| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 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 org.eclipse.jetty.spdy.api.SPDY; |
| import org.eclipse.jetty.spdy.api.Settings; |
| import org.eclipse.jetty.spdy.frames.SettingsFrame; |
| |
| public class SettingsBodyParser extends ControlFrameBodyParser |
| { |
| private final Settings settings = new Settings(); |
| private final ControlFrameParser controlFrameParser; |
| private State state = State.COUNT; |
| private int cursor; |
| private int count; |
| private int idAndFlags; |
| private int value; |
| |
| public SettingsBodyParser(ControlFrameParser controlFrameParser) |
| { |
| this.controlFrameParser = controlFrameParser; |
| } |
| |
| @Override |
| public boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case COUNT: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| count = buffer.getInt(); |
| state = State.ID_FLAGS; |
| } |
| else |
| { |
| state = State.COUNT_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case COUNT_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| count += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| state = State.ID_FLAGS; |
| break; |
| } |
| case ID_FLAGS: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| idAndFlags = convertIdAndFlags(controlFrameParser.getVersion(), buffer.getInt()); |
| state = State.VALUE; |
| } |
| else |
| { |
| state = State.ID_FLAGS_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case ID_FLAGS_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| value += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| idAndFlags = convertIdAndFlags(controlFrameParser.getVersion(), value); |
| state = State.VALUE; |
| } |
| break; |
| } |
| case VALUE: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| value = buffer.getInt(); |
| if (onPair()) |
| return true; |
| } |
| else |
| { |
| state = State.VALUE_BYTES; |
| cursor = 4; |
| value = 0; |
| } |
| break; |
| } |
| case VALUE_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| value += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| if (onPair()) |
| return true; |
| } |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| private int convertIdAndFlags(short version, int idAndFlags) |
| { |
| switch (version) |
| { |
| case SPDY.V2: |
| { |
| // A bug in the Chromium implementation forces v2 to have |
| // 3 ID bytes little endian + 1 byte of flags |
| // Here we normalize this to conform with v3, which is |
| // 1 bytes of flag + 3 ID bytes big endian |
| int result = (idAndFlags & 0x00_00_00_FF) << 24; |
| result += (idAndFlags & 0x00_00_FF_00) << 8; |
| result += (idAndFlags & 0x00_FF_00_00) >>> 8; |
| result += (idAndFlags & 0xFF_00_00_00) >>> 24; |
| return result; |
| } |
| case SPDY.V3: |
| { |
| return idAndFlags; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| |
| private boolean onPair() |
| { |
| int id = idAndFlags & 0x00_FF_FF_FF; |
| byte flags = (byte)((idAndFlags & 0xFF_00_00_00) >>> 24); |
| settings.put(new Settings.Setting(Settings.ID.from(id), Settings.Flag.from(flags), value)); |
| state = State.ID_FLAGS; |
| idAndFlags = 0; |
| value = 0; |
| --count; |
| if (count == 0) |
| { |
| onSettings(); |
| return true; |
| } |
| return false; |
| } |
| |
| private void onSettings() |
| { |
| SettingsFrame frame = new SettingsFrame(controlFrameParser.getVersion(), controlFrameParser.getFlags(), new Settings(settings, true)); |
| controlFrameParser.onControlFrame(frame); |
| reset(); |
| } |
| |
| private void reset() |
| { |
| settings.clear(); |
| state = State.COUNT; |
| cursor = 0; |
| count = 0; |
| idAndFlags = 0; |
| value = 0; |
| } |
| |
| private enum State |
| { |
| COUNT, COUNT_BYTES, ID_FLAGS, ID_FLAGS_BYTES, VALUE, VALUE_BYTES |
| } |
| } |