c076c33901
- Add useful static methods to AsciiString - Add more getters in TextHeaders - Remove unnecessary utility methods in SpdyHttpHeaders
770 lines
26 KiB
Java
770 lines
26 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufProcessor;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.AsciiString;
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import io.netty.handler.codec.DecoderResult;
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import io.netty.handler.codec.ReplayingDecoder;
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import io.netty.handler.codec.TooLongFrameException;
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import io.netty.util.internal.AppendableCharSequence;
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import java.util.List;
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import static io.netty.buffer.ByteBufUtil.*;
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/**
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* Decodes {@link ByteBuf}s into {@link HttpMessage}s and
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* {@link HttpContent}s.
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*
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* <h3>Parameters that prevents excessive memory consumption</h3>
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* <table border="1">
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* <tr>
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* <th>Name</th><th>Meaning</th>
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* </tr>
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* <tr>
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* <td>{@code maxInitialLineLength}</td>
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* <td>The maximum length of the initial line
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* (e.g. {@code "GET / HTTP/1.0"} or {@code "HTTP/1.0 200 OK"})
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* If the length of the initial line exceeds this value, a
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* {@link TooLongFrameException} will be raised.</td>
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* </tr>
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* <tr>
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* <td>{@code maxHeaderSize}</td>
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* <td>The maximum length of all headers. If the sum of the length of each
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* header exceeds this value, a {@link TooLongFrameException} will be raised.</td>
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* </tr>
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* <tr>
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* <td>{@code maxChunkSize}</td>
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* <td>The maximum length of the content or each chunk. If the content length
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* (or the length of each chunk) exceeds this value, the content or chunk
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* will be split into multiple {@link HttpContent}s whose length is
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* {@code maxChunkSize} at maximum.</td>
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* </tr>
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* </table>
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*
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* <h3>Chunked Content</h3>
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*
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* If the content of an HTTP message is greater than {@code maxChunkSize} or
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* the transfer encoding of the HTTP message is 'chunked', this decoder
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* generates one {@link HttpMessage} instance and its following
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* {@link HttpContent}s per single HTTP message to avoid excessive memory
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* consumption. For example, the following HTTP message:
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* <pre>
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* GET / HTTP/1.1
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* Transfer-Encoding: chunked
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*
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* 1a
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* abcdefghijklmnopqrstuvwxyz
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* 10
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* 1234567890abcdef
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* 0
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* Content-MD5: ...
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* <i>[blank line]</i>
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* </pre>
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* triggers {@link HttpRequestDecoder} to generate 3 objects:
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* <ol>
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* <li>An {@link HttpRequest},</li>
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* <li>The first {@link HttpContent} whose content is {@code 'abcdefghijklmnopqrstuvwxyz'},</li>
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* <li>The second {@link LastHttpContent} whose content is {@code '1234567890abcdef'}, which marks
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* the end of the content.</li>
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* </ol>
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*
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* If you prefer not to handle {@link HttpContent}s by yourself for your
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* convenience, insert {@link HttpObjectAggregator} after this decoder in the
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* {@link ChannelPipeline}. However, please note that your server might not
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* be as memory efficient as without the aggregator.
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*
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* <h3>Extensibility</h3>
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*
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* Please note that this decoder is designed to be extended to implement
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* a protocol derived from HTTP, such as
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* <a href="http://en.wikipedia.org/wiki/Real_Time_Streaming_Protocol">RTSP</a> and
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* <a href="http://en.wikipedia.org/wiki/Internet_Content_Adaptation_Protocol">ICAP</a>.
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* To implement the decoder of such a derived protocol, extend this class and
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* implement all abstract methods properly.
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*/
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public abstract class HttpObjectDecoder extends ReplayingDecoder<HttpObjectDecoder.State> {
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private final int maxInitialLineLength;
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private final int maxHeaderSize;
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private final int maxChunkSize;
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private final boolean chunkedSupported;
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protected final boolean validateHeaders;
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private final AppendableCharSequence seq = new AppendableCharSequence(128);
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private final HeaderParser headerParser = new HeaderParser(seq);
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private final LineParser lineParser = new LineParser(seq);
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private HttpMessage message;
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private long chunkSize;
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private int headerSize;
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private long contentLength = Long.MIN_VALUE;
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private volatile boolean resetRequested;
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/**
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* The internal state of {@link HttpObjectDecoder}.
