/src/libzip/lib/zip_extra_field.c

Source
/*
  zip_extra_field.c -- manipulate extra fields
  Copyright (C) 2012-2024 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <info@libzip.org>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The names of the authors may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdlib.h>
#include <string.h>

#include "zipint.h"


zip_extra_field_t *_zip_ef_clone(const zip_extra_field_t *ef, zip_error_t *error) {
    zip_extra_field_t *head, *prev, *def;

    head = prev = NULL;

    while (ef) {
        if ((def = _zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
            zip_error_set(error, ZIP_ER_MEMORY, 0);
            _zip_ef_free(head);
            return NULL;
        }

        if (head == NULL) {
            head = def;
        }
        if (prev) {
            prev->next = def;
        }
        prev = def;

        ef = ef->next;
    }

    return head;
}


zip_extra_field_t *_zip_ef_delete_by_id(zip_extra_field_t *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
    zip_extra_field_t *head, *prev;
    int i;

    i = 0;
    head = ef;
    prev = NULL;
    for (; ef; ef = (prev ? prev->next : head)) {
        if ((ef->flags & flags & ZIP_EF_BOTH) && ((ef->id == id) || (id == ZIP_EXTRA_FIELD_ALL))) {
            if (id_idx == ZIP_EXTRA_FIELD_ALL || i == id_idx) {
                ef->flags &= ~(flags & ZIP_EF_BOTH);
                if ((ef->flags & ZIP_EF_BOTH) == 0) {
                    if (prev) {
                        prev->next = ef->next;
                    }
                    else {
                        head = ef->next;
                    }
                    ef->next = NULL;
                    _zip_ef_free(ef);

                    if (id_idx == ZIP_EXTRA_FIELD_ALL) {
                        continue;
                    }
                }
            }

            i++;
            if (i > id_idx) {
                break;
            }
        }
        prev = ef;
    }

    return head;
}


void _zip_ef_free(zip_extra_field_t *ef) {
    zip_extra_field_t *ef2;

    while (ef) {
        ef2 = ef->next;
        free(ef->data);
        free(ef);
        ef = ef2;
    }
}


const zip_uint8_t *_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) {
    static const zip_uint8_t empty[1] = {'\0'};

    int i;

    i = 0;
    for (; ef; ef = ef->next) {
        if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
            if (i < id_idx) {
                i++;
                continue;
            }

            if (lenp) {
                *lenp = ef->size;
            }
            if (ef->size > 0) {
                return ef->data;
            }
            else {
                return empty;
            }
        }
    }

    zip_error_set(error, ZIP_ER_NOENT, 0);
    return NULL;
}


zip_extra_field_t *_zip_ef_merge(zip_extra_field_t *to, zip_extra_field_t *from) {
    zip_extra_field_t *ef2, *tt, *tail;
    int duplicate;

    if (to == NULL) {
        return from;
    }

    for (tail = to; tail->next; tail = tail->next)
        ;

    for (; from; from = ef2) {
        ef2 = from->next;

        duplicate = 0;
        for (tt = to; tt; tt = tt->next) {
            if (tt->id == from->id && tt->size == from->size && (tt->size == 0 || memcmp(tt->data, from->data, tt->size) == 0)) {
                tt->flags |= (from->flags & ZIP_EF_BOTH);
                duplicate = 1;
                break;
            }
        }

        from->next = NULL;
        if (duplicate) {
            _zip_ef_free(from);
        }
        else {
            tail = tail->next = from;
        }
    }

    return to;
}


zip_extra_field_t *_zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags) {
    zip_extra_field_t *ef;

    if ((ef = (zip_extra_field_t *)malloc(sizeof(*ef))) == NULL) {
        return NULL;
    }

    ef->next = NULL;
    ef->flags = flags;
    ef->id = id;
    ef->size = size;
    if (size > 0) {
        if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
            free(ef);
            return NULL;
        }
    }
    else {
        ef->data = NULL;
    }

    return ef;
}


bool _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) {
    zip_buffer_t *buffer;
    zip_extra_field_t *ef, *ef2, *ef_head;

    if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return false;
    }

    ef_head = ef = NULL;

    while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
        zip_uint16_t fid, flen;
        zip_uint8_t *ef_data;

