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/* -*- 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-base.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);
}
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