2 zip_extra_field.c -- manipulate extra fields
3 Copyright (C) 2012-2017 Dieter Baron and Thomas Klausner
5 This file is part of libzip, a library to manipulate ZIP archives.
6 The authors can be contacted at <libzip@nih.at>
8 Redistribution and use in source and binary forms, with or without
9 modification, are permitted provided that the following conditions
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
17 3. The names of the authors may not be used to endorse or promote
18 products derived from this software without specific prior
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.
41 _zip_ef_clone(const zip_extra_field_t *ef, zip_error_t *error)
43 zip_extra_field_t *head, *prev, *def;
48 if ((def=_zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
49 zip_error_set(error, ZIP_ER_MEMORY, 0);
68 _zip_ef_delete_by_id(zip_extra_field_t *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags)
70 zip_extra_field_t *head, *prev;
76 for (; ef; ef=(prev ? prev->next : head)) {
77 if ((ef->flags & flags & ZIP_EF_BOTH) && ((ef->id == id) || (id == ZIP_EXTRA_FIELD_ALL))) {
78 if (id_idx == ZIP_EXTRA_FIELD_ALL || i == id_idx) {
79 ef->flags &= ~(flags & ZIP_EF_BOTH);
80 if ((ef->flags & ZIP_EF_BOTH) == 0) {
82 prev->next = ef->next;
88 if (id_idx == ZIP_EXTRA_FIELD_ALL)
106 _zip_ef_free(zip_extra_field_t *ef)
108 zip_extra_field_t *ef2;
120 _zip_ef_get_by_id(const zip_extra_field_t *ef, zip_uint16_t *lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags, zip_error_t *error)
122 static const zip_uint8_t empty[1] = { '\0' };
127 for (; ef; ef=ef->next) {
128 if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
143 zip_error_set(error, ZIP_ER_NOENT, 0);
149 _zip_ef_merge(zip_extra_field_t *to, zip_extra_field_t *from)
151 zip_extra_field_t *ef2, *tt, *tail;
157 for (tail=to; tail->next; tail=tail->next)
160 for (; from; from=ef2) {
164 for (tt=to; tt; tt=tt->next) {
165 if (tt->id == from->id && tt->size == from->size && (tt->size == 0 || memcmp(tt->data, from->data, tt->size) == 0)) {
166 tt->flags |= (from->flags & ZIP_EF_BOTH);
176 tail = tail->next = from;
184 _zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags)
186 zip_extra_field_t *ef;
188 if ((ef=(zip_extra_field_t *)malloc(sizeof(*ef))) == NULL)
196 if ((ef->data=(zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
209 _zip_ef_parse(const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags, zip_extra_field_t **ef_head_p, zip_error_t *error)
211 zip_buffer_t *buffer;
212 zip_extra_field_t *ef, *ef2, *ef_head;
214 if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
215 zip_error_set(error, ZIP_ER_MEMORY, 0);
221 while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
222 zip_uint16_t fid, flen;
223 zip_uint8_t *ef_data;
225 fid = _zip_buffer_get_16(buffer);
226 flen = _zip_buffer_get_16(buffer);
227 ef_data = _zip_buffer_get(buffer, flen);
229 if (ef_data == NULL) {
230 zip_error_set(error, ZIP_ER_INCONS, 0);
231 _zip_buffer_free(buffer);
232 _zip_ef_free(ef_head);
236 if ((ef2=_zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
237 zip_error_set(error, ZIP_ER_MEMORY, 0);
238 _zip_buffer_free(buffer);
239 _zip_ef_free(ef_head);
251 if (!_zip_buffer_eof(buffer)) {
252 /* Android APK files align stored file data with padding in extra fields; ignore. */
253 /* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
254 size_t glen = _zip_buffer_left(buffer);
255 zip_uint8_t *garbage;
256 garbage = _zip_buffer_get(buffer, glen);
257 if (glen >= 4 || garbage == NULL || memcmp(garbage, "\0\0\0", glen) != 0) {
258 zip_error_set(error, ZIP_ER_INCONS, 0);
259 _zip_buffer_free(buffer);
260 _zip_ef_free(ef_head);
265 _zip_buffer_free(buffer);
268 *ef_head_p = ef_head;
271 _zip_ef_free(ef_head);
279 _zip_ef_remove_internal(zip_extra_field_t *ef)
281 zip_extra_field_t *ef_head;
282 zip_extra_field_t *prev, *next;
288 if (ZIP_EF_IS_INTERNAL(ef->id)) {
309 _zip_ef_size(const zip_extra_field_t *ef, zip_flags_t flags)
314 for (; ef; ef=ef->next) {
315 if (ef->flags & flags & ZIP_EF_BOTH)
316 size = (zip_uint16_t)(size+4+ef->size);
324 _zip_ef_write(zip_t *za, const zip_extra_field_t *ef, zip_flags_t flags)
327 zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));
329 if (buffer == NULL) {
333 for (; ef; ef=ef->next) {
334 if (ef->flags & flags & ZIP_EF_BOTH) {
335 _zip_buffer_set_offset(buffer, 0);
336 _zip_buffer_put_16(buffer, ef->id);
337 _zip_buffer_put_16(buffer, ef->size);
338 if (!_zip_buffer_ok(buffer)) {
339 zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
340 _zip_buffer_free(buffer);
343 if (_zip_write(za, b, 4) < 0) {
344 _zip_buffer_free(buffer);
348 if (_zip_write(za, ef->data, ef->size) < 0) {
349 _zip_buffer_free(buffer);
356 _zip_buffer_free(buffer);
362 _zip_read_local_ef(zip_t *za, zip_uint64_t idx)
366 zip_buffer_t *buffer;
367 zip_uint16_t fname_len, ef_len;
369 if (idx >= za->nentry) {
370 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
376 if (e->orig == NULL || e->orig->local_extra_fields_read)
379 if (e->orig->offset + 26 > ZIP_INT64_MAX) {
380 zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
384 if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
385 _zip_error_set_from_source(&za->error, za->src);
389 if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
393 fname_len = _zip_buffer_get_16(buffer);
394 ef_len = _zip_buffer_get_16(buffer);
396 if (!_zip_buffer_eof(buffer)) {
397 _zip_buffer_free(buffer);
398 zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
402 _zip_buffer_free(buffer);
405 zip_extra_field_t *ef;
408 if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
409 zip_error_set(&za->error, ZIP_ER_SEEK, errno);
413 ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);
418 if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
425 ef = _zip_ef_remove_internal(ef);
426 e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
430 e->orig->local_extra_fields_read = 1;
432 if (e->changes && e->changes->local_extra_fields_read == 0) {
433 e->changes->extra_fields = e->orig->extra_fields;
434 e->changes->local_extra_fields_read = 1;