        fid = _zip_buffer_get_16(buffer);
        flen = _zip_buffer_get_16(buffer);
        ef_data = _zip_buffer_get(buffer, flen);

        if (ef_data == NULL) {
            zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
            _zip_buffer_free(buffer);
            _zip_ef_free(ef_head);
            return false;
        }

        if ((ef2 = _zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
            zip_error_set(error, ZIP_ER_MEMORY, 0);
            _zip_buffer_free(buffer);
            _zip_ef_free(ef_head);
            return false;
        }

        if (ef_head) {
            ef->next = ef2;
            ef = ef2;
        }
        else {
            ef_head = ef = ef2;
        }
    }

    if (!_zip_buffer_eof(buffer)) {
        /* Android APK files align stored file data with padding in extra fields; ignore. */
        /* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
        /* buffer is at most 64k long, so this can't overflow. */
        size_t glen = _zip_buffer_left(buffer);
        zip_uint8_t *garbage;
        garbage = _zip_buffer_get(buffer, glen);
        if (glen >= 4 || garbage == NULL || memcmp(garbage, "\0\0\0", (size_t)glen) != 0) {
            zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
            _zip_buffer_free(buffer);
            _zip_ef_free(ef_head);
            return false;
        }
    }

    _zip_buffer_free(buffer);

    if (ef_head_p) {
        *ef_head_p = ef_head;
    }
    else {
        _zip_ef_free(ef_head);
    }

    return true;
}


zip_extra_field_t *_zip_ef_remove_internal(zip_extra_field_t *ef) {
    zip_extra_field_t *ef_head;
    zip_extra_field_t *prev, *next;

    ef_head = ef;
    prev = NULL;

    while (ef) {
        if (ZIP_EF_IS_INTERNAL(ef->id)) {
            next = ef->next;
            if (ef_head == ef) {
                ef_head = next;
            }
            ef->next = NULL;
            _zip_ef_free(ef);
            if (prev) {
                prev->next = next;
            }
            ef = next;
        }
        else {
            prev = ef;
            ef = ef->next;
        }
    }

    return ef_head;
}


zip_uint16_t _zip_ef_size(const zip_extra_field_t *ef, zip_flags_t flags) {
    zip_uint16_t size;

    size = 0;
    for (; ef; ef = ef->next) {
        if (ef->flags & flags & ZIP_EF_BOTH) {
            size = (zip_uint16_t)(size + 4 + ef->size);
        }
    }

    return size;
}


int _zip_ef_write(zip_t *za, const zip_extra_field_t *ef, zip_flags_t flags) {
    zip_uint8_t b[4];
    zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));

    if (buffer == NULL) {
        return -1;
    }

    for (; ef; ef = ef->next) {
        if (ef->flags & flags & ZIP_EF_BOTH) {
            _zip_buffer_set_offset(buffer, 0);
            _zip_buffer_put_16(buffer, ef->id);
            _zip_buffer_put_16(buffer, ef->size);
            if (!_zip_buffer_ok(buffer)) {
                zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
                _zip_buffer_free(buffer);
                return -1;
            }
            if (_zip_write(za, b, 4) < 0) {
                _zip_buffer_free(buffer);
                return -1;
            }
            if (ef->size > 0) {
                if (_zip_write(za, ef->data, ef->size) < 0) {
                    _zip_buffer_free(buffer);
                    return -1;
                }
            }
        }
    }

    _zip_buffer_free(buffer);
    return 0;
}


int _zip_read_local_ef(zip_t *za, zip_uint64_t idx) {
    zip_entry_t *e;
    unsigned char b[4];
    zip_buffer_t *buffer;
    zip_uint16_t fname_len, ef_len;

    if (idx >= za->nentry) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }

    e = za->entry + idx;

    if (e->orig == NULL || e->orig->local_extra_fields_read) {
        return 0;
    }

    if (e->orig->offset + 26 > ZIP_INT64_MAX) {
        zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
        return -1;
    }

    if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
        zip_error_set_from_source(&za->error, za->src);
        return -1;
    }

    if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
        return -1;
    }

    fname_len = _zip_buffer_get_16(buffer);
    ef_len = _zip_buffer_get_16(buffer);

    if (!_zip_buffer_eof(buffer)) {
        _zip_buffer_free(buffer);
        zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
        return -1;
    }

