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 40 : 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 : gpgme_error_t err;
47 40 : char *buf = NULL;
48 : int res;
49 :
50 40 : TRACE_BEG4 (DEBUG_DATA, "gpgme_data_new_from_filepart", r_dh,
51 : "file_name=%s, stream=%p, offset=%lli, length=%u",
52 : fname, stream, offset, length);
53 :
54 40 : if (stream && fname)
55 0 : return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
56 :
57 40 : if (fname)
58 37 : stream = fopen (fname, "rb");
59 40 : if (!stream)
60 1 : return TRACE_ERR (gpg_error_from_syserror ());
61 :
62 : #ifdef HAVE_FSEEKO
63 39 : res = fseeko (stream, offset, SEEK_SET);
64 : #else
65 : /* FIXME: Check for overflow, or at least bail at compilation. */
66 : res = fseek (stream, offset, SEEK_SET);
67 : #endif
68 :
69 39 : if (res)
70 : {
71 0 : int saved_err = gpg_error_from_syserror ();
72 0 : if (fname)
73 0 : fclose (stream);
74 0 : return TRACE_ERR (saved_err);
75 : }
76 :
77 39 : buf = malloc (length);
78 39 : if (!buf)
79 : {
80 0 : int saved_err = gpg_error_from_syserror ();
81 0 : if (fname)
82 0 : fclose (stream);
83 0 : return TRACE_ERR (saved_err);
84 : }
85 :
86 39 : while (fread (buf, length, 1, stream) < 1
87 0 : && ferror (stream) && errno == EINTR);
88 39 : if (ferror (stream))
89 : {
90 0 : int saved_err = gpg_error_from_syserror ();
91 0 : if (buf)
92 0 : free (buf);
93 0 : if (fname)
94 0 : fclose (stream);
95 0 : return TRACE_ERR (saved_err);
96 : }
97 :
98 39 : if (fname)
99 36 : fclose (stream);
100 :
101 39 : err = gpgme_data_new (r_dh);
102 39 : if (err)
103 : {
104 0 : if (buf)
105 0 : free (buf);
106 0 : return err;
107 : }
108 :
109 39 : (*r_dh)->data.mem.buffer = buf;
110 39 : (*r_dh)->data.mem.size = length;
111 39 : (*r_dh)->data.mem.length = length;
112 :
113 39 : return TRACE_SUC1 ("r_dh=%p", *r_dh);
114 : }
115 :
116 :
117 : /* Create a new data buffer filled with the content of file FNAME.
118 : COPY must be non-zero (delayed reads are not supported yet). */
119 : gpgme_error_t
120 35 : gpgme_data_new_from_file (gpgme_data_t *r_dh, const char *fname, int copy)
121 : {
122 : gpgme_error_t err;
123 : struct stat statbuf;
124 35 : TRACE_BEG3 (DEBUG_DATA, "gpgme_data_new_from_file", r_dh,
125 : "file_name=%s, copy=%i (%s)", fname, copy, copy ? "yes" : "no");
126 :
127 35 : if (!fname || !copy)
128 1 : return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
129 :
130 34 : if (stat (fname, &statbuf) < 0)
131 1 : return TRACE_ERR (gpg_error_from_syserror ());
132 :
133 33 : err = gpgme_data_new_from_filepart (r_dh, fname, NULL, 0, statbuf.st_size);
134 33 : return TRACE_ERR (err);
135 : }
136 :
137 :
138 : static int
139 0 : gpgme_error_to_errno (gpgme_error_t err)
140 : {
141 0 : int res = gpg_err_code_to_errno (gpg_err_code (err));
142 :
143 0 : if (!err)
144 : {
145 0 : switch (gpg_err_code (err))
146 : {
147 : case GPG_ERR_EOF:
148 0 : res = 0;
149 0 : break;
150 : case GPG_ERR_INV_VALUE:
151 0 : res = EINVAL;
152 0 : break;
153 : case GPG_ERR_NOT_SUPPORTED:
154 0 : res = ENOSYS;
155 0 : break;
156 : default:
157 : /* FIXME: Yeah, well. */
158 0 : res = EINVAL;
159 0 : break;
160 : }
161 : }
162 0 : TRACE3 (DEBUG_DATA, "gpgme:gpgme_error_to_errno", 0,
163 : "mapping %s <%s> to: %s", gpgme_strerror (err),
164 : gpgme_strsource (err), strerror (res));
165 0 : gpg_err_set_errno (res);
166 0 : return res ? -1 : 0;
167 : }
168 :
169 :
170 : static gpgme_ssize_t
171 0 : old_user_read (gpgme_data_t dh, void *buffer, size_t size)
172 : {
173 : gpgme_error_t err;
174 : size_t amt;
175 0 : TRACE_BEG2 (DEBUG_DATA, "gpgme:old_user_read", dh,
176 : "buffer=%p, size=%u", buffer, size);
177 :
178 0 : err = (*dh->data.old_user.cb) (dh->data.old_user.handle,
179 : buffer, size, &amt);
180 0 : if (err)
181 0 : return TRACE_SYSRES (gpgme_error_to_errno (err));
182 0 : return TRACE_SYSRES ((gpgme_ssize_t)amt);
183 : }
184 :
185 :
186 : static gpgme_off_t
187 0 : old_user_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
188 : {
189 : gpgme_error_t err;
190 0 : TRACE_BEG2 (DEBUG_DATA, "gpgme:old_user_seek", dh,
191 : "offset=%llu, whence=%i", offset, whence);
192 :
193 0 : if (whence != SEEK_SET || offset)
194 : {
195 0 : gpg_err_set_errno (EINVAL);
196 0 : return TRACE_SYSRES (-1);
197 : }
198 0 : err = (*dh->data.old_user.cb) (dh->data.old_user.handle, NULL, 0, NULL);
199 0 : if (err)
200 0 : return TRACE_SYSRES (gpgme_error_to_errno (err));
201 0 : return TRACE_SYSRES (0);
202 : }
203 :
204 :
205 : static struct _gpgme_data_cbs old_user_cbs =
206 : {
207 : old_user_read,
208 : NULL,
209 : old_user_seek,
210 : NULL
211 : };
212 :
213 :
214 : /* Create a new data buffer which retrieves the data from the callback
215 : function READ_CB. */
216 : gpgme_error_t
217 0 : gpgme_data_new_with_read_cb (gpgme_data_t *r_dh,
218 : int (*read_cb) (void *, char *, size_t, size_t *),
219 : void *read_cb_value)
220 : {
221 : gpgme_error_t err;
222 0 : TRACE_BEG2 (DEBUG_DATA, "gpgme_data_new_with_read_cb", r_dh,
223 : "read_cb=%p/%p", read_cb, read_cb_value);
224 :
225 0 : err = _gpgme_data_new (r_dh, &old_user_cbs);
226 :
227 0 : if (err)
228 0 : return TRACE_ERR (err);
229 :
230 0 : (*r_dh)->data.old_user.cb = read_cb;
231 0 : (*r_dh)->data.old_user.handle = read_cb_value;
232 0 : return TRACE_ERR (0);
233 : }
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