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/usr/share/pygobject/2.0/defs/gio.override is in python-gobject-2-dev 2.28.6-12ubuntu1.

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The actual contents of the file can be viewed below.

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/* -*- Mode: C; c-basic-offset: 4 -*-
 * pygtk- Python bindings for the GTK toolkit.
 * Copyright (C) 2008  Johan Dahlin
 *
 *   gio.override: module wrapping the GIO library
 *
 * This library 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 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
 * 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 Street, Fifth Floor, Boston, MA 02110-1301
 * USA
 */
%%
modulename gio
%%
import gobject.GObject as PyGObject_Type
import glib.PollFD as PyGPollFD_Type
%%
headers
#define NO_IMPORT_PYGOBJECT
#include <pygobject.h>
#include <gio/gio.h>
#include "pygio-utils.h"
#include "pyglib.h"
#include "pygsource.h"

#define BUFSIZE 8192

typedef struct _PyGIONotify PyGIONotify;

struct _PyGIONotify {
    gboolean  referenced;
    PyObject *callback;
    PyObject *data;
    gboolean  attach_self;
    gpointer  buffer;
    gsize     buffer_size;

    /* If a structure has any 'slaves', those will reference their
     * callbacks and be freed together with the 'master'. */
    PyGIONotify *slaves;
};

static GQuark
pygio_notify_get_internal_quark(void)
{
    static GQuark quark = 0;
    if (!quark)
        quark = g_quark_from_string("pygio::notify");
    return quark;
}

static PyGIONotify *
pygio_notify_new(void)
{
    return g_slice_new0(PyGIONotify);
}

static PyGIONotify *
pygio_notify_new_slave(PyGIONotify* master)
{
    PyGIONotify *slave = pygio_notify_new();

    while (master->slaves)
        master = master->slaves;
    master->slaves = slave;

    return slave;
}

static gboolean
pygio_notify_using_optional_callback(PyGIONotify *notify)
{
    if (notify->callback)
        return TRUE;
    else {
        notify->data = NULL;
        return FALSE;
    }
}

static gboolean
pygio_notify_callback_is_valid_full(PyGIONotify *notify, const gchar *name)
{
    if (!notify->callback) {
        PyErr_SetString(PyExc_RuntimeError, "internal error: callback is not set");
        return FALSE;
    }

    if (!PyCallable_Check(notify->callback)) {
        gchar *error_message = g_strdup_printf("%s argument not callable", name);

	PyErr_SetString(PyExc_TypeError, error_message);
        g_free(error_message);
	return FALSE;
    }

    return TRUE;
}

static gboolean
pygio_notify_callback_is_valid(PyGIONotify *notify)
{
    return pygio_notify_callback_is_valid_full(notify, "callback");
}

static void
pygio_notify_reference_callback(PyGIONotify *notify)
{
    if (!notify->referenced) {
        notify->referenced = TRUE;
        Py_XINCREF(notify->callback);
        Py_XINCREF(notify->data);

        if (notify->slaves)
            pygio_notify_reference_callback(notify->slaves);
    }
}

static void
pygio_notify_copy_buffer(PyGIONotify *notify, gpointer buffer, gsize buffer_size)
{
    if (buffer_size > 0) {
	notify->buffer = g_slice_copy(buffer_size, buffer);
	notify->buffer_size = buffer_size;
    }
}

static gboolean
pygio_notify_allocate_buffer(PyGIONotify *notify, gsize buffer_size)
{
    if (buffer_size > 0) {
        notify->buffer = g_slice_alloc(buffer_size);
        if (!notify->buffer) {
            PyErr_Format(PyExc_MemoryError, "failed to allocate %" G_GSIZE_FORMAT " bytes", buffer_size);
            return FALSE;
        }

        notify->buffer_size = buffer_size;
    }

    return TRUE;
}

static void
pygio_notify_attach_to_result(PyGIONotify *notify)
{
    notify->attach_self = TRUE;
}

static PyGIONotify *
pygio_notify_get_attached(PyGObject *result)
{
    return g_object_get_qdata(G_OBJECT(result->obj), pygio_notify_get_internal_quark());
}

static void
pygio_notify_free(PyGIONotify *notify)
{
    if (notify) {
        if (notify->slaves)
            pygio_notify_free(notify->slaves);

        if (notify->referenced) {
            PyGILState_STATE state;

            state = pyg_gil_state_ensure();
            Py_XDECREF(notify->callback);
            Py_XDECREF(notify->data);
            pyg_gil_state_release(state);
        }

        if (notify->buffer)
            g_slice_free1(notify->buffer_size, notify->buffer);

        g_slice_free(PyGIONotify, notify);
    }
}

static void
async_result_callback_marshal(GObject *source_object,
			      GAsyncResult *result,
			      PyGIONotify *notify)
{
    PyObject *ret;
    PyGILState_STATE state;

    state = pyg_gil_state_ensure();

    if (!notify->referenced)
        g_warning("pygio_notify_reference_callback() hasn't been called before using the structure");

    if (notify->attach_self) {
        g_object_set_qdata_full(G_OBJECT(result), pygio_notify_get_internal_quark(),
                                notify, (GDestroyNotify) pygio_notify_free);
    }

    if (notify->data)
	ret = PyEval_CallFunction(notify->callback, "NNO",
				  pygobject_new(source_object),
				  pygobject_new((GObject *)result),
				  notify->data);
    else
	ret = PyObject_CallFunction(notify->callback, "NN",
				    pygobject_new(source_object),
				    pygobject_new((GObject *)result));

    if (ret == NULL) {
	PyErr_Print();
	PyErr_Clear();
    }

    Py_XDECREF(ret);

