/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)) == 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_extra_field_t *head, *prev;
    int i;

    i = 0;
    head = ef;
    prev = NULL;
    for (; ef; ef = (prev ? prev->next : head)) {
        if ((ef->id == id) || (id == ZIP_EXTRA_FIELD_ALL)) {
            if (id_idx == ZIP_EXTRA_FIELD_ALL || i == id_idx) {
                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;
    }
}

zip_extra_field_t *_zip_ef_find(zip_extra_field_t *ef_head, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_extra_field_t **prev) {
    zip_extra_field_t *ef;
    zip_uint16_t i;

    i = 0;
    for (ef = ef_head; ef; ef = ef->next) {
        if (ef->id == ef_id) {
            if (i == ef_idx) {
                return ef;
            }
            i++;
        }
        if (prev) {
            *prev = ef;
        }
    }

    return NULL;
}


const zip_uint8_t *_zip_ef_get_by_id(const zip_extra_field_t *ef_head, zip_uint16_t *lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
    static const zip_uint8_t empty[1] = {'\0'};

    zip_extra_field_t *ef = _zip_ef_find((zip_extra_field_t *)ef_head, id, id_idx, NULL);

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

    return NULL;
}

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

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

    ef->next = NULL;
    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)) == 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;
}


/**
 * Calculate the size of the extra fields in bytes.
 *
 * @param ef the extra fields
 * @param flags which extra fields to include (ZIP_EF_LOCAL, ZIP_EF_CENTRAL, or both)
 * @return the size of the extra fields in bytes, or -1 if the size exceeds ZIP_UINT16_MAX.
 */
zip_int32_t _zip_ef_size(const zip_extra_field_t *ef) {
    zip_uint32_t size;

    size = 0;
    for (; ef; ef = ef->next) {
        size = (zip_uint32_t)(size + 4 + ef->size);
        if (size > ZIP_UINT16_MAX) {
            return -1;
        }
    }

    return (zip_int32_t)size;
}


int _zip_ef_write(zip_t *za, const zip_extra_field_t *ef) {
    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) {
        _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.local = 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;
}

void _zip_extrafields_delete_by_id(zip_extra_fields_t *fields, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_flags_t flags) {
    if (flags & ZIP_EF_LOCAL) {
        fields->local = _zip_ef_delete_by_id(fields->local, ef_id, ef_idx);
    }
    if (flags & ZIP_EF_CENTRAL) {
        fields->central = _zip_ef_delete_by_id(fields->central, ef_id, ef_idx);
    }
}

const zip_uint8_t *_zip_extra_fields_get_by_id(const zip_extra_fields_t *extra_fields, zip_uint16_t *lenp, zip_uint16_t extra_field_id, zip_uint16_t extra_field_index, zip_flags_t flags, zip_error_t *error) {
    const zip_uint8_t *data;

    if (flags & ZIP_EF_LOCAL) {
        data = _zip_ef_get_by_id(extra_fields->local, lenp, extra_field_id, extra_field_index, flags);
        if (data) {
            return data;
        }
    }

    if (flags & ZIP_EF_CENTRAL) {
        data = _zip_ef_get_by_id(extra_fields->central, lenp, extra_field_id, extra_field_index, flags);
        if (data) {
            return data;
        }
    }

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

zip_int16_t _zip_ef_count(const zip_extra_field_t *ef, zip_int32_t id) {
    zip_int16_t n;

    n = 0;
    for (; ef; ef = ef->next) {
        if (id < 0 || ef->id == id) {
            n++;
        }
    }

    return n;
}

zip_int16_t _zip_extra_fields_count(const zip_extra_fields_t *extra_fields, zip_int32_t id, zip_flags_t flags) {
    zip_int16_t n;

    n = 0;
    if (flags & ZIP_EF_LOCAL) {
        n += _zip_ef_count(extra_fields->local, id);
    }
    if (flags & ZIP_EF_CENTRAL) {
        n += _zip_ef_count(extra_fields->central, id);
    }

    return n;
}


zip_extra_field_t *_zip_ef_set(zip_extra_field_t *ef_head, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t *data, zip_uint16_t len, zip_error_t *error) {
    zip_extra_field_t *ef_prev = NULL;
    zip_extra_field_t *ef_new, *ef;
    zip_int32_t new_len;

