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/*
* Seahorse
*
* Copyright (C) 2010 Stefan Walter
*
* This program 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 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
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "seahorse-secure-buffer.h"
#define GCR_API_SUBJECT_TO_CHANGE 1
#include <gcr/gcr.h>
#include <string.h>
/* Initial size of buffer, in bytes */
#define MIN_SIZE 16
struct _SeahorseSecureBufferPrivate
{
gchar *text;
gsize text_size;
gsize text_bytes;
guint text_chars;
};
G_DEFINE_TYPE (SeahorseSecureBuffer, seahorse_secure_buffer, GTK_TYPE_ENTRY_BUFFER);
/* --------------------------------------------------------------------------------
* SECURE IMPLEMENTATIONS OF TEXT BUFFER
*/
static const gchar*
seahorse_secure_buffer_real_get_text (GtkEntryBuffer *buffer, gsize *n_bytes)
{
SeahorseSecureBuffer *self = SEAHORSE_SECURE_BUFFER (buffer);
if (n_bytes)
*n_bytes = self->priv->text_bytes;
if (!self->priv->text)
return "";
return self->priv->text;
}
static guint
seahorse_secure_buffer_real_get_length (GtkEntryBuffer *buffer)
{
SeahorseSecureBuffer *self = SEAHORSE_SECURE_BUFFER (buffer);
return self->priv->text_chars;
}
static guint
seahorse_secure_buffer_real_insert_text (GtkEntryBuffer *buffer, guint position,
const gchar *chars, guint n_chars)
{
SeahorseSecureBuffer *self = SEAHORSE_SECURE_BUFFER (buffer);
SeahorseSecureBufferPrivate *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 = gcr_secure_memory_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
seahorse_secure_buffer_real_delete_text (GtkEntryBuffer *buffer, guint position, guint n_chars)
{
SeahorseSecureBuffer *self = SEAHORSE_SECURE_BUFFER (buffer);
SeahorseSecureBufferPrivate *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
seahorse_secure_buffer_init (SeahorseSecureBuffer *self)
{
SeahorseSecureBufferPrivate *pv;
pv = self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, SEAHORSE_TYPE_SECURE_BUFFER, SeahorseSecureBufferPrivate);
pv->text = NULL;
pv->text_chars = 0;
pv->text_bytes = 0;
pv->text_size = 0;
}
static void
seahorse_secure_buffer_finalize (GObject *obj)
{
SeahorseSecureBuffer *self = SEAHORSE_SECURE_BUFFER (obj);
SeahorseSecureBufferPrivate *pv = self->priv;
if (pv->text) {
gcr_secure_memory_free (pv->text);
pv->text = NULL;
pv->text_bytes = pv->text_size = 0;
pv->text_chars = 0;
}
G_OBJECT_CLASS (seahorse_secure_buffer_parent_class)->finalize (obj);
}
static void
seahorse_secure_buffer_class_init (SeahorseSecureBufferClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkEntryBufferClass *buffer_class = GTK_ENTRY_BUFFER_CLASS (klass);
gobject_class->finalize = seahorse_secure_buffer_finalize;
buffer_class->get_text = seahorse_secure_buffer_real_get_text;
buffer_class->get_length = seahorse_secure_buffer_real_get_length;
buffer_class->insert_text = seahorse_secure_buffer_real_insert_text;
buffer_class->delete_text = seahorse_secure_buffer_real_delete_text;
g_type_class_add_private (gobject_class, sizeof (SeahorseSecureBufferPrivate));
}
/* --------------------------------------------------------------------------------
*
*/
GtkEntryBuffer*
seahorse_secure_buffer_new (void)
{
return g_object_new (SEAHORSE_TYPE_SECURE_BUFFER, NULL);
}
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