1 /* 2 * Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.nio.fs; 27 28 import java.nio.file.Path; 29 import java.io.File; 30 import java.net.URI; 31 import java.net.URISyntaxException; 32 import java.util.Arrays; 33 34 /** 35 * Unix specific Path <--> URI conversion 36 */ 37 38 class UnixUriUtils { UnixUriUtils()39 private UnixUriUtils() { } 40 41 /** 42 * Converts URI to Path 43 */ fromUri(UnixFileSystem fs, URI uri)44 static Path fromUri(UnixFileSystem fs, URI uri) { 45 if (!uri.isAbsolute()) 46 throw new IllegalArgumentException("URI is not absolute"); 47 if (uri.isOpaque()) 48 throw new IllegalArgumentException("URI is not hierarchical"); 49 String scheme = uri.getScheme(); 50 if ((scheme == null) || !scheme.equalsIgnoreCase("file")) 51 throw new IllegalArgumentException("URI scheme is not \"file\""); 52 if (uri.getRawAuthority() != null) 53 throw new IllegalArgumentException("URI has an authority component"); 54 if (uri.getRawFragment() != null) 55 throw new IllegalArgumentException("URI has a fragment component"); 56 if (uri.getRawQuery() != null) 57 throw new IllegalArgumentException("URI has a query component"); 58 59 // compatibility with java.io.File 60 if (!uri.toString().startsWith("file:///")) 61 return new File(uri).toPath(); 62 63 // transformation use raw path 64 String p = uri.getRawPath(); 65 int len = p.length(); 66 if (len == 0) 67 throw new IllegalArgumentException("URI path component is empty"); 68 69 // transform escaped octets and unescaped characters to bytes 70 if (p.endsWith("/") && len > 1) 71 len--; 72 byte[] result = new byte[len]; 73 int rlen = 0; 74 int pos = 0; 75 while (pos < len) { 76 char c = p.charAt(pos++); 77 byte b; 78 if (c == '%') { 79 assert (pos+2) <= len; 80 char c1 = p.charAt(pos++); 81 char c2 = p.charAt(pos++); 82 b = (byte)((decode(c1) << 4) | decode(c2)); 83 if (b == 0) 84 throw new IllegalArgumentException("Nul character not allowed"); 85 } else { 86 if (c == 0 || c >= 0x80) 87 throw new IllegalArgumentException("Bad escape"); 88 b = (byte)c; 89 } 90 result[rlen++] = b; 91 } 92 if (rlen != result.length) 93 result = Arrays.copyOf(result, rlen); 94 95 return new UnixPath(fs, result); 96 } 97 98 /** 99 * Converts Path to URI 100 */ toUri(UnixPath up)101 static URI toUri(UnixPath up) { 102 byte[] path = up.toAbsolutePath().asByteArray(); 103 StringBuilder sb = new StringBuilder("file:///"); 104 assert path[0] == '/'; 105 for (int i=1; i<path.length; i++) { 106 char c = (char)(path[i] & 0xff); 107 if (match(c, L_PATH, H_PATH)) { 108 sb.append(c); 109 } else { 110 sb.append('%'); 111 sb.append(hexDigits[(c >> 4) & 0x0f]); 112 sb.append(hexDigits[(c) & 0x0f]); 113 } 114 } 115 116 // trailing slash if directory 117 if (sb.charAt(sb.length()-1) != '/') { 118 try { 119 up.checkRead(); 120 int mode = UnixNativeDispatcher.stat(up); 121 if ((mode & UnixConstants.S_IFMT) == UnixConstants.S_IFDIR) 122 sb.append('/'); 123 } catch (SecurityException ignore) { } 124 } 125 126 try { 127 return new URI(sb.toString()); 128 } catch (URISyntaxException x) { 129 throw new AssertionError(x); // should not happen 130 } 131 } 132 133 // The following is copied from java.net.URI 134 135 // Compute the low-order mask for the characters in the given string lowMask(String chars)136 private static long lowMask(String chars) { 137 int n = chars.length(); 138 long m = 0; 139 for (int i = 0; i < n; i++) { 140 char c = chars.charAt(i); 141 if (c < 64) 142 m |= (1L << c); 143 } 144 return m; 145 } 146 147 // Compute the high-order mask for the characters in the given string highMask(String chars)148 private static long highMask(String chars) { 149 