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1 /* |
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2 * Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package jdk.nio.zipfs; |
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27 |
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28 import java.nio.ByteBuffer; |
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29 import java.nio.CharBuffer; |
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30 import java.nio.charset.Charset; |
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31 import java.nio.charset.CharsetDecoder; |
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32 import java.nio.charset.CharsetEncoder; |
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33 import java.nio.charset.CoderResult; |
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34 import java.nio.charset.CodingErrorAction; |
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35 import java.util.Arrays; |
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36 |
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37 import static java.nio.charset.StandardCharsets.UTF_8; |
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38 import static java.nio.charset.StandardCharsets.ISO_8859_1; |
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39 |
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40 /** |
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41 * Utility class for zipfile name and comment decoding and encoding |
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42 * |
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43 * @author Xueming Shen |
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44 */ |
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45 |
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46 class ZipCoder { |
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47 |
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48 static class UTF8 extends ZipCoder { |
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49 UTF8() { |
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50 super(UTF_8); |
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51 } |
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52 |
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53 @Override |
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54 byte[] getBytes(String s) { // fast pass for ascii |
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55 for (int i = 0; i < s.length(); i++) { |
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56 if (s.charAt(i) > 0x7f) return super.getBytes(s); |
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57 } |
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58 return s.getBytes(ISO_8859_1); |
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59 } |
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60 |
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61 @Override |
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62 String toString(byte[] ba) { |
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63 for (byte b : ba) { |
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64 if (b < 0) return super.toString(ba); |
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65 } |
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66 return new String(ba, ISO_8859_1); |
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67 } |
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68 } |
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69 |
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70 private static final ZipCoder utf8 = new UTF8(); |
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71 |
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72 public static ZipCoder get(String csn) { |
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73 Charset cs = Charset.forName(csn); |
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74 if (cs.name().equals("UTF-8")) { |
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75 return utf8; |
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76 } |
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77 return new ZipCoder(cs); |
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78 } |
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79 |
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80 String toString(byte[] ba) { |
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81 CharsetDecoder cd = decoder().reset(); |
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82 int clen = (int)(ba.length * cd.maxCharsPerByte()); |
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83 char[] ca = new char[clen]; |
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84 if (clen == 0) |
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85 return new String(ca); |
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86 ByteBuffer bb = ByteBuffer.wrap(ba, 0, ba.length); |
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87 CharBuffer cb = CharBuffer.wrap(ca); |
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88 CoderResult cr = cd.decode(bb, cb, true); |
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89 if (!cr.isUnderflow()) |
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90 throw new IllegalArgumentException(cr.toString()); |
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91 cr = cd.flush(cb); |
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92 if (!cr.isUnderflow()) |
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93 throw new IllegalArgumentException(cr.toString()); |
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94 return new String(ca, 0, cb.position()); |
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95 } |
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96 |
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97 byte[] getBytes(String s) { |
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98 CharsetEncoder ce = encoder().reset(); |
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99 char[] ca = s.toCharArray(); |
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100 int len = (int)(ca.length * ce.maxBytesPerChar()); |
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101 byte[] ba = new byte[len]; |
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102 if (len == 0) |
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103 return ba; |
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104 ByteBuffer bb = ByteBuffer.wrap(ba); |
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105 CharBuffer cb = CharBuffer.wrap(ca); |
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106 CoderResult cr = ce.encode(cb, bb, true); |
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107 if (!cr.isUnderflow()) |
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108 throw new IllegalArgumentException(cr.toString()); |
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109 cr = ce.flush(bb); |
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110 if (!cr.isUnderflow()) |
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111 throw new IllegalArgumentException(cr.toString()); |
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112 if (bb.position() == ba.length) // defensive copy? |
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113 return ba; |
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114 else |
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115 return Arrays.copyOf(ba, bb.position()); |
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116 } |
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117 |
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118 boolean isUTF8() { |
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119 return cs == UTF_8; |
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120 } |
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121 |
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122 private Charset cs; |
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123 |
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124 private ZipCoder(Charset cs) { |
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125 this.cs = cs; |
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126 } |
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127 |
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128 private final ThreadLocal<CharsetDecoder> decTL = new ThreadLocal<>(); |
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129 private final ThreadLocal<CharsetEncoder> encTL = new ThreadLocal<>(); |
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130 |
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131 private CharsetDecoder decoder() { |
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132 CharsetDecoder dec = decTL.get(); |
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133 if (dec == null) { |
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134 dec = cs.newDecoder() |
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135 .onMalformedInput(CodingErrorAction.REPORT) |
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136 .onUnmappableCharacter(CodingErrorAction.REPORT); |
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137 decTL.set(dec); |
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138 } |
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139 return dec; |
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140 } |
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141 |
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142 private CharsetEncoder encoder() { |
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143 CharsetEncoder enc = encTL.get(); |
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144 if (enc == null) { |
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145 enc = cs.newEncoder() |
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146 .onMalformedInput(CodingErrorAction.REPORT) |
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147 .onUnmappableCharacter(CodingErrorAction.REPORT); |
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148 encTL.set(enc); |
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149 } |
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150 return enc; |
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151 } |
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152 } |