[gtksourceview/wip/loader-saver: 5/7] Add GtkSourceBufferInputStream private class



commit 1531c8df71c33aeb0a82df8d783c333015d3c957
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Dec 6 22:45:26 2013 +0100

    Add GtkSourceBufferInputStream private class
    
    Taken from the gedit source code, GeditDocumentInputStream.

 gtksourceview/Makefile.am                  |    2 +
 gtksourceview/gtksourcebuffer.h            |    7 +
 gtksourceview/gtksourcebufferinputstream.c |  486 ++++++++++++++++++++++++++++
 gtksourceview/gtksourcebufferinputstream.h |   71 ++++
 gtksourceview/gtksourcetypes-private.h     |    1 +
 po/POTFILES.in                             |    1 +
 6 files changed, 568 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/Makefile.am b/gtksourceview/Makefile.am
index 618ce37..a3c6c1a 100644
--- a/gtksourceview/Makefile.am
+++ b/gtksourceview/Makefile.am
@@ -52,6 +52,7 @@ libgtksourceview_headers =                    \
 
 libgtksourceview_private_headers = \
        gtksourcebuffer-private.h               \
+       gtksourcebufferinputstream.h            \
        gtksourcecompletioncontainer.h          \
        gtksourcecompletionmodel.h              \
        gtksourcecompletion-private.h           \
@@ -73,6 +74,7 @@ libgtksourceview_private_headers = \
        gtktextregion.h
 
 libgtksourceview_private_c_files = \
+       gtksourcebufferinputstream.c    \
        gtksourcecompletioncontainer.c  \
        gtksourcecompletionmodel.c      \
        gtksourcecontextengine.c        \
diff --git a/gtksourceview/gtksourcebuffer.h b/gtksourceview/gtksourcebuffer.h
index f04facb..17c7a63 100644
--- a/gtksourceview/gtksourcebuffer.h
+++ b/gtksourceview/gtksourcebuffer.h
@@ -73,6 +73,13 @@ typedef enum
        GTK_SOURCE_CHANGE_CASE_TITLE
 } GtkSourceChangeCaseType;
 
