parsingRequestLineStart,
parsingRequestLineQPos - parsingRequestLineStart);
} else {
request.requestURI().setBytes(byteBuffer.array(), parsingRequestLineStart,
end - parsingRequestLineStart);
}
// HTTP/0.9 processing jumps to stage 7.
// Don't want to overwrite that here.
if (parsingRequestLinePhase == 4) {
parsingRequestLinePhase = 5;
}
}
if (parsingRequestLinePhase == 5) {
// Spec says single SP but also be tolerant of multiple and/or HT
boolean space = true;
while (space) {
// Read new bytes if needed
if (byteBuffer.position() >= byteBuffer.limit()) {
if (!fill(false)) {
return false;
}
}
byte chr = byteBuffer.get();
if (chr != Constants.SP && chr != Constants.HT) {
space = false;
byteBuffer.position(byteBuffer.position() - 1);
}
}
parsingRequestLineStart = byteBuffer.position();
parsingRequestLinePhase = 6;
// Mark the current buffer position
end = 0;
}
if (parsingRequestLinePhase == 6) {
//
// Reading the protocol
// Protocol is always "HTTP/" DIGIT "." DIGIT
//
while (!parsingRequestLineEol) {
// Read new bytes if needed
if (byteBuffer.position() >= byteBuffer.limit()) {
if (!fill(false)) {
return false;
}
}
int pos = byteBuffer.position();
prevChr = chr;
chr = byteBuffer.get();
if (chr == Constants.CR) {
// Possible end of request line. Need LF next else invalid.
} else if (prevChr == Constants.CR && chr == Constants.LF) {
// CRLF is the standard line terminator
end = pos - 1;
parsingRequestLineEol = true;
} else if (chr == Constants.LF) {
// LF is an optional line terminator
end = pos;
parsingRequestLineEol = true;
} else if (prevChr == Constants.CR || !HttpParser.isHttpProtocol(chr)) {
String invalidProtocol = parseInvalid(parsingRequestLineStart, byteBuffer);
throw new IllegalArgumentException(sm.getString("iib.invalidHttpProtocol", invalidProtocol));
}
}
if (end - parsingRequestLineStart > 0) {
request.protocol().setBytes(byteBuffer.array(), parsingRequestLineStart, end - parsingRequestLineStart);
parsingRequestLinePhase = 7;
}
// If no protocol is found, the ISE below will be triggered.
}
if (parsingRequestLinePhase == 7) {
// Parsing is complete. Return and clean-up.
parsingRequestLine = false;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
return true;
}
throw new IllegalStateException(sm.getString("iib.invalidPhase", Integer.valueOf(parsingRequestLinePhase)));
}
/**
* Parse the HTTP headers.
*
* @throws IOException an underlying I/O error occurred
*/
boolean parseHeaders() throws IOException {
if (!parsingHeader) {
throw new IllegalStateException(sm.getString("iib.parseheaders.ise.error"));
}
HeaderParseStatus status = HeaderParseStatus.HAVE_MORE_HEADERS;
do {
status = httpHeaderParser.parseHeader();
// Checking that
// (1) Headers plus request line size does not exceed its limit
// (2) There are enough bytes to avoid expanding the buffer when
// reading body
// Technically, (2) is technical limitation, (1) is logical
// limitation to enforce the meaning of headerBufferSize
// From the way how buf is allocated and how blank lines are being
// read, it should be enough to check (1) only.
if (byteBuffer.position() > headerBufferSize ||
byteBuffer.capacity() - byteBuffer.position() < socketReadBufferSize) {
throw new IllegalArgumentException(sm.getString("iib.requestheadertoolarge.error"));
}
} while (status == HeaderParseStatus.HAVE_MORE_HEADERS);
if (status == HeaderParseStatus.DONE) {
parsingHeader = false;
end = byteBuffer.position();
return true;
} else {
return false;
}
}
int getParsingRequestLinePhase() {
return parsingRequestLinePhase;
}
private String parseInvalid(int startPos, ByteBuffer buffer) {
// Look for the next space
byte b = 0;
while (buffer.hasRemaining() && b != 0x20) {
b = buffer.get();
}
String result = HeaderUtil.toPrintableString(buffer.array(), buffer.arrayOffset() + startPos,
buffer.position() - startPos);
if (b != 0x20) {
// Ran out of buffer rather than found a space
result = result + "...";
}
return result;
}
/**
* End request (consumes leftover bytes).
