Commit bd0b8c60 authored by Alexander Larsson's avatar Alexander Larsson

Add GFileIOStream class

This is similar to GFileInputStream and GFileOutputStream for GIOStreams.
The default implementations chain to the Output stream.
parent 6d0bebb7
......@@ -199,6 +199,7 @@ libgio_2_0_la_SOURCES = \
gfilemonitor.c \
gfilenamecompleter.c \
gfileoutputstream.c \
gfileiostream.c \
gfilterinputstream.c \
gfilteroutputstream.c \
gicon.c \
......@@ -315,6 +316,7 @@ gio_headers = \
gfilemonitor.h \
gfilenamecompleter.h \
gfileoutputstream.h \
gfileiostream.h \
gfilterinputstream.h \
gfilteroutputstream.h \
gicon.h \
......
/* GIO - GLib Input, IO and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* 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 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., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <glib.h>
#include <gfileiostream.h>
#include <gseekable.h>
#include "gsimpleasyncresult.h"
#include "gasyncresult.h"
#include "gcancellable.h"
#include "gioerror.h"
#include "gfileoutputstream.h"
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gfileiostream
* @short_description: read write streams for File
* @include: gio/gio.h
* @see_also: #GIOStream, #GFileInputStream, #GFileOutputStream, #GSeekable
*
* GFileIOStream provides io streams that both read and write to the same
* file handle.
*
* GFileIOStream implements #GSeekable, which allows the io
* stream to jump to arbitrary positions in the file and to truncate
* the file, provided the filesystem of the file supports these
* operations. In addition to the generic g_seekable_ API,
* GFileIOStream has its own API for seeking and positioning.
* To find the position of a file io stream, use
* g_file_io_stream_tell(). To find out if a file io
* stream supports seeking, use g_file_io_stream_can_seek().
* To position a file io stream, use g_file_io_stream_seek().
* To find out if a file io stream supports truncating, use
* g_file_io_stream_can_truncate(). To truncate a file io
* stream, use g_file_io_stream_truncate().
*
* Since: 2.22
**/
static void g_file_io_stream_seekable_iface_init (GSeekableIface *iface);
static goffset g_file_io_stream_seekable_tell (GSeekable *seekable);
static gboolean g_file_io_stream_seekable_can_seek (GSeekable *seekable);
static gboolean g_file_io_stream_seekable_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error);
static gboolean g_file_io_stream_seekable_can_truncate (GSeekable *seekable);
static gboolean g_file_io_stream_seekable_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error);
static void g_file_io_stream_real_query_info_async (GFileIOStream *stream,
const char *attributes,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
static GFileInfo *g_file_io_stream_real_query_info_finish (GFileIOStream *stream,
GAsyncResult *result,
GError **error);
G_DEFINE_TYPE_WITH_CODE (GFileIOStream, g_file_io_stream, G_TYPE_IO_STREAM,
G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
g_file_io_stream_seekable_iface_init));
struct _GFileIOStreamPrivate {
GAsyncReadyCallback outstanding_callback;
};
static void
g_file_io_stream_seekable_iface_init (GSeekableIface *iface)
{
iface->tell = g_file_io_stream_seekable_tell;
iface->can_seek = g_file_io_stream_seekable_can_seek;
iface->seek = g_file_io_stream_seekable_seek;
iface->can_truncate = g_file_io_stream_seekable_can_truncate;
iface->truncate_fn = g_file_io_stream_seekable_truncate;
}
static void
g_file_io_stream_init (GFileIOStream *stream)
{
stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
G_TYPE_FILE_IO_STREAM,
GFileIOStreamPrivate);
}
/**
* g_file_io_stream_query_info:
* @stream: a #GFileIOStream.
* @attributes: a file attribute query string.
* @cancellable: optional #GCancellable object, %NULL to ignore.
* @error: a #GError, %NULL to ignore.
*
* Queries a file io stream for the given @attributes.
* This function blocks while querying the stream. For the asynchronous
* version of this function, see g_file_io_stream_query_info_async().
* While the stream is blocked, the stream will set the pending flag
* internally, and any other operations on the stream will fail with
* %G_IO_ERROR_PENDING.
*
* Can fail if the stream was already closed (with @error being set to
* %G_IO_ERROR_CLOSED), the stream has pending operations (with @error being
* set to %G_IO_ERROR_PENDING), or if querying info is not supported for
* the stream's interface (with @error being set to %G_IO_ERROR_NOT_SUPPORTED). I
* all cases of failure, %NULL will be returned.
*
* If @cancellable is not %NULL, then the operation can be cancelled by
* triggering the cancellable object from another thread. If the operation
* was cancelled, the error %G_IO_ERROR_CANCELLED will be set, and %NULL will
* be returned.
*
* Returns: a #GFileInfo for the @stream, or %NULL on error.
