| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.kerby.asn1.parse; |
| |
| import org.apache.kerby.asn1.Tag; |
| |
| import java.nio.ByteBuffer; |
| |
| public class Asn1Header { |
| private Tag tag; |
| private int length; |
| private int bodyStart; |
| private int bodyEnd; |
| private ByteBuffer buffer; |
| |
| public Asn1Header(Tag tag, int length, |
| int bodyStart, ByteBuffer buffer) { |
| this.tag = tag; |
| this.length = length; |
| this.bodyStart = bodyStart; |
| this.buffer = buffer; |
| |
| this.bodyEnd = isDefinitiveLength() ? bodyStart + length : -1; |
| } |
| |
| public Tag getTag() { |
| return tag; |
| } |
| |
| public int getActualBodyLength() { |
| if (isDefinitiveLength()) { |
| return getLength(); |
| } else if (getBodyEnd() != -1) { |
| return getBodyEnd() - getBodyStart(); |
| } |
| return -1; |
| } |
| |
| public int getLength() { |
| return length; |
| } |
| |
| public int getBodyStart() { |
| return bodyStart; |
| } |
| |
| public int getBodyEnd() { |
| return bodyEnd; |
| } |
| |
| public void setBodyEnd(int bodyEnd) { |
| this.bodyEnd = bodyEnd; |
| } |
| |
| public ByteBuffer getBuffer() { |
| return buffer; |
| } |
| |
| public ByteBuffer getBodyBuffer() { |
| ByteBuffer result = buffer.duplicate(); |
| result.position(bodyStart); |
| |
| int end = getBodyEnd(); |
| if (end >= bodyStart) { |
| result.limit(end); |
| } |
| |
| return result; |
| } |
| |
| public boolean isEOC() { |
| return length == 0 && tag.isEOC(); |
| } |
| |
| public boolean isDefinitiveLength() { |
| return length != -1; |
| } |
| |
| public boolean checkBodyFinished(int pos) { |
| return getBodyEnd() != -1 && pos >= getBodyEnd(); |
| } |
| } |