1 /* 2 * Copyright (c) 2013, 2018, 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 java.util.zip; 27 28 import java.nio.Buffer; 29 import java.nio.ByteBuffer; 30 import java.nio.file.attribute.FileTime; 31 import java.security.AccessController; 32 import java.security.PrivilegedAction; 33 import java.time.DateTimeException; 34 import java.time.Instant; 35 import java.time.LocalDateTime; 36 import java.time.ZoneId; 37 import java.util.Date; 38 import java.util.concurrent.TimeUnit; 39 40 import static java.util.zip.ZipConstants.ENDHDR; 41 42 import jdk.internal.misc.Unsafe; 43 import sun.nio.ch.DirectBuffer; 44 45 class ZipUtils { 46 47 // used to adjust values between Windows and java epoch 48 private static final long WINDOWS_EPOCH_IN_MICROSECONDS = -11644473600000000L; 49 50 // used to indicate the corresponding windows time is not available 51 public static final long WINDOWS_TIME_NOT_AVAILABLE = Long.MIN_VALUE; 52 53 // static final ByteBuffer defaultBuf = ByteBuffer.allocateDirect(0); 54 static final ByteBuffer defaultBuf = ByteBuffer.allocate(0); 55 56 /** 57 * Converts Windows time (in microseconds, UTC/GMT) time to FileTime. 58 */ 59 public static final FileTime winTimeToFileTime(long wtime) { 60 return FileTime.from(wtime / 10 + WINDOWS_EPOCH_IN_MICROSECONDS, 61 TimeUnit.MICROSECONDS); 62 } 63 64 /** 65 * Converts FileTime to Windows time. 66 */ 67 public static final long fileTimeToWinTime(FileTime ftime) { 68 return (ftime.to(TimeUnit.MICROSECONDS) - WINDOWS_EPOCH_IN_MICROSECONDS) * 10; 69 } 70 71 /** 72 * The upper bound of the 32-bit unix time, the "year 2038 problem". 73 */ 74 public static final long UPPER_UNIXTIME_BOUND = 0x7fffffff; 75 76 /** 77 * Converts "standard Unix time"(in seconds, UTC/GMT) to FileTime 78 */ 79 public static final FileTime unixTimeToFileTime(long utime) { 80 return FileTime.from(utime, TimeUnit.SECONDS); 81 } 82 83 /** 84 * Converts FileTime to "standard Unix time". 85 */ 86 public static final long fileTimeToUnixTime(FileTime ftime) { 87 return ftime.to(TimeUnit.SECONDS); 88 } 89 90 /** 91 * Converts DOS time to Java time (number of milliseconds since epoch). 92 */ 93 public static long dosToJavaTime(long dtime) { 94 int year = (int) (((dtime >> 25) & 0x7f) + 1980); 95 int month = (int) ((dtime >> 21) & 0x0f); 96 int day = (int) ((dtime >> 16) & 0x1f); 97 int hour = (int) ((dtime >> 11) & 0x1f); 98 int minute = (int) ((dtime >> 5) & 0x3f); 99 int second = (int) ((dtime << 1) & 0x3e); 100 101 if (month > 0 && month < 13 && day > 0 && hour < 24 && minute < 60 && second < 60) { 102 try { 103 LocalDateTime ldt = LocalDateTime.of(year, month, day, hour, minute, second); 104 return TimeUnit.MILLISECONDS.convert(ldt.toEpochSecond( 105 ZoneId.systemDefault().getRules().getOffset(ldt)), TimeUnit.SECONDS); 106 } catch (DateTimeException dte) { 107 // ignore 108 } 109 } 110 return overflowDosToJavaTime(year, month, day, hour, minute, second); 111 } 112 113 /* 114 * Deal with corner cases where an arguably mal-formed DOS time is used 115 */ 116 @SuppressWarnings("deprecation") // Use of Date constructor 117 private static long overflowDosToJavaTime(int year, int month, int day, 118 int hour, int minute, int second) { 119 return new Date(year - 1900, month - 1, day, hour, minute, second).getTime(); 120 } 121 122 123 /** 124 * Converts extended DOS time to Java time, where up to 1999 milliseconds 125 * might be encoded into the upper half of the returned long. 126 * 127 * @param xdostime the extended DOS time value 128 * @return milliseconds since epoch 129 */ 130 public static long extendedDosToJavaTime(long xdostime) { 131 long time = dosToJavaTime(xdostime); 132 return