summaryrefslogtreecommitdiffstats
path: root/libkdenetwork/libgpgme-copy/gpgme/data.c
blob: 22768ff533dcd04ef9b19999bd5d86bbe37a2213 (plain)
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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
/* data.c - An abstraction for data objects.
   Copyright (C) 2002, 2003, 2004, 2005 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 <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

#include "gpgme.h"
#include "data.h"
#include "util.h"
#include "ops.h"
#include "priv-io.h"


gpgme_error_t
_gpgme_data_new (gpgme_data_t *r_dh, struct _gpgme_data_cbs *cbs)
{
  gpgme_data_t dh;

  if (!r_dh)
    return gpg_error (GPG_ERR_INV_VALUE);

  *r_dh = NULL;
  dh = calloc (1, sizeof (*dh));
  if (!dh)
    return gpg_error_from_errno (errno);

  dh->cbs = cbs;

  *r_dh = dh;
  return 0;
}


void
_gpgme_data_release (gpgme_data_t dh)
{
  if (!dh)
    return;

  if (dh->file_name)
    free (dh->file_name);
  free (dh);
}


/* Read up to SIZE bytes into buffer BUFFER from the data object with
   the handle DH.  Return the number of characters read, 0 on EOF and
   -1 on error.  If an error occurs, errno is set.  */
ssize_t
gpgme_data_read (gpgme_data_t dh, void *buffer, size_t size)
{
  if (!dh)
    {
      errno = EINVAL;
      return -1;
    }
  if (!dh->cbs->read)
    {
      errno = ENOSYS;
      return -1;
    }
  return (*dh->cbs->read) (dh, buffer, size);
}


/* Write up to SIZE bytes from buffer BUFFER to the data object with
   the handle DH.  Return the number of characters written, or -1 on
   error.  If an error occurs, errno is set.  */
ssize_t
gpgme_data_write (gpgme_data_t dh, const void *buffer, size_t size)
{
  if (!dh)
    {
      errno = EINVAL;
      return -1;
    }
  if (!dh->cbs->write)
    {
      errno = ENOSYS;
      return -1;
    }
  return (*dh->cbs->write) (dh, buffer, size);
}


/* Set the current position from where the next read or write starts
   in the data object with the handle DH to OFFSET, relativ to
   WHENCE.  */
off_t
gpgme_data_seek (gpgme_data_t dh, off_t offset, int whence)
{
  if (!dh)
    {
      errno = EINVAL;
      return -1;
    }
  if (!dh->cbs->seek)
    {
      errno = ENOSYS;
      return -1;
    }

  /* For relative movement, we must take into account the actual
     position of the read counter.  */
  if (whence == SEEK_CUR)
    offset -= dh->pending_len;

  offset = (*dh->cbs->seek) (dh, offset, whence);
  if (offset >= 0)
    dh->pending_len = 0;

  return offset;
}


/* Release the data object with the handle DH.  */
void
gpgme_data_release (gpgme_data_t dh)
{
  if (!dh)
    return;

  if (dh->cbs->release)
    (*dh->cbs->release) (dh);
  _gpgme_data_release (dh);
}


/* Get the current encoding meta information for the data object with
   handle DH.  */
gpgme_data_encoding_t
gpgme_data_get_encoding (gpgme_data_t dh)
{
  return dh ? dh->encoding : GPGME_DATA_ENCODING_NONE;
}


/* Set the encoding meta information for the data object with handle
   DH to ENC.  */
gpgme_error_t
gpgme_data_set_encoding (gpgme_data_t dh, gpgme_data_encoding_t enc)
{
  if (!dh)
    return gpg_error (GPG_ERR_INV_VALUE);
  if (enc < 0 || enc > GPGME_DATA_ENCODING_ARMOR)
    return gpg_error (GPG_ERR_INV_VALUE);
  dh->encoding = enc;
  return 0;
}


/* Set the file name associated with the data object with handle DH to
   FILE_NAME.  */
gpgme_error_t
gpgme_data_set_file_name (gpgme_data_t dh, const char *file_name)
{
  if (!dh)
    return gpg_error (GPG_ERR_INV_VALUE);

  if (dh->file_name)
    free (dh->file_name);

  if (file_name)
    {
      dh->file_name = strdup (file_name);
      if (!dh->file_name)
	return gpg_error_from_errno (errno);
    }
  else
    dh->file_name = 0;

  return 0;
}

/* Get the file name associated with the data object with handle DH,
   or NULL if there is none.  */
char *
gpgme_data_get_file_name (gpgme_data_t dh)
{
  if (!dh)
    return NULL;

  return dh->file_name;
}


/* Functions to support the wait interface.  */

gpgme_error_t
_gpgme_data_inbound_handler (void *opaque, int fd)
{
  gpgme_data_t dh = (gpgme_data_t) opaque;
  char buffer[BUFFER_SIZE];
  char *bufp = buffer;
  ssize_t buflen;

  buflen = _gpgme_io_read (fd, buffer, BUFFER_SIZE);
  if (buflen < 0)
    return gpg_error_from_errno (errno);
  if (buflen == 0)
    {
      _gpgme_io_close (fd);
      return 0;
    }

  do
    {
      ssize_t amt = gpgme_data_write (dh, bufp, buflen);
      if (amt == 0 || (amt < 0 && errno != EINTR))
	return gpg_error_from_errno (errno);
      bufp += amt;
      buflen -= amt;
    }
  while (buflen > 0);
  return 0;
}


gpgme_error_t
_gpgme_data_outbound_handler (void *opaque, int fd)
{
  gpgme_data_t dh = (gpgme_data_t) opaque;
  ssize_t nwritten;

  if (!dh->pending_len)
    {
      ssize_t amt = gpgme_data_read (dh, dh->pending, BUFFER_SIZE);
      if (amt < 0)
	return gpg_error_from_errno (errno);
      if (amt == 0)
	{
	  _gpgme_io_close (fd);
	  return 0;
	}
      dh->pending_len = amt;
    }

  nwritten = _gpgme_io_write (fd, dh->pending, dh->pending_len);
  if (nwritten == -1 && errno == EAGAIN)
    return 0;

  if (nwritten == -1 && errno == EPIPE)
    {
      /* Not much we can do.  The other end closed the pipe, but we
	 still have data.  This should only ever happen if the other
	 end is going to tell us what happened on some other channel.
	 Silently close our end.  */
      _gpgme_io_close (fd);
      return 0;
    }

  if (nwritten <= 0)
    return gpg_error_from_errno (errno);

  if (nwritten < dh->pending_len)
    memmove (dh->pending, dh->pending + nwritten, dh->pending_len - nwritten);
  dh->pending_len -= nwritten;
  return 0;
}


/* Get the file descriptor associated with DH, if possible.  Otherwise
   return -1.  */
int
_gpgme_data_get_fd (gpgme_data_t dh)
{
  if (!dh || !dh->cbs->get_fd)
    return -1;
  return (*dh->cbs->get_fd) (dh);
}