/src/libzip/lib/zip_extra_field_api.c

Source
/*
  zip_extra_field_api.c -- public extra fields API functions
  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 "zipint.h"


ZIP_EXTERN int
zip_file_extra_field_delete(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_flags_t flags) {
    zip_dirent_t *de;

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

    if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }

    if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
        return -1;

    if (ZIP_IS_RDONLY(za)) {
        zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
        return -1;
    }

    if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
        return -1;

    de = za->entry[idx].changes;

    de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ZIP_EXTRA_FIELD_ALL, ef_idx, flags);
    return 0;
}


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) {
    zip_dirent_t *de;

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

    if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }

    if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
        return -1;

    if (ZIP_IS_RDONLY(za)) {
        zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
        return -1;
    }
    if (ZIP_WANT_TORRENTZIP(za)) {
        zip_error_set(&za->error, ZIP_ER_NOT_ALLOWED, 0);
        return -1;
    }

    if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
        return -1;

    de = za->entry[idx].changes;

    de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ef_id, ef_idx, flags);
    return 0;
}


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

    zip_dirent_t *de;
    zip_extra_field_t *ef;
    int i;

    if ((flags & ZIP_EF_BOTH) == 0) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
        return NULL;

    if (flags & ZIP_FL_LOCAL)
        if (_zip_read_local_ef(za, idx) < 0)
            return NULL;

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

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

    zip_error_set(&za->error, ZIP_ER_NOENT, 0);
    return NULL;
}


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) {
    zip_dirent_t *de;

    if ((flags & ZIP_EF_BOTH) == 0) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
        return NULL;

    if (flags & ZIP_FL_LOCAL)
        if (_zip_read_local_ef(za, idx) < 0)
            return NULL;

    return _zip_ef_get_by_id(de->extra_fields, lenp, ef_id, ef_idx, flags, &za->error);
}


ZIP_EXTERN zip_int16_t
zip_file_extra_fields_count(zip_t *za, zip_uint64_t idx, zip_flags_t flags) {
    zip_dirent_t *de;
    zip_extra_field_t *ef;
    zip_uint16_t n;

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

    if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
        return -1;

    if (flags & ZIP_FL_LOCAL)
        if (_zip_read_local_ef(za, idx) < 0)
            return -1;

    n = 0;
    for (ef = de->extra_fields; ef; ef = ef->next)
        if (ef->flags & flags & ZIP_EF_BOTH)
            n++;

    return (zip_int16_t)n;
}


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) {
    zip_dirent_t *de;
    zip_extra_field_t *ef;
    zip_uint16_t n;

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

    if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
        return -1;

    if (flags & ZIP_FL_LOCAL)
        if (_zip_read_local_ef(za, idx) < 0)
            return -1;

    n = 0;
    for (ef = de->extra_fields; ef; ef = ef->next)
        if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH))
            n++;

    return (zip_int16_t)n;
}


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) {
    zip_dirent_t *de;
    zip_uint16_t ls, cs;
    zip_extra_field_t *ef, *ef_prev, *ef_new;
    int i, found, new_len;

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

    if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
        return -1;

    if (ZIP_IS_RDONLY(za)) {
        zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
        return -1;
    }
    if (ZIP_WANT_TORRENTZIP(za)) {
        zip_error_set(&za->error, ZIP_ER_NOT_ALLOWED, 0);
        return -1;
    }

    if (ZIP_EF_IS_INTERNAL(ef_id)) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }

    if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
        return -1;

    de = za->entry[idx].changes;

    ef = de->extra_fields;
    ef_prev = NULL;
    i = 0;
    found = 0;

    for (; ef; ef = ef->next) {
        if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
            if (i == ef_idx) {
                found = 1;
                break;
            }
            i++;
        }
        ef_prev = ef;
    }

    if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }

    if (flags & ZIP_EF_LOCAL)
        ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
    else
        ls = 0;
    if (flags & ZIP_EF_CENTRAL)
        cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
    else
        cs = 0;

    new_len = ls > cs ? ls : cs;
    if (found)
        new_len -= ef->size + 4;
    new_len += len + 4;

    if (new_len > ZIP_UINT16_MAX) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }

    if ((ef_new = _zip_ef_new(ef_id, len, data, flags)) == NULL) {
        zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
        return -1;
    }

    if (found) {
        if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
            ef_new->next = ef->next;
            ef->next = NULL;
            _zip_ef_free(ef);
            if (ef_prev)
                ef_prev->next = ef_new;
            else
                de->extra_fields = ef_new;
        }
        else {
            ef->flags &= ~(flags & ZIP_EF_BOTH);
            ef_new->next = ef->next;
            ef->next = ef_new;
        }
    }
    else if (ef_prev) {
        ef_new->next = ef_prev->next;
        ef_prev->next = ef_new;
    }
    else
        de->extra_fields = ef_new;

    return 0;
}


int
_zip_file_extra_field_prepare_for_change(zip_t *za, zip_uint64_t idx) {
    zip_entry_t *e;