    _zip_buffer_free(buffer);

    if (ef_len > 0) {
        zip_extra_field_t *ef;
        zip_uint8_t *ef_raw;

        if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
            zip_error_set(&za->error, ZIP_ER_SEEK, errno);
            return -1;
        }

        ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);

        if (ef_raw == NULL) {
            return -1;
        }

        if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
            free(ef_raw);
            return -1;
        }
        free(ef_raw);

        if (ef) {
            ef = _zip_ef_remove_internal(ef);
            e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
        }
    }

    e->orig->local_extra_fields_read = 1;

    if (e->changes && e->changes->local_extra_fields_read == 0) {
        e->changes->extra_fields = e->orig->extra_fields;
        e->changes->local_extra_fields_read = 1;
    }

    return 0;
}

Coverage Report

Created: 2026-04-01 07:49

Line	Count	Source
1		/*
2		zip_extra_field.c -- manipulate extra fields
3		Copyright (C) 2012-2024 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 <info@libzip.org>
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		#include <stdlib.h>
35		#include <string.h>
36
37		#include "zipint.h"
38
39
40	0	zip_extra_field_t _zip_ef_clone(const zip_extra_field_t ef, zip_error_t *error) {
41	0	zip_extra_field_t head, prev, *def;
42
43	0	head = prev = NULL;
44
45	0	while (ef) {
46	0	if ((def = _zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
47	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
48	0	_zip_ef_free(head);
49	0	return NULL;
50	0	}
51
52	0	if (head == NULL) {
53	0	head = def;
54	0	}
55	0	if (prev) {
56	0	prev->next = def;
57	0	}
58	0	prev = def;
59
60	0	ef = ef->next;
61	0	}
62
63	0	return head;
64	0	}
65
66
67	0	zip_extra_field_t _zip_ef_delete_by_id(zip_extra_field_t ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
68	0	zip_extra_field_t head, prev;
69	0	int i;
70
71	0	i = 0;
72	0	head = ef;
73	0	prev = NULL;
74	0	for (; ef; ef = (prev ? prev->next : head)) {
75	0	if ((ef->flags & flags & ZIP_EF_BOTH) && ((ef->id == id) \|\| (id == ZIP_EXTRA_FIELD_ALL))) {
76	0	if (id_idx == ZIP_EXTRA_FIELD_ALL \|\| i == id_idx) {
77	0	ef->flags &= ~(flags & ZIP_EF_BOTH);
78	0	if ((ef->flags & ZIP_EF_BOTH) == 0) {
79	0	if (prev) {
80	0	prev->next = ef->next;
81	0	}
82	0	else {
83	0	head = ef->next;
84	0	}
85	0	ef->next = NULL;
86	0	_zip_ef_free(ef);
87
88	0	if (id_idx == ZIP_EXTRA_FIELD_ALL) {
89	0	continue;
90	0	}
91	0	}
92	0	}
93
94	0	i++;
95	0	if (i > id_idx) {
96	0	break;
97	0	}
98	0	}
99	0	prev = ef;
100	0	}
101
102	0	return head;
103	0	}
104
105
106	0	void _zip_ef_free(zip_extra_field_t *ef) {
107	0	zip_extra_field_t *ef2;
108
109	0	while (ef) {
110	0	ef2 = ef->next;
111	0	free(ef->data);
112	0	free(ef);
113	0	ef = ef2;
114	0	}
115	0	}
116
117
118	0	const zip_uint8_t _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) {
119	0	static const zip_uint8_t empty[1] = {'\0'};
120
121	0	int i;
122
123	0	i = 0;
124	0	for (; ef; ef = ef->next) {
125	0	if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
126	0	if (i < id_idx) {
127	0	i++;
128	0	continue;
129	0	}
130
131	0	if (lenp) {
132	0	*lenp = ef->size;
133	0	}
134	0	if (ef->size > 0) {
135	0	return ef->data;
136	0	}
137	0	else {
138	0	return empty;
139	0	}
140	0	}
141	0	}
142
143	0	zip_error_set(error, ZIP_ER_NOENT, 0);
144	0	return NULL;
145	0	}
146
147
