| // |
| // ======================================================================== |
| // Copyright (c) 1995-2015 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.http2.parser; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.http2.ErrorCode; |
| import org.eclipse.jetty.http2.frames.DataFrame; |
| import org.eclipse.jetty.util.BufferUtil; |
| |
| public class DataBodyParser extends BodyParser |
| { |
| private State state = State.PREPARE; |
| private int padding; |
| private int paddingLength; |
| private int length; |
| |
| public DataBodyParser(HeaderParser headerParser, Parser.Listener listener) |
| { |
| super(headerParser, listener); |
| } |
| |
| private void reset() |
| { |
| state = State.PREPARE; |
| padding = 0; |
| paddingLength = 0; |
| length = 0; |
| } |
| |
| @Override |
| protected void emptyBody(ByteBuffer buffer) |
| { |
| if (isPadding()) |
| connectionFailure(buffer, ErrorCode.PROTOCOL_ERROR.code, "invalid_data_frame"); |
| else |
| onData(BufferUtil.EMPTY_BUFFER, false, 0); |
| } |
| |
| @Override |
| public boolean parse(ByteBuffer buffer) |
| { |
| boolean loop = false; |
| while (buffer.hasRemaining() || loop) |
| { |
| switch (state) |
| { |
| case PREPARE: |
| { |
| // SPEC: wrong streamId is treated as connection error. |
| if (getStreamId() == 0) |
| return connectionFailure(buffer, ErrorCode.PROTOCOL_ERROR.code, "invalid_data_frame"); |
| |
| length = getBodyLength(); |
| state = isPadding() ? State.PADDING_LENGTH : State.DATA; |
| break; |
| } |
| case PADDING_LENGTH: |
| { |
| padding = 1; // We have seen this byte. |
| paddingLength = buffer.get() & 0xFF; |
| --length; |
| length -= paddingLength; |
| state = State.DATA; |
| loop = length == 0; |
| if (length < 0) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "invalid_data_frame_padding"); |
| break; |
| } |
| case DATA: |
| { |
| int size = Math.min(buffer.remaining(), length); |
| int position = buffer.position(); |
| int limit = buffer.limit(); |
| buffer.limit(position + size); |
| ByteBuffer slice = buffer.slice(); |
| buffer.limit(limit); |
| buffer.position(position + size); |
| |
| length -= size; |
| if (length == 0) |
| { |
| state = State.PADDING; |
| loop = paddingLength == 0; |
| // Padding bytes include the bytes that define the |
| // padding length plus the actual padding bytes. |
| onData(slice, false, padding + paddingLength); |
| } |
| else |
| { |
| // We got partial data, simulate a smaller frame, and stay in DATA state. |
| // No padding for these synthetic frames (even if we have read |
| // the padding length already), it will be accounted at the end. |
| onData(slice, true, 0); |
| } |
| break; |
| } |
| case PADDING: |
| { |
| int size = Math.min(buffer.remaining(), paddingLength); |
| buffer.position(buffer.position() + size); |
| paddingLength -= size; |
| if (paddingLength == 0) |
| { |
| reset(); |
| return true; |
| } |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| private void onData(ByteBuffer buffer, boolean fragment, int padding) |
| { |
| DataFrame frame = new DataFrame(getStreamId(), buffer, !fragment && isEndStream(), padding); |
| notifyData(frame); |
| } |
| |
| private enum State |
| { |
| PREPARE, PADDING_LENGTH, DATA, PADDING |
| } |
| } |