1 /*
2 * Copyright (c) 1995, 2022, 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 /*
27 * Prototypes for zip file support
28 */
29
30 #ifndef _ZIP_H_
31 #define _ZIP_H_
32
33 #include "jni.h"
34
35 /*
36 * Header signatures
37 */
38 #define PKZIP_SIGNATURE_AT(p, b2, b3) \
39 (((p)[0] == 'P') & ((p)[1] == 'K') & ((p)[2] == b2) & ((p)[3] == b3))
40 #define CENSIG_AT(p) PKZIP_SIGNATURE_AT(p, 1, 2)
41 #define LOCSIG_AT(p) PKZIP_SIGNATURE_AT(p, 3, 4)
42 #define ENDSIG_AT(p) PKZIP_SIGNATURE_AT(p, 5, 6)
43 #define EXTSIG_AT(p) PKZIP_SIGNATURE_AT(p, 7, 8)
44 #define ZIP64_ENDSIG_AT(p) PKZIP_SIGNATURE_AT(p, 6, 6)
45 #define ZIP64_LOCSIG_AT(p) PKZIP_SIGNATURE_AT(p, 6, 7)
46
47 /*
48 * Header sizes including signatures
49 */
50
51 #define LOCHDR 30
52 #define EXTHDR 16
53 #define CENHDR 46
54 #define ENDHDR 22
55
56 #define ZIP64_ENDHDR 56 // ZIP64 end header size
57 #define ZIP64_LOCHDR 20 // ZIP64 end loc header size
58 #define ZIP64_EXTHDR 24 // EXT header size
59 #define ZIP64_EXTID 1 // Extra field Zip64 header ID
60
61 #define ZIP64_MAGICVAL 0xffffffffLL
62 #define ZIP64_MAGICCOUNT 0xffff
63
64
65 /*
66 * Header field access macros
67 */
68 #define CH(b, n) (((unsigned char *)(b))[n])
69 #define SH(b, n) (CH(b, n) | (CH(b, n+1) << 8))
70 #define LG(b, n) ((SH(b, n) | (SH(b, n+2) << 16)) &0xffffffffUL)
71 #define LL(b, n) (((jlong)LG(b, n)) | (((jlong)LG(b, n+4)) << 32))
72 #define GETSIG(b) LG(b, 0)
73
74 /*
75 * Macros for getting local file (LOC) header fields
76 */
77 #define LOCVER(b) SH(b, 4) /* version needed to extract */
78 #define LOCFLG(b) SH(b, 6) /* general purpose bit flags */
79 #define LOCHOW(b) SH(b, 8) /* compression method */
80 #define LOCTIM(b) LG(b, 10) /* modification time */
81 #define LOCCRC(b) LG(b, 14) /* crc of uncompressed data */
82 #define LOCSIZ(b) LG(b, 18) /* compressed data size */
83 #define LOCLEN(b) LG(b, 22) /* uncompressed data size */
84 #define LOCNAM(b) SH(b, 26) /* filename length */
85 #define LOCEXT(b) SH(b, 28) /* extra field length */
86
87 /*
88 * Macros for getting extra local (EXT) header fields
89 */
90 #define EXTCRC(b) LG(b, 4) /* crc of uncompressed data */
91 #define EXTSIZ(b) LG(b, 8) /* compressed size */
92 #define EXTLEN(b) LG(b, 12) /* uncompressed size */
93
94 /*
95 * Macros for getting central directory header (CEN) fields
96 */
97 #define CENVEM(b) SH(b, 4) /* version made by */
98 #define CENVER(b) SH(b, 6) /* version needed to extract */
99 #define CENFLG(b) SH(b, 8) /* general purpose bit flags */
100 #define CENHOW(b) SH(b, 10) /* compression method */
101 #define CENTIM(b) LG(b, 12) /* modification time */
102 #define CENCRC(b) LG(b, 16) /* crc of uncompressed data */
103 #define CENSIZ(b) LG(b, 20) /* compressed size */
104 #define CENLEN(b) LG(b, 24) /* uncompressed size */
105 #define CENNAM(b) SH(b, 28) /* length of filename */
106 #define CENEXT(b) SH(b, 30) /* length of extra field */
107 #define CENCOM(b) SH(b, 32) /* file comment length */
108 #define CENDSK(b) SH(b, 34) /* disk number start */
109 #define CENATT(b) SH(b, 36) /* internal file attributes */