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* <em>Internal use only</em>.
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*/
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enum State {
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SKIP_CONTROL_CHARS,
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READ_INITIAL,
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READ_HEADER,
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READ_VARIABLE_LENGTH_CONTENT,
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READ_FIXED_LENGTH_CONTENT,
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READ_CHUNK_SIZE,
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READ_CHUNKED_CONTENT,
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READ_CHUNK_DELIMITER,
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READ_CHUNK_FOOTER,
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BAD_MESSAGE,
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UPGRADED
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}
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/**
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* Creates a new instance with the default
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* {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
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* {@code maxChunkSize (8192)}.
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*/
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protected HttpObjectDecoder() {
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this(4096, 8192, 8192, true);
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}
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/**
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* Creates a new instance with the specified parameters.
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*/
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protected HttpObjectDecoder(
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int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean chunkedSupported) {
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this(maxInitialLineLength, maxHeaderSize, maxChunkSize, chunkedSupported, true);
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}
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/**
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* Creates a new instance with the specified parameters.
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*/
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protected HttpObjectDecoder(
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int maxInitialLineLength, int maxHeaderSize, int maxChunkSize,
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boolean chunkedSupported, boolean validateHeaders) {
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super(State.SKIP_CONTROL_CHARS);
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if (maxInitialLineLength <= 0) {
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throw new IllegalArgumentException(
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"maxInitialLineLength must be a positive integer: " +
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maxInitialLineLength);
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}
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if (maxHeaderSize <= 0) {
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throw new IllegalArgumentException(
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"maxHeaderSize must be a positive integer: " +
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maxHeaderSize);
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}
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if (maxChunkSize <= 0) {
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throw new IllegalArgumentException(
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"maxChunkSize must be a positive integer: " +
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maxChunkSize);
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}
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this.maxInitialLineLength = maxInitialLineLength;
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this.maxHeaderSize = maxHeaderSize;
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this.maxChunkSize = maxChunkSize;
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this.chunkedSupported = chunkedSupported;
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this.validateHeaders = validateHeaders;
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List<Object> out) throws Exception {
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if (resetRequested) {
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resetNow();
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}
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switch (state()) {
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case SKIP_CONTROL_CHARS: {
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try {
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skipControlCharacters(buffer);
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checkpoint(State.READ_INITIAL);
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} finally {
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checkpoint();
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}
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}
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case READ_INITIAL: try {
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String[] initialLine = splitInitialLine(lineParser.parse(buffer));
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if (initialLine.length < 3) {
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// Invalid initial line - ignore.
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checkpoint(State.SKIP_CONTROL_CHARS);
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return;
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}
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message = createMessage(initialLine);
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checkpoint(State.READ_HEADER);
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} catch (Exception e) {
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out.add(invalidMessage(e));
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return;
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}
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case READ_HEADER: try {
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State nextState = readHeaders(buffer);
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checkpoint(nextState);
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if (nextState == State.READ_CHUNK_SIZE) {
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if (!chunkedSupported) {
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throw new IllegalArgumentException("Chunked messages not supported");
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}
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// Chunked encoding - generate HttpMessage first. HttpChunks will follow.
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out.add(message);
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return;
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}
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if (nextState == State.SKIP_CONTROL_CHARS) {
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// No content is expected.
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out.add(message);
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out.add(LastHttpContent.EMPTY_LAST_CONTENT);
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resetNow();
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return;
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}
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long contentLength = contentLength();
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if (contentLength == 0 || contentLength == -1 && isDecodingRequest()) {
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out.add(message);
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out.add(LastHttpContent.EMPTY_LAST_CONTENT);
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resetNow();
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return;
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}
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assert nextState == State.READ_FIXED_LENGTH_CONTENT || nextState == State.READ_VARIABLE_LENGTH_CONTENT;
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out.add(message);
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if (nextState == State.READ_FIXED_LENGTH_CONTENT) {
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// chunkSize will be decreased as the READ_FIXED_LENGTH_CONTENT state reads data chunk by chunk.
