1 /*
2 zip_extra_field_api.c -- public extra fields API functions
3 Copyright (C) 2012-2014 Dieter Baron and Thomas Klausner
4
5 This file is part of libzip, a library to manipulate ZIP archives.
6 The authors can be contacted at <libzip@nih.at>
7
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions
10 are met:
11 1. Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
13 2. Redistributions in binary form must reproduce the above copyright
14 notice, this list of conditions and the following disclaimer in
15 the documentation and/or other materials provided with the
16 distribution.
17 3. The names of the authors may not be used to endorse or promote
18 products derived from this software without specific prior
19 written permission.
20
21 THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34
35 #include "zipint.h"
36
37
38 ZIP_EXTERN int
zip_file_extra_field_delete(zip_t * za,zip_uint64_t idx,zip_uint16_t ef_idx,zip_flags_t flags)39 zip_file_extra_field_delete(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_flags_t flags)
40 {
41 zip_dirent_t *de;
42
43 if ((flags & ZIP_EF_BOTH) == 0) {
44 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
45 return -1;
46 }
47
48 if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
49 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
50 return -1;
51 }
52
53 if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
54 return -1;
55
56 if (ZIP_IS_RDONLY(za)) {
57 zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
58 return -1;
59 }
60
61 if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
62 return -1;
63
64 de = za->entry[idx].changes;
65
66 de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ZIP_EXTRA_FIELD_ALL, ef_idx, flags);
67 return 0;
68 }
69
70
71 ZIP_EXTERN int
zip_file_extra_field_delete_by_id(zip_t * za,zip_uint64_t idx,zip_uint16_t ef_id,zip_uint16_t ef_idx,zip_flags_t flags)72 zip_file_extra_field_delete_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_flags_t flags)
73 {
74 zip_dirent_t *de;
75
76 if ((flags & ZIP_EF_BOTH) == 0) {
77 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
78 return -1;
79 }
80
81 if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
82 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
83 return -1;
84 }
85
86 if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
87 return -1;
88
89 if (ZIP_IS_RDONLY(za)) {
90 zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
91 return -1;
92 }
93
94 if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
95 return -1;
96
97 de = za->entry[idx].changes;
98
99 de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ef_id, ef_idx, flags);
100 return 0;
101 }
102
103
104 ZIP_EXTERN const zip_uint8_t *
zip_file_extra_field_get(zip_t * za,zip_uint64_t idx,zip_uint16_t ef_idx,zip_uint16_t * idp,zip_uint16_t * lenp,zip_flags_t flags)105 zip_file_extra_field_get(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_uint16_t *idp, zip_uint16_t *lenp, zip_flags_t flags)
106 {
107 static const zip_uint8_t empty[1] = { '\0' };
108
109 zip_dirent_t *de;
110 zip_extra_field_t *ef;
111 int i;
112
113 if ((flags & ZIP_EF_BOTH) == 0) {
114 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
115 return NULL;
116 }
117
118 if ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
119 return NULL;
120
121 if (flags & ZIP_FL_LOCAL)
122 if (_zip_read_local_ef(za, idx) < 0)
123 return NULL;
124
125 i = 0;
126 for (ef=de->extra_fields; ef; ef=ef->next) {
127 if (ef->flags & flags & ZIP_EF_BOTH) {
128 if (i < ef_idx) {
129 i++;
130 continue;
131 }
132
133 if (idp)
134 *idp = ef->id;
135 if (lenp)
136 *lenp = ef->size;
137 if (ef->size > 0)
138 return ef->data;
139 else
140 return empty;
141 }
142 }
143
144 zip_error_set(&za->error, ZIP_ER_NOENT, 0);
145 return NULL;
146
147 }
148
149
150 ZIP_EXTERN const zip_uint8_t *
zip_file_extra_field_get_by_id(zip_t * za,zip_uint64_t idx,zip_uint16_t ef_id,zip_uint16_t ef_idx,zip_uint16_t * lenp,zip_flags_t flags)151 zip_file_extra_field_get_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_uint16_t *lenp, zip_flags_t flags)
152 {
153 zip_dirent_t *de;
154
155 if ((flags & ZIP_EF_BOTH) == 0) {
156 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
157 return NULL;
158 }
159
160 if ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
161 return NULL;
162
163 if (flags & ZIP_FL_LOCAL)
164 if (_zip_read_local_ef(za, idx) < 0)
165 return NULL;
166
167 return _zip_ef_get_by_id(de->extra_fields, lenp, ef_id, ef_idx, flags, &za->error);
168 }
169
170
171 ZIP_EXTERN zip_int16_t
zip_file_extra_fields_count(zip_t * za,zip_uint64_t idx,zip_flags_t flags)172 zip_file_extra_fields_count(zip_t *za, zip_uint64_t idx, zip_flags_t flags)
