Adding upstream version 43.9.upstream/43.9upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 191 insertions, 0 deletions

diff --git a/src/shell-secure-text-buffer.c b/src/shell-secure-text-buffer.c
new file mode 100644
index 0000000..8271410
--- /dev/null
+++ b/src/shell-secure-text-buffer.c
@@ -0,0 +1,191 @@
+/* -*- 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);
+}