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

    e = za->entry + idx;

    if (e->changes && (e->changes->changed & ZIP_DIRENT_EXTRA_FIELD))
        return 0;

    if (e->orig) {
        if (_zip_read_local_ef(za, idx) < 0)
            return -1;
    }

    if (e->changes == NULL) {
        if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
            zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
            return -1;
        }
    }

    if (e->orig && e->orig->extra_fields) {
        if ((e->changes->extra_fields = _zip_ef_clone(e->orig->extra_fields, &za->error)) == NULL)
            return -1;
    }
    e->changes->changed |= ZIP_DIRENT_EXTRA_FIELD;

    return 0;
}

Coverage Report

Created: 2025-11-11 06:52

Line	Count	Source
1		/*
2		zip_extra_field_api.c -- public extra fields API functions
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
35		#include "zipint.h"
36
37
38		ZIP_EXTERN int
39	942	zip_file_extra_field_delete(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_flags_t flags) {
40	942	zip_dirent_t *de;
41
42	942	if ((flags & ZIP_EF_BOTH) == 0) {
43	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
44	0	return -1;
45	0	}
46
47	942	if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
48	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
49	0	return -1;
50	0	}
51
52	942	if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
53	0	return -1;
54
55	942	if (ZIP_IS_RDONLY(za)) {
56	0	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
57	0	return -1;
58	0	}
59
60	942	if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
61	0	return -1;
62
63	942	de = za->entry[idx].changes;
64
65	942	de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ZIP_EXTRA_FIELD_ALL, ef_idx, flags);
66	942	return 0;
67	942	}
68
69
70		ZIP_EXTERN int
71	0	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	0	zip_dirent_t *de;
73
74	0	if ((flags & ZIP_EF_BOTH) == 0) {
75	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
76	0	return -1;
77	0	}
78
79	0	if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
80	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
81	0	return -1;
82	0	}
83
84	0	if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
85	0	return -1;
86
87	0	if (ZIP_IS_RDONLY(za)) {
88	0	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
89	0	return -1;
90	0	}
91	0	if (ZIP_WANT_TORRENTZIP(za)) {
92	0	zip_error_set(&za->error, ZIP_ER_NOT_ALLOWED, 0);
93	0	return -1;
94	0	}
95
96	0	if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
97	0	return -1;
98
99	0	de = za->entry[idx].changes;
100
101	0	de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ef_id, ef_idx, flags);
102	0	return 0;
103	0	}
104
105
106		ZIP_EXTERN const zip_uint8_t *
107	0	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) {
108	0	static const zip_uint8_t empty[1] = {'\0'};
109
110	0	zip_dirent_t *de;
111	0	zip_extra_field_t *ef;
112	0	int i;
113
114	0	if ((flags & ZIP_EF_BOTH) == 0) {
115	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
116	0	return NULL;
117	0	}
118
119	0	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
120	0	return NULL;
121
122	0	if (flags & ZIP_FL_LOCAL)
123	0	if (_zip_read_local_ef(za, idx) < 0)
124	0	return NULL;
125
126	0	i = 0;
127	0	for (ef = de->extra_fields; ef; ef = ef->next) {
128	0	if (ef->flags & flags & ZIP_EF_BOTH) {
129	0	if (i < ef_idx) {
130	0	i++;
131	0	continue;
132	0	}
133
134	0	if (idp)
135	0	*idp = ef->id;
136	0	if (lenp)
137	0	*lenp = ef->size;
138	0	if (ef->size > 0)
139	0	return ef->data;
140	0	else
141	0	return empty;
142	0	}
143	0	}
144
145	0	zip_error_set(&za->error, ZIP_ER_NOENT, 0);
146	0	return NULL;
147	0	}
148
149
150		ZIP_EXTERN const zip_uint8_t *
151	0	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	0	zip_dirent_t *de;
153
154	0	if ((flags & ZIP_EF_BOTH) == 0) {
155	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
156	0	return NULL;
157	0	}
158
159	0	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
160	0	return NULL;
161
162	0	if (flags & ZIP_FL_LOCAL)
163	0	if (_zip_read_local_ef(za, idx) < 0)
164	0	return NULL;
165
166	0	return _zip_ef_get_by_id(de->extra_fields, lenp, ef_id, ef_idx, flags, &za->error);
167	0	}
168
169
170		ZIP_EXTERN zip_int16_t
171	0	zip_file_extra_fields_count(zip_t *za, zip_uint64_t idx, zip_flags_t flags) {
172	0	zip_dirent_t *de;
173	0	zip_extra_field_t *ef;
174	0	zip_uint16_t n;
175
176	0	if ((flags & ZIP_EF_BOTH) == 0) {
177	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
178	0	return -1;
179	0	}
