1 /*
2 * Copyright (c) 2013, 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.file.attribute.FileTime;
29 import java.util.Date;
30 import java.util.concurrent.TimeUnit;
31
32 import static java.util.zip.ZipConstants.*;
33 import static java.util.zip.ZipConstants64.*;
34
35 class ZipUtils {
36
37 // used to adjust values between Windows and java epoch
38 private static final long WINDOWS_EPOCH_IN_MICROSECONDS = -11644473600000000L;
39
40 /**
41 * Converts Windows time (in microseconds, UTC/GMT) time to FileTime.
42 */
43 public static final FileTime winTimeToFileTime(long wtime) {
44 return FileTime.from(wtime / 10 + WINDOWS_EPOCH_IN_MICROSECONDS,
45 TimeUnit.MICROSECONDS);
46 }
47
48 /**
49 * Converts FileTime to Windows time.
50 */
51 public static final long fileTimeToWinTime(FileTime ftime) {
52 return (ftime.to(TimeUnit.MICROSECONDS) - WINDOWS_EPOCH_IN_MICROSECONDS) * 10;
53 }
54
55 /**
56 * Converts "standard Unix time"(in seconds, UTC/GMT) to FileTime
57 */
58 public static final FileTime unixTimeToFileTime(long utime) {
59 return FileTime.from(utime, TimeUnit.SECONDS);
60 }
61
62 /**
63 * Converts FileTime to "standard Unix time".
64 */
65 public static final long fileTimeToUnixTime(FileTime ftime) {
66 return ftime.to(TimeUnit.SECONDS);
67 }
68
69 /**
70 * Converts DOS time to Java time (number of milliseconds since epoch).
71 */
72 public static long dosToJavaTime(long dtime) {
73 @SuppressWarnings("deprecation") // Use of date constructor.
74 Date d = new Date((int)(((dtime >> 25) & 0x7f) + 80),
75 (int)(((dtime >> 21) & 0x0f) - 1),
76 (int)((dtime >> 16) & 0x1f),
77 (int)((dtime >> 11) & 0x1f),
78 (int)((dtime >> 5) & 0x3f),
79 (int)((dtime << 1) & 0x3e));
80 return d.getTime();
81 }
82
83 /**
84 * Converts Java time to DOS time.
85 */
86 @SuppressWarnings("deprecation") // Use of date methods
87 public static long javaToDosTime(long time) {
88 Date d = new Date(time);
89 int year = d.getYear() + 1900;
90 if (year < 1980) {
91 return (1 << 21) | (1 << 16);
92 }
93 return (year - 1980) << 25 | (d.getMonth() + 1) << 21 |
94 d.getDate() << 16 | d.getHours() << 11 | d.getMinutes() << 5 |
95 d.getSeconds() >> 1;
96 }
97
98 /**
99 * Fetches unsigned 16-bit value from byte array at specified offset.
100 * The bytes are assumed to be in Intel (little-endian) byte order.
101 */
102 public static final int get16(byte b[], int off) {
103 return Byte.toUnsignedInt(b[off]) | (Byte.toUnsignedInt(b[off+1]) << 8);
104 }
105
106 /**
107 * Fetches unsigned 32-bit value from byte array at specified offset.
108 * The bytes are assumed to be in Intel (little-endian) byte order.
109 */
110 public static final long get32(byte b[], int off) {
111 return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL;
112 }
113
114 /**
115 * Fetches signed 64-bit value from byte array at specified offset.
116 * The bytes are assumed to be in Intel (little-endian) byte order.
117 */
118 public static final long get64(byte b[], int off) {
119 return get32(b, off) | (get32(b, off+4) << 32);
120 }
121 }