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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* egg-secure-buffer.c - secure memory gtkentry buffer
Copyright (C) 2009 Stefan Walter
The Gnome Keyring Library 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.
The Gnome Keyring 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
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,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Stef Walter <stef@memberwebs.com>
*/
#include "config.h"
#include "egg-entry-buffer.h"
#include "egg-secure-memory.h"
#include <string.h>
/* Initial size of buffer, in bytes */
#define MIN_SIZE 16
struct _EggEntryBufferPrivate
{
gchar *text;
gsize text_size;
gsize text_bytes;
guint text_chars;
};
G_DEFINE_TYPE (EggEntryBuffer, egg_entry_buffer, GTK_TYPE_ENTRY_BUFFER);
/* --------------------------------------------------------------------------------
* SECURE IMPLEMENTATIONS OF TEXT BUFFER
*/
static const gchar*
egg_entry_buffer_real_get_text (GtkEntryBuffer *buffer, gsize *n_bytes)
{
EggEntryBuffer *self = EGG_ENTRY_BUFFER (buffer);
if (n_bytes)
*n_bytes = self->priv->text_bytes;
if (!self->priv->text)
return "";
return self->priv->text;
}
static guint
egg_entry_buffer_real_get_length (GtkEntryBuffer *buffer)
{
EggEntryBuffer *self = EGG_ENTRY_BUFFER (buffer);
return self->priv->text_chars;
}
static guint
egg_entry_buffer_real_insert_text (GtkEntryBuffer *buffer, guint position,
const gchar *chars, guint n_chars)
{
EggEntryBuffer *self = EGG_ENTRY_BUFFER (buffer);
EggEntryBufferPrivate *pv = self->priv;
gsize n_bytes;
gsize at;
n_bytes = g_utf8_offset_to_pointer (chars, n_chars) - chars;
/* Need more memory */
if (n_bytes + pv->text_bytes + 1 > pv->text_size) {
/* Calculate our new buffer size */
while (n_bytes + pv->text_bytes + 1 > pv->text_size) {
if (pv->text_size == 0) {
pv->text_size = MIN_SIZE;
} else {
if (2 * pv->text_size < GTK_ENTRY_BUFFER_MAX_SIZE) {
pv->text_size *= 2;
} else {
pv->text_size = GTK_ENTRY_BUFFER_MAX_SIZE;
if (n_bytes > pv->text_size - pv->text_bytes - 1) {
n_bytes = pv->text_size - pv->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;
}
}
}
pv->text = egg_secure_realloc (pv->text, pv->text_size);
}
/* Actual text insertion */
at = g_utf8_offset_to_pointer (pv->text, position) - pv->text;
g_memmove (pv->text + at + n_bytes, pv->text + at, pv->text_bytes - at);
memcpy (pv->text + at, chars, n_bytes);
/* Book keeping */
pv->text_bytes += n_bytes;
pv->text_chars += n_chars;
pv->text[pv->text_bytes] = '\0';
gtk_entry_buffer_emit_inserted_text (buffer, position, chars, n_chars);
return n_chars;
}
static guint
egg_entry_buffer_real_delete_text (GtkEntryBuffer *buffer, guint position, guint n_chars)
{
EggEntryBuffer *self = EGG_ENTRY_BUFFER (buffer);
EggEntryBufferPrivate *pv = self->priv;
gsize start, end;
if (position > pv->text_chars)
position = pv->text_chars;
if (position + n_chars > pv->text_chars)
n_chars = pv->text_chars - position;
if (n_chars > 0) {
start = g_utf8_offset_to_pointer (pv->text, position) - pv->text;
end = g_utf8_offset_to_pointer (pv->text, position + n_chars) - pv->text;
g_memmove (pv->text + start, pv->text + end, pv->text_bytes + 1 - end);
pv->text_chars -= n_chars;
pv->text_bytes -= (end - start);
gtk_entry_buffer_emit_deleted_text (buffer, position, n_chars);
}
return n_chars;
}
/* --------------------------------------------------------------------------------
*
*/
static void
egg_entry_buffer_init (EggEntryBuffer *self)
{
EggEntryBufferPrivate *pv;
pv = self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, EGG_TYPE_ENTRY_BUFFER, EggEntryBufferPrivate);
pv->text = NULL;
pv->text_chars = 0;
pv->text_bytes = 0;
pv->text_size = 0;
}
static void
egg_entry_buffer_finalize (GObject *obj)
{
EggEntryBuffer *self = EGG_ENTRY_BUFFER (obj);
EggEntryBufferPrivate *pv = self->priv;
if (pv->text) {
egg_secure_strfree (pv->text);
pv->text = NULL;
pv->text_bytes = pv->text_size = 0;
pv->text_chars = 0;
}
G_OBJECT_CLASS (egg_entry_buffer_parent_class)->finalize (obj);
}
static void
egg_entry_buffer_class_init (EggEntryBufferClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkEntryBufferClass *buffer_class = GTK_ENTRY_BUFFER_CLASS (klass);
gobject_class->finalize = egg_entry_buffer_finalize;
buffer_class->get_text = egg_entry_buffer_real_get_text;
buffer_class->get_length = egg_entry_buffer_real_get_length;
buffer_class->insert_text = egg_entry_buffer_real_insert_text;
buffer_class->delete_text = egg_entry_buffer_real_delete_text;
g_type_class_add_private (gobject_class, sizeof (EggEntryBufferPrivate));
}
/* --------------------------------------------------------------------------------
*
*/
GtkEntryBuffer*
egg_entry_buffer_new (void)
{
return g_object_new (EGG_TYPE_ENTRY_BUFFER, NULL);
}
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