    /* Otherwise the structure is attached to 'result' and will be
     * freed when that object dies. */
    if (!notify->attach_self)
        pygio_notify_free(notify);

    pyg_gil_state_release(state);
}
%%
include
  gappinfo.override
  gapplaunchcontext.override
  gbufferedinputstream.override
  gcancellable.override
  gdatainputstream.override
  gdrive.override
  gfile.override
  gfileattribute.override
  gfileenumerator.override
  gfileinfo.override
  gfileinputstream.override
  gfileiostream.override
  gfileoutputstream.override
  gicon.override
  giostream.override
  gmemoryinputstream.override
  gmemoryoutputstream.override
  gmount.override
  ginputstream.override
  goutputstream.override
  gresolver.override
  gsocket.override
  gvolume.override
  gvolumemonitor.override
%%
ignore-glob
  *_get_type
  *free
  *_ref
  *_unref
  g_async_result_get_user_data
  g_file_new_from_commandline_arg
  g_file_new_from_path
  g_file_new_from_uri
  g_file_hash
  g_io_error_quark
  g_simple_async_result_new_error
  g_simple_async_report_error_in_idle
  g_simple_async_result_set_op_res_gpointer
  g_simple_async_result_get_op_res_gpointer
  g_simple_async_result_get_source_tag
  g_simple_async_result_run_in_thread
  g_simple_async_result_set_from_error
  g_simple_async_result_set_error
  g_simple_async_result_set_error_va
  g_io_module*
  g_io_scheduler_*
%%
override g_app_info_get_all noargs
static PyObject *
_wrap_g_app_info_get_all (PyGObject *self)
{
  GList *list, *l;
  PyObject *ret;

  list = g_app_info_get_all ();

  ret = PyList_New(0);
  for (l = list; l; l = l->next) {
    GObject *obj = l->data;
    PyObject *item = pygobject_new(obj);
    PyList_Append(ret, item);
    Py_DECREF(item);
  }
  g_list_free(list);

  return ret;
}
%%
override g_app_info_get_all_for_type args
static PyObject *
_wrap_g_app_info_get_all_for_type (PyGObject *self, PyObject *args)
{
  GList *list, *l;
  PyObject *ret;
  gchar *type;

  if (!PyArg_ParseTuple (args, "s:app_info_get_all_for_type", &type))
    return NULL;

  list = g_app_info_get_all_for_type (type);

  ret = PyList_New(0);
  for (l = list; l; l = l->next) {
    GObject *obj = l->data;
    PyObject *item = pygobject_new(obj);
    PyList_Append(ret, item);
    Py_DECREF(item);
  }
  g_list_free(list);

  return ret;
}
%%
override g_content_type_guess kwargs
static PyObject *
_wrap_g_content_type_guess(PyGObject *self, PyObject *args, PyObject *kwargs)
{
    char *kwlist[] = {"filename", "data", "want_uncertain", NULL};
    char *filename = NULL, *data = NULL, *type;
#ifdef PY_SSIZE_T_CLEAN
    Py_ssize_t data_size = 0;
#else
    int data_size = 0;
#endif

    gboolean result_uncertain, want_uncertain = FALSE;
    PyObject *ret;

    if (!PyArg_ParseTupleAndKeywords (args, kwargs,
				      "|zz#i:g_content_type_guess",
				      kwlist,
				      &filename, &data, &data_size,
				      &want_uncertain))
      return NULL;

    if (!filename && !data) {
      PyErr_SetString(PyExc_TypeError, "need at least one argument");
      return NULL;
    }

    type = g_content_type_guess(filename, (guchar *) data,
				data_size, &result_uncertain);

    if (want_uncertain) {
	ret = Py_BuildValue("zN", type, PyBool_FromLong(result_uncertain));
    
    } else {
        ret = PyString_FromString(type);
    }

    g_free(type);
    return ret;
}
%%
override g_vfs_get_supported_uri_schemes noargs
static PyObject *
_wrap_g_vfs_get_supported_uri_schemes(PyGObject *self)
{
    const char * const *names;
    PyObject *ret;

    names = g_vfs_get_supported_uri_schemes(G_VFS(self->obj));

    ret = PyList_New(0);
    while (names && *names) {
        PyObject *item = PyString_FromString(names[0]);
        PyList_Append(ret, item);
        Py_DECREF(item);

        names++;
    }

    return ret;
}
%%
override g_content_types_get_registered noargs
static PyObject *
_wrap_g_content_types_get_registered(PyObject *self)
{
    GList *list, *l;
    PyObject *ret;

    list = g_content_types_get_registered();

    ret = PyList_New(0);
    for (l = list; l; l = l->next) {
	char *content_type = l->data;
	PyObject *string = PyString_FromString(content_type);
	PyList_Append(ret, string);
	Py_DECREF(string);
	g_free(content_type);
    }
    g_list_free(list);

    return ret;
}