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chunkSize = contentLength;
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}
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// We return here, this forces decode to be called again where we will decode the content
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return;
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} catch (Exception e) {
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out.add(invalidMessage(e));
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return;
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}
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case READ_VARIABLE_LENGTH_CONTENT: {
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// Keep reading data as a chunk until the end of connection is reached.
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int toRead = Math.min(actualReadableBytes(), maxChunkSize);
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if (toRead > 0) {
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ByteBuf content = readBytes(ctx.alloc(), buffer, toRead);
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if (buffer.isReadable()) {
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out.add(new DefaultHttpContent(content));
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} else {
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// End of connection.
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out.add(new DefaultLastHttpContent(content, validateHeaders));
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resetNow();
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}
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} else if (!buffer.isReadable()) {
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// End of connection.
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out.add(LastHttpContent.EMPTY_LAST_CONTENT);
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resetNow();
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}
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return;
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}
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case READ_FIXED_LENGTH_CONTENT: {
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int readLimit = actualReadableBytes();
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// Check if the buffer is readable first as we use the readable byte count
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// to create the HttpChunk. This is needed as otherwise we may end up with
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// create a HttpChunk instance that contains an empty buffer and so is
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// handled like it is the last HttpChunk.
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//
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// See https://github.com/netty/netty/issues/433
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if (readLimit == 0) {
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return;
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}
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int toRead = Math.min(readLimit, maxChunkSize);
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if (toRead > chunkSize) {
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toRead = (int) chunkSize;
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}
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ByteBuf content = readBytes(ctx.alloc(), buffer, toRead);
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chunkSize -= toRead;
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if (chunkSize == 0) {
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// Read all content.
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out.add(new DefaultLastHttpContent(content, validateHeaders));
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resetNow();
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} else {
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out.add(new DefaultHttpContent(content));
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}
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return;
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}
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/**
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* everything else after this point takes care of reading chunked content. basically, read chunk size,
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* read chunk, read and ignore the CRLF and repeat until 0
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*/
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case READ_CHUNK_SIZE: try {
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AppendableCharSequence line = lineParser.parse(buffer);
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int chunkSize = getChunkSize(line.toString());
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this.chunkSize = chunkSize;
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if (chunkSize == 0) {
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checkpoint(State.READ_CHUNK_FOOTER);
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return;
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} else {
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checkpoint(State.READ_CHUNKED_CONTENT);
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}
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} catch (Exception e) {
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out.add(invalidChunk(e));
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return;
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}
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case READ_CHUNKED_CONTENT: {
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assert chunkSize <= Integer.MAX_VALUE;
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int toRead = Math.min((int) chunkSize, maxChunkSize);
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HttpContent chunk = new DefaultHttpContent(readBytes(ctx.alloc(), buffer, toRead));
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chunkSize -= toRead;
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out.add(chunk);
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if (chunkSize == 0) {
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// Read all content.
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checkpoint(State.READ_CHUNK_DELIMITER);
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} else {
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return;
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}
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}
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case READ_CHUNK_DELIMITER: {
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for (;;) {
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byte next = buffer.readByte();
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if (next == HttpConstants.CR) {
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if (buffer.readByte() == HttpConstants.LF) {
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checkpoint(State.READ_CHUNK_SIZE);
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return;
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}
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} else if (next == HttpConstants.LF) {
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checkpoint(State.READ_CHUNK_SIZE);
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return;
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} else {
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checkpoint();
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}
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}
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}
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case READ_CHUNK_FOOTER: try {
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LastHttpContent trailer = readTrailingHeaders(buffer);
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out.add(trailer);
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resetNow();
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return;
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} catch (Exception e) {
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out.add(invalidChunk(e));
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return;
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}
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case BAD_MESSAGE: {
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// Keep discarding until disconnection.
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buffer.skipBytes(actualReadableBytes());
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break;
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}
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case UPGRADED: {
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int readableBytes = actualReadableBytes();
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if (readableBytes > 0) {
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// Keep on consuming as otherwise we may trigger an DecoderException,
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// other handler will replace this codec with the upgraded protocol codec to
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// take the traffic over at some point then.