148	0	zip_extra_field_t _zip_ef_merge(zip_extra_field_t to, zip_extra_field_t *from) {
149	0	zip_extra_field_t ef2, tt, *tail;
150	0	int duplicate;
151
152	0	if (to == NULL) {
153	0	return from;
154	0	}
155
156	0	for (tail = to; tail->next; tail = tail->next)
157	0	;
158
159	0	for (; from; from = ef2) {
160	0	ef2 = from->next;
161
162	0	duplicate = 0;
163	0	for (tt = to; tt; tt = tt->next) {
164	0	if (tt->id == from->id && tt->size == from->size && (tt->size == 0 \|\| memcmp(tt->data, from->data, tt->size) == 0)) {
165	0	tt->flags \|= (from->flags & ZIP_EF_BOTH);
166	0	duplicate = 1;
167	0	break;
168	0	}
169	0	}
170
171	0	from->next = NULL;
172	0	if (duplicate) {
173	0	_zip_ef_free(from);
174	0	}
175	0	else {
176	0	tail = tail->next = from;
177	0	}
178	0	}
179
180	0	return to;
181	0	}
182
183
184	0	zip_extra_field_t _zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t data, zip_flags_t flags) {
185	0	zip_extra_field_t *ef;
186
187	0	if ((ef = (zip_extra_field_t )malloc(sizeof(ef))) == NULL) {
188	0	return NULL;
189	0	}
190
191	0	ef->next = NULL;
192	0	ef->flags = flags;
193	0	ef->id = id;
194	0	ef->size = size;
195	0	if (size > 0) {
196	0	if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
197	0	free(ef);
198	0	return NULL;
199	0	}
200	0	}
201	0	else {
202	0	ef->data = NULL;
203	0	}
204
205	0	return ef;
206	0	}
207
208
209	0	bool _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) {
210	0	zip_buffer_t *buffer;
211	0	zip_extra_field_t ef, ef2, *ef_head;
212
213	0	if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
214	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
215	0	return false;
216	0	}
217
218	0	ef_head = ef = NULL;
219
220	0	while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
221	0	zip_uint16_t fid, flen;
222	0	zip_uint8_t *ef_data;
223
224	0	fid = _zip_buffer_get_16(buffer);
225	0	flen = _zip_buffer_get_16(buffer);
226	0	ef_data = _zip_buffer_get(buffer, flen);
227
228	0	if (ef_data == NULL) {
229	0	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
230	0	_zip_buffer_free(buffer);
231	0	_zip_ef_free(ef_head);
232	0	return false;
233	0	}
234
235	0	if ((ef2 = _zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
236	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
237	0	_zip_buffer_free(buffer);
238	0	_zip_ef_free(ef_head);
239	0	return false;
240	0	}
241
242	0	if (ef_head) {
243	0	ef->next = ef2;
244	0	ef = ef2;
245	0	}
246	0	else {
247	0	ef_head = ef = ef2;
248	0	}
249	0	}
250
251	0	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		/* buffer is at most 64k long, so this can't overflow. */
255	0	size_t glen = _zip_buffer_left(buffer);
256	0	zip_uint8_t *garbage;
257	0	garbage = _zip_buffer_get(buffer, glen);
258	0	if (glen >= 4 \|\| garbage == NULL \|\| memcmp(garbage, "\0\0\0", (size_t)glen) != 0) {
259	0	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
260	0	_zip_buffer_free(buffer);
261	0	_zip_ef_free(ef_head);
262	0	return false;
263	0	}
264	0	}
265
266	0	_zip_buffer_free(buffer);
267
268	0	if (ef_head_p) {
269	0	*ef_head_p = ef_head;
270	0	}
271	0	else {
272	0	_zip_ef_free(ef_head);
273	0	}
274
275	0	return true;
276	0	}
277
278
279	0	zip_extra_field_t _zip_ef_remove_internal(zip_extra_field_t ef) {
280	0	zip_extra_field_t *ef_head;
281	0	zip_extra_field_t prev, next;
282
283	0	ef_head = ef;
284	0	prev = NULL;
285
286	0	while (ef) {
287	0	if (ZIP_EF_IS_INTERNAL(ef->id)) {
288	0	next = ef->next;
289	0	if (ef_head == ef) {
