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
|
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* shell-secure-text-buffer.c - secure memory clutter text buffer
Copyright (C) 2009 Stefan Walter
Copyright (C) 2012 Red Hat Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the Gnome Library; see the file COPYING.LIB. If not,
see <http://www.gnu.org/licenses/>.
Author: Stef Walter <stefw@gnome.org>
*/
#include "config.h"
#include "shell-secure-text-buffer.h"
#define GCR_API_SUBJECT_TO_CHANGE
#include <gcr/gcr.h>
#include <string.h>
struct _ShellSecureTextBuffer {
ClutterTextBuffer parent;
gchar *text;
gsize text_size;
gsize text_bytes;
guint text_chars;
};
/* Initial size of buffer, in bytes */
#define MIN_SIZE 16
G_DEFINE_TYPE (ShellSecureTextBuffer, shell_secure_text_buffer, CLUTTER_TYPE_TEXT_BUFFER);
static const gchar *
shell_secure_text_buffer_real_get_text (ClutterTextBuffer *buffer,
gsize *n_bytes)
{
ShellSecureTextBuffer *self = SHELL_SECURE_TEXT_BUFFER (buffer);
if (n_bytes)
*n_bytes = self->text_bytes;
if (!self->text)
return "";
return self->text;
}
static guint
shell_secure_text_buffer_real_get_length (ClutterTextBuffer *buffer)
{
ShellSecureTextBuffer *self = SHELL_SECURE_TEXT_BUFFER (buffer);
return self->text_chars;
}
static guint
shell_secure_text_buffer_real_insert_text (ClutterTextBuffer *buffer,
guint position,
const gchar *chars,
guint n_chars)
{
ShellSecureTextBuffer *self = SHELL_SECURE_TEXT_BUFFER (buffer);
gsize n_bytes;
gsize at;
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 < CLUTTER_TEXT_BUFFER_MAX_SIZE)
{
self->text_size *= 2;
}
else
{
self->text_size = CLUTTER_TEXT_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 = gcr_secure_memory_realloc (self->text, self->text_size);
}
/* Actual text insertion */
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';
clutter_text_buffer_emit_inserted_text (buffer, position, chars, n_chars);
return n_chars;
}
static guint
shell_secure_text_buffer_real_delete_text (ClutterTextBuffer *buffer,
guint position,
guint n_chars)
{
ShellSecureTextBuffer *self = SHELL_SECURE_TEXT_BUFFER (buffer);
gsize start, end;
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)
{
start = g_utf8_offset_to_pointer (self->text, position) - self->text;
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);
clutter_text_buffer_emit_deleted_text (buffer, position, n_chars);
}
return n_chars;
}
static void
shell_secure_text_buffer_init (ShellSecureTextBuffer *self)
{
}
static void
shell_secure_text_buffer_finalize (GObject *obj)
{
ShellSecureTextBuffer *self = SHELL_SECURE_TEXT_BUFFER (obj);
if (self->text)
{
gcr_secure_memory_strfree (self->text);
self->text = NULL;
self->text_bytes = self->text_size = 0;
self->text_chars = 0;
}
G_OBJECT_CLASS (shell_secure_text_buffer_parent_class)->finalize (obj);
}
static void
shell_secure_text_buffer_class_init (ShellSecureTextBufferClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterTextBufferClass *buffer_class = CLUTTER_TEXT_BUFFER_CLASS (klass);
gobject_class->finalize = shell_secure_text_buffer_finalize;
buffer_class->get_text = shell_secure_text_buffer_real_get_text;
buffer_class->get_length = shell_secure_text_buffer_real_get_length;
buffer_class->insert_text = shell_secure_text_buffer_real_insert_text;
buffer_class->delete_text = shell_secure_text_buffer_real_delete_text;
}
ClutterTextBuffer *
shell_secure_text_buffer_new (void)
{
return g_object_new (SHELL_TYPE_SECURE_TEXT_BUFFER, NULL);
}
|