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// See https://github.com/netty/netty/issues/2173
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out.add(buffer.readBytes(actualReadableBytes()));
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}
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break;
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}
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}
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}
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@Override
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protected void decodeLast(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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decode(ctx, in, out);
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// Handle the last unfinished message.
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if (message != null) {
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// Check if the closure of the connection signifies the end of the content.
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boolean prematureClosure;
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if (isDecodingRequest()) {
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// The last request did not wait for a response.
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prematureClosure = true;
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} else {
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// Compare the length of the received content and the 'Content-Length' header.
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// If the 'Content-Length' header is absent, the length of the content is determined by the end of the
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// connection, so it is perfectly fine.
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prematureClosure = contentLength() > 0;
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}
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resetNow();
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if (!prematureClosure) {
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out.add(LastHttpContent.EMPTY_LAST_CONTENT);
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}
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}
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}
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protected boolean isContentAlwaysEmpty(HttpMessage msg) {
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if (msg instanceof HttpResponse) {
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HttpResponse res = (HttpResponse) msg;
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int code = res.getStatus().code();
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// Correctly handle return codes of 1xx.
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//
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// See:
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// - http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html Section 4.4
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// - https://github.com/netty/netty/issues/222
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if (code >= 100 && code < 200) {
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// One exception: Hixie 76 websocket handshake response
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return !(code == 101 && !res.headers().contains(HttpHeaders.Names.SEC_WEBSOCKET_ACCEPT));
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}
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switch (code) {
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case 204: case 205: case 304:
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return true;
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}
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}
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return false;
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}
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/**
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* Resets the state of the decoder so that it is ready to decode a new message.
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* This method is useful for handling a rejected request with {@code Expect: 100-continue} header.
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*/
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public void reset() {
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resetRequested = true;
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}
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private void resetNow() {
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HttpMessage message = this.message;
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this.message = null;
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contentLength = Long.MIN_VALUE;
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if (!isDecodingRequest()) {
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HttpResponse res = (HttpResponse) message;
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if (res != null && res.getStatus().code() == 101) {
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checkpoint(State.UPGRADED);
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return;
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}
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}
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checkpoint(State.SKIP_CONTROL_CHARS);
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}
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private HttpMessage invalidMessage(Exception cause) {
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checkpoint(State.BAD_MESSAGE);
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if (message != null) {
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message.setDecoderResult(DecoderResult.failure(cause));
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} else {
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message = createInvalidMessage();
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message.setDecoderResult(DecoderResult.failure(cause));
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}
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HttpMessage ret = message;
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message = null;
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return ret;
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}
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private HttpContent invalidChunk(Exception cause) {
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checkpoint(State.BAD_MESSAGE);
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HttpContent chunk = new DefaultLastHttpContent(Unpooled.EMPTY_BUFFER);
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chunk.setDecoderResult(DecoderResult.failure(cause));
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message = null;
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return chunk;
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}
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private static void skipControlCharacters(ByteBuf buffer) {
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for (;;) {
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char c = (char) buffer.readUnsignedByte();
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if (!Character.isISOControl(c) &&
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!Character.isWhitespace(c)) {
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buffer.readerIndex(buffer.readerIndex() - 1);
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break;
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}
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}
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}
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private State readHeaders(ByteBuf buffer) {
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headerSize = 0;
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final HttpMessage message = this.message;
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final HttpHeaders headers = message.headers();
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AppendableCharSequence line = headerParser.parse(buffer);
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String name = null;
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String value = null;
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if (line.length() > 0) {
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headers.clear();
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do {
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char firstChar = line.charAt(0);
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if (name != null && (firstChar == ' ' || firstChar == '\t')) {
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value = value + ' ' + line.toString().trim();
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} else {
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if (name != null) {
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headers.add(name, value);
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}
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String[] header = splitHeader(line);
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name = header[0];
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value = header[1];
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}
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line = headerParser.parse(buffer);
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} while (line.length() > 0);
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// Add the last header.
