storage.c 5.56 KB
Newer Older
1
2
3
4
/*
 * Trivial storage driver for example programs
 *
 * Copyright (C) 2019 Benjamin Berg <bberg@redhat.com>
5
 * Copyright (C) 2019 Marco Trevisan <marco.trevisan@canonical.com>
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 *
 * This library 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.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

22
23
#define FP_COMPONENT "example-storage"

24
#include <libfprint/fprint.h>
25
#include <libfprint/fpi-compat.h>
26
#include "storage.h"
27
28

#include <errno.h>
29
30
31
32
33
34
35
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define STORAGE_FILE "test-storage.variant"

static char *
36
get_print_data_descriptor (FpPrint *print, FpDevice *dev, FpFinger finger)
37
{
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
  const char *driver;
  const char *dev_id;

  if (print)
    {
      driver = fp_print_get_driver (print);
      dev_id = fp_print_get_device_id (print);
    }
  else
    {
      driver = fp_device_get_driver (dev);
      dev_id = fp_device_get_device_id (dev);
    }

  return g_strdup_printf ("%s/%s/%x",
                          driver,
                          dev_id,
                          finger);
56
57
}

58
static GVariantDict *
59
load_data (void)
60
{
61
62
  GVariantDict *res;
  GVariant *var;
63
  gchar *contents = NULL;
64
  gsize length = 0;
65
66
67
68
69
70
71

  if (!g_file_get_contents (STORAGE_FILE, &contents, &length, NULL))
    {
      g_warning ("Error loading storage, assuming it is empty");
      return g_variant_dict_new (NULL);
    }

72
73
74
75
76
77
  var = g_variant_new_from_data (G_VARIANT_TYPE_VARDICT,
                                 contents,
                                 length,
                                 FALSE,
                                 g_free,
                                 contents);
78
79
80
81

  res = g_variant_dict_new (var);
  g_variant_unref (var);
  return res;
82
83
84
}

static int
85
save_data (GVariant *data)
86
{
87
88
  const gchar *contents = NULL;
  gsize length;
89

90
91
  length = g_variant_get_size (data);
  contents = (gchar *) g_variant_get_data (data);
92

93
94
95
96
97
  if (!g_file_set_contents (STORAGE_FILE, contents, length, NULL))
    {
      g_warning ("Error saving storage,!");
      return -1;
    }
98

99
100
  g_variant_ref_sink (data);
  g_variant_unref (data);
101

102
  return 0;
103
104
105
}

int
106
print_data_save (FpPrint *print, FpFinger finger)
107
{
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
  g_autofree gchar *descr = get_print_data_descriptor (print, NULL, finger);

  g_autoptr(GError) error = NULL;
  g_autoptr(GVariantDict) dict = NULL;
  g_autofree guchar *data = NULL;
  GVariant *val;
  gsize size;
  int res;

  dict = load_data ();

  fp_print_serialize (print, &data, &size, &error);
  if (error)
    {
      g_warning ("Error serializing data: %s", error->message);
      return -1;
    }
  val = g_variant_new_fixed_array (G_VARIANT_TYPE ("y"), data, size, 1);
  g_variant_dict_insert_value (dict, descr, val);

  res = save_data (g_variant_dict_end (dict));

  return res;
131
132
}

133
FpPrint *
134
print_data_load (FpDevice *dev, FpFinger finger)
135
{
136
137
138
139
  g_autofree gchar *descr = get_print_data_descriptor (NULL, dev, finger);

  g_autoptr(GVariant) val = NULL;
  g_autoptr(GVariantDict) dict = NULL;
140
  const guchar *stored_data = NULL;
141
  gsize stored_len;
142

143
144
  dict = load_data ();
  val = g_variant_dict_lookup_value (dict, descr, G_VARIANT_TYPE ("ay"));
145

146
147
148
149
  if (val)
    {
      FpPrint *print;
      g_autoptr(GError) error = NULL;
150

151
      stored_data = (const guchar *) g_variant_get_fixed_array (val, &stored_len, 1);
152
      print = fp_print_deserialize (stored_data, stored_len, &error);
153

154
155
      if (error)
        g_warning ("Error deserializing data: %s", error->message);
156

157
158
      return print;
    }
159

160
  return NULL;
161
}
162

163
164
165
FpPrint *
print_create_template (FpDevice *dev, FpFinger finger)
{
166
  g_autoptr(GDateTime) datetime = NULL;
167
  g_autoptr(GDate) date = NULL;
168
169
170
171
172
173
174
175
176
177
178
179
  FpPrint *template = NULL;
  gint year, month, day;

  template = fp_print_new (dev);
  fp_print_set_finger (template, finger);
  fp_print_set_username (template, g_get_user_name ());
  datetime = g_date_time_new_now_local ();
  g_date_time_get_ymd (datetime, &year, &month, &day);
  date = g_date_new_dmy (day, month, year);
  fp_print_set_enroll_date (template, date);

  return template;
180
181
182
}


183
gboolean
184
185
save_image_to_pgm (FpImage *img, const char *path)
{
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
  FILE *fd = fopen (path, "w");
  size_t write_size;
  const guchar *data = fp_image_get_data (img, &write_size);
  int r;

  if (!fd)
    {
      g_warning ("could not open '%s' for writing: %d", path, errno);
      return FALSE;
    }

  r = fprintf (fd, "P5 %d %d 255\n",
               fp_image_get_width (img), fp_image_get_height (img));
  if (r < 0)
    {
      fclose (fd);
      g_critical ("pgm header write failed, error %d", r);
      return FALSE;
    }

  r = fwrite (data, 1, write_size, fd);
  if (r < write_size)
    {
      fclose (fd);
      g_critical ("short write (%d)", r);
      return FALSE;
    }

  fclose (fd);
  g_debug ("written to '%s'", path);

  return TRUE;
218
219
}

220
221
gboolean
print_image_save (FpPrint *print, const char *path)
222
{
223
  FpImage *img = NULL;
224

225
226
  g_return_val_if_fail (FP_IS_PRINT (print), FALSE);
  g_return_val_if_fail (path != NULL, FALSE);
227

228
  img = fp_print_get_image (print);
229

230
231
  if (img)
    return save_image_to_pgm (img, path);
232

233
  return FALSE;
234
}