    ef = _zip_ef_find(ef_head, ef_id, ef_idx, &ef_prev);

    if (ef == NULL && ef_idx != ZIP_EXTRA_FIELD_NEW) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    new_len = _zip_ef_size(ef_head);
    /* This should not happen, but we want to assume lengths are >= 0 later. */
    if (new_len < 0) {
        zip_error_set(error, ZIP_ER_EF_TOO_LARGE, 0);
        return NULL;
    }

    if (ef != NULL) {
        new_len -= ef->size + 4;
    }
    new_len += len + 4;

    if (new_len > ZIP_UINT16_MAX) {
        zip_error_set(error, ZIP_ER_EF_TOO_LARGE, 0);
        return NULL;
    }

    if ((ef_new = _zip_ef_new(ef_id, len, data)) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

    if (ef != NULL) {
        ef_new->next = ef->next;
        ef->next = NULL;
        _zip_ef_free(ef);
    }
    else if (ef_prev) {
        ef_new->next = ef_prev->next;
    }

    if (ef_prev) {
        ef_prev->next = ef_new;
    }
    else {
        ef_head = ef_new;
    }

    return ef_head;
}

bool _zip_extra_fields_set(zip_extra_fields_t *extra_fields, zip_flags_t flags, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t *data, zip_uint16_t len, zip_error_t *error) {
    zip_extra_field_t *ef;

    if (flags & ZIP_EF_LOCAL) {
        ef = _zip_ef_set(extra_fields->local, ef_id, ef_idx, data, len, error);
        if (ef == NULL) {
            return false;
        }
        extra_fields->local = ef;
    }
    if (flags & ZIP_EF_CENTRAL) {
        ef = _zip_ef_set(extra_fields->central, ef_id, ef_idx, data, len, error);
        if (ef == NULL) {
            return false;
        }
        extra_fields->central = ef;
    }

    return true;
}

bool _zip_extra_fields_clone(zip_extra_fields_t *extra_fields, zip_error_t *error) {
    if (extra_fields->local) {
        if ((extra_fields->local = _zip_ef_clone(extra_fields->local, error)) == NULL) {
            /* Clear central so we don't refer to the original. */
            extra_fields->central = NULL;
            return false;
        }
    }
    if (extra_fields->central) {
        if ((extra_fields->central = _zip_ef_clone(extra_fields->central, error)) == NULL) {
            return false;
        }
    }

    return true;
}


void _zip_extra_fields_fini(zip_extra_fields_t *extra_fields) {
    _zip_ef_free(extra_fields->local);
    extra_fields->local = NULL;
    _zip_ef_free(extra_fields->central);
    extra_fields->central = NULL;
}

void _zip_extra_fields_init(zip_extra_fields_t *extra_fields) {
    extra_fields->local = NULL;
    extra_fields->central = NULL;
}


void _zip_extra_fields_delete_by_id(zip_extra_fields_t *extra_fields, zip_uint16_t extra_field_id, zip_uint16_t extra_field_index, zip_flags_t flags) {
    if (flags & ZIP_EF_LOCAL) {
        extra_fields->local = _zip_ef_delete_by_id(extra_fields->local, extra_field_id, extra_field_index);
    }
    if (flags & ZIP_EF_CENTRAL) {
        extra_fields->central = _zip_ef_delete_by_id(extra_fields->central, extra_field_id, extra_field_index);
    }
}