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if (name != null) {
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headers.add(name, value);
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}
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}
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State nextState;
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if (isContentAlwaysEmpty(message)) {
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HttpHeaders.removeTransferEncodingChunked(message);
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nextState = State.SKIP_CONTROL_CHARS;
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} else if (HttpHeaders.isTransferEncodingChunked(message)) {
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nextState = State.READ_CHUNK_SIZE;
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} else if (contentLength() >= 0) {
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nextState = State.READ_FIXED_LENGTH_CONTENT;
|
|
} else {
|
|
nextState = State.READ_VARIABLE_LENGTH_CONTENT;
|
|
}
|
|
return nextState;
|
|
}
|
|
|
|
private long contentLength() {
|
|
if (contentLength == Long.MIN_VALUE) {
|
|
contentLength = HttpHeaders.getContentLength(message, -1);
|
|
}
|
|
return contentLength;
|
|
}
|
|
|
|
private LastHttpContent readTrailingHeaders(ByteBuf buffer) {
|
|
headerSize = 0;
|
|
AppendableCharSequence line = headerParser.parse(buffer);
|
|
String lastHeader = null;
|
|
if (line.length() > 0) {
|
|
LastHttpContent trailer = new DefaultLastHttpContent(Unpooled.EMPTY_BUFFER, validateHeaders);
|
|
do {
|
|
char firstChar = line.charAt(0);
|
|
if (lastHeader != null && (firstChar == ' ' || firstChar == '\t')) {
|
|
List<String> current = trailer.trailingHeaders().getAll(lastHeader);
|
|
if (!current.isEmpty()) {
|
|
int lastPos = current.size() - 1;
|
|
String newString = current.get(lastPos) + line.toString().trim();
|
|
current.set(lastPos, newString);
|
|
} else {
|
|
// Content-Length, Transfer-Encoding, or Trailer
|
|
}
|
|
} else {
|
|
String[] header = splitHeader(line);
|
|
String name = header[0];
|
|
if (!AsciiString.equalsIgnoreCase(name, HttpHeaders.Names.CONTENT_LENGTH) &&
|
|
!AsciiString.equalsIgnoreCase(name, HttpHeaders.Names.TRANSFER_ENCODING) &&
|
|
!AsciiString.equalsIgnoreCase(name, HttpHeaders.Names.TRAILER)) {
|
|
trailer.trailingHeaders().add(name, header[1]);
|
|
}
|
|
lastHeader = name;
|
|
}
|
|
|
|
line = headerParser.parse(buffer);
|
|
} while (line.length() > 0);
|
|
|
|
return trailer;
|
|
}
|
|
|
|
return LastHttpContent.EMPTY_LAST_CONTENT;
|
|
}
|
|
|
|
protected abstract boolean isDecodingRequest();
|
|
protected abstract HttpMessage createMessage(String[] initialLine) throws Exception;
|
|
protected abstract HttpMessage createInvalidMessage();
|
|
|
|
private static int getChunkSize(String hex) {
|
|
hex = hex.trim();
|
|
for (int i = 0; i < hex.length(); i ++) {
|
|
char c = hex.charAt(i);
|
|
if (c == ';' || Character.isWhitespace(c) || Character.isISOControl(c)) {
|
|
hex = hex.substring(0, i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return Integer.parseInt(hex, 16);
|
|
}
|
|
|
|
private static String[] splitInitialLine(AppendableCharSequence sb) {
|
|
int aStart;
|
|
int aEnd;
|
|
int bStart;
|
|
int bEnd;
|
|
int cStart;
|
|
int cEnd;
|
|
|
|
aStart = findNonWhitespace(sb, 0);
|
|
aEnd = findWhitespace(sb, aStart);
|
|
|
|
bStart = findNonWhitespace(sb, aEnd);
|
|
bEnd = findWhitespace(sb, bStart);
|
|
|
|
cStart = findNonWhitespace(sb, bEnd);
|
|
cEnd = findEndOfString(sb);
|
|
|
|
return new String[] {
|
|
sb.substring(aStart, aEnd),
|
|
sb.substring(bStart, bEnd),
|
|
cStart < cEnd? sb.substring(cStart, cEnd) : "" };
|
|
}
|
|
|
|
private static String[] splitHeader(AppendableCharSequence sb) {
|
|
