io.undertow.protocols.http2.Http2HeadersParser Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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 io.undertow.protocols.http2;
import java.nio.ByteBuffer;
import org.xnio.Bits;
/**
* Parser for HTTP2 Headers frames
*
* @author Stuart Douglas
*/
class Http2HeadersParser extends Http2HeaderBlockParser {
private static final int DEPENDENCY_MASK = ~(1 << 7);
private int paddingLength = 0;
private int dependentStreamId = 0;
private int weight = 16; //default weight as per spec
private boolean headersEndStream = false;
private boolean exclusive;
Http2HeadersParser(int frameLength, HpackDecoder hpackDecoder, boolean client,int maxHeaders, int streamId, int maxHeaderListSize) {
super(frameLength, hpackDecoder, client, maxHeaders, streamId, maxHeaderListSize);
}
@Override
protected boolean handleBeforeHeader(ByteBuffer resource, Http2FrameHeaderParser headerParser) {
boolean hasPadding = Bits.anyAreSet(headerParser.flags, Http2Channel.HEADERS_FLAG_PADDED);
boolean hasPriority = Bits.anyAreSet(headerParser.flags, Http2Channel.HEADERS_FLAG_PRIORITY);
headersEndStream = Bits.allAreSet(headerParser.flags, Http2Channel.HEADERS_FLAG_END_STREAM);
int reqLength = (hasPadding ? 1 : 0) + (hasPriority ? 5 : 0);
if (reqLength == 0) {
return true;
}
if (resource.remaining() < reqLength) {
return false;
}
if (hasPadding) {
paddingLength = (resource.get() & 0xFF);
}
if (hasPriority) {
if (resource.remaining() < 4) {
return false;
}
byte b = resource.get();
exclusive = (b & (1 << 7)) != 0;
dependentStreamId = (b & DEPENDENCY_MASK & 0xFF) << 24;
dependentStreamId += (resource.get() & 0xFF) << 16;
dependentStreamId += (resource.get() & 0xFF) << 8;
dependentStreamId += (resource.get() & 0xFF);
weight = resource.get() & 0xFF;
}
return true;
}
protected int getPaddingLength() {
return paddingLength;
}
int getDependentStreamId() {
return dependentStreamId;
}
int getWeight() {
return weight;
}
boolean isHeadersEndStream() {
return headersEndStream;
}
public boolean isExclusive() {
return exclusive;
}
}