| /** |
| * 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.type; |
| |
| import org.apache.kerby.asn1.UniversalTag; |
| |
| import java.io.IOException; |
| |
| public class Asn1BitString extends Asn1Simple<byte[]> { |
| private int padding; |
| |
| public Asn1BitString() { |
| this(null); |
| } |
| |
| public Asn1BitString(byte[] value) { |
| this(value, 0); |
| } |
| |
| public Asn1BitString(byte[] value, int padding) { |
| super(UniversalTag.BIT_STRING, value); |
| this.padding = padding; |
| } |
| |
| public void setPadding(int padding) { |
| this.padding = padding; |
| } |
| |
| public int getPadding() { |
| return padding; |
| } |
| |
| @Override |
| protected int encodingBodyLength() { |
| byte[] body = getValue(); |
| if (body != null) { |
| return body.length + 1; |
| } |
| return 0; |
| } |
| |
| @Override |
| protected void toBytes() { |
| byte[] bytes = new byte[encodingBodyLength()]; |
| byte[] body = getValue(); |
| if (body != null) { |
| bytes[0] = (byte) padding; |
| System.arraycopy(body, 0, bytes, 1, bytes.length - 1); |
| } |
| setBytes(bytes); |
| } |
| |
| @Override |
| protected void toValue() throws IOException { |
| byte[] bytes = getBytes(); |
| if (bytes.length < 1) { |
| throw new IOException("Bad stream, zero bytes found for bitstring"); |
| } |
| int paddingBits = bytes[0]; |
| validatePaddingBits(paddingBits); |
| setPadding(paddingBits); |
| |
| byte[] newBytes = new byte[bytes.length - 1]; |
| if (bytes.length > 1) { |
| System.arraycopy(bytes, 1, newBytes, 0, bytes.length - 1); |
| } |
| setValue(newBytes); |
| } |
| |
| private void validatePaddingBits(int paddingBits) throws IOException { |
| if (paddingBits < 0 || paddingBits > 7) { |
| throw new IOException("Bad padding number: " + paddingBits + ", should be in [0, 7]"); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| String typeStr = tag().typeStr() + " [" |
| + "tag=" + tag() |
| + ", len=" + getHeaderLength() + "+" + getBodyLength() |
| + "] "; |
| |
| byte[] valueBytes = getValue(); |
| String valueStr = "<null>"; |
| if (valueBytes != null) { |
| valueStr = "<" + valueBytes.length + " bytes>"; |
| } |
| |
| return typeStr + valueStr; |
| } |
| } |