1 /*
2 zip_source_filep.c -- create data source from FILE *
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 <sys/stat.h>
37 #include <errno.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41
42 #include "zipint.h"
43
44 struct read_file {
45 char *fname; /* name of file to copy from */
46 FILE *f; /* file to copy from */
47 int closep; /* close f */
48 struct zip_stat st; /* stat information passed in */
49
50 zip_uint64_t off; /* start offset of */
51 zip_int64_t len; /* length of data to copy */
52 zip_int64_t remain; /* bytes remaining to be copied */
53 int e[2]; /* error codes */
54 };
55
56 static zip_int64_t read_file(void *state, void *data, zip_uint64_t len,
57 enum zip_source_cmd cmd);
58
59
60
61 ZIP_EXTERN(struct zip_source *)
zip_source_filep(struct zip * za,FILE * file,zip_uint64_t start,zip_int64_t len)62 zip_source_filep(struct zip *za, FILE *file, zip_uint64_t start,
63 zip_int64_t len)
64 {
65 if (za == NULL)
66 return NULL;
67
68 if (file == NULL || start < 0 || len < -1) {
69 _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
70 return NULL;
71 }
72
73 return _zip_source_file_or_p(za, NULL, file, start, len, 1, NULL);
74 }
75
76
77
78 struct zip_source *
_zip_source_file_or_p(struct zip * za,const char * fname,FILE * file,zip_uint64_t start,zip_int64_t len,int closep,const struct zip_stat * st)79 _zip_source_file_or_p(struct zip *za, const char *fname, FILE *file,
80 zip_uint64_t start, zip_int64_t len, int closep,
81 const struct zip_stat *st)
82 {
83 struct read_file *f;
84 struct zip_source *zs;
85
86 if (file == NULL && fname == NULL) {
87 _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
88 return NULL;
89 }
90
91 if ((f=(struct read_file *)malloc(sizeof(struct read_file))) == NULL) {
92 _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
93 return NULL;
94 }
95
96 f->fname = NULL;
97 if (fname) {
98 if ((f->fname=strdup(fname)) == NULL) {
99 _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
100 free(f);
101 return NULL;
102 }
103 }
104 f->f = file;
105 f->off = start;
106 f->len = (len ? len : -1);
107 f->closep = f->fname ? 1 : closep;
108 if (st)
109 memcpy(&f->st, st, sizeof(f->st));
110 else
111 zip_stat_init(&f->st);
112
113 if ((zs=zip_source_function(za, read_file, f)) == NULL) {
114 free(f);
115 return NULL;
116 }
117
118 return zs;
119 }
120
121
122
123 static zip_int64_t
read_file(void * state,void * data,zip_uint64_t len,enum zip_source_cmd cmd)124 read_file(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
125 {
126 struct read_file *z;
127 char *buf;
128 int i, n;
129
130 z = (struct read_file *)state;
131 buf = (char *)data;
132
133 switch (cmd) {
134 case ZIP_SOURCE_OPEN:
135 if (z->fname) {
136 if ((z->f=fopen(z->fname, "rb")) == NULL) {
137 z->e[0] = ZIP_ER_OPEN;
138 z->e[1] = errno;
139 return -1;
140 }
141 }
142
143 if (z->closep) {
144 if (fseeko(z->f, (off_t)z->off, SEEK_SET) < 0) {
145 z->e[0] = ZIP_ER_SEEK;
146 z->e[1] = errno;
147 return -1;
148 }
149 }
150 z->remain = z->len;
151 return 0;
152
153 case ZIP_SOURCE_READ:
154 /* XXX: return INVAL if len > size_t max */
155 if (z->remain != -1)
156 n = len > z->remain ? z->remain : len;
157 else
158 n = len;
159
160 if (!z->closep) {
161 /* we might share this file with others, so let's be safe */
162 if (fseeko(z->f, (off_t)(z->off + z->len-z->remain),
163 SEEK_SET) < 0) {
164 z->e[0] = ZIP_ER_SEEK;
165 z->e[1] = errno;
166 return -1;
167 }
168 }
169
170 if ((i=fread(buf, 1, n, z->f)) < 0) {
171 z->e[0] = ZIP_ER_READ;
172 z->e[1] = errno;
173 return -1;
174 }
175
176 if (z->remain != -1)
177 z->remain -= i;
178
179 return i;
180
181 case ZIP_SOURCE_CLOSE:
182 if (z->fname) {
183 fclose(z->f);
184 z->f = NULL;
185 }
186 return 0;
187
188 case ZIP_SOURCE_STAT:
189 {
190 if (len < sizeof(z->st))
191 return -1;
192
193 if (z->st.valid != 0)
194 memcpy(data, &z->st, sizeof(z->st));
195 else {
196 struct zip_stat *st;
197 struct stat fst;
198 int err;
199
200 if (z->f)
201 err = fstat(fileno(z->f), &fst);
202 else
203 err = stat(z->fname, &fst);
204
205 if (err != 0) {
206 z->e[0] = ZIP_ER_READ; /* best match */
207 z->e[1] = errno;
208 return -1;
209 }
210
211 st = (struct zip_stat *)data;
212
213 zip_stat_init(st);
214 st->mtime = fst.st_mtime;
215 st->valid |= ZIP_STAT_MTIME;
216 if (z->len != -1) {
217 st->size = z->len;
218 st->valid |= ZIP_STAT_SIZE;
219 }
220 else if ((fst.st_mode&S_IFMT) == S_IFREG) {
221 st->size = fst.st_size;
222 st->valid |= ZIP_STAT_SIZE;
223 }
224 }
225 return sizeof(z->st);
226 }
227
228 case ZIP_SOURCE_ERROR:
229 if (len < sizeof(int)*2)
230 return -1;
231
232 memcpy(data, z->e, sizeof(int)*2);
233 return sizeof(int)*2;
234
235 case ZIP_SOURCE_FREE:
236 free(z->fname);
237 if (z->closep && z->f)
238 fclose(z->f);
239 free(z);
240 return 0;
241
242 default:
243 ;
244 }
245
246 return -1;
247 }
248
