/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 we are updating an existing field with its current data pointer, just update the size.
       This also ensures that data remains valid, which is needed if we set both local and central extra fields. */
    if (ef && ef->data == data) {
        /* Since ef->data can be user supplied, we don't know its allocation size, so a bigger len may be fine. */
        ef->size = len;
        return ef_head;
    }

    /* Otherwise, create a new extra field. */
    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: 2026-10-14 06:52

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	59.7k	void _zip_ef_free(zip_extra_field_t *ef) {
104	59.7k	zip_extra_field_t *ef2;
105
106	64.7k	while (ef) {
107	4.99k	ef2 = ef->next;
108	4.99k	free(ef->data);
109	4.99k	free(ef);
110	4.99k	ef = ef2;
111	4.99k	}
112	59.7k	}
113
114	115k	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	115k	zip_extra_field_t *ef;
116	115k	zip_uint16_t i;
117
118	115k	i = 0;
119	125k	for (ef = ef_head; ef; ef = ef->next) {
120	9.59k	if (ef->id == ef_id) {
121	322	if (i == ef_idx) {
122	322	return ef;
123	322	}
124	0	i++;
125	0	}
126	9.27k	if (prev) {
127	0	*prev = ef;
128	0	}
129	9.27k	}
130
131	115k	return NULL;
132	115k	}
133
134
135	115k	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	115k	static const zip_uint8_t empty[1] = {'\0'};
137
138	115k	zip_extra_field_t ef = _zip_ef_find((zip_extra_field_t )ef_head, id, id_idx, NULL);
139
140	115k	if (ef) {
141	322	if (lenp) {
142	322	*lenp = ef->size;
143	322	}
144	322	if (ef->size > 0) {
145	137	return ef->data;
146	137	}
147	185	else {
148	185	return empty;
149	185	}
150	322	}
151
152	115k	return NULL;
153	115k	}
154
155	4.99k	zip_extra_field_t _zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t data) {
156	4.99k	zip_extra_field_t *ef;
157
158	4.99k	if ((ef = (zip_extra_field_t )malloc(sizeof(ef))) == NULL) {
159	0	return NULL;
160	0	}
161
162	4.99k	ef->next = NULL;
163	4.99k	ef->id = id;
164	4.99k	ef->size = size;
165	4.99k	if (size > 0) {
166	2.41k	if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
167	0	free(ef);
168	0	return NULL;
169	0	}
170	2.41k	}
171	2.58k	else {
172	2.58k	ef->data = NULL;
173	2.58k	}
174
175	4.99k	return ef;
176	4.99k	}
177
178
179	1.67k	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	1.67k	zip_buffer_t *buffer;
181	1.67k	zip_extra_field_t ef, ef2, *ef_head;
182
183	1.67k	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	1.67k	ef_head = ef = NULL;
189
190	6.66k	while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
191	5.12k	zip_uint16_t fid, flen;
192	5.12k	zip_uint8_t *ef_data;
193
194	5.12k	fid = _zip_buffer_get_16(buffer);
195	5.12k	flen = _zip_buffer_get_16(buffer);
196	5.12k	ef_data = _zip_buffer_get(buffer, flen);
197
198	5.12k	if (ef_data == NULL) {
199	127	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
200	127	_zip_buffer_free(buffer);
201	127	_zip_ef_free(ef_head);
202	127	return false;
203	127	}
204
205	4.99k	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	4.99k	if (ef_head) {
213	3.40k	ef->next = ef2;
214	3.40k	ef = ef2;
215	3.40k	}
216	1.58k	else {
217	1.58k	ef_head = ef = ef2;
218	1.58k	}
219	4.99k	}
220
221	1.54k	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	422	size_t glen = _zip_buffer_left(buffer);
226	422	zip_uint8_t *garbage;
227	422	garbage = _zip_buffer_get(buffer, glen);
228	422	if (glen >= 4 \|\| garbage == NULL \|\| memcmp(garbage, "\0\0\0", (size_t)glen) != 0) {
229	66	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
230	66	_zip_buffer_free(buffer);
231	66	_zip_ef_free(ef_head);
232	66	return false;
233	66	}
234	422	}
235
236	1.48k	_zip_buffer_free(buffer);
237
238	1.48k	if (ef_head_p) {
239	1.48k	*ef_head_p = ef_head;
240	1.48k	}
241	0	else {
242	0	_zip_ef_free(ef_head);
243	0	}
244
245	1.48k	return true;
246	1.54k	}
247
248
249	28.6k	zip_extra_field_t _zip_ef_remove_internal(zip_extra_field_t ef) {
250	28.6k	zip_extra_field_t *ef_head;
251	28.6k	zip_extra_field_t prev, next;
