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