1 /*
2 * Copyright (c) 2009, 2014, 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 jdk.nio.zipfs;
27
28 /**
29 *
30 * @author Xueming Shen
31 */
32
33 class ZipConstants {
34 /*
35 * Compression methods
36 */
37 static final int METHOD_STORED = 0;
38 static final int METHOD_DEFLATED = 8;
39 static final int METHOD_DEFLATED64 = 9;
40 static final int METHOD_BZIP2 = 12;
41 static final int METHOD_LZMA = 14;
42 static final int METHOD_LZ77 = 19;
43 static final int METHOD_AES = 99;
44
45 /*
46 * General purpose big flag
47 */
48 static final int FLAG_ENCRYPTED = 0x01;
49 static final int FLAG_DATADESCR = 0x08; // crc, size and csize in dd
50 static final int FLAG_EFS = 0x800; // If this bit is set the filename and
51 // comment fields for this file must be
52 // encoded using UTF-8.
53 /*
54 * Header signatures
55 */
56 static long LOCSIG = 0x04034b50L; // "PK\003\004"
57 static long EXTSIG = 0x08074b50L; // "PK\007\008"
58 static long CENSIG = 0x02014b50L; // "PK\001\002"
59 static long ENDSIG = 0x06054b50L; // "PK\005\006"
60
61 /*
62 * Header sizes in bytes (including signatures)
63 */
64 static final int LOCHDR = 30; // LOC header size
65 static final int EXTHDR = 16; // EXT header size
66 static final int CENHDR = 46; // CEN header size
67 static final int ENDHDR = 22; // END header size
68
69 /*
70 * Local file (LOC) header field offsets
71 */
72 static final int LOCVER = 4; // version needed to extract
73 static final int LOCFLG = 6; // general purpose bit flag
74 static final int LOCHOW = 8; // compression method
75 static final int LOCTIM = 10; // modification time
76 static final int LOCCRC = 14; // uncompressed file crc-32 value
77 static final int LOCSIZ = 18; // compressed size
78 static final int LOCLEN = 22; // uncompressed size
79 static final int LOCNAM = 26; // filename length
80 static final int LOCEXT = 28; // extra field length
81
82 /*
83 * Extra local (EXT) header field offsets
84 */
85 static final int EXTCRC = 4; // uncompressed file crc-32 value
86 static final int EXTSIZ = 8; // compressed size
87 static final int EXTLEN = 12; // uncompressed size
88
89 /*
90 * Central directory (CEN) header field offsets
91 */
92 static final int CENVEM = 4; // version made by
93 static final int CENVER = 6; // version needed to extract
94 static final int CENFLG = 8; // encrypt, decrypt flags
95 static final int CENHOW = 10; // compression method
96 static final int CENTIM = 12; // modification time
97 static final int CENCRC = 16; // uncompressed file crc-32 value
98 static final int CENSIZ = 20; // compressed size
99 static final int CENLEN = 24; // uncompressed size
100 static final int CENNAM = 28; // filename length
101 static final int CENEXT = 30; // extra field length
102 static final int CENCOM = 32; // comment length
103 static final int CENDSK = 34; // disk number start
104 static final int CENATT = 36; // internal file attributes
105 static final int CENATX = 38; // external file attributes
106 static final int CENOFF = 42; // LOC header offset
107
108 /*
109 * End of central directory (END) header field offsets
110 */
111 static final int ENDSUB = 8; // number of entries on this disk
112 static final int ENDTOT = 10; // total number of entries
113 static final int ENDSIZ = 12; // central directory size in bytes
114 static final int ENDOFF = 16; // offset of first CEN header
115 static final int ENDCOM = 20; // zip file comment length
116
117 /*
118 * ZIP64 constants
119 */
120 static final long ZIP64_ENDSIG = 0x06064b50L; // "PK\006\006"
