/src/libzip/lib/zip_extra_field.c

Source (jump to first uncovered line)
/*
  zip_extra_field.c -- manipulate extra fields
  Copyright (C) 2012-2022 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: 2025-07-23 06:33

Line	Count	Source (jump to first uncovered line)
1		/*
2		zip_extra_field.c -- manipulate extra fields
3		Copyright (C) 2012-2022 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		zip_extra_field_t *
41	0	_zip_ef_clone(const zip_extra_field_t ef, zip_error_t error) {
42	0	zip_extra_field_t head, prev, *def;
43
44	0	head = prev = NULL;
45
46	0	while (ef) {
47	0	if ((def = _zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
48	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
49	0	_zip_ef_free(head);
50	0	return NULL;
51	0	}
52
53	0	if (head == NULL)
54	0	head = def;
55	0	if (prev)
56	0	prev->next = def;
57	0	prev = def;
58
59	0	ef = ef->next;
60	0	}
61
62	0	return head;
63	0	}
64
65
66		zip_extra_field_t *
67	980	_zip_ef_delete_by_id(zip_extra_field_t *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
68	980	zip_extra_field_t head, prev;
69	980	int i;
70
71	980	i = 0;
72	980	head = ef;
73	980	prev = NULL;
74	980	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	else
82	0	head = ef->next;
83	0	ef->next = NULL;
84	0	_zip_ef_free(ef);
85
86	0	if (id_idx == ZIP_EXTRA_FIELD_ALL)
87	0	continue;
88	0	}
89	0	}
90
91	0	i++;
92	0	if (i > id_idx)
93	0	break;
94	0	}
95	0	prev = ef;
96	0	}
97
98	980	return head;
99	980	}
100
101
102		void
103	122k	_zip_ef_free(zip_extra_field_t *ef) {
104	122k	zip_extra_field_t *ef2;
105
106	186k	while (ef) {
107	64.3k	ef2 = ef->next;
108	64.3k	free(ef->data);
109	64.3k	free(ef);
110	64.3k	ef = ef2;
111	64.3k	}
112	122k	}
113
114
115		const zip_uint8_t *
116	205k	_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) {
117	205k	static const zip_uint8_t empty[1] = {'\0'};
118
119	205k	int i;
120
121	205k	i = 0;
122	303k	for (; ef; ef = ef->next) {
123	118k	if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
124	19.9k	if (i < id_idx) {
125	0	i++;
126	0	continue;
127	0	}
128
129	19.9k	if (lenp)
130	19.9k	*lenp = ef->size;
131	19.9k	if (ef->size > 0)
132	18.9k	return ef->data;
133	959	else
134	959	return empty;
135	19.9k	}
136	118k	}
137
138	185k	zip_error_set(error, ZIP_ER_NOENT, 0);
139	185k	return NULL;
140	205k	}
141
142
143		zip_extra_field_t *
144	0	_zip_ef_merge(zip_extra_field_t to, zip_extra_field_t from) {
145	0	zip_extra_field_t ef2, tt, *tail;
146	0	int duplicate;
147
148	0	if (to == NULL)
149	0	return from;
150
151	0	for (tail = to; tail->next; tail = tail->next)
152	0	;
153
154	0	for (; from; from = ef2) {
155	0	ef2 = from->next;
156
157	0	duplicate = 0;
158	0	for (tt = to; tt; tt = tt->next) {
159	0	if (tt->id == from->id && tt->size == from->size && (tt->size == 0 \|\| memcmp(tt->data, from->data, tt->size) == 0)) {
160	0	tt->flags \|= (from->flags & ZIP_EF_BOTH);
161	0	duplicate = 1;
162	0	break;
163	0	}
164	0	}
165
166	0	from->next = NULL;
167	0	if (duplicate)
168	0	_zip_ef_free(from);
169	0	else
170	0	tail = tail->next = from;
171	0	}
172
173	0	return to;
174	0	}
175
176
177		zip_extra_field_t *
178	64.3k	_zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags) {
179	64.3k	zip_extra_field_t *ef;