+typedef enum
+{
+       GTK_SOURCE_NEWLINE_TYPE_LF,
+       GTK_SOURCE_NEWLINE_TYPE_CR,
+       GTK_SOURCE_NEWLINE_TYPE_CR_LF
+} GtkSourceNewlineType;
+
 struct _GtkSourceBuffer
 {
        GtkTextBuffer parent_instance;
diff --git a/gtksourceview/gtksourcebufferinputstream.c b/gtksourceview/gtksourcebufferinputstream.c
new file mode 100644
index 0000000..4996293
--- /dev/null
+++ b/gtksourceview/gtksourcebufferinputstream.c
@@ -0,0 +1,486 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; coding: utf-8 -*- */
+/* gtksourcebufferinputstream.c
+ * This file is part of GtkSourceView
+ *
+ * Copyright (C) 2010 - Ignacio Casal Quinteiro
+ * Copyright (C) 2013 - Sébastien Wilmet <swilmet gnome org>
+ *
+ * GtkSourceView 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.
+ *
+ * GtkSourceView 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 library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <glib.h>
+#include <gio/gio.h>
+#include <string.h>
+#include "gtksourcebufferinputstream.h"
+#include "gtksourceview-typebuiltins.h"
+
+/* NOTE: never use async methods on this stream, the stream is just
+ * a wrapper around GtkTextBuffer api so that we can use GIO Stream
+ * methods, but the underlying code operates on a GtkTextBuffer, so
+ * there is no I/O involved and should be accessed only by the main
+ * thread.
+ */
+
+struct _GtkSourceBufferInputStreamPrivate
+{
+       GtkTextBuffer *buffer;
+       GtkTextMark *pos;
+       gint bytes_partial;
+
+       GtkSourceNewlineType newline_type;
+
+       guint newline_added : 1;
+       guint is_initialized : 1;
+       guint ensure_trailing_newline : 1;
+};
+
+enum
+{
+       PROP_0,
+       PROP_BUFFER,
+       PROP_NEWLINE_TYPE,
+       PROP_ENSURE_TRAILING_NEWLINE
+};
+
+G_DEFINE_TYPE_WITH_PRIVATE (GtkSourceBufferInputStream, _gtk_source_buffer_input_stream, 
G_TYPE_INPUT_STREAM);
+
+static gsize
+get_new_line_size (GtkSourceBufferInputStream *stream)
+{
+       switch (stream->priv->newline_type)
+       {
+               case GTK_SOURCE_NEWLINE_TYPE_CR:
+               case GTK_SOURCE_NEWLINE_TYPE_LF:
+                       return 1;
+
+               case GTK_SOURCE_NEWLINE_TYPE_CR_LF:
+                       return 2;
+
+               default:
+                       g_warn_if_reached ();
+                       break;
+       }
+
+       return 1;
+}
+
+static const gchar *
+get_new_line (GtkSourceBufferInputStream *stream)
+{
+       switch (stream->priv->newline_type)
+       {
+               case GTK_SOURCE_NEWLINE_TYPE_LF:
+                       return "\n";
+
+               case GTK_SOURCE_NEWLINE_TYPE_CR:
+                       return "\r";
+
+               case GTK_SOURCE_NEWLINE_TYPE_CR_LF:
+                       return "\r\n";
+
+               default:
+                       g_warn_if_reached ();
+                       break;
+       }
+
+       return "\n";
+}
+
+static gsize
+read_line (GtkSourceBufferInputStream *stream,
+          gchar                      *outbuf,
+          gsize                       space_left)
+{
+       GtkTextIter start, next, end;
+       gchar *buf;
+       gint bytes; /* int since it's what iter_get_offset returns */
+       gsize bytes_to_write, newline_size, read;
+       const gchar *newline;
+       gboolean is_last;
+
+       gtk_text_buffer_get_iter_at_mark (stream->priv->buffer,
+                                         &start,
+                                         stream->priv->pos);
+
+       if (gtk_text_iter_is_end (&start))
+       {
+               return 0;
+       }
+
+       end = next = start;
+       newline = get_new_line (stream);
+
+       /* Check needed for empty lines */
+       if (!gtk_text_iter_ends_line (&end))
+       {
+               gtk_text_iter_forward_to_line_end (&end);
+       }
+
+       gtk_text_iter_forward_line (&next);
+
+       buf = gtk_text_iter_get_slice (&start, &end);
+
+       /* the bytes of a line includes also the newline, so with the
+          offsets we remove the newline and we add the new newline size */
+       bytes = gtk_text_iter_get_bytes_in_line (&start) - stream->priv->bytes_partial;
+
+       /* bytes_in_line includes the newlines, so we remove that assuming that
+          they are single byte characters */
+       bytes -= gtk_text_iter_get_offset (&next) - gtk_text_iter_get_offset (&end);
+       is_last = gtk_text_iter_is_end (&end);
+
+       /* bytes_to_write contains the amount of bytes we would like to write.
+          This means its the amount of bytes in the line (without the newline
+          in the buffer) + the amount of bytes for the newline we want to
+          write (newline_size) */
+       bytes_to_write = bytes;
+
+       /* do not add the new newline_size for the last line */
+       newline_size = get_new_line_size (stream);
+       if (!is_last)
+       {
+               bytes_to_write += newline_size;
+       }
+
+       if (bytes_to_write > space_left)
+       {
+               gchar *ptr;
+               gint char_offset;
+               gint written;
+               gsize to_write;
+
+               /* Here the line does not fit in the buffer, we thus write
+                  the amount of bytes we can still fit, storing the position
+                  for the next read with the mark. Do not try to write the
+                  new newline in this case, it will be handled in the next
+                  iteration */
