Line data Source code
1 : /* data-compat.c - Compatibility interfaces for data objects.
2 : Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
3 :
4 : This file is part of GPGME.
5 :
6 : GPGME is free software; you can redistribute it and/or modify it
7 : under the terms of the GNU Lesser General Public License as
8 : published by the Free Software Foundation; either version 2.1 of
9 : the License, or (at your option) any later version.
10 :
11 : GPGME is distributed in the hope that it will be useful, but
12 : WITHOUT ANY WARRANTY; without even the implied warranty of
13 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 : Lesser General Public License for more details.
15 :
16 : You should have received a copy of the GNU Lesser General Public
17 : License along with this program; if not, write to the Free Software
18 : Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19 : 02111-1307, USA. */
20 :
21 : #if HAVE_CONFIG_H
22 : #include <config.h>
23 : #endif
24 :
25 : #include <errno.h>
26 : #ifdef HAVE_SYS_TIME_H
27 : # include <sys/time.h>
28 : #endif
29 : #ifdef HAVE_SYS_STAT_H
30 : # include <sys/stat.h>
31 : #endif
32 : #include <stdlib.h>
33 :
34 : #include "data.h"
35 : #include "util.h"
36 : #include "debug.h"
37 :
38 :
39 : /* Create a new data buffer filled with LENGTH bytes starting from
40 : OFFSET within the file FNAME or stream STREAM (exactly one must be
41 : non-zero). */
42 : gpgme_error_t
43 0 : gpgme_data_new_from_filepart (gpgme_data_t *r_dh, const char *fname,
44 : FILE *stream, gpgme_off_t offset, size_t length)
45 : {
46 : #if defined (HAVE_W32CE_SYSTEM) && defined (_MSC_VER)
47 : return gpgme_error (GPG_ERR_NOT_IMPLEMENTED);
48 : #else
49 : gpgme_error_t err;
50 0 : char *buf = NULL;
51 : int res;
52 :
53 0 : TRACE_BEG4 (DEBUG_DATA, "gpgme_data_new_from_filepart", r_dh,
54 : "file_name=%s, stream=%p, offset=%lli, length=%u",
55 : fname, stream, offset, length);
56 :
57 0 : if (stream && fname)
58 0 : return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
59 :
60 0 : if (fname)
61 0 : stream = fopen (fname, "rb");
62 0 : if (!stream)
63 0 : return TRACE_ERR (gpg_error_from_syserror ());
64 :
65 : #ifdef HAVE_FSEEKO
66 0 : res = fseeko (stream, offset, SEEK_SET);
67 : #else
68 : /* FIXME: Check for overflow, or at least bail at compilation. */
69 : res = fseek (stream, offset, SEEK_SET);
70 : #endif
71 :
72 0 : if (res)
73 : {
74 0 : int saved_err = gpg_error_from_syserror ();
75 0 : if (fname)
76 0 : fclose (stream);
77 0 : return TRACE_ERR (saved_err);
78 : }
79 :
80 0 : buf = malloc (length);
81 0 : if (!buf)
82 : {
83 0 : int saved_err = gpg_error_from_syserror ();
84 0 : if (fname)
85 0 : fclose (stream);
86 0 : return TRACE_ERR (saved_err);
87 : }
88 :
89 0 : while (fread (buf, length, 1, stream) < 1
90 0 : && ferror (stream) && errno == EINTR);
91 0 : if (ferror (stream))
92 : {
93 0 : int saved_err = gpg_error_from_syserror ();
94 0 : if (buf)
95 0 : free (buf);
96 0 : if (fname)
97 0 : fclose (stream);
98 0 : return TRACE_ERR (saved_err);
99 : }
100 :
101 0 : if (fname)
102 0 : fclose (stream);
103 :
104 0 : err = gpgme_data_new (r_dh);
105 0 : if (err)
106 : {
107 0 : if (buf)
108 0 : free (buf);
109 0 : return err;
110 : }
111 :
112 0 : (*r_dh)->data.mem.buffer = buf;
113 0 : (*r_dh)->data.mem.size = length;
114 0 : (*r_dh)->data.mem.length = length;
115 :
116 0 : return TRACE_SUC1 ("r_dh=%p", *r_dh);
117 : #endif
118 : }
119 :
120 :
121 : /* Create a new data buffer filled with the content of file FNAME.