121 static final long ZIP64_LOCSIG = 0x07064b50L; // "PK\006\007"
122 static final int ZIP64_ENDHDR = 56; // ZIP64 end header size
123 static final int ZIP64_LOCHDR = 20; // ZIP64 end loc header size
124 static final int ZIP64_EXTHDR = 24; // EXT header size
125 static final int ZIP64_EXTID = 0x0001; // Extra field Zip64 header ID
126
127 static final int ZIP64_MINVAL32 = 0xFFFF;
128 static final long ZIP64_MINVAL = 0xFFFFFFFFL;
129
130 /*
131 * Zip64 End of central directory (END) header field offsets
132 */
133 static final int ZIP64_ENDLEN = 4; // size of zip64 end of central dir
134 static final int ZIP64_ENDVEM = 12; // version made by
135 static final int ZIP64_ENDVER = 14; // version needed to extract
136 static final int ZIP64_ENDNMD = 16; // number of this disk
137 static final int ZIP64_ENDDSK = 20; // disk number of start
138 static final int ZIP64_ENDTOD = 24; // total number of entries on this disk
139 static final int ZIP64_ENDTOT = 32; // total number of entries
140 static final int ZIP64_ENDSIZ = 40; // central directory size in bytes
141 static final int ZIP64_ENDOFF = 48; // offset of first CEN header
142 static final int ZIP64_ENDEXT = 56; // zip64 extensible data sector
143
144 /*
145 * Zip64 End of central directory locator field offsets
146 */
147 static final int ZIP64_LOCDSK = 4; // disk number start
148 static final int ZIP64_LOCOFF = 8; // offset of zip64 end
149 static final int ZIP64_LOCTOT = 16; // total number of disks
150
151 /*
152 * Zip64 Extra local (EXT) header field offsets
153 */
154 static final int ZIP64_EXTCRC = 4; // uncompressed file crc-32 value
155 static final int ZIP64_EXTSIZ = 8; // compressed size, 8-byte
156 static final int ZIP64_EXTLEN = 16; // uncompressed size, 8-byte
157
158 /*
159 * Extra field header ID
160 */
161 static final int EXTID_ZIP64 = 0x0001; // ZIP64
162 static final int EXTID_NTFS = 0x000a; // NTFS
163 static final int EXTID_UNIX = 0x000d; // UNIX
164 static final int EXTID_EFS = 0x0017; // Strong Encryption
165 static final int EXTID_EXTT = 0x5455; // Info-ZIP Extended Timestamp
166
167 /*
168 * fields access methods
169 */
170 ///////////////////////////////////////////////////////
171 static final int CH(byte[] b, int n) {
172 return Byte.toUnsignedInt(b[n]);
173 }
174
175 static final int SH(byte[] b, int n) {
176 return Byte.toUnsignedInt(b[n]) | (Byte.toUnsignedInt(b[n + 1]) << 8);
177 }
178
179 static final long LG(byte[] b, int n) {
180 return ((SH(b, n)) | (SH(b, n + 2) << 16)) & 0xffffffffL;
181 }
182
183 static final long LL(byte[] b, int n) {
184 return (LG(b, n)) | (LG(b, n + 4) << 32);
185 }
186
187 static long getSig(byte[] b, int n) { return LG(b, n); }
188
189 private static boolean pkSigAt(byte[] b, int n, int b1, int b2) {
190 return b[n] == 'P' & b[n + 1] == 'K' & b[n + 2] == b1 & b[n + 3] == b2;
191 }
192
193 static boolean cenSigAt(byte[] b, int n) { return pkSigAt(b, n, 1, 2); }
194 static boolean locSigAt(byte[] b, int n) { return pkSigAt(b, n, 3, 4); }
195 static boolean endSigAt(byte[] b, int n) { return pkSigAt(b, n, 5, 6); }
196 static boolean extSigAt(byte[] b, int n) { return pkSigAt(b, n, 7, 8); }
197 static boolean end64SigAt(byte[] b, int n) { return pkSigAt(b, n, 6, 6); }
198 static boolean locator64SigAt(byte[] b, int n) { return pkSigAt(b, n, 6, 7); }
199
200 // local file (LOC) header fields
201 static final long LOCSIG(byte[] b) { return LG(b, 0); } // signature
202 static final int LOCVER(byte[] b) { return SH(b, 4); } // version needed to extract