180
181	64.3k	if ((ef = (zip_extra_field_t )malloc(sizeof(ef))) == NULL)
182	0	return NULL;
183
184	64.3k	ef->next = NULL;
185	64.3k	ef->flags = flags;
186	64.3k	ef->id = id;
187	64.3k	ef->size = size;
188	64.3k	if (size > 0) {
189	43.6k	if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
190	0	free(ef);
191	0	return NULL;
192	0	}
193	43.6k	}
194	20.6k	else
195	20.6k	ef->data = NULL;
196
197	64.3k	return ef;
198	64.3k	}
199
200
201		bool
202	29.3k	_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) {
203	29.3k	zip_buffer_t *buffer;
204	29.3k	zip_extra_field_t ef, ef2, *ef_head;
205
206	29.3k	if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
207	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
208	0	return false;
209	0	}
210
211	29.3k	ef_head = ef = NULL;
212
213	92.0k	while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
214	62.8k	zip_uint16_t fid, flen;
215	62.8k	zip_uint8_t *ef_data;
216
217	62.8k	fid = _zip_buffer_get_16(buffer);
218	62.8k	flen = _zip_buffer_get_16(buffer);
219	62.8k	ef_data = _zip_buffer_get(buffer, flen);
220
221	62.8k	if (ef_data == NULL) {
222	149	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
223	149	_zip_buffer_free(buffer);
224	149	_zip_ef_free(ef_head);
225	149	return false;
226	149	}
227
228	62.7k	if ((ef2 = _zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
229	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
230	0	_zip_buffer_free(buffer);
231	0	_zip_ef_free(ef_head);
232	0	return false;
233	0	}
234
235	62.7k	if (ef_head) {
236	33.6k	ef->next = ef2;
237	33.6k	ef = ef2;
238	33.6k	}
239	29.0k	else
240	29.0k	ef_head = ef = ef2;
241	62.7k	}
242
243	29.1k	if (!_zip_buffer_eof(buffer)) {
244		/* Android APK files align stored file data with padding in extra fields; ignore. */
245		/* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
246		/* buffer is at most 64k long, so this can't overflow. */
247	3.21k	size_t glen = _zip_buffer_left(buffer);
248	3.21k	zip_uint8_t *garbage;
249	3.21k	garbage = _zip_buffer_get(buffer, glen);
250	3.21k	if (glen >= 4 \|\| garbage == NULL \|\| memcmp(garbage, "\0\0\0", (size_t)glen) != 0) {
251	98	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
252	98	_zip_buffer_free(buffer);
253	98	_zip_ef_free(ef_head);
254	98	return false;
255	98	}
256	3.21k	}
257
258	29.0k	_zip_buffer_free(buffer);
259
260	29.0k	if (ef_head_p) {
261	29.0k	*ef_head_p = ef_head;
262	29.0k	}
263	0	else {
264	0	_zip_ef_free(ef_head);
265	0	}
266
267	29.0k	return true;
268	29.1k	}
269
270
271		zip_extra_field_t *
272	95.5k	_zip_ef_remove_internal(zip_extra_field_t *ef) {
273	95.5k	zip_extra_field_t *ef_head;
274	95.5k	zip_extra_field_t prev, next;
275
276	95.5k	ef_head = ef;
277	95.5k	prev = NULL;
278
279	151k	while (ef) {
280	55.5k	if (ZIP_EF_IS_INTERNAL(ef->id)) {
281	20.8k	next = ef->next;
282	20.8k	if (ef_head == ef)
283	17.8k	ef_head = next;
284	20.8k	ef->next = NULL;
285	20.8k	_zip_ef_free(ef);
286	20.8k	if (prev)
287	3.03k	prev->next = next;
288	20.8k	ef = next;
289	20.8k	}
290	34.6k	else {
291	34.6k	prev = ef;
292	34.6k	ef = ef->next;
293	34.6k	}
294	55.5k	}
295
296	95.5k	return ef_head;
297	95.5k	}
298
299
300		zip_uint16_t
301	5.88k	_zip_ef_size(const zip_extra_field_t *ef, zip_flags_t flags) {