180
181	0	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
182	0	return -1;
183
184	0	if (flags & ZIP_FL_LOCAL)
185	0	if (_zip_read_local_ef(za, idx) < 0)
186	0	return -1;
187
188	0	n = 0;
189	0	for (ef = de->extra_fields; ef; ef = ef->next)
190	0	if (ef->flags & flags & ZIP_EF_BOTH)
191	0	n++;
192
193	0	return (zip_int16_t)n;
194	0	}
195
196
197		ZIP_EXTERN zip_int16_t
198	0	zip_file_extra_fields_count_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_flags_t flags) {
199	0	zip_dirent_t *de;
200	0	zip_extra_field_t *ef;
201	0	zip_uint16_t n;
202
203	0	if ((flags & ZIP_EF_BOTH) == 0) {
204	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
205	0	return -1;
206	0	}
207
208	0	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
209	0	return -1;
210
211	0	if (flags & ZIP_FL_LOCAL)
212	0	if (_zip_read_local_ef(za, idx) < 0)
213	0	return -1;
214
215	0	n = 0;
216	0	for (ef = de->extra_fields; ef; ef = ef->next)
217	0	if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH))
218	0	n++;
219
220	0	return (zip_int16_t)n;
221	0	}
222
223
224		ZIP_EXTERN int
225	0	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) {
226	0	zip_dirent_t *de;
227	0	zip_uint16_t ls, cs;
228	0	zip_extra_field_t ef, ef_prev, *ef_new;
229	0	int i, found, new_len;
230
231	0	if ((flags & ZIP_EF_BOTH) == 0) {
232	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
233	0	return -1;
234	0	}
235
236	0	if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
237	0	return -1;
238
239	0	if (ZIP_IS_RDONLY(za)) {
240	0	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
241	0	return -1;
242	0	}
243	0	if (ZIP_WANT_TORRENTZIP(za)) {
244	0	zip_error_set(&za->error, ZIP_ER_NOT_ALLOWED, 0);
245	0	return -1;
246	0	}
247
248	0	if (ZIP_EF_IS_INTERNAL(ef_id)) {
249	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
250	0	return -1;
251	0	}
252
253	0	if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
254	0	return -1;
255
256	0	de = za->entry[idx].changes;
257
258	0	ef = de->extra_fields;
259	0	ef_prev = NULL;
260	0	i = 0;
261	0	found = 0;
262
263	0	for (; ef; ef = ef->next) {
264	0	if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
265	0	if (i == ef_idx) {
266	0	found = 1;
267	0	break;
268	0	}
269	0	i++;
270	0	}
271	0	ef_prev = ef;
272	0	}
273
274	0	if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
275	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
276	0	return -1;
277	0	}
278
279	0	if (flags & ZIP_EF_LOCAL)
280	0	ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
281	0	else
282	0	ls = 0;
283	0	if (flags & ZIP_EF_CENTRAL)
284	0	cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
285	0	else
286	0	cs = 0;
287
288	0	new_len = ls > cs ? ls : cs;
289	0	if (found)
290	0	new_len -= ef->size + 4;
291	0	new_len += len + 4;
292
293	0	if (new_len > ZIP_UINT16_MAX) {
294	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
295	0	return -1;
296	0	}
297
298	0	if ((ef_new = _zip_ef_new(ef_id, len, data, flags)) == NULL) {
299	0	zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
300	0	return -1;
301	0	}
302
303	0	if (found) {
304	0	if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
305	0	ef_new->next = ef->next;
306	0	ef->next = NULL;
307	0	_zip_ef_free(ef);
308	0	if (ef_prev)
309	0	ef_prev->next = ef_new;
310	0	else
311	0	de->extra_fields = ef_new;
312	0	}
313	0	else {
314	0	ef->flags &= ~(flags & ZIP_EF_BOTH);
315	0	ef_new->next = ef->next;
316	0	ef->next = ef_new;
317	0	}
318	0	}
319	0	else if (ef_prev) {
320	0	ef_new->next = ef_prev->next;
321	0	ef_prev->next = ef_new;
322	0	}
323	0	else
324	0	de->extra_fields = ef_new;
325
326	0	return 0;
327	0	}
328
329
330		int
331	942	_zip_file_extra_field_prepare_for_change(zip_t *za, zip_uint64_t idx) {
332	942	zip_entry_t *e;
333
334	942	if (idx >= za->nentry) {
335	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
336	0	return -1;
337	0	}
338
339	942	e = za->entry + idx;
340
341	942	if (e->changes && (e->changes->changed & ZIP_DIRENT_EXTRA_FIELD))
342	0	return 0;
343
344	942	if (e->orig) {
345	0	if (_zip_read_local_ef(za, idx) < 0)
346	0	return -1;
347	0	}
348
349	942	if (e->changes == NULL) {
350	0	if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
351	0	zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
352	0	return -1;
353	0	}
354	0	}
355
356	942	if (e->orig && e->orig->extra_fields) {
357	0	if ((e->changes->extra_fields = _zip_ef_clone(e->orig->extra_fields, &za->error)) == NULL)
358	0	return -1;
359	0	}
360	942	e->changes->changed \|= ZIP_DIRENT_EXTRA_FIELD;
361
362	942	return 0;
363	942	}