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
|
/* gtkpasswordentrybuffer.c: Entry buffer with secure allocation
*
Copyright 2009 Stefan Walter
* Copyright 2020 GNOME Foundation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkpasswordentrybuffer.h"
#include "gtksecurememoryprivate.h"
#include <string.h>
/* Initial size of buffer, in bytes */
#define MIN_SIZE 16
/**
* GtkPasswordEntryBuffer:
*
* A `GtkEntryBuffer` that locks the underlying memory to prevent it
* from being swapped to disk.
*
* `GtkPasswordEntry` uses a `GtkPasswordEntryBuffer`.
*
* Since: 4.4
*/
struct _GtkPasswordEntryBuffer
{
GtkEntryBuffer parent_instance;
char *text;
gsize text_size;
gsize text_bytes;
guint text_chars;
};
G_DEFINE_TYPE (GtkPasswordEntryBuffer, gtk_password_entry_buffer, GTK_TYPE_ENTRY_BUFFER)
static const char *
gtk_password_entry_buffer_real_get_text (GtkEntryBuffer *buffer,
gsize *n_bytes)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
if (n_bytes != NULL)
*n_bytes = self->text_bytes;
if (!self->text)
return "";
return self->text;
}
static guint
gtk_password_entry_buffer_real_get_length (GtkEntryBuffer *buffer)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
return self->text_chars;
}
static guint
gtk_password_entry_buffer_real_insert_text (GtkEntryBuffer *buffer,
guint position,
const char *chars,
guint n_chars)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
gsize n_bytes = g_utf8_offset_to_pointer (chars, n_chars) - chars;
/* Need more memory */
if (n_bytes + self->text_bytes + 1 > self->text_size)
{
/* Calculate our new buffer size */
while (n_bytes + self->text_bytes + 1 > self->text_size)
{
if (self->text_size == 0)
{
self->text_size = MIN_SIZE;
}
else
{
if (2 * self->text_size < GTK_ENTRY_BUFFER_MAX_SIZE)
{
self->text_size *= 2;
}
else
{
self->text_size = GTK_ENTRY_BUFFER_MAX_SIZE;
if (n_bytes > self->text_size - self->text_bytes - 1)
{
n_bytes = self->text_size - self->text_bytes - 1;
n_bytes = g_utf8_find_prev_char (chars, chars + n_bytes + 1) - chars;
n_chars = g_utf8_strlen (chars, n_bytes);
}
break;
}
}
}
self->text = gtk_secure_realloc (self->text, self->text_size);
}
/* Actual text insertion */
gsize at = g_utf8_offset_to_pointer (self->text, position) - self->text;
memmove (self->text + at + n_bytes, self->text + at, self->text_bytes - at);
memcpy (self->text + at, chars, n_bytes);
/* Book keeping */
self->text_bytes += n_bytes;
self->text_chars += n_chars;
self->text[self->text_bytes] = '\0';
gtk_entry_buffer_emit_inserted_text (buffer, position, chars, n_chars);
return n_chars;
}
static void
gtk_password_entry_buffer_real_deleted_text (GtkEntryBuffer *buffer,
guint position,
guint n_chars)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
gsize start = g_utf8_offset_to_pointer (self->text, position) - self->text;
gsize end = g_utf8_offset_to_pointer (self->text, position + n_chars) - self->text;
memmove (self->text + start, self->text + end, self->text_bytes + 1 - end);
self->text_chars -= n_chars;
self->text_bytes -= (end - start);
g_object_notify (G_OBJECT (buffer), "text");
g_object_notify (G_OBJECT (buffer), "length");
}
static guint
gtk_password_entry_buffer_real_delete_text (GtkEntryBuffer *buffer,
guint position,
guint n_chars)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (buffer);
if (position > self->text_chars)
position = self->text_chars;
if (position + n_chars > self->text_chars)
n_chars = self->text_chars - position;
if (n_chars > 0)
gtk_entry_buffer_emit_deleted_text (buffer, position, n_chars);
return n_chars;
}
static void
gtk_password_entry_buffer_finalize (GObject *gobject)
{
GtkPasswordEntryBuffer *self = GTK_PASSWORD_ENTRY_BUFFER (gobject);
g_clear_pointer (&self->text, gtk_secure_free);
self->text_bytes = 0;
self->text_size = 0;
self->text_chars = 0;
G_OBJECT_CLASS (gtk_password_entry_buffer_parent_class)->finalize (gobject);
}
static void
gtk_password_entry_buffer_class_init (GtkPasswordEntryBufferClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkEntryBufferClass *buffer_class = GTK_ENTRY_BUFFER_CLASS (klass);
gobject_class->finalize = gtk_password_entry_buffer_finalize;
buffer_class->get_text = gtk_password_entry_buffer_real_get_text;
buffer_class->get_length = gtk_password_entry_buffer_real_get_length;
buffer_class->insert_text = gtk_password_entry_buffer_real_insert_text;
buffer_class->delete_text = gtk_password_entry_buffer_real_delete_text;
buffer_class->deleted_text = gtk_password_entry_buffer_real_deleted_text;
}
static void
gtk_password_entry_buffer_init (GtkPasswordEntryBuffer *self)
{
}
/**
* gtk_password_entry_buffer_new:
*
* Creates a new `GtkEntryBuffer` using secure memory allocations.
*
* Returns: (transfer full): the newly created instance
*/
GtkEntryBuffer *
gtk_password_entry_buffer_new (void)
{
return g_object_new (GTK_TYPE_PASSWORD_ENTRY_BUFFER, NULL);
}
|
