| /* |
| * 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.directory.shared.asn1.util; |
| |
| |
| import java.io.UnsupportedEncodingException; |
| |
| |
| /** |
| * Little helper class for the asn1 package. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public final class Asn1StringUtils |
| { |
| /** Hex chars */ |
| private static final byte[] HEX_CHAR = new byte[] |
| { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; |
| |
| /** |
| * The empty byte[] |
| */ |
| public static final byte[] EMPTY_BYTES = new byte[0]; |
| |
| |
| /** |
| * Helper function that dump a byte in hex form |
| * |
| * @param octet The byte to dump |
| * @return A string representation of the byte |
| */ |
| public static String dumpByte( byte octet ) |
| { |
| return new String( new byte[] |
| { '0', 'x', HEX_CHAR[( octet & 0x00F0 ) >> 4], HEX_CHAR[octet & 0x000F] } ); |
| } |
| |
| |
| /** |
| * Helper function that dump an array of bytes in hex form |
| * |
| * @param buffer The bytes array to dump |
| * @return A string representation of the array of bytes |
| */ |
| public static String dumpBytes( byte[] buffer ) |
| { |
| if ( buffer == null ) |
| { |
| return ""; |
| } |
| |
| StringBuffer sb = new StringBuffer(); |
| |
| for ( byte b : buffer ) |
| { |
| sb.append( "0x" ).append( ( char ) ( HEX_CHAR[( b & 0x00F0 ) >> 4] ) ).append( |
| ( char ) ( HEX_CHAR[b & 0x000F] ) ).append( " " ); |
| } |
| |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * Return UTF-8 encoded byte[] representation of a String |
| * |
| * @param string The string to be transformed to a byte array |
| * @return The transformed byte array |
| */ |
| public static byte[] getBytesUtf8( String string ) |
| { |
| if ( string == null ) |
| { |
| return EMPTY_BYTES; |
| } |
| |
| try |
| { |
| return string.getBytes( "UTF-8" ); |
| } |
| catch ( UnsupportedEncodingException uee ) |
| { |
| return EMPTY_BYTES; |
| } |
| } |
| |
| |
| /** |
| * Transform a string to an array of ASCII bytes, where the byte array will contain |
| * only values in [0, 127]. |
| * |
| * @param string The byte array to transform |
| * @return The resulting string |
| */ |
| public static byte[] asciiStringToByte( String string ) |
| { |
| if ( ( string == null ) || ( string.length() == 0 ) ) |
| { |
| return EMPTY_BYTES; |
| } |
| |
| byte[] result = new byte[string.length()]; |
| |
| for ( int i = 0; i < result.length; i++ ) |
| { |
| result[i] = ( byte ) string.charAt( i ); |
| } |
| |
| return result; |
| } |
| } |