290	0	ef_head = next;
291	0	}
292	0	ef->next = NULL;
293	0	_zip_ef_free(ef);
294	0	if (prev) {
295	0	prev->next = next;
296	0	}
297	0	ef = next;
298	0	}
299	0	else {
300	0	prev = ef;
301	0	ef = ef->next;
302	0	}
303	0	}
304
305	0	return ef_head;
306	0	}
307
308
309	0	zip_uint16_t _zip_ef_size(const zip_extra_field_t *ef, zip_flags_t flags) {
310	0	zip_uint16_t size;
311
312	0	size = 0;
313	0	for (; ef; ef = ef->next) {
314	0	if (ef->flags & flags & ZIP_EF_BOTH) {
315	0	size = (zip_uint16_t)(size + 4 + ef->size);
316	0	}
317	0	}
318
319	0	return size;
320	0	}
321
322
323	0	int _zip_ef_write(zip_t za, const zip_extra_field_t ef, zip_flags_t flags) {
324	0	zip_uint8_t b[4];
325	0	zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));
326
327	0	if (buffer == NULL) {
328	0	return -1;
329	0	}
330
331	0	for (; ef; ef = ef->next) {
332	0	if (ef->flags & flags & ZIP_EF_BOTH) {
333	0	_zip_buffer_set_offset(buffer, 0);
334	0	_zip_buffer_put_16(buffer, ef->id);
335	0	_zip_buffer_put_16(buffer, ef->size);
336	0	if (!_zip_buffer_ok(buffer)) {
337	0	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
338	0	_zip_buffer_free(buffer);
339	0	return -1;
340	0	}
341	0	if (_zip_write(za, b, 4) < 0) {
342	0	_zip_buffer_free(buffer);
343	0	return -1;
344	0	}
345	0	if (ef->size > 0) {
346	0	if (_zip_write(za, ef->data, ef->size) < 0) {
347	0	_zip_buffer_free(buffer);
348	0	return -1;
349	0	}
350	0	}
351	0	}
352	0	}
353
354	0	_zip_buffer_free(buffer);
355	0	return 0;
356	0	}
357
358
359	0	int _zip_read_local_ef(zip_t *za, zip_uint64_t idx) {
360	0	zip_entry_t *e;
361	0	unsigned char b[4];
362	0	zip_buffer_t *buffer;
363	0	zip_uint16_t fname_len, ef_len;
364
365	0	if (idx >= za->nentry) {
366	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
367	0	return -1;
368	0	}
369
370	0	e = za->entry + idx;
371
372	0	if (e->orig == NULL \|\| e->orig->local_extra_fields_read) {
373	0	return 0;
374	0	}
375
376	0	if (e->orig->offset + 26 > ZIP_INT64_MAX) {
377	0	zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
378	0	return -1;
379	0	}
380
381	0	if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
382	0	zip_error_set_from_source(&za->error, za->src);
383	0	return -1;
384	0	}
385
386	0	if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
387	0	return -1;
388	0	}
389
390	0	fname_len = _zip_buffer_get_16(buffer);
391	0	ef_len = _zip_buffer_get_16(buffer);
392
393	0	if (!_zip_buffer_eof(buffer)) {
394	0	_zip_buffer_free(buffer);
395	0	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
396	0	return -1;
397	0	}
398
399	0	_zip_buffer_free(buffer);
400
401	0	if (ef_len > 0) {
402	0	zip_extra_field_t *ef;
403	0	zip_uint8_t *ef_raw;
404
405	0	if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
406	0	zip_error_set(&za->error, ZIP_ER_SEEK, errno);
407	0	return -1;
408	0	}
409
410	0	ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);
411
412	0	if (ef_raw == NULL) {
413	0	return -1;
414	0	}
415
416	0	if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
417	0	free(ef_raw);
418	0	return -1;
419	0	}
420	0	free(ef_raw);
421
422	0	if (ef) {
423	0	ef = _zip_ef_remove_internal(ef);
424	0	e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
425	0	}
426	0	}
427
428	0	e->orig->local_extra_fields_read = 1;
429
430	0	if (e->changes && e->changes->local_extra_fields_read == 0) {
431	0	e->changes->extra_fields = e->orig->extra_fields;
432	0	e->changes->local_extra_fields_read = 1;
433	0	}
434
435	0	return 0;
436	0	}