Coverage Report

Created: 2026-08-25 06:40

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)) == 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) {
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->id == id) \|\| (id == ZIP_EXTRA_FIELD_ALL)) {
76	0	if (id_idx == ZIP_EXTRA_FIELD_ALL \|\| i == id_idx) {
77	0	if (prev) {
78	0	prev->next = ef->next;
79	0	}
80	0	else {
81	0	head = ef->next;
82	0	}
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	}
96	0	prev = ef;
97	0	}
98
99	0	return head;
100	0	}
101
102
103	63.0k	void _zip_ef_free(zip_extra_field_t *ef) {
104	63.0k	zip_extra_field_t *ef2;
105
106	68.0k	while (ef) {
107	4.96k	ef2 = ef->next;
108	4.96k	free(ef->data);
109	4.96k	free(ef);
110	4.96k	ef = ef2;
111	4.96k	}
112	63.0k	}
113
114	122k	zip_extra_field_t _zip_ef_find(zip_extra_field_t ef_head, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_extra_field_t **prev) {
115	122k	zip_extra_field_t *ef;
116	122k	zip_uint16_t i;
117
118	122k	i = 0;
119	131k	for (ef = ef_head; ef; ef = ef->next) {
120	9.07k	if (ef->id == ef_id) {
121	244	if (i == ef_idx) {
122	244	return ef;
123	244	}
124	0	i++;
125	0	}
126	8.83k	if (prev) {
127	0	*prev = ef;
128	0	}
129	8.83k	}
130
131	122k	return NULL;
132	122k	}
133
134
135	122k	const zip_uint8_t _zip_ef_get_by_id(const zip_extra_field_t ef_head, zip_uint16_t *lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
136	122k	static const zip_uint8_t empty[1] = {'\0'};
137
138	122k	zip_extra_field_t ef = _zip_ef_find((zip_extra_field_t )ef_head, id, id_idx, NULL);
139
140	122k	if (ef) {
141	244	if (lenp) {
142	244	*lenp = ef->size;
143	244	}
144	244	if (ef->size > 0) {
145	175	return ef->data;
146	175	}
147	69	else {
148	69	return empty;
149	69	}
150	244	}
151
152	122k	return NULL;
153	122k	}
154
155	4.96k	zip_extra_field_t _zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t data) {
156	4.96k	zip_extra_field_t *ef;
157
158	4.96k	if ((ef = (zip_extra_field_t )malloc(sizeof(ef))) == NULL) {
159	0	return NULL;
160	0	}
161
162	4.96k	ef->next = NULL;
163	4.96k	ef->id = id;
164	4.96k	ef->size = size;
165	4.96k	if (size > 0) {
166	2.89k	if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
167	0	free(ef);
168	0	return NULL;
169	0	}
170	2.89k	}
171	2.06k	else {
172	2.06k	ef->data = NULL;
173	2.06k	}
174
175	4.96k	return ef;
176	4.96k	}
177
178
179	1.83k	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) {
180	1.83k	zip_buffer_t *buffer;
181	1.83k	zip_extra_field_t ef, ef2, *ef_head;
182
183	1.83k	if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
184	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
185	0	return false;
186	0	}
187
188	1.83k	ef_head = ef = NULL;
189
190	6.80k	while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
191	5.10k	zip_uint16_t fid, flen;
192	5.10k	zip_uint8_t *ef_data;
193
194	5.10k	fid = _zip_buffer_get_16(buffer);
195	5.10k	flen = _zip_buffer_get_16(buffer);
196	5.10k	ef_data = _zip_buffer_get(buffer, flen);
197
198	5.10k	if (ef_data == NULL) {
199	140	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
200	140	_zip_buffer_free(buffer);
201	140	_zip_ef_free(ef_head);
202	140	return false;
203	140	}
204
205	4.96k	if ((ef2 = _zip_ef_new(fid, flen, ef_data)) == NULL) {
206	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
207	0	_zip_buffer_free(buffer);
208	0	_zip_ef_free(ef_head);
209	0	return false;
210	0	}
211
212	4.96k	if (ef_head) {
213	3.24k	ef->next = ef2;
