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20 package org.apache.directory.api.asn1.util;
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23 import java.nio.charset.StandardCharsets;
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31 public final class Asn1StringUtils
32 {
33
34 private static final byte[] HEX_CHAR = new byte[]
35 { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
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40 public static final byte[] EMPTY_BYTES = new byte[]
41 {};
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43
44 private Asn1StringUtils()
45 {
46 }
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54 public static String dumpByte( byte octet )
55 {
56 return new String( new byte[]
57 { '0', 'x', HEX_CHAR[( octet & 0x00F0 ) >> 4], HEX_CHAR[octet & 0x000F] }, StandardCharsets.UTF_8 );
58 }
59
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65
66
67 public static String dumpBytes( byte[] buffer )
68 {
69 if ( buffer == null )
70 {
71 return "";
72 }
73
74 StringBuilder sb = new StringBuilder();
75
76 for ( byte b : buffer )
77 {
78 sb.append( "0x" ).append( ( char ) ( HEX_CHAR[( b & 0x00F0 ) >> 4] ) ).append(
79 ( char ) ( HEX_CHAR[b & 0x000F] ) ).append( " " );
80 }
81
82 return sb.toString();
83 }
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94 public static String dumpBytes( byte[] buffer, int start, int length )
95 {
96 if ( buffer == null )
97 {
98 return "";
99 }
100
101 StringBuilder sb = new StringBuilder();
102
103 for ( int i = start; i < start + length; i++ )
104 {
105 byte b = buffer[i];
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107 sb.append( "0x" ).append( ( char ) ( HEX_CHAR[( b & 0x00F0 ) >> 4] ) ).append(
108 ( char ) ( HEX_CHAR[b & 0x000F] ) ).append( " " );
109 }
110
111 return sb.toString();
112 }
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120
121 public static byte[] getBytesUtf8( String string )
122 {
123 if ( string == null )
124 {
125 return EMPTY_BYTES;
126 }
127
128 return string.getBytes( StandardCharsets.UTF_8 );
129 }
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139 public static byte[] asciiStringToByte( String string )
140 {
141 if ( ( string == null ) || ( string.length() == 0 ) )
142 {
143 return EMPTY_BYTES;
144 }
145
146 byte[] result = new byte[string.length()];
147
148 for ( int i = 0; i < result.length; i++ )
149 {
150 result[i] = ( byte ) string.charAt( i );
151 }
152
153 return result;
154 }
155 }