+               to_write = MIN (space_left, bytes);
+               ptr = buf;
+               written = 0;
+               char_offset = 0;
+
+               while (written < to_write)
+               {
+                       gint w;
+
+                       ptr = g_utf8_next_char (ptr);
+                       w = (ptr - buf);
+                       if (w > to_write)
+                       {
+                               break;
+                       }
+                       else
+                       {
+                               written = w;
+                               ++char_offset;
+                       }
+               }
+
+               memcpy (outbuf, buf, written);
+
+               /* Note: offset is one past what we wrote */
+               gtk_text_iter_forward_chars (&start, char_offset);
+               stream->priv->bytes_partial += written;
+               read = written;
+       }
+       else
+       {
+               /* First just copy the bytes without the newline */
+               memcpy (outbuf, buf, bytes);
+
+               /* Then add the newline, but not for the last line */
+               if (!is_last)
+               {
+                       memcpy (outbuf + bytes, newline, newline_size);
+               }
+
+               start = next;
+               stream->priv->bytes_partial = 0;
+               read = bytes_to_write;
+       }
+
+       gtk_text_buffer_move_mark (stream->priv->buffer,
+                                  stream->priv->pos,
+                                  &start);
+
+       g_free (buf);
+       return read;
+}
+
+static gssize
+_gtk_source_buffer_input_stream_read (GInputStream  *input_stream,
+                                     void          *buffer,
+                                     gsize          count,
+                                     GCancellable  *cancellable,
+                                     GError       **error)
+{
+       GtkSourceBufferInputStream *stream;
+       GtkTextIter iter;
+       gssize space_left, read, n;
+
+       stream = GTK_SOURCE_BUFFER_INPUT_STREAM (input_stream);
+
+       if (count < 6)
+       {
+               g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NO_SPACE,
+                                    "Not enougth space in destination");
+               return -1;
+       }
+
+       if (g_cancellable_set_error_if_cancelled (cancellable, error))
+       {
+               return -1;
+       }
+
+       /* Initialize the mark to the first char in the text buffer */
+       if (!stream->priv->is_initialized)
+       {
+               gtk_text_buffer_get_start_iter (stream->priv->buffer, &iter);
+               stream->priv->pos = gtk_text_buffer_create_mark (stream->priv->buffer,
+                                                                NULL,
+                                                                &iter,
+                                                                FALSE);
+
+               stream->priv->is_initialized = TRUE;
+       }
+
+       space_left = count;
+       read = 0;
+
+       do
+       {
+               n = read_line (stream, (gchar *)buffer + read, space_left);
+               read += n;
+               space_left -= n;
+       } while (space_left > 0 && n != 0 && stream->priv->bytes_partial == 0);
+
+       /* Make sure that non-empty files are always terminated with \n (see bug #95676).
+        * Note that we strip the trailing \n when loading the file */
+       gtk_text_buffer_get_iter_at_mark (stream->priv->buffer,
+                                         &iter,
+                                         stream->priv->pos);
+
+       if (gtk_text_iter_is_end (&iter) &&
+           !gtk_text_iter_is_start (&iter) &&
+           stream->priv->ensure_trailing_newline)
+       {
+               gssize newline_size;
+
+               newline_size = get_new_line_size (stream);
+
+               if (space_left >= newline_size &&
+                   !stream->priv->newline_added)
+               {
+                       const gchar *newline;
+
+                       newline = get_new_line (stream);
+
+                       memcpy ((gchar *)buffer + read, newline, newline_size);
+
+                       read += newline_size;
+                       stream->priv->newline_added = TRUE;
+               }
+       }
+
+       return read;
+}
+
+static gboolean
+_gtk_source_buffer_input_stream_close (GInputStream  *input_stream,
+                                      GCancellable  *cancellable,
+                                      GError       **error)
+{
+       GtkSourceBufferInputStream *stream = GTK_SOURCE_BUFFER_INPUT_STREAM (input_stream);
+
+       stream->priv->newline_added = FALSE;
+
+       if (stream->priv->is_initialized)
+       {
+               gtk_text_buffer_delete_mark (stream->priv->buffer, stream->priv->pos);
+       }
+
+       return TRUE;
+}
+
+static void
+_gtk_source_buffer_input_stream_set_property (GObject      *object,
+                                             guint         prop_id,
+                                             const GValue *value,
+                                             GParamSpec   *pspec)
+{
+       GtkSourceBufferInputStream *stream = GTK_SOURCE_BUFFER_INPUT_STREAM (object);
+
+       switch (prop_id)
+       {
+               case PROP_BUFFER:
+                       stream->priv->buffer = GTK_TEXT_BUFFER (g_value_get_object (value));