*
* @throws IOException an underlying I/O error occurred
*/
void endRequest() throws IOException {
if (swallowInput && (lastActiveFilter != -1)) {
int extraBytes = (int) activeFilters[lastActiveFilter].end();
byteBuffer.position(byteBuffer.position() - extraBytes);
}
}
@Override
public int available() {
return available(false);
}
/**
* Available bytes in the buffers for the current request. Note that when requests are pipelined, the data in
* byteBuffer may relate to the next request rather than this one.
*
* @return the amount of bytes available, 0 if none, and 1 if there was an IO error to trigger a read
*/
int available(boolean read) {
int available;
if (lastActiveFilter == -1) {
available = inputStreamInputBuffer.available();
} else {
available = activeFilters[lastActiveFilter].available();
}
// Only try a non-blocking read if:
// - there is no data in the filters
// - the caller requested a read
// - there is no data in byteBuffer
// - the socket wrapper indicates a read is allowed
//
// Notes: 1. When pipelined requests are being used available may be
// zero even when byteBuffer has data. This is because the data
// in byteBuffer is for the next request. We don't want to
// attempt a read in this case.
// 2. wrapper.hasDataToRead() is present to handle the NIO2 case
try {
if (available == 0 && read && !byteBuffer.hasRemaining() && wrapper.hasDataToRead()) {
fill(false);
available = byteBuffer.remaining();
}
} catch (IOException ioe) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("iib.available.readFail"), ioe);
}
// Not ideal. This will indicate that data is available which should
// trigger a read which in turn will trigger another IOException and
// that one can be thrown.
available = 1;
}
return available;
}
/**
* Has all of the request body been read? There are subtle differences between this and available() > 0 primarily
* because of having to handle faking non-blocking reads with the blocking IO connector.
*
* @return {@code true} if the request has been fully read
*/
boolean isFinished() {
// The active filters have the definitive information on whether or not
// the current request body has been read. Note that byteBuffer may
// contain pipelined data so is not a good indicator.
if (lastActiveFilter >= 0) {
return activeFilters[lastActiveFilter].isFinished();
} else {
// No filters. Assume request is not finished. EOF will signal end of
// request.
return false;
}
}
ByteBuffer getLeftover() {
int available = byteBuffer.remaining();
if (available > 0) {
return ByteBuffer.wrap(byteBuffer.array(), byteBuffer.position(), available);
} else {
return null;
}
}
boolean isChunking() {
for (int i = 0; i < lastActiveFilter; i++) {
if (activeFilters[i] == filterLibrary[Constants.CHUNKED_FILTER]) {
return true;
}
}
return false;
}
void init(SocketWrapperBase<?> socketWrapper) {
wrapper = socketWrapper;
wrapper.setAppReadBufHandler(this);
int bufLength = headerBufferSize + wrapper.getSocketBufferHandler().getReadBuffer().capacity();
if (byteBuffer == null || byteBuffer.capacity() < bufLength) {
byteBuffer = ByteBuffer.allocate(bufLength);
byteBuffer.position(0).limit(0);
}
}
@Override
public boolean fillHeaderBuffer() throws IOException {
// HTTP headers are always read using non-blocking IO.
return fill(false);
}
/**
* Attempts to read some data into the input buffer.