214	3.24k	ef = ef2;
215	3.24k	}
216	1.72k	else {
217	1.72k	ef_head = ef = ef2;
218	1.72k	}
219	4.96k	}
220
221	1.69k	if (!_zip_buffer_eof(buffer)) {
222		/* Android APK files align stored file data with padding in extra fields; ignore. */
223		/* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
224		/* buffer is at most 64k long, so this can't overflow. */
225	361	size_t glen = _zip_buffer_left(buffer);
226	361	zip_uint8_t *garbage;
227	361	garbage = _zip_buffer_get(buffer, glen);
228	361	if (glen >= 4 \|\| garbage == NULL \|\| memcmp(garbage, "\0\0\0", (size_t)glen) != 0) {
229	71	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
230	71	_zip_buffer_free(buffer);
231	71	_zip_ef_free(ef_head);
232	71	return false;
233	71	}
234	361	}
235
236	1.62k	_zip_buffer_free(buffer);
237
238	1.62k	if (ef_head_p) {
239	1.62k	*ef_head_p = ef_head;
240	1.62k	}
241	0	else {
242	0	_zip_ef_free(ef_head);
243	0	}
244
245	1.62k	return true;
246	1.69k	}
247
248
249	30.3k	zip_extra_field_t _zip_ef_remove_internal(zip_extra_field_t ef) {
250	30.3k	zip_extra_field_t *ef_head;
251	30.3k	zip_extra_field_t prev, next;
252
253	30.3k	ef_head = ef;
254	30.3k	prev = NULL;
255
256	33.8k	while (ef) {
257	3.53k	if (ZIP_EF_IS_INTERNAL(ef->id)) {
258	113	next = ef->next;
259	113	if (ef_head == ef) {
260	36	ef_head = next;
261	36	}
262	113	ef->next = NULL;
263	113	_zip_ef_free(ef);
264	113	if (prev) {
265	77	prev->next = next;
266	77	}
267	113	ef = next;
268	113	}
269	3.42k	else {
270	3.42k	prev = ef;
271	3.42k	ef = ef->next;
272	3.42k	}
273	3.53k	}
274
275	30.3k	return ef_head;
276	30.3k	}
277
278
279		/**
280		* Calculate the size of the extra fields in bytes.
281		*
282		* @param ef the extra fields
283		* @param flags which extra fields to include (ZIP_EF_LOCAL, ZIP_EF_CENTRAL, or both)
284		* @return the size of the extra fields in bytes, or -1 if the size exceeds ZIP_UINT16_MAX.
285		*/
286	0	zip_int32_t _zip_ef_size(const zip_extra_field_t *ef) {
287	0	zip_uint32_t size;
288
289	0	size = 0;
290	0	for (; ef; ef = ef->next) {
291	0	size = (zip_uint32_t)(size + 4 + ef->size);
292	0	if (size > ZIP_UINT16_MAX) {
293	0	return -1;
294	0	}
295	0	}
296
297	0	return (zip_int32_t)size;
298	0	}
299
300
301	0	int _zip_ef_write(zip_t za, const zip_extra_field_t ef) {
302	0	zip_uint8_t b[4];
303	0	zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));
304
305	0	if (buffer == NULL) {
306	0	return -1;
307	0	}
308
309	0	for (; ef; ef = ef->next) {
310	0	_zip_buffer_set_offset(buffer, 0);
311	0	_zip_buffer_put_16(buffer, ef->id);
312	0	_zip_buffer_put_16(buffer, ef->size);
313	0	if (!_zip_buffer_ok(buffer)) {
314	0	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
315	0	_zip_buffer_free(buffer);
316	0	return -1;
317	0	}
318	0	if (_zip_write(za, b, 4) < 0) {
319	0	_zip_buffer_free(buffer);
320	0	return -1;
321	0	}
322	0	if (ef->size > 0) {
323	0	if (_zip_write(za, ef->data, ef->size) < 0) {
324	0	_zip_buffer_free(buffer);
325	0	return -1;
326	0	}
327	0	}
328	0	}
329
330	0	_zip_buffer_free(buffer);
331	0	return 0;
332	0	}
333
334
335	0	int _zip_read_local_ef(zip_t *za, zip_uint64_t idx) {
336	0	zip_entry_t *e;
337	0	unsigned char b[4];
338	0	zip_buffer_t *buffer;
339	0	zip_uint16_t fname_len, ef_len;
340
341	0	if (idx >= za->nentry) {
342	0	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
343	0	return -1;
344	0	}
345
346	0	e = za->entry + idx;
347
348	0	if (e->orig == NULL \|\| e->orig->local_extra_fields_read) {