+                       break;
+
+               case PROP_NEWLINE_TYPE:
+                       stream->priv->newline_type = g_value_get_enum (value);
+                       break;
+
+               case PROP_ENSURE_TRAILING_NEWLINE:
+                       stream->priv->ensure_trailing_newline = g_value_get_boolean (value);
+                       break;
+
+               default:
+                       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+                       break;
+       }
+}
+
+static void
+_gtk_source_buffer_input_stream_get_property (GObject    *object,
+                                         guint       prop_id,
+                                         GValue     *value,
+                                         GParamSpec *pspec)
+{
+       GtkSourceBufferInputStream *stream = GTK_SOURCE_BUFFER_INPUT_STREAM (object);
+
+       switch (prop_id)
+       {
+               case PROP_BUFFER:
+                       g_value_set_object (value, stream->priv->buffer);
+                       break;
+
+               case PROP_NEWLINE_TYPE:
+                       g_value_set_enum (value, stream->priv->newline_type);
+                       break;
+
+               case PROP_ENSURE_TRAILING_NEWLINE:
+                       g_value_set_boolean (value, stream->priv->ensure_trailing_newline);
+                       break;
+
+               default:
+                       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+                       break;
+       }
+}
+
+static void
+_gtk_source_buffer_input_stream_class_init (GtkSourceBufferInputStreamClass *klass)
+{
+       GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+       GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
+
+       gobject_class->get_property = _gtk_source_buffer_input_stream_get_property;
+       gobject_class->set_property = _gtk_source_buffer_input_stream_set_property;
+
+       stream_class->read_fn = _gtk_source_buffer_input_stream_read;
+       stream_class->close_fn = _gtk_source_buffer_input_stream_close;
+
+       g_object_class_install_property (gobject_class,
+                                        PROP_BUFFER,
+                                        g_param_spec_object ("buffer",
+                                                             "Buffer",
+                                                             "The buffer to read",
+                                                             GTK_TYPE_TEXT_BUFFER,
+                                                             G_PARAM_READWRITE |
+                                                             G_PARAM_CONSTRUCT_ONLY |
+                                                             G_PARAM_STATIC_STRINGS));
+
+       /**
+        * GtkSourceBufferInputStream:newline-type:
+        *
+        * The :newline-type property determines what is considered
+        * as a line ending when reading complete lines from the stream.
+        */
+       g_object_class_install_property (gobject_class,
+                                        PROP_NEWLINE_TYPE,
+                                        g_param_spec_enum ("newline-type",
+                                                           "Newline type",
+                                                           "The accepted type of line ending",
+                                                           GTK_SOURCE_TYPE_NEWLINE_TYPE,
+                                                           GTK_SOURCE_NEWLINE_TYPE_LF,
+                                                           G_PARAM_READWRITE |
+                                                           G_PARAM_STATIC_STRINGS |
+                                                           G_PARAM_CONSTRUCT_ONLY));
+
+       /**
+        * GtkSourceBufferInputStream:ensure-trailing-newline:
+        *
+        * The :ensure-trailing-newline property specifies whether or not to
+        * ensure (enforce) the buffer ends with a trailing newline.
+        */
+       g_object_class_install_property (gobject_class,
+                                        PROP_ENSURE_TRAILING_NEWLINE,
+                                        g_param_spec_boolean ("ensure-trailing-newline",
+                                                              "Ensure Trailing Newline",
+                                                              "Ensure the buffer ends with a trailing 
newline",
+                                                              TRUE,
+                                                              G_PARAM_READWRITE |
+                                                              G_PARAM_STATIC_STRINGS |
+                                                              G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+_gtk_source_buffer_input_stream_init (GtkSourceBufferInputStream *stream)
+{
+       stream->priv = _gtk_source_buffer_input_stream_get_instance_private (stream);
+}
+
+/**
+ * _gtk_source_buffer_input_stream_new:
+ * @buffer: a #GtkTextBuffer
+ *
+ * Reads the data from @buffer.
+ *
+ * Returns: a new #GInputStream to read @buffer
+ */
+GInputStream *
+_gtk_source_buffer_input_stream_new (GtkTextBuffer        *buffer,
+                                    GtkSourceNewlineType  type,
+                                    gboolean              ensure_trailing_newline)
+{
+       g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
