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 || 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 zip_uint64_t n;
129 size_t i;
130
131 z = (struct read_file *)state;
132 buf = (char *)data;
133
134 switch (cmd) {
135 case ZIP_SOURCE_OPEN:
136 if (z->fname) {
137 if ((z->f=fopen(z->fname, "rb")) == NULL) {
138 z->e[0] = ZIP_ER_OPEN;
139 z->e[1] = errno;
140 return -1;
141 }
142 }
143
144 if (z->closep && z->off > 0) {
145 if (fseeko(z->f, (off_t)z->off, SEEK_SET) < 0) {
146 z->e[0] = ZIP_ER_SEEK;
147 z->e[1] = errno;
148 return -1;
149 }
150 }
151 z->remain = z->len;
152 return 0;
153
154 case ZIP_SOURCE_READ:
155 if (z->remain != -1)
156 n = len > (zip_uint64_t)z->remain ? (zip_uint64_t)z->remain : len;
157 else
158 n = len;
159
160 if (n > SIZE_MAX)
161 n = SIZE_MAX;
162
163 if (!z->closep) {
164 /* we might share this file with others, so let's be safe */
165 if (fseeko(z->f, (off_t)(z->off + (zip_uint64_t)(z->len-z->remain)), SEEK_SET) < 0) {
166 z->e[0] = ZIP_ER_SEEK;
167 z->e[1] = errno;
168 return -1;
169 }
170 }
171
172 if ((i=fread(buf, 1, (size_t)n, z->f)) == 0) {
173 if (ferror(z->f)) {
174 z->e[0] = ZIP_ER_READ;
175 z->e[1] = errno;
176 return -1;
177 }
178 }
179
180 if (z->remain != -1)
181 z->remain -= i;
182
183 return (zip_int64_t)i;
184
185 case ZIP_SOURCE_CLOSE:
186 if (z->fname) {
187 fclose(z->f);
188 z->f = NULL;
189 }
190 return 0;
191
192 case ZIP_SOURCE_STAT:
193 {
194 if (len < sizeof(z->st))
195 return -1;
196
197 if (z->st.valid != 0)
198 memcpy(data, &z->st, sizeof(z->st));
199 else {
200 struct zip_stat *st;
201 struct stat fst;
202 int err;
203
204 if (z->f)
205 err = fstat(fileno(z->f), &fst);
206 else
207 err = stat(z->fname, &fst);
208
209 if (err != 0) {
210 z->e[0] = ZIP_ER_READ; /* best match */
211 z->e[1] = errno;
212 return -1;
213 }
214
215 st = (struct zip_stat *)data;
216
217 zip_stat_init(st);
218 st->mtime = fst.st_mtime;
219 st->valid |= ZIP_STAT_MTIME;
220 if (z->len != -1) {
221 st->size = (zip_uint64_t)z->len;
222 st->valid |= ZIP_STAT_SIZE;
223 }
224 else if ((fst.st_mode&S_IFMT) == S_IFREG) {
225 st->size = (zip_uint64_t)fst.st_size;
226 st->valid |= ZIP_STAT_SIZE;
227 }
228 }
229 return sizeof(z->st);
230 }
231
232 case ZIP_SOURCE_ERROR:
233 if (len < sizeof(int)*2)
234 return -1;
235
236 memcpy(data, z->e, sizeof(int)*2);
237 return sizeof(int)*2;
238
239 case ZIP_SOURCE_FREE:
240 free(z->fname);
241 if (z->closep && z->f)
242 fclose(z->f);
243 free(z);
244 return 0;
245
246 default:
247 ;
248 }
249
250 return -1;
251 }
252