252
253	28.6k	ef_head = ef;
254	28.6k	prev = NULL;
255
256	32.4k	while (ef) {
257	3.81k	if (ZIP_EF_IS_INTERNAL(ef->id)) {
258	158	next = ef->next;
259	158	if (ef_head == ef) {
260	41	ef_head = next;
261	41	}
262	158	ef->next = NULL;
263	158	_zip_ef_free(ef);
264	158	if (prev) {
265	117	prev->next = next;
266	117	}
267	158	ef = next;
268	158	}
269	3.65k	else {
270	3.65k	prev = ef;
271	3.65k	ef = ef->next;
272	3.65k	}
273	3.81k	}
274
275	28.6k	return ef_head;
276	28.6k	}
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	58.1k	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	58.1k	const zip_uint8_t *data;
425
426	58.1k	if (flags & ZIP_EF_LOCAL) {
427	57.7k	data = _zip_ef_get_by_id(extra_fields->local, lenp, extra_field_id, extra_field_index, flags);
428	57.7k	if (data) {
429	0	return data;
430	0	}
431	57.7k	}
432
433	58.1k	if (flags & ZIP_EF_CENTRAL) {
434	58.1k	data = _zip_ef_get_by_id(extra_fields->central, lenp, extra_field_id, extra_field_index, flags);
435	58.1k	if (data) {
436	322	return data;
437	322	}
438	58.1k	}
439
440	57.8k	zip_error_set(error, ZIP_ER_NOENT, 0);
441	57.8k	return NULL;
442	58.1k	}
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		/* If we are updating an existing field with its current data pointer, just update the size.
502		This also ensures that data remains valid, which is needed if we set both local and central extra fields. */
503	0	if (ef && ef->data == data) {
504		/* Since ef->data can be user supplied, we don't know its allocation size, so a bigger len may be fine. */
505	0	ef->size = len;
506	0	return ef_head;
507	0	}
508
509		/* Otherwise, create a new extra field. */
510	0	if ((ef_new = _zip_ef_new(ef_id, len, data)) == NULL) {
511	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
512	0	return NULL;
513	0	}
514
515	0	if (ef != NULL) {
516	0	ef_new->next = ef->next;
517	0	ef->next = NULL;
518	0	_zip_ef_free(ef);
519	0	}
520	0	else if (ef_prev) {
521	0	ef_new->next = ef_prev->next;
522	0	}
523
524	0	if (ef_prev) {
525	0	ef_prev->next = ef_new;
526	0	}
527	0	else {
528	0	ef_head = ef_new;
529	0	}
530
531	0	return ef_head;
532	0	}
533
534	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) {
535	0	zip_extra_field_t *ef;
536
537	0	if (flags & ZIP_EF_LOCAL) {
538	0	ef = _zip_ef_set(extra_fields->local, ef_id, ef_idx, data, len, error);
539	0	if (ef == NULL) {
540	0	return false;
541	0	}
542	0	extra_fields->local = ef;
543	0	}
544	0	if (flags & ZIP_EF_CENTRAL) {
545	0	ef = _zip_ef_set(extra_fields->central, ef_id, ef_idx, data, len, error);
546	0	if (ef == NULL) {
547	0	return false;
548	0	}
549	0	extra_fields->central = ef;
550	0	}
551
552	0	return true;
553	0	}
554
555	0	bool _zip_extra_fields_clone(zip_extra_fields_t extra_fields, zip_error_t error) {
556	0	if (extra_fields->local) {
557	0	if ((extra_fields->local = _zip_ef_clone(extra_fields->local, error)) == NULL) {
558		/* Clear central so we don't refer to the original. */
559	0	extra_fields->central = NULL;
560	0	return false;
561	0	}
562	0	}
563	0	if (extra_fields->central) {
564	0	if ((extra_fields->central = _zip_ef_clone(extra_fields->central, error)) == NULL) {
565	0	return false;
566	0	}
567	0	}
568
569	0	return true;
570	0	}
571
572
573	29.7k	void _zip_extra_fields_fini(zip_extra_fields_t *extra_fields) {
574	29.7k	_zip_ef_free(extra_fields->local);
575	29.7k	extra_fields->local = NULL;
576	29.7k	_zip_ef_free(extra_fields->central);
577	29.7k	extra_fields->central = NULL;
578	29.7k	}
579
580	88.4k	void _zip_extra_fields_init(zip_extra_fields_t *extra_fields) {
581	88.4k	extra_fields->local = NULL;
582	88.4k	extra_fields->central = NULL;
583	88.4k	}
584
585
586	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) {
587	0	if (flags & ZIP_EF_LOCAL) {
588	0	extra_fields->local = _zip_ef_delete_by_id(extra_fields->local, extra_field_id, extra_field_index);
589	0	}
590	0	if (flags & ZIP_EF_CENTRAL) {
591	0	extra_fields->central = _zip_ef_delete_by_id(extra_fields->central, extra_field_id, extra_field_index);
592	0	}
593	0	}