110 #define CENATX(b) LG(b, 38) /* external file attributes */
111 #define CENOFF(b) LG(b, 42) /* offset of local header */
112
113 /*
114 * Macros for getting end of central directory header (END) fields
115 */
116 #define ENDSUB(b) SH(b, 8) /* number of entries on this disk */
117 #define ENDTOT(b) SH(b, 10) /* total number of entries */
118 #define ENDSIZ(b) LG(b, 12) /* central directory size */
119 #define ENDOFF(b) LG(b, 16) /* central directory offset */
120 #define ENDCOM(b) SH(b, 20) /* size of zip file comment */
121
122 /*
123 * Macros for getting Zip64 end of central directory header fields
124 */
125 #define ZIP64_ENDLEN(b) LL(b, 4) /* size of zip64 end of central dir */
126 #define ZIP64_ENDVEM(b) SH(b, 12) /* version made by */
127 #define ZIP64_ENDVER(b) SH(b, 14) /* version needed to extract */
128 #define ZIP64_ENDNMD(b) LG(b, 16) /* number of this disk */
129 #define ZIP64_ENDDSK(b) LG(b, 20) /* disk number of start */
130 #define ZIP64_ENDTOD(b) LL(b, 24) /* total number of entries on this disk */
131 #define ZIP64_ENDTOT(b) LL(b, 32) /* total number of entries */
132 #define ZIP64_ENDSIZ(b) LL(b, 40) /* central directory size in bytes */
133 #define ZIP64_ENDOFF(b) LL(b, 48) /* offset of first CEN header */
134
135 /*
136 * Macros for getting Zip64 end of central directory locator fields
137 */
138 #define ZIP64_LOCDSK(b) LG(b, 4) /* disk number start */
139 #define ZIP64_LOCOFF(b) LL(b, 8) /* offset of zip64 end */
140 #define ZIP64_LOCTOT(b) LG(b, 16) /* total number of disks */
141
142 /*
143 * Supported compression methods
144 */
145 #define STORED 0
146 #define DEFLATED 8
147
148 /*
149 * Support for reading ZIP/JAR files. Some things worth noting:
150 *
151 * - Zip file entries larger than 2**32 bytes are not supported.
152 * - jzentry time and crc fields are signed even though they really
153 * represent unsigned quantities.
154 * - If csize is zero then the entry is uncompressed.
155 * - If extra != 0 then the first two bytes are the length of the extra
156 * data in intel byte order.
157 * - If pos <= 0 then it is the position of entry LOC header.
158 * If pos > 0 then it is the position of entry data.
159 * pos should not be accessed directly, but only by ZIP_GetEntryDataOffset.
160 * - entry name may include embedded null character, use nlen for length
161 */
162
163 typedef struct jzentry { /* Zip file entry */
164 char *name; /* entry name */
165 jlong time; /* modification time */
166 jlong size; /* size of uncompressed data */
167 jlong csize; /* size of compressed data (zero if uncompressed) */
168 jint crc; /* crc of uncompressed data */
169 char *comment; /* optional zip file comment */
170 jbyte *extra; /* optional extra data */
171 jlong pos; /* position of LOC header or entry data */
172 jint flag; /* general purpose flag */
173 jint nlen; /* length of the entry name */
174 } jzentry;
175
176 /*
177 * In-memory hash table cell.
178 * In a typical system we have a *lot* of these, as we have one for
179 * every entry in every active JAR.
180 * Note that in order to save space we don't keep the name in memory,
181 * but merely remember a 32 bit hash.
