1 /*
2 zip_set_name.c -- rename helper function
3 Copyright (C) 1999-2015 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 <libzip@nih.at>
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 <stdlib.h>
36 #include <string.h>
37
38 #include "zipint.h"
39
40
41 int
_zip_set_name(zip_t * za,zip_uint64_t idx,const char * name,zip_flags_t flags)42 _zip_set_name(zip_t *za, zip_uint64_t idx, const char *name, zip_flags_t flags)
43 {
44 zip_entry_t *e;
45 zip_string_t *str;
46 bool same_as_orig;
47 zip_int64_t i;
48 const zip_uint8_t *old_name, *new_name;
49 zip_string_t *old_str;
50
51 if (idx >= za->nentry) {
52 zip_error_set(&za->error, ZIP_ER_INVAL, 0);
53 return -1;
54 }
55
56 if (ZIP_IS_RDONLY(za)) {
57 zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
58 return -1;
59 }
60
61 if (name && name[0] != '\0') {
62 /* TODO: check for string too long */
63 if ((str=_zip_string_new((const zip_uint8_t *)name, (zip_uint16_t)strlen(name), flags, &za->error)) == NULL)
64 return -1;
65 if ((flags & ZIP_FL_ENCODING_ALL) == ZIP_FL_ENC_GUESS && _zip_guess_encoding(str, ZIP_ENCODING_UNKNOWN) == ZIP_ENCODING_UTF8_GUESSED)
66 str->encoding = ZIP_ENCODING_UTF8_KNOWN;
67 }
68 else
69 str = NULL;
70
71 /* TODO: encoding flags needed for CP437? */
72 if ((i=_zip_name_locate(za, name, 0, NULL)) >= 0 && (zip_uint64_t)i != idx) {
73 _zip_string_free(str);
74 zip_error_set(&za->error, ZIP_ER_EXISTS, 0);
75 return -1;
76 }
77
78 /* no effective name change */
79 if (i>=0 && (zip_uint64_t)i == idx) {
80 _zip_string_free(str);
81 return 0;
82 }
83
84 e = za->entry+idx;
85
86 if (e->orig)
87 same_as_orig = _zip_string_equal(e->orig->filename, str);
88 else
89 same_as_orig = false;
90
91 if (!same_as_orig && e->changes == NULL) {
92 if ((e->changes=_zip_dirent_clone(e->orig)) == NULL) {
93 zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
94 _zip_string_free(str);
95 return -1;
96 }
97 }
98
99 if ((new_name = _zip_string_get(same_as_orig ? e->orig->filename : str, NULL, 0, &za->error)) == NULL) {
100 _zip_string_free(str);
101 return -1;
102 }
103
104 if (e->changes) {
105 old_str = e->changes->filename;
106 }
107 else if (e->orig) {
108 old_str = e->orig->filename;
109 }
110 else {
111 old_str = NULL;
112 }
113
114 if (old_str) {
115 if ((old_name = _zip_string_get(old_str, NULL, 0, &za->error)) == NULL) {
116 _zip_string_free(str);
117 return -1;
118 }
119 }
120 else {
121 old_name = NULL;
122 }
123
124 if (_zip_hash_add(za->names, new_name, idx, 0, &za->error) == false) {
125 _zip_string_free(str);
126 return -1;
127 }
128 if (old_name) {
129 _zip_hash_delete(za->names, old_name, NULL);
130 }
131
132 if (same_as_orig) {
133 if (e->changes) {
134 if (e->changes->changed & ZIP_DIRENT_FILENAME) {
135 _zip_string_free(e->changes->filename);
136 e->changes->changed &= ~ZIP_DIRENT_FILENAME;
137 if (e->changes->changed == 0) {
138 _zip_dirent_free(e->changes);
139 e->changes = NULL;
140 }
141 else {
142 /* TODO: what if not cloned? can that happen? */
143 e->changes->filename = e->orig->filename;
144 }
145 }
146 }
147 _zip_string_free(str);
148 }
149 else {
150 if (e->changes->changed & ZIP_DIRENT_FILENAME) {
151 _zip_string_free(e->changes->filename);
152 }
153 e->changes->changed |= ZIP_DIRENT_FILENAME;
154 e->changes->filename = str;
155 }
156
157 return 0;
158 }
159