time + (xdostime >> 32); 133 } 134 135 /** 136 * Converts Java time to DOS time. 137 */ 138 private static long javaToDosTime(long time) { 139 Instant instant = Instant.ofEpochMilli(time); 140 LocalDateTime ldt = LocalDateTime.ofInstant( 141 instant, ZoneId.systemDefault()); 142 int year = ldt.getYear() - 1980; 143 if (year < 0) { 144 return (1 << 21) | (1 << 16); 145 } 146 return (year << 25 | 147 ldt.getMonthValue() << 21 | 148 ldt.getDayOfMonth() << 16 | 149 ldt.getHour() << 11 | 150 ldt.getMinute() << 5 | 151 ldt.getSecond() >> 1) & 0xffffffffL; 152 } 153 154 /** 155 * Converts Java time to DOS time, encoding any milliseconds lost 156 * in the conversion into the upper half of the returned long. 157 * 158 * @param time milliseconds since epoch 159 * @return DOS time with 2s remainder encoded into upper half 160 */ 161 public static long javaToExtendedDosTime(long time) { 162 if (time < 0) { 163 return ZipEntry.DOSTIME_BEFORE_1980; 164 } 165 long dostime = javaToDosTime(time); 166 return (dostime != ZipEntry.DOSTIME_BEFORE_1980) 167 ? dostime + ((time % 2000) << 32) 168 : ZipEntry.DOSTIME_BEFORE_1980; 169 } 170 171 /** 172 * Fetches unsigned 16-bit value from byte array at specified offset. 173 * The bytes are assumed to be in Intel (little-endian) byte order. 174 */ 175 public static final int get16(byte b[], int off) { 176 return (b[off] & 0xff) | ((b[off + 1] & 0xff) << 8); 177 } 178 179 /** 180 * Fetches unsigned 32-bit value from byte array at specified offset. 181 * The bytes are assumed to be in Intel (little-endian) byte order. 182 */ 183 public static final long get32(byte b[], int off) { 184 return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL; 185 } 186 187 /** 188 * Fetches signed 64-bit value from byte array at specified offset. 189 * The bytes are assumed to be in Intel (little-endian) byte order. 190 */ 191 public static final long get64(byte b[], int off) { 192 return get32(b, off) | (get32(b, off+4) << 32); 193 } 194 195 /** 196 * Fetches signed 32-bit value from byte array at specified offset. 197 * The bytes are assumed to be in Intel (little-endian) byte order. 198 * 199 */ 200 public static final int get32S(byte b[], int off) { 201 return (get16(b, off) | (get16(b, off+2) << 16)); 202 } 203 204 // fields access methods 205 static final int CH(byte[] b, int n) { 206 return b[n] & 0xff ; 207 } 208 209 static final int SH(byte[] b, int n) { 210 return (b[n] & 0xff) | ((b[n + 1] & 0xff) << 8); 211 } 212 213 static final long LG(byte[] b, int n) { 214 return ((SH(b, n)) | (SH(b, n + 2) << 16)) & 0xffffffffL; 215 } 216 217 static final long LL(byte[] b, int n) { 218 return (LG(b, n)) | (LG(b, n + 4) << 32); 219 } 220 221 static final long GETSIG(byte[] b) { 222 return LG(b, 0); 223 } 224 225 // local file (LOC) header fields 226 static final long LOCSIG(byte[] b) { return LG(b, 0); } // signature 227 static final int LOCVER(byte[] b) { return SH(b, 4); } // version needed to extract 228 static final int LOCFLG(byte[] b) { return SH(b, 6); } // general purpose bit flags 229 static final int LOCHOW(byte[] b) { return SH(b, 8); } // compression method 230 static final long LOCTIM(byte[] b) { return LG(b, 10);} // modification time 231 static final long LOCCRC(byte[] b) { return LG(b, 14);} // crc of uncompressed data 232 static final long LOCSIZ(byte[] b) { return LG(b, 18);} // compressed data size 233 static final long LOCLEN(byte[] b) { return LG(b, 22);} // uncompressed data size 234 static final int LOCNAM(byte[] b) { return SH(b, 26);} // filename length 235 static final int LOCEXT(byte[] b) { return SH(b, 28);} // extra field length 236 237 // extra local (EXT) header fields 