349	0	return 0;
350	0	}
351
352	0	if (e->orig->offset + 26 > ZIP_INT64_MAX) {
353	0	zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
354	0	return -1;
355	0	}
356
357	0	if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
358	0	zip_error_set_from_source(&za->error, za->src);
359	0	return -1;
360	0	}
361
362	0	if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
363	0	return -1;
364	0	}
365
366	0	fname_len = _zip_buffer_get_16(buffer);
367	0	ef_len = _zip_buffer_get_16(buffer);
368
369	0	if (!_zip_buffer_eof(buffer)) {
370	0	_zip_buffer_free(buffer);
371	0	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
372	0	return -1;
373	0	}
374
375	0	_zip_buffer_free(buffer);
376
377	0	if (ef_len > 0) {
378	0	zip_extra_field_t *ef;
379	0	zip_uint8_t *ef_raw;
380
381	0	if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
382	0	zip_error_set(&za->error, ZIP_ER_SEEK, errno);
383	0	return -1;
384	0	}
385
386	0	ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);
387
388	0	if (ef_raw == NULL) {
389	0	return -1;
390	0	}
391
392	0	if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
393	0	free(ef_raw);
394	0	return -1;
395	0	}
396	0	free(ef_raw);
397
398	0	if (ef) {
399	0	ef = _zip_ef_remove_internal(ef);
400	0	e->orig->extra_fields.local = ef;
401	0	}
402	0	}
403
404	0	e->orig->local_extra_fields_read = 1;
405
406	0	if (e->changes && e->changes->local_extra_fields_read == 0) {
407	0	e->changes->extra_fields = e->orig->extra_fields;
408	0	e->changes->local_extra_fields_read = 1;
409	0	}
410
411	0	return 0;
412	0	}
413
414	0	void _zip_extrafields_delete_by_id(zip_extra_fields_t *fields, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_flags_t flags) {
415	0	if (flags & ZIP_EF_LOCAL) {
416	0	fields->local = _zip_ef_delete_by_id(fields->local, ef_id, ef_idx);
417	0	}
418	0	if (flags & ZIP_EF_CENTRAL) {
419	0	fields->central = _zip_ef_delete_by_id(fields->central, ef_id, ef_idx);
420	0	}
421	0	}
422
423	61.7k	const zip_uint8_t _zip_extra_fields_get_by_id(const zip_extra_fields_t extra_fields, zip_uint16_t lenp, zip_uint16_t extra_field_id, zip_uint16_t extra_field_index, zip_flags_t flags, zip_error_t error) {
424	61.7k	const zip_uint8_t *data;
425
426	61.7k	if (flags & ZIP_EF_LOCAL) {
427	61.1k	data = _zip_ef_get_by_id(extra_fields->local, lenp, extra_field_id, extra_field_index, flags);
428	61.1k	if (data) {
429	0	return data;
430	0	}
431	61.1k	}
432
433	61.7k	if (flags & ZIP_EF_CENTRAL) {
434	61.7k	data = _zip_ef_get_by_id(extra_fields->central, lenp, extra_field_id, extra_field_index, flags);
435	61.7k	if (data) {
436	244	return data;
437	244	}
438	61.7k	}
439
440	61.4k	zip_error_set(error, ZIP_ER_NOENT, 0);
441	61.4k	return NULL;
442	61.7k	}
443
444	0	zip_int16_t _zip_ef_count(const zip_extra_field_t *ef, zip_int32_t id) {
445	0	zip_int16_t n;
446
447	0	n = 0;
448	0	for (; ef; ef = ef->next) {
449	0	if (id < 0 \|\| ef->id == id) {
450	0	n++;
451	0	}
452	0	}
453
454	0	return n;
455	0	}
456
457	0	zip_int16_t _zip_extra_fields_count(const zip_extra_fields_t *extra_fields, zip_int32_t id, zip_flags_t flags) {
458	0	zip_int16_t n;
459
460	0	n = 0;
461	0	if (flags & ZIP_EF_LOCAL) {
462	0	n += _zip_ef_count(extra_fields->local, id);
463	0	}
464	0	if (flags & ZIP_EF_CENTRAL) {
465	0	n += _zip_ef_count(extra_fields->central, id);
466	0	}
467
468	0	return n;
469	0	}
470
471
