| /** |
| * 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; |
| |
| /** |
| * ASN1, a tagged system. |
| */ |
| public class Tag { |
| private int tagFlags = 0; |
| private int tagNo = 0; |
| |
| public Tag(int tag) { |
| this.tagFlags = tag & 0xE0; |
| this.tagNo = tag & 0x1F; |
| } |
| |
| public Tag(UniversalTag tag) { |
| this.tagFlags = TagClass.UNIVERSAL.getValue(); |
| this.tagNo = tag.getValue(); |
| } |
| |
| public Tag(int tagFlags, int tagNo) { |
| this.tagFlags = tagFlags & 0xE0; |
| this.tagNo = tagNo; |
| } |
| |
| public Tag(TagClass tagClass, int tagNo) { |
| this.tagFlags = tagClass.getValue(); |
| this.tagNo = tagNo; |
| } |
| |
| public Tag(Tag other) { |
| this(other.tagFlags, other.tagNo); |
| } |
| |
| public TagClass tagClass() { |
| return TagClass.fromTag(tagFlags); |
| } |
| |
| public void usePrimitive(boolean isPrimitive) { |
| if (isPrimitive) { |
| tagFlags &= ~0x20; |
| } else { |
| tagFlags |= 0x20; |
| } |
| } |
| |
| public boolean isPrimitive() { |
| return (tagFlags & 0x20) == 0; |
| } |
| |
| public int tagFlags() { |
| return tagFlags; |
| } |
| |
| public int tagNo() { |
| return tagNo; |
| } |
| |
| public UniversalTag universalTag() { |
| if (isUniversal()) { |
| return UniversalTag.fromValue(tagNo()); |
| } |
| return UniversalTag.UNKNOWN; |
| } |
| |
| public boolean isEOC() { |
| return universalTag() == UniversalTag.EOC; |
| } |
| |
| public boolean isNull() { |
| return universalTag() == UniversalTag.NULL; |
| } |
| |
| public boolean isUniversal() { |
| return tagClass().isUniversal(); |
| } |
| |
| public boolean isAppSpecific() { |
| return tagClass().isAppSpecific(); |
| } |
| |
| public boolean isContextSpecific() { |
| return tagClass().isContextSpecific(); |
| } |
| |
| public boolean isSpecific() { |
| return tagClass().isSpecific(); |
| } |
| |
| public byte tagByte() { |
| int n = tagFlags | (tagNo < 0x1F ? tagNo : 0x1F); |
| return (byte) (n & 0xFF); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| Tag tag = (Tag) o; |
| |
| if (tagFlags != tag.tagFlags) { |
| return false; |
| } |
| |
| return tagNo == tag.tagNo; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = tagFlags; |
| result = 31 * result + tagNo; |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("0x%02X", tagByte()); |
| } |
| |
| public static Tag newAppTag(int tagNo) { |
| return new Tag(TagClass.APPLICATION, tagNo); |
| } |
| |
| public static Tag newCtxTag(int tagNo) { |
| return new Tag(TagClass.CONTEXT_SPECIFIC, tagNo); |
| } |
| } |