238 static final long EXTCRC(byte[] b) { return LG(b, 4);} // crc of uncompressed data 239 static final long EXTSIZ(byte[] b) { return LG(b, 8);} // compressed size 240 static final long EXTLEN(byte[] b) { return LG(b, 12);} // uncompressed size 241 242 // end of central directory header (END) fields 243 static final int ENDSUB(byte[] b) { return SH(b, 8); } // number of entries on this disk 244 static final int ENDTOT(byte[] b) { return SH(b, 10);} // total number of entries 245 static final long ENDSIZ(byte[] b) { return LG(b, 12);} // central directory size 246 static final long ENDOFF(byte[] b) { return LG(b, 16);} // central directory offset 247 static final int ENDCOM(byte[] b) { return SH(b, 20);} // size of zip file comment 248 static final int ENDCOM(byte[] b, int off) { return SH(b, off + 20);} 249 250 // zip64 end of central directory recoder fields 251 static final long ZIP64_ENDTOD(byte[] b) { return LL(b, 24);} // total number of entries on disk 252 static final long ZIP64_ENDTOT(byte[] b) { return LL(b, 32);} // total number of entries 253 static final long ZIP64_ENDSIZ(byte[] b) { return LL(b, 40);} // central directory size 254 static final long ZIP64_ENDOFF(byte[] b) { return LL(b, 48);} // central directory offset 255 static final long ZIP64_LOCOFF(byte[] b) { return LL(b, 8);} // zip64 end offset 256 257 // central directory header (CEN) fields 258 static final long CENSIG(byte[] b, int pos) { return LG(b, pos + 0); } 259 static final int CENVEM(byte[] b, int pos) { return SH(b, pos + 4); } 260 static final int CENVER(byte[] b, int pos) { return SH(b, pos + 6); } 261 static final int CENFLG(byte[] b, int pos) { return SH(b, pos + 8); } 262 static final int CENHOW(byte[] b, int pos) { return SH(b, pos + 10);} 263 static final long CENTIM(byte[] b, int pos) { return LG(b, pos + 12);} 264 static final long CENCRC(byte[] b, int pos) { return LG(b, pos + 16);} 265 static final long CENSIZ(byte[] b, int pos) { return LG(b, pos + 20);} 266 static final long CENLEN(byte[] b, int pos) { return LG(b, pos + 24);} 267 static final int CENNAM(byte[] b, int pos) { return SH(b, pos + 28);} 268 static final int CENEXT(byte[] b, int pos) { return SH(b, pos + 30);} 269 static final int CENCOM(byte[] b, int pos) { return SH(b, pos + 32);} 270 static final int CENDSK(byte[] b, int pos) { return SH(b, pos + 34);} 271 static final int CENATT(byte[] b, int pos) { return SH(b, pos + 36);} 272 static final long CENATX(byte[] b, int pos) { return LG(b, pos + 38);} 273 static final long CENOFF(byte[] b, int pos) { return LG(b, pos + 42);} 274 275 // The END header is followed by a variable length comment of size < 64k. 276 static final long END_MAXLEN = 0xFFFF + ENDHDR; 277 static final int READBLOCKSZ = 128; 278 279 /** 280 * Loads zip native library, if not already laoded 281 */ 282 static void loadLibrary() { 283 SecurityManager sm = System.getSecurityManager(); 284 if (sm == null) { 285 System.loadLibrary("zip"); 286 } else { 287 PrivilegedAction<Void> pa = () -> { System.loadLibrary("zip"); return null; }; 288 AccessController.doPrivileged(pa); 289 } 290 } 291 292 private static final Unsafe unsafe = Unsafe.getUnsafe(); 293 294 private static final long byteBufferArrayOffset = unsafe.objectFieldOffset(ByteBuffer.class, "hb"); 295 private static final long byteBufferOffsetOffset = unsafe.objectFieldOffset(ByteBuffer.class, "offset"); 296 297 static byte[] getBufferArray(ByteBuffer byteBuffer) { 298 return (byte[]) unsafe.getObject(byteBuffer, byteBufferArrayOffset); 299 } 300 301 static int getBufferOffset(ByteBuffer byteBuffer) { 302 return unsafe.getInt(byteBuffer, byteBufferOffsetOffset); 303 } 304 }