122 : COPY must be non-zero (delayed reads are not supported yet). */
123 : gpgme_error_t
124 0 : gpgme_data_new_from_file (gpgme_data_t *r_dh, const char *fname, int copy)
125 : {
126 : #if defined (HAVE_W32CE_SYSTEM) && defined (_MSC_VER)
127 : return gpgme_error (GPG_ERR_NOT_IMPLEMENTED);
128 : #else
129 : gpgme_error_t err;
130 : struct stat statbuf;
131 0 : TRACE_BEG3 (DEBUG_DATA, "gpgme_data_new_from_file", r_dh,
132 : "file_name=%s, copy=%i (%s)", fname, copy, copy ? "yes" : "no");
133 :
134 0 : if (!fname || !copy)
135 0 : return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
136 :
137 0 : if (stat (fname, &statbuf) < 0)
138 0 : return TRACE_ERR (gpg_error_from_syserror ());
139 :
140 0 : err = gpgme_data_new_from_filepart (r_dh, fname, NULL, 0, statbuf.st_size);
141 0 : return TRACE_ERR (err);
142 : #endif
143 : }
144 :
145 :
146 : static int
147 0 : gpgme_error_to_errno (gpgme_error_t err)
148 : {
149 0 : int res = gpg_err_code_to_errno (gpg_err_code (err));
150 :
151 0 : if (!err)
152 : {
153 0 : switch (gpg_err_code (err))
154 : {
155 : case GPG_ERR_EOF:
156 0 : res = 0;
157 0 : break;
158 : case GPG_ERR_INV_VALUE:
159 0 : res = EINVAL;
160 0 : break;
161 : case GPG_ERR_NOT_SUPPORTED:
162 0 : res = ENOSYS;
163 0 : break;
164 : default:
165 : /* FIXME: Yeah, well. */
166 0 : res = EINVAL;
167 0 : break;
168 : }
169 : }
170 0 : TRACE3 (DEBUG_DATA, "gpgme:gpgme_error_to_errno", 0,
171 : "mapping %s <%s> to: %s", gpgme_strerror (err),
172 : gpgme_strsource (err), strerror (res));
173 0 : gpg_err_set_errno (res);
174 0 : return res ? -1 : 0;
175 : }
176 :
177 :
178 : static gpgme_ssize_t
179 0 : old_user_read (gpgme_data_t dh, void *buffer, size_t size)
180 : {
181 : gpgme_error_t err;
182 : size_t amt;
183 0 : TRACE_BEG2 (DEBUG_DATA, "gpgme:old_user_read", dh,
184 : "buffer=%p, size=%u", buffer, size);
185 :
186 0 : err = (*dh->data.old_user.cb) (dh->data.old_user.handle,
187 : buffer, size, &amt);
188 0 : if (err)
189 0 : return TRACE_SYSRES (gpgme_error_to_errno (err));
190 0 : return TRACE_SYSRES ((gpgme_ssize_t)amt);
191 : }
192 :
193 :
194 : static gpgme_off_t
195 0 : old_user_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
196 : {
197 : gpgme_error_t err;
198 0 : TRACE_BEG2 (DEBUG_DATA, "gpgme:old_user_seek", dh,
199 : "offset=%llu, whence=%i", offset, whence);
200 :
201 0 : if (whence != SEEK_SET || offset)
202 : {
203 0 : gpg_err_set_errno (EINVAL);
204 0 : return TRACE_SYSRES (-1);
205 : }
206 0 : err = (*dh->data.old_user.cb) (dh->data.old_user.handle, NULL, 0, NULL);
207 0 : if (err)
208 0 : return TRACE_SYSRES (gpgme_error_to_errno (err));
209 0 : return TRACE_SYSRES (0);
210 : }
211 :
212 :
213 : static struct _gpgme_data_cbs old_user_cbs =
214 : {
215 : old_user_read,
216 : NULL,
217 : old_user_seek,
218 : NULL
219 : };
220 :
221 :
222 : /* Create a new data buffer which retrieves the data from the callback
223 : function READ_CB. */
224 : gpgme_error_t
225 0 : gpgme_data_new_with_read_cb (gpgme_data_t *r_dh,
226 : int (*read_cb) (void *, char *, size_t, size_t *),
227 : void *read_cb_value)
228 : {
229 : gpgme_error_t err;
230 0 : TRACE_BEG2 (DEBUG_DATA, "gpgme_data_new_with_read_cb", r_dh,
231 : "read_cb=%p/%p", read_cb, read_cb_value);
232 :
233 0 : err = _gpgme_data_new (r_dh, &old_user_cbs);
234 :
235 0 : if (err)
236 0 : return TRACE_ERR (err);
237 :
238 0 : (*r_dh)->data.old_user.cb = read_cb;
239 0 : (*r_dh)->data.old_user.handle = read_cb_value;
240 0 : return TRACE_ERR (0);
241 : }
242 :
243 :
244 : gpgme_error_t
245 0 : gpgme_data_rewind (gpgme_data_t dh)
246 : {
247 : gpgme_error_t err;
248 0 : TRACE_BEG (DEBUG_DATA, "gpgme_data_rewind", dh);
249 :
250 0 : err = ((gpgme_data_seek (dh, 0, SEEK_SET) == -1)
251 0 : ? gpg_error_from_syserror () : 0);
252 :
253 0 : return TRACE_ERR (err);
254 : }
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