173 {
174 zip_dirent_t *de;
175 zip_extra_field_t *ef;
176 zip_uint16_t n;
177
178 if ((flags & ZIP_EF_BOTH) == 0) {
179 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
180 return -1;
181 }
182
183 if ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
184 return -1;
185
186 if (flags & ZIP_FL_LOCAL)
187 if (_zip_read_local_ef(za, idx) < 0)
188 return -1;
189
190 n = 0;
191 for (ef=de->extra_fields; ef; ef=ef->next)
192 if (ef->flags & flags & ZIP_EF_BOTH)
193 n++;
194
195 return (zip_int16_t)n;
196 }
197
198
199 ZIP_EXTERN zip_int16_t
zip_file_extra_fields_count_by_id(zip_t * za,zip_uint64_t idx,zip_uint16_t ef_id,zip_flags_t flags)200 zip_file_extra_fields_count_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_flags_t flags)
201 {
202 zip_dirent_t *de;
203 zip_extra_field_t *ef;
204 zip_uint16_t n;
205
206 if ((flags & ZIP_EF_BOTH) == 0) {
207 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
208 return -1;
209 }
210
211 if ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
212 return -1;
213
214 if (flags & ZIP_FL_LOCAL)
215 if (_zip_read_local_ef(za, idx) < 0)
216 return -1;
217
218 n = 0;
219 for (ef=de->extra_fields; ef; ef=ef->next)
220 if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH))
221 n++;
222
223 return (zip_int16_t)n;
224 }
225
226
227 ZIP_EXTERN int
zip_file_extra_field_set(zip_t * za,zip_uint64_t idx,zip_uint16_t ef_id,zip_uint16_t ef_idx,const zip_uint8_t * data,zip_uint16_t len,zip_flags_t flags)228 zip_file_extra_field_set(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags)
229 {
230 zip_dirent_t *de;
231 zip_uint16_t ls, cs;
232 zip_extra_field_t *ef, *ef_prev, *ef_new;
233 int i, found, new_len;
234
235 if ((flags & ZIP_EF_BOTH) == 0) {
236 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
237 return -1;
238 }
239
240 if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
241 return -1;
242
243 if (ZIP_IS_RDONLY(za)) {
244 zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
245 return -1;
246 }
247
248 if (ZIP_EF_IS_INTERNAL(ef_id)) {
249 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
250 return -1;
251 }
252
253 if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
254 return -1;
255
256 de = za->entry[idx].changes;
257
258 ef = de->extra_fields;
259 ef_prev = NULL;
260 i = 0;
261 found = 0;
262
263 for (; ef; ef=ef->next) {
264 if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
265 if (i == ef_idx) {
266 found = 1;
267 break;
268 }
269 i++;
270 }
271 ef_prev = ef;
272 }
273
274 if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
275 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
276 return -1;
277 }
278
279 if (flags & ZIP_EF_LOCAL)
280 ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
281 else
282 ls = 0;
283 if (flags & ZIP_EF_CENTRAL)
284 cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
285 else
286 cs = 0;
287
288 new_len = ls > cs ? ls : cs;
289 if (found)
290 new_len -= ef->size + 4;
291 new_len += len + 4;
292
293 if (new_len > ZIP_UINT16_MAX) {
294 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
295 return -1;
296 }
297
298 if ((ef_new=_zip_ef_new(ef_id, len, data, flags)) == NULL) {
299 zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
300 return -1;
301 }
302
303 if (found) {
304 if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
305 ef_new->next = ef->next;
306 ef->next = NULL;
307 _zip_ef_free(ef);
308 if (ef_prev)
309 ef_prev->next = ef_new;
310 else
311 de->extra_fields = ef_new;
312 }
313 else {
314 ef->flags &= ~(flags & ZIP_EF_BOTH);
315 ef_new->next = ef->next;
316 ef->next = ef_new;
317 }
318 }
319 else if (ef_prev) {
320 ef_new->next = ef_prev->next;
321 ef_prev->next = ef_new;
322 }
323 else
324 de->extra_fields = ef_new;
325
326 return 0;
327 }
328
329
330
331 int
_zip_file_extra_field_prepare_for_change(zip_t * za,zip_uint64_t idx)332 _zip_file_extra_field_prepare_for_change(zip_t *za, zip_uint64_t idx)
333 {
334 zip_entry_t *e;
335
336 if (idx >= za->nentry) {
337 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
338 return -1;
339 }
340
341 e = za->entry+idx;
342
343 if (e->changes && (e->changes->changed & ZIP_DIRENT_EXTRA_FIELD))
344 return 0;
345
346 if (e->orig) {
347 if (_zip_read_local_ef(za, idx) < 0)
348 return -1;
349 }
350
351 if (e->changes == NULL) {
352 if ((e->changes=_zip_dirent_clone(e->orig)) == NULL) {
353 zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
354 return -1;
355 }
356 }
357
358 if (e->orig && e->orig->extra_fields) {
359 if ((e->changes->extra_fields=_zip_ef_clone(e->orig->extra_fields, &za->error)) == NULL)
360 return -1;
361 }
362 e->changes->changed |= ZIP_DIRENT_EXTRA_FIELD;
363
364 return 0;
365 }
366
367