*
* @param block Should blocking IO be used when filling the input buffer
*
* @return <code>true</code> if more data was added to the input buffer otherwise <code>false</code>
*
* @throws IOException if an IO error occurs while filling the input buffer
*/
private boolean fill(boolean block) throws IOException {
if (log.isTraceEnabled()) {
log.trace("Before fill(): parsingHeader: [" + parsingHeader + "], parsingRequestLine: [" +
parsingRequestLine + "], parsingRequestLinePhase: [" + parsingRequestLinePhase +
"], parsingRequestLineStart: [" + parsingRequestLineStart + "], byteBuffer.position(): [" +
byteBuffer.position() + "], byteBuffer.limit(): [" + byteBuffer.limit() + "], end: [" + end + "]");
}
if (parsingHeader) {
if (byteBuffer.limit() >= headerBufferSize) {
if (parsingRequestLine) {
// Avoid unknown protocol triggering an additional error
request.protocol().setString(Constants.HTTP_11);
}
throw new IllegalArgumentException(sm.getString("iib.requestheadertoolarge.error"));
}
} else {
byteBuffer.limit(end).position(end);
}
int nRead = -1;
int mark = byteBuffer.position();
try {
if (byteBuffer.position() < byteBuffer.limit()) {
byteBuffer.position(byteBuffer.limit());
}
byteBuffer.limit(byteBuffer.capacity());
SocketWrapperBase<?> socketWrapper = this.wrapper;
if (socketWrapper != null) {
nRead = socketWrapper.read(block, byteBuffer);
} else {
throw new CloseNowException(sm.getString("iib.eof.error"));
}
} finally {
// Ensure that the buffer limit and position are returned to a
// consistent "ready for read" state if an error occurs during in
// the above code block.
// Some error conditions can result in the position being reset to
// zero which also invalidates the mark.
// https://bz.apache.org/bugzilla/show_bug.cgi?id=65677
if (byteBuffer.position() >= mark) {
// // Position and mark are consistent. Assume a read (possibly
// of zero bytes) has occurred.
byteBuffer.limit(byteBuffer.position());
byteBuffer.position(mark);
} else {
// Position and mark are inconsistent. Set position and limit to
// zero so effectively no data is reported as read.
byteBuffer.position(0);
byteBuffer.limit(0);
}
}
if (log.isTraceEnabled()) {
log.trace("Received [" + new String(byteBuffer.array(), byteBuffer.position(), byteBuffer.remaining(),
StandardCharsets.ISO_8859_1) + "]");
}
if (nRead > 0) {
return true;
} else if (nRead == -1) {
throw new EOFException(sm.getString("iib.eof.error"));
} else {
return false;
}
}
// ------------------------------------- InputStreamInputBuffer Inner Class
/**
* This class is an input buffer which will read its data from an input stream.
*/
private class SocketInputBuffer implements InputBuffer {
@Override
public int doRead(ApplicationBufferHandler handler) throws IOException {
if (byteBuffer.position() >= byteBuffer.limit()) {
// The application is reading the HTTP request body
boolean block = (request.getReadListener() == null);
if (!fill(block)) {
if (block) {
return -1;
} else {
return 0;
}
}
}
int length = byteBuffer.remaining();
handler.setByteBuffer(byteBuffer.duplicate());
byteBuffer.position(byteBuffer.limit());
return length;
}
@Override
public int available() {
return byteBuffer.remaining();
}
}
@Override
public void setByteBuffer(ByteBuffer buffer) {
byteBuffer = buffer;
}
@Override
public ByteBuffer getByteBuffer() {
return byteBuffer;
}
@Override
public ByteBuffer getHeaderByteBuffer() {
return getByteBuffer();
}
@Override
public void expand(int size) {
if (byteBuffer.capacity() >= size) {
byteBuffer.limit(size);
}
ByteBuffer temp = ByteBuffer.allocate(size);
temp.put(byteBuffer);
byteBuffer = temp;
byteBuffer.mark();
temp = null;
}
}