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