int n = chars.length(); 150 long m = 0; 151 for (int i = 0; i < n; i++) { 152 char c = chars.charAt(i); 153 if ((c >= 64) && (c < 128)) 154 m |= (1L << (c - 64)); 155 } 156 return m; 157 } 158 159 // Compute a low-order mask for the characters 160 // between first and last, inclusive lowMask(char first, char last)161 private static long lowMask(char first, char last) { 162 long m = 0; 163 int f = Math.max(Math.min(first, 63), 0); 164 int l = Math.max(Math.min(last, 63), 0); 165 for (int i = f; i <= l; i++) 166 m |= 1L << i; 167 return m; 168 } 169 170 // Compute a high-order mask for the characters 171 // between first and last, inclusive highMask(char first, char last)172 private static long highMask(char first, char last) { 173 long m = 0; 174 int f = Math.max(Math.min(first, 127), 64) - 64; 175 int l = Math.max(Math.min(last, 127), 64) - 64; 176 for (int i = f; i <= l; i++) 177 m |= 1L << i; 178 return m; 179 } 180 181 // Tell whether the given character is permitted by the given mask pair match(char c, long lowMask, long highMask)182 private static boolean match(char c, long lowMask, long highMask) { 183 if (c < 64) 184 return ((1L << c) & lowMask) != 0; 185 if (c < 128) 186 return ((1L << (c - 64)) & highMask) != 0; 187 return false; 188 } 189 190 // decode decode(char c)191 private static int decode(char c) { 192 if ((c >= '0') && (c <= '9')) 193 return c - '0'; 194 if ((c >= 'a') && (c <= 'f')) 195 return c - 'a' + 10; 196 if ((c >= 'A') && (c <= 'F')) 197 return c - 'A' + 10; 198 throw new AssertionError(); 199 } 200 201 // digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | 202 // "8" | "9" 203 private static final long L_DIGIT = lowMask('0', '9'); 204 private static final long H_DIGIT = 0L; 205 206 // upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | 207 // "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | 208 // "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z" 209 private static final long L_UPALPHA = 0L; 210 private static final long H_UPALPHA = highMask('A', 'Z'); 211 212 // lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | 213 // "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | 214 // "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z" 215 private static final long L_LOWALPHA = 0L; 216 private static final long H_LOWALPHA = highMask('a', 'z'); 217 218 // alpha = lowalpha | upalpha 219 private static final long L_ALPHA = L_LOWALPHA | L_UPALPHA; 220 private static final long H_ALPHA = H_LOWALPHA | H_UPALPHA; 221 222 // alphanum = alpha | digit 223 private static final long L_ALPHANUM = L_DIGIT | L_ALPHA; 224 private static final long H_ALPHANUM = H_DIGIT | H_ALPHA; 225 226 // mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | 227 // "(" | ")" 228 private static final long L_MARK = lowMask("-_.!~*'()"); 229 private static final long H_MARK = highMask("-_.!~*'()"); 230 231 // unreserved = alphanum | mark 232 private static final long L_UNRESERVED = L_ALPHANUM | L_MARK; 233 private static final long H_UNRESERVED = H_ALPHANUM | H_MARK; 234 235 // pchar = unreserved | escaped | 236 // ":" | "@" | "&" | "=" | "+" | "$" | "," 237 private static final long L_PCHAR 238 = L_UNRESERVED | lowMask(":@&=+$,"); 239 private static final long H_PCHAR 240 = H_UNRESERVED | highMask(":@&=+$,"); 241 242 // All valid path characters 243 private static final long L_PATH = L_PCHAR | lowMask(";/"); 244 private static final long H_PATH = H_PCHAR | highMask(";/"); 245 246 private static final char[] hexDigits = { 247 '0', '1', '2', '3', '4', '5', '6', '7', 248 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' 249 }; 250 } 251