| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.spdy.parser; |
| |
| import java.nio.ByteBuffer; |
| import java.util.EnumMap; |
| |
| import org.eclipse.jetty.spdy.CompressionFactory; |
| import org.eclipse.jetty.spdy.frames.ControlFrame; |
| import org.eclipse.jetty.spdy.frames.ControlFrameType; |
| |
| public abstract class ControlFrameParser |
| { |
| private final EnumMap<ControlFrameType, ControlFrameBodyParser> parsers = new EnumMap<>(ControlFrameType.class); |
| private final ControlFrameBodyParser unknownParser = new UnknownControlFrameBodyParser(this); |
| private State state = State.VERSION; |
| private int cursor; |
| private short version; |
| private short type; |
| private byte flags; |
| private int length; |
| private ControlFrameBodyParser bodyParser; |
| private int bytesToSkip = 0; |
| |
| public ControlFrameParser(CompressionFactory.Decompressor decompressor) |
| { |
| parsers.put(ControlFrameType.SYN_STREAM, new SynStreamBodyParser(decompressor, this)); |
| parsers.put(ControlFrameType.SYN_REPLY, new SynReplyBodyParser(decompressor, this)); |
| parsers.put(ControlFrameType.RST_STREAM, new RstStreamBodyParser(this)); |
| parsers.put(ControlFrameType.SETTINGS, new SettingsBodyParser(this)); |
| parsers.put(ControlFrameType.NOOP, new NoOpBodyParser(this)); |
| parsers.put(ControlFrameType.PING, new PingBodyParser(this)); |
| parsers.put(ControlFrameType.GO_AWAY, new GoAwayBodyParser(this)); |
| parsers.put(ControlFrameType.HEADERS, new HeadersBodyParser(decompressor, this)); |
| parsers.put(ControlFrameType.WINDOW_UPDATE, new WindowUpdateBodyParser(this)); |
| parsers.put(ControlFrameType.CREDENTIAL, new CredentialBodyParser(this)); |
| } |
| |
| public short getVersion() |
| { |
| return version; |
| } |
| |
| public byte getFlags() |
| { |
| return flags; |
| } |
| |
| public int getLength() |
| { |
| return length; |
| } |
| |
| public void skip(int bytesToSkip) |
| { |
| state = State.SKIP; |
| this.bytesToSkip = bytesToSkip; |
| } |
| |
| public boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case VERSION: |
| { |
| if (buffer.remaining() >= 2) |
| { |
| version = (short)(buffer.getShort() & 0x7F_FF); |
| state = State.TYPE; |
| } |
| else |
| { |
| state = State.VERSION_BYTES; |
| cursor = 2; |
| } |
| break; |
| } |
| case VERSION_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| version += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| version &= 0x7F_FF; |
| state = State.TYPE; |
| } |
| break; |
| } |
| case TYPE: |
| { |
| if (buffer.remaining() >= 2) |
| { |
| type = buffer.getShort(); |
| state = State.FLAGS; |
| } |
| else |
| { |
| state = State.TYPE_BYTES; |
| cursor = 2; |
| } |
| break; |
| } |
| case TYPE_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| type += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| state = State.FLAGS; |
| break; |
| } |
| case FLAGS: |
| { |
| flags = buffer.get(); |
| cursor = 3; |
| state = State.LENGTH; |
| break; |
| } |
| case LENGTH: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| length += (currByte & 0xFF) << 8 * cursor; |
| if (cursor > 0) |
| break; |
| |
| ControlFrameType controlFrameType = ControlFrameType.from(type); |
| |
| // SPEC v3, 2.2.1: unrecognized control frames must be ignored |
| if (controlFrameType == null) |
| bodyParser = unknownParser; |
| else |
| bodyParser = parsers.get(controlFrameType); |
| |
| state = State.BODY; |
| |
| // We have to let it fall through the next switch: |
| // the NOOP frame has no body and we cannot break |
| // because the buffer may be consumed and we will |
| // never enter the BODY case. |
| } |
| case BODY: |
| { |
| if (bodyParser.parse(buffer)) |
| { |
| reset(); |
| return true; |
| } |
| break; |
| } |
| case SKIP: |
| { |
| int remaining = buffer.remaining(); |
| if (remaining >= bytesToSkip) |
| { |
| buffer.position(buffer.position() + bytesToSkip); |
| reset(); |
| return true; |
| } |
| else |
| { |
| buffer.position(buffer.limit()); |
| bytesToSkip = bytesToSkip - remaining; |
| return false; |
| } |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| void reset() |
| { |
| state = State.VERSION; |
| cursor = 0; |
| version = 0; |
| type = 0; |
| flags = 0; |
| length = 0; |
| bodyParser = null; |
| bytesToSkip = 0; |
| } |
| |
| protected abstract void onControlFrame(ControlFrame frame); |
| |
| private enum State |
| { |
| VERSION, VERSION_BYTES, TYPE, TYPE_BYTES, FLAGS, LENGTH, BODY, SKIP |
| } |
| } |