1 /*
2 zip_fopen_index_encrypted.c -- open file for reading by index w/ password
3 Copyright (C) 1999-2009 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
36 #include <errno.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39
40 #include "zipint.h"
41
42 static struct zip_file *_zip_file_new(struct zip *za);
43
44
45
46 ZIP_EXTERN(struct zip_file *)
zip_fopen_index_encrypted(struct zip * za,zip_uint64_t fileno,int flags,const char * password)47 zip_fopen_index_encrypted(struct zip *za, zip_uint64_t fileno, int flags,
48 const char *password)
49 {
50 struct zip_file *zf;
51 zip_compression_implementation comp_impl;
52 zip_encryption_implementation enc_impl;
53 struct zip_source *src, *s2;
54 zip_uint64_t start;
55 struct zip_stat st;
56
57 if (fileno >= za->nentry) {
58 _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
59 return NULL;
60 }
61
62 if ((flags & ZIP_FL_UNCHANGED) == 0
63 && ZIP_ENTRY_DATA_CHANGED(za->entry+fileno)) {
64 _zip_error_set(&za->error, ZIP_ER_CHANGED, 0);
65 return NULL;
66 }
67
68 if (fileno >= za->cdir->nentry) {
69 _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
70 return NULL;
71 }
72
73 if (flags & ZIP_FL_ENCRYPTED)
74 flags |= ZIP_FL_COMPRESSED;
75
76 zip_stat_index(za, fileno, flags, &st);
77
78 enc_impl = NULL;
79 if ((flags & ZIP_FL_ENCRYPTED) == 0) {
80 if (st.encryption_method != ZIP_EM_NONE) {
81 if (password == NULL) {
82 _zip_error_set(&za->error, ZIP_ER_NOPASSWD, 0);
83 return NULL;
84 }
85 if ((enc_impl=zip_get_encryption_implementation(
86 st.encryption_method)) == NULL) {
87 _zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
88 return NULL;
89 }
90 }
91 }
92
93 comp_impl = NULL;
94 if ((flags & ZIP_FL_COMPRESSED) == 0) {
95 if (st.comp_method != ZIP_CM_STORE) {
96 if ((comp_impl=zip_get_compression_implementation(
97 st.comp_method)) == NULL) {
98 _zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
99 return NULL;
100 }
101 }
102 }
103
104 if ((start=_zip_file_get_offset(za, fileno)) == 0)
105 return NULL;
106
107 if (st.comp_size == 0) {
108 if ((src=zip_source_buffer(za, NULL, 0, 0)) == NULL)
109 return NULL;
110 }
111 else {
112 if ((src=_zip_source_file_or_p(za, NULL, za->zp, start, st.comp_size,
113 0, &st)) == NULL)
114 return NULL;
115 if (enc_impl) {
116 if ((s2=enc_impl(za, src, ZIP_EM_TRAD_PKWARE, 0,
117 password)) == NULL) {
118 zip_source_free(src);
119 /* XXX: set error (how?) */
120 return NULL;
121 }
122 src = s2;
123 }
124 if (comp_impl) {
125 if ((s2=comp_impl(za, src, za->cdir->entry[fileno].comp_method,
126 0)) == NULL) {
127 zip_source_free(src);
128 /* XXX: set error (how?) */
129 return NULL;
130 }
131 src = s2;
132 }
133 if ((flags & ZIP_FL_COMPRESSED) == 0
134 || st.comp_method == ZIP_CM_STORE ) {
135 if ((s2=zip_source_crc(za, src, 1)) == NULL) {
136 zip_source_free(src);
137 /* XXX: set error (how?) */
138 return NULL;
139 }
140 src = s2;
141 }
142 }
143
144 if (zip_source_open(src) < 0) {
145 _zip_error_set_from_source(&za->error, src);
146 zip_source_free(src);
147 return NULL;
148 }
149
150 zf = _zip_file_new(za);
151
152 zf->src = src;
153
154 return zf;
155 }
156
157
158
159 static struct zip_file *
_zip_file_new(struct zip * za)160 _zip_file_new(struct zip *za)
161 {
162 struct zip_file *zf, **file;
163 int n;
164
165 if ((zf=(struct zip_file *)malloc(sizeof(struct zip_file))) == NULL) {
166 _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
167 return NULL;
168 }
169
170 if (za->nfile >= za->nfile_alloc-1) {
171 n = za->nfile_alloc + 10;
172 file = (struct zip_file **)realloc(za->file,
173 n*sizeof(struct zip_file *));
174 if (file == NULL) {
175 _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
176 free(zf);
177 return NULL;
178 }
179 za->nfile_alloc = n;
180 za->file = file;
181 }
182
183 za->file[za->nfile++] = zf;
184
185 zf->za = za;
186 _zip_error_init(&zf->error);
187 zf->eof = 0;
188 zf->src = NULL;
189
190 return zf;
191 }
192