203 static final int LOCFLG(byte[] b) { return SH(b, 6); } // general purpose bit flags
204 static final int LOCHOW(byte[] b) { return SH(b, 8); } // compression method
205 static final long LOCTIM(byte[] b) { return LG(b, 10);} // modification time
206 static final long LOCCRC(byte[] b) { return LG(b, 14);} // crc of uncompressed data
207 static final long LOCSIZ(byte[] b) { return LG(b, 18);} // compressed data size
208 static final long LOCLEN(byte[] b) { return LG(b, 22);} // uncompressed data size
209 static final int LOCNAM(byte[] b) { return SH(b, 26);} // filename length
210 static final int LOCEXT(byte[] b) { return SH(b, 28);} // extra field length
211
212 // extra local (EXT) header fields
213 static final long EXTCRC(byte[] b) { return LG(b, 4);} // crc of uncompressed data
214 static final long EXTSIZ(byte[] b) { return LG(b, 8);} // compressed size
215 static final long EXTLEN(byte[] b) { return LG(b, 12);} // uncompressed size
216
217 // end of central directory header (END) fields
218 static final int ENDSUB(byte[] b) { return SH(b, 8); } // number of entries on this disk
219 static final int ENDTOT(byte[] b) { return SH(b, 10);} // total number of entries
220 static final long ENDSIZ(byte[] b) { return LG(b, 12);} // central directory size
221 static final long ENDOFF(byte[] b) { return LG(b, 16);} // central directory offset
222 static final int ENDCOM(byte[] b) { return SH(b, 20);} // size of zip file comment
223 static final int ENDCOM(byte[] b, int off) { return SH(b, off + 20);}
224
225 // zip64 end of central directory recoder fields
226 static final long ZIP64_ENDTOD(byte[] b) { return LL(b, 24);} // total number of entries on disk
227 static final long ZIP64_ENDTOT(byte[] b) { return LL(b, 32);} // total number of entries
228 static final long ZIP64_ENDSIZ(byte[] b) { return LL(b, 40);} // central directory size
229 static final long ZIP64_ENDOFF(byte[] b) { return LL(b, 48);} // central directory offset
230 static final long ZIP64_LOCOFF(byte[] b) { return LL(b, 8);} // zip64 end offset
231
232 // central directory header (CEN) fields
233 static final long CENSIG(byte[] b, int pos) { return LG(b, pos + 0); }
234 static final int CENVEM(byte[] b, int pos) { return SH(b, pos + 4); }
235 static final int CENVER(byte[] b, int pos) { return SH(b, pos + 6); }
236 static final int CENFLG(byte[] b, int pos) { return SH(b, pos + 8); }
237 static final int CENHOW(byte[] b, int pos) { return SH(b, pos + 10);}
238 static final long CENTIM(byte[] b, int pos) { return LG(b, pos + 12);}
239 static final long CENCRC(byte[] b, int pos) { return LG(b, pos + 16);}
240 static final long CENSIZ(byte[] b, int pos) { return LG(b, pos + 20);}
241 static final long CENLEN(byte[] b, int pos) { return LG(b, pos + 24);}
242 static final int CENNAM(byte[] b, int pos) { return SH(b, pos + 28);}
243 static final int CENEXT(byte[] b, int pos) { return SH(b, pos + 30);}
244 static final int CENCOM(byte[] b, int pos) { return SH(b, pos + 32);}
245 static final int CENDSK(byte[] b, int pos) { return SH(b, pos + 34);}
246 static final int CENATT(byte[] b, int pos) { return SH(b, pos + 36);}
247 static final long CENATX(byte[] b, int pos) { return LG(b, pos + 38);}
248 static final long CENOFF(byte[] b, int pos) { return LG(b, pos + 42);}
249
250 /* The END header is followed by a variable length comment of size < 64k. */
251 static final long END_MAXLEN = 0xFFFF + ENDHDR;
252 static final int READBLOCKSZ = 128;
253 }