302	5.88k	zip_uint16_t size;
303
304	5.88k	size = 0;
305	7.46k	for (; ef; ef = ef->next) {
306	1.58k	if (ef->flags & flags & ZIP_EF_BOTH)
307	1.58k	size = (zip_uint16_t)(size + 4 + ef->size);
308	1.58k	}
309
310	5.88k	return size;
311	5.88k	}
312
313
314		int
315	1.58k	_zip_ef_write(zip_t za, const zip_extra_field_t ef, zip_flags_t flags) {
316	1.58k	zip_uint8_t b[4];
317	1.58k	zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));
318
319	1.58k	if (buffer == NULL) {
320	0	return -1;
321	0	}
322
323	3.17k	for (; ef; ef = ef->next) {
324	1.58k	if (ef->flags & flags & ZIP_EF_BOTH) {
325	1.58k	_zip_buffer_set_offset(buffer, 0);
326	1.58k	_zip_buffer_put_16(buffer, ef->id);
327	1.58k	_zip_buffer_put_16(buffer, ef->size);
328	1.58k	if (!_zip_buffer_ok(buffer)) {
329	0	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
330	0	_zip_buffer_free(buffer);
331	0	return -1;
332	0	}
333	1.58k	if (_zip_write(za, b, 4) < 0) {
334	0	_zip_buffer_free(buffer);
335	0	return -1;
336	0	}
337	1.58k	if (ef->size > 0) {
338	1.58k	if (_zip_write(za, ef->data, ef->size) < 0) {
339	0	_zip_buffer_free(buffer);
340	0	return -1;
341	0	}
342	1.58k	}
343	1.58k	}
344	1.58k	}
345
346	1.58k	_zip_buffer_free(buffer);
347	1.58k	return 0;
348	1.58k	}
349
350
351		int
352	980	_zip_read_local_ef(zip_t *za, zip_uint64_t idx) {
353	980	zip_entry_t *e;
354	980	unsigned char b[4];
355	980	zip_buffer_t *buffer;
356	980	zip_uint16_t fname_len, ef_len;
357
358	980	if (idx >= za->nentry) {
359	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
360	0	return -1;
361	0	}
362
363	980	e = za->entry + idx;
364
365	980	if (e->orig == NULL \|\| e->orig->local_extra_fields_read)
366	980	return 0;
367
368	0	if (e->orig->offset + 26 > ZIP_INT64_MAX) {
369	0	zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
370	0	return -1;
371	0	}
372
373	0	if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
374	0	zip_error_set_from_source(&za->error, za->src);
375	0	return -1;
376	0	}
377
378	0	if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
379	0	return -1;
380	0	}
381
382	0	fname_len = _zip_buffer_get_16(buffer);
383	0	ef_len = _zip_buffer_get_16(buffer);
384
385	0	if (!_zip_buffer_eof(buffer)) {
386	0	_zip_buffer_free(buffer);
387	0	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
388	0	return -1;
389	0	}
390
391	0	_zip_buffer_free(buffer);
392
393	0	if (ef_len > 0) {
394	0	zip_extra_field_t *ef;
395	0	zip_uint8_t *ef_raw;
396
397	0	if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
398	0	zip_error_set(&za->error, ZIP_ER_SEEK, errno);
399	0	return -1;
400	0	}
401
402	0	ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);
403
404	0	if (ef_raw == NULL)
405	0	return -1;
406
407	0	if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
408	0	free(ef_raw);
409	0	return -1;
410	0	}
411	0	free(ef_raw);
412
413	0	if (ef) {
414	0	ef = _zip_ef_remove_internal(ef);
415	0	e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
416	0	}
417	0	}
418
419	0	e->orig->local_extra_fields_read = 1;
420
421	0	if (e->changes && e->changes->local_extra_fields_read == 0) {
422	0	e->changes->extra_fields = e->orig->extra_fields;
423	0	e->changes->local_extra_fields_read = 1;
424	0	}
425
426	0	return 0;
427	0	}