472	0	zip_extra_field_t _zip_ef_set(zip_extra_field_t ef_head, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t data, zip_uint16_t len, zip_error_t error) {
473	0	zip_extra_field_t *ef_prev = NULL;
474	0	zip_extra_field_t ef_new, ef;
475	0	zip_int32_t new_len;
476
477	0	ef = _zip_ef_find(ef_head, ef_id, ef_idx, &ef_prev);
478
479	0	if (ef == NULL && ef_idx != ZIP_EXTRA_FIELD_NEW) {
480	0	zip_error_set(error, ZIP_ER_INVAL, 0);
481	0	return NULL;
482	0	}
483
484	0	new_len = _zip_ef_size(ef_head);
485		/* This should not happen, but we want to assume lengths are >= 0 later. */
486	0	if (new_len < 0) {
487	0	zip_error_set(error, ZIP_ER_EF_TOO_LARGE, 0);
488	0	return NULL;
489	0	}
490
491	0	if (ef != NULL) {
492	0	new_len -= ef->size + 4;
493	0	}
494	0	new_len += len + 4;
495
496	0	if (new_len > ZIP_UINT16_MAX) {
497	0	zip_error_set(error, ZIP_ER_EF_TOO_LARGE, 0);
498	0	return NULL;
499	0	}
500
501	0	if ((ef_new = _zip_ef_new(ef_id, len, data)) == NULL) {
502	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
503	0	return NULL;
504	0	}
505
506	0	if (ef != NULL) {
507	0	ef_new->next = ef->next;
508	0	ef->next = NULL;
509	0	_zip_ef_free(ef);
510	0	}
511	0	else if (ef_prev) {
512	0	ef_new->next = ef_prev->next;
513	0	}
514
515	0	if (ef_prev) {
516	0	ef_prev->next = ef_new;
517	0	}
518	0	else {
519	0	ef_head = ef_new;
520	0	}
521
522	0	return ef_head;
523	0	}
524
525	0	bool _zip_extra_fields_set(zip_extra_fields_t extra_fields, zip_flags_t flags, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t data, zip_uint16_t len, zip_error_t *error) {
526	0	zip_extra_field_t *ef;
527
528	0	if (flags & ZIP_EF_LOCAL) {
529	0	ef = _zip_ef_set(extra_fields->local, ef_id, ef_idx, data, len, error);
530	0	if (ef == NULL) {
531	0	return false;
532	0	}
533	0	extra_fields->local = ef;
534	0	}
535	0	if (flags & ZIP_EF_CENTRAL) {
536	0	ef = _zip_ef_set(extra_fields->central, ef_id, ef_idx, data, len, error);
537	0	if (ef == NULL) {
538	0	return false;
539	0	}
540	0	extra_fields->central = ef;
541	0	}
542
543	0	return true;
544	0	}
545
546	0	bool _zip_extra_fields_clone(zip_extra_fields_t extra_fields, zip_error_t error) {
547	0	if (extra_fields->local) {
548	0	if ((extra_fields->local = _zip_ef_clone(extra_fields->local, error)) == NULL) {
549		/* Clear central so we don't refer to the original. */
550	0	extra_fields->central = NULL;
551	0	return false;
552	0	}
553	0	}
554	0	if (extra_fields->central) {
555	0	if ((extra_fields->central = _zip_ef_clone(extra_fields->central, error)) == NULL) {
556	0	return false;
557	0	}
558	0	}
559
560	0	return true;
561	0	}
562
563
564	31.3k	void _zip_extra_fields_fini(zip_extra_fields_t *extra_fields) {
565	31.3k	_zip_ef_free(extra_fields->local);
566	31.3k	extra_fields->local = NULL;
567	31.3k	_zip_ef_free(extra_fields->central);
568	31.3k	extra_fields->central = NULL;
569	31.3k	}
570
571	93.4k	void _zip_extra_fields_init(zip_extra_fields_t *extra_fields) {
572	93.4k	extra_fields->local = NULL;
573	93.4k	extra_fields->central = NULL;
574	93.4k	}
575
576
577	0	void _zip_extra_fields_delete_by_id(zip_extra_fields_t *extra_fields, zip_uint16_t extra_field_id, zip_uint16_t extra_field_index, zip_flags_t flags) {
578	0	if (flags & ZIP_EF_LOCAL) {
579	0	extra_fields->local = _zip_ef_delete_by_id(extra_fields->local, extra_field_id, extra_field_index);
580	0	}
581	0	if (flags & ZIP_EF_CENTRAL) {
582	0	extra_fields->central = _zip_ef_delete_by_id(extra_fields->central, extra_field_id, extra_field_index);
583	0	}
584	0	}