182 */
183 typedef struct jzcell {
184 unsigned int hash; /* 32 bit hashcode on name */
185 unsigned int next; /* hash chain: index into jzfile->entries */
186 jlong cenpos; /* Offset of central directory file header */
187 } jzcell;
188
189 typedef struct cencache {
190 char *data; /* A cached page of CEN headers */
191 jlong pos; /* file offset of data */
192 } cencache;
193
194 /*
195 * Use ZFILE to represent access to a file in a platform-indepenent
196 * fashion.
197 */
198 #ifdef WIN32
199 #define ZFILE jlong
200 #else
201 #define ZFILE int
202 #endif
203
204 /*
205 * Descriptor for a ZIP file.
206 */
207 typedef struct jzfile { /* Zip file */
208 char *name; /* zip file name */
209 jint refs; /* number of active references */
210 jlong len; /* length (in bytes) of zip file */
211 #ifdef USE_MMAP
212 unsigned char *maddr; /* beginning address of the CEN & ENDHDR */
213 jlong mlen; /* length (in bytes) mmapped */
214 jlong offset; /* offset of the mmapped region from the
215 start of the file. */
216 jboolean usemmap; /* if mmap is used. */
217 #endif
218 jboolean locsig; /* if zip file starts with LOCSIG */
219 cencache cencache; /* CEN header cache */
220 ZFILE zfd; /* open file descriptor */
221 void *lock; /* read lock */
222 char *comment; /* zip file comment */
223 jint clen; /* length of the zip file comment */
224 char *msg; /* zip error message */
225 jzcell *entries; /* array of hash cells */
226 jint total; /* total number of entries */
227 jint *table; /* Hash chain heads: indexes into entries */
228 jint tablelen; /* number of hash heads */
229 struct jzfile *next; /* next zip file in search list */
230 jzentry *cache; /* we cache the most recently freed jzentry */
231 /* Information on metadata names in META-INF directory */
232 char **metanames; /* array of meta names (may have null names) */
233 jint metacurrent; /* the next empty slot in metanames array */
234 jint metacount; /* number of slots in metanames array */
235 jlong lastModified; /* last modified time */
236 jlong locpos; /* position of first LOC header (usually 0) */
237 } jzfile;
238
239 /*
240 * Index representing end of hash chain
241 */
242 #define ZIP_ENDCHAIN ((jint)-1)
243
244 JNIEXPORT jzentry *
245 ZIP_FindEntry(jzfile *zip, char *name, jint *sizeP, jint *nameLenP);
246
247 JNIEXPORT jboolean
248 ZIP_ReadEntry(jzfile *zip, jzentry *entry, unsigned char *buf, char *entrynm);
249
250 JNIEXPORT jzentry *
251 ZIP_GetNextEntry(jzfile *zip, jint n);
252
253 JNIEXPORT jzfile *
254 ZIP_Open(const char *name, char **pmsg);
255
256 jzfile *
257 ZIP_Open_Generic(const char *name, char **pmsg, int mode, jlong lastModified);
258
259 jzfile *
260 ZIP_Get_From_Cache(const char *name, char **pmsg, jlong lastModified);
261
262 jzfile *
263 ZIP_Put_In_Cache(const char *name, ZFILE zfd, char **pmsg, jlong lastModified);
264
265 jzfile *
266 ZIP_Put_In_Cache0(const char *name, ZFILE zfd, char **pmsg, jlong lastModified, jboolean usemmap);
267
268 JNIEXPORT void
269 ZIP_Close(jzfile *zip);
270
271 jzentry *
272 ZIP_GetEntry(jzfile *zip, char *name, jint ulen);
273 void
274 ZIP_Lock(jzfile *zip);
275 void
276 ZIP_Unlock(jzfile *zip);
277 jint
278 ZIP_Read(jzfile *zip, jzentry *entry, jlong pos, void *buf, jint len);
279 void
280 ZIP_FreeEntry(jzfile *zip, jzentry *ze);
281 jlong ZIP_GetEntryDataOffset(jzfile *zip, jzentry *entry);
282 jzentry * ZIP_GetEntry2(jzfile *zip, char *name, jint ulen, jboolean addSlash);
283
284 JNIEXPORT jboolean
285 ZIP_InflateFully(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
286
287 #endif /* !_ZIP_H_ */