final int length = sb.length();
|
|
int nameStart;
|
|
int nameEnd;
|
|
int colonEnd;
|
|
int valueStart;
|
|
int valueEnd;
|
|
|
|
nameStart = findNonWhitespace(sb, 0);
|
|
for (nameEnd = nameStart; nameEnd < length; nameEnd ++) {
|
|
char ch = sb.charAt(nameEnd);
|
|
if (ch == ':' || Character.isWhitespace(ch)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (colonEnd = nameEnd; colonEnd < length; colonEnd ++) {
|
|
if (sb.charAt(colonEnd) == ':') {
|
|
colonEnd ++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
valueStart = findNonWhitespace(sb, colonEnd);
|
|
if (valueStart == length) {
|
|
return new String[] {
|
|
sb.substring(nameStart, nameEnd),
|
|
""
|
|
};
|
|
}
|
|
|
|
valueEnd = findEndOfString(sb);
|
|
return new String[] {
|
|
sb.substring(nameStart, nameEnd),
|
|
sb.substring(valueStart, valueEnd)
|
|
};
|
|
}
|
|
|
|
private static int findNonWhitespace(CharSequence sb, int offset) {
|
|
int result;
|
|
for (result = offset; result < sb.length(); result ++) {
|
|
if (!Character.isWhitespace(sb.charAt(result))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private static int findWhitespace(CharSequence sb, int offset) {
|
|
int result;
|
|
for (result = offset; result < sb.length(); result ++) {
|
|
if (Character.isWhitespace(sb.charAt(result))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private static int findEndOfString(CharSequence sb) {
|
|
int result;
|
|
for (result = sb.length(); result > 0; result --) {
|
|
if (!Character.isWhitespace(sb.charAt(result - 1))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private final class HeaderParser implements ByteBufProcessor {
|
|
private final AppendableCharSequence seq;
|
|
|
|
HeaderParser(AppendableCharSequence seq) {
|
|
this.seq = seq;
|
|
}
|
|
|
|
public AppendableCharSequence parse(ByteBuf buffer) {
|
|
seq.reset();
|
|
headerSize = 0;
|
|
int i = buffer.forEachByte(this);
|
|
buffer.readerIndex(i + 1);
|
|
return seq;
|
|
}
|
|
|
|
@Override
|
|
public boolean process(byte value) throws Exception {
|
|
char nextByte = (char) value;
|
|
headerSize++;
|
|
if (nextByte == HttpConstants.CR) {
|
|
return true;
|
|
}
|
|
if (nextByte == HttpConstants.LF) {
|
|
return false;
|
|
}
|
|
|
|
// Abort decoding if the header part is too large.
|
|
if (headerSize >= maxHeaderSize) {
|
|
// TODO: Respond with Bad Request and discard the traffic
|
|
// or close the connection.
|
|
// No need to notify the upstream handlers - just log.
|
|
// If decoding a response, just throw an exception.
|
|
throw new TooLongFrameException(
|
|
"HTTP header is larger than " +
|
|
maxHeaderSize + " bytes.");
|
|
}
|
|
|
|
seq.append(nextByte);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
private final class LineParser implements ByteBufProcessor {
|
|
private final AppendableCharSequence seq;
|
|
private int size;
|
|
|
|
LineParser(AppendableCharSequence seq) {
|
|
this.seq = seq;
|
|
}
|
|
|
|
public AppendableCharSequence parse(ByteBuf buffer) {
|
|
seq.reset();
|
|
size = 0;
|
|
int i = buffer.forEachByte(this);
|
|
buffer.readerIndex(i + 1);
|
|
return seq;
|
|
}
|
|
|
|
@Override
|
|
public boolean process(byte value) throws Exception {
|
|
char nextByte = (char) value;
|
|
if (nextByte == HttpConstants.CR) {
|
|
return true;
|
|
} else if (nextByte == HttpConstants.LF) {
|
|
return false;
|
|
} else {
|
|
if (size >= maxInitialLineLength) {
|
|
// TODO: Respond with Bad Request and discard the traffic
|
|
// or close the connection.
|
|
// No need to notify the upstream handlers - just log.
|
|
// If decoding a response, just throw an exception.
|
|
throw new TooLongFrameException(
|
|
"An HTTP line is larger than " + maxInitialLineLength +
|
|
" bytes.");
|
|
}
|
|
size ++;
|
|
seq.append(nextByte);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|