+
+       return g_object_new (GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM,
+                            "buffer", buffer,
+                            "newline-type", type,
+                            "ensure-trailing-newline", ensure_trailing_newline,
+                            NULL);
+}
+
+gsize
+_gtk_source_buffer_input_stream_get_total_size (GtkSourceBufferInputStream *stream)
+{
+       g_return_val_if_fail (GTK_SOURCE_IS_BUFFER_INPUT_STREAM (stream), 0);
+
+       return gtk_text_buffer_get_char_count (stream->priv->buffer);
+}
+
+gsize
+_gtk_source_buffer_input_stream_tell (GtkSourceBufferInputStream *stream)
+{
+       g_return_val_if_fail (GTK_SOURCE_IS_BUFFER_INPUT_STREAM (stream), 0);
+
+       /* FIXME: is this potentially inefficient? If yes, we could keep
+          track of the offset internally, assuming the mark doesn't move
+          during the operation */
+       if (!stream->priv->is_initialized)
+       {
+               return 0;
+       }
+       else
+       {
+               GtkTextIter iter;
+
+               gtk_text_buffer_get_iter_at_mark (stream->priv->buffer,
+                                                 &iter,
+                                                 stream->priv->pos);
+               return gtk_text_iter_get_offset (&iter);
+       }
+}
diff --git a/gtksourceview/gtksourcebufferinputstream.h b/gtksourceview/gtksourcebufferinputstream.h
new file mode 100644
index 0000000..1134f10
--- /dev/null
+++ b/gtksourceview/gtksourcebufferinputstream.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; coding: utf-8 -*- */
+/* gtksourcebufferinputstream.h
+ * This file is part of GtkSourceView
+ *
+ * Copyright (C) 2010 - Ignacio Casal Quinteiro
+ * Copyright (C) 2013 - Sébastien Wilmet <swilmet gnome org>
+ *
+ * GtkSourceView 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.
+ *
+ * GtkSourceView 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 library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __GTK_SOURCE_BUFFER_INPUT_STREAM_H__
+#define __GTK_SOURCE_BUFFER_INPUT_STREAM_H__
+
+#include <gio/gio.h>
+#include <gtk/gtk.h>
+#include "gtksourcetypes-private.h"
+#include "gtksourcebuffer.h"
+
+G_BEGIN_DECLS
+
+#define GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM            (_gtk_source_buffer_input_stream_get_type ())
+#define GTK_SOURCE_BUFFER_INPUT_STREAM(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM, GtkSourceBufferInputStream))
+#define GTK_SOURCE_BUFFER_INPUT_STREAM_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), 
GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM, GtkSourceBufferInputStreamClass))
+#define GTK_SOURCE_IS_BUFFER_INPUT_STREAM(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 
GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM))
+#define GTK_SOURCE_IS_BUFFER_INPUT_STREAM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), 
GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM))
+#define GTK_SOURCE_BUFFER_INPUT_STREAM_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), 
GTK_SOURCE_TYPE_BUFFER_INPUT_STREAM, GtkSourceBufferInputStreamClass))
+
+typedef struct _GtkSourceBufferInputStreamClass                GtkSourceBufferInputStreamClass;
+typedef struct _GtkSourceBufferInputStreamPrivate      GtkSourceBufferInputStreamPrivate;
+
+struct _GtkSourceBufferInputStream
+{
+       GInputStream parent;
+
+       GtkSourceBufferInputStreamPrivate *priv;
+};
+
+struct _GtkSourceBufferInputStreamClass
+{
+       GInputStreamClass parent_class;
+};
+
+G_GNUC_INTERNAL
+GType           _gtk_source_buffer_input_stream_get_type               (void) G_GNUC_CONST;
+
+G_GNUC_INTERNAL
+GInputStream   *_gtk_source_buffer_input_stream_new                    (GtkTextBuffer              *buffer,
+                                                                        GtkSourceNewlineType        type,
+                                                                        gboolean                    
ensure_trailing_newline);
+
+G_GNUC_INTERNAL
+gsize           _gtk_source_buffer_input_stream_get_total_size         (GtkSourceBufferInputStream *stream);
+
+G_GNUC_INTERNAL
+gsize           _gtk_source_buffer_input_stream_tell                   (GtkSourceBufferInputStream *stream);
+
+G_END_DECLS
+
+#endif /* __GTK_SOURCE_BUFFER_INPUT_STREAM_H__ */
diff --git a/gtksourceview/gtksourcetypes-private.h b/gtksourceview/gtksourcetypes-private.h
index afb1c8a..4489548 100644
--- a/gtksourceview/gtksourcetypes-private.h
+++ b/gtksourceview/gtksourcetypes-private.h
@@ -26,6 +26,7 @@
 
 G_BEGIN_DECLS
 
+typedef struct _GtkSourceBufferInputStream     GtkSourceBufferInputStream;
 typedef struct _GtkSourceCompletionContainer   GtkSourceCompletionContainer;
 typedef struct _GtkSourceCompletionModel       GtkSourceCompletionModel;
 typedef struct _GtkSourceContextEngine         GtkSourceContextEngine;
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 944e802..2ac3319 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -114,6 +114,7 @@ data/styles/oblivion.xml
 data/styles/tango.xml
 gtksourceview/completion-providers/words/gtksourcecompletionwords.c
 gtksourceview/gtksourcebuffer.c
+gtksourceview/gtksourcebufferinputstream.c
 gtksourceview/gtksourcecompletion.c
 gtksourceview/gtksourcecompletioncontainer.c
 gtksourceview/gtksourcecompletioncontext.c


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