*
* Since: 2.22
**/
GFileInfo *
g_file_io_stream_query_info (GFileIOStream *stream,
const char *attributes,
GCancellable *cancellable,
GError **error)
{
GFileIOStreamClass *class;
GIOStream *io_stream;
GFileInfo *info;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), NULL);
io_stream = G_IO_STREAM (stream);
if (!g_io_stream_set_pending (io_stream, error))
return NULL;
info = NULL;
if (cancellable)
g_cancellable_push_current (cancellable);
class = G_FILE_IO_STREAM_GET_CLASS (stream);
if (class->query_info)
info = class->query_info (stream, attributes, cancellable, error);
else
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Stream doesn't support query_info"));
if (cancellable)
g_cancellable_pop_current (cancellable);
g_io_stream_clear_pending (io_stream);
return info;
}
static void
async_ready_callback_wrapper (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GFileIOStream *stream = G_FILE_IO_STREAM (source_object);
g_io_stream_clear_pending (G_IO_STREAM (stream));
if (stream->priv->outstanding_callback)
(*stream->priv->outstanding_callback) (source_object, res, user_data);
g_object_unref (stream);
}
/**
* g_file_io_stream_query_info_async:
* @stream: a #GFileIOStream.
* @attributes: a file attribute query string.
* @io_priority: the <link linkend="gio-GIOScheduler">I/O priority</link>
* of the request.
* @cancellable: optional #GCancellable object, %NULL to ignore.
* @callback: callback to call when the request is satisfied
* @user_data: the data to pass to callback function
*
* Asynchronously queries the @stream for a #GFileInfo. When completed,
* @callback will be called with a #GAsyncResult which can be used to
* finish the operation with g_file_io_stream_query_info_finish().
*
* For the synchronous version of this function, see
* g_file_io_stream_query_info().
*
* Since: 2.22
**/
void
g_file_io_stream_query_info_async (GFileIOStream *stream,
const char *attributes,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GFileIOStreamClass *klass;
GIOStream *io_stream;
GError *error = NULL;
g_return_if_fail (G_IS_FILE_IO_STREAM (stream));
io_stream = G_IO_STREAM (stream);
if (!g_io_stream_set_pending (io_stream, &error))
{
g_simple_async_report_gerror_in_idle (G_OBJECT (stream),
callback,
user_data,
error);
g_error_free (error);
return;
}
klass = G_FILE_IO_STREAM_GET_CLASS (stream);
stream->priv->outstanding_callback = callback;
g_object_ref (stream);
klass->query_info_async (stream, attributes, io_priority, cancellable,
async_ready_callback_wrapper, user_data);
}
/**
* g_file_io_stream_query_info_finish:
* @stream: a #GFileIOStream.
* @result: a #GAsyncResult.
* @error: a #GError, %NULL to ignore.
*
* Finalizes the asynchronous query started
* by g_file_io_stream_query_info_async().
*
* Returns: A #GFileInfo for the finished query.
*
* Since: 2.22
**/
GFileInfo *
g_file_io_stream_query_info_finish (GFileIOStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
GFileIOStreamClass *class;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), NULL);
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), NULL);
if (G_IS_SIMPLE_ASYNC_RESULT (result))
{
simple = G_SIMPLE_ASYNC_RESULT (result);
if (g_simple_async_result_propagate_error (simple, error))
return NULL;
}
class = G_FILE_IO_STREAM_GET_CLASS (stream);
return class->query_info_finish (stream, result, error);
}
/**
* g_file_io_stream_get_etag:
* @stream: a #GFileIOStream.
*
* Gets the entity tag for the file when it has been written.
* This must be called after the stream has been written
* and closed, as the etag can change while writing.
*
* Returns: the entity tag for the stream.
*
* Since: 2.22
**/
char *
g_file_io_stream_get_etag (GFileIOStream *stream)
{
GFileIOStreamClass *class;
GIOStream *io_stream;
char *etag;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), NULL);
io_stream = G_IO_STREAM (stream);
if (!g_io_stream_is_closed (io_stream))
{
g_warning ("stream is not closed yet, can't get etag");
return NULL;
}
etag = NULL;
class = G_FILE_IO_STREAM_GET_CLASS (stream);
if (class->get_etag)
etag = class->get_etag (stream);
return etag;
}
static goffset
g_file_io_stream_tell (GFileIOStream *stream)
{
GFileIOStreamClass *class;
goffset offset;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), 0);
class = G_FILE_IO_STREAM_GET_CLASS (stream);
offset = 0;
if (class->tell)
offset = class->tell (stream);
return offset;
}
static goffset
g_file_io_stream_seekable_tell (GSeekable *seekable)
{
return g_file_io_stream_tell (G_FILE_IO_STREAM (seekable));
}
static gboolean
g_file_io_stream_can_seek (GFileIOStream *stream)
{
GFileIOStreamClass *class;
gboolean can_seek;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), FALSE);
class = G_FILE_IO_STREAM_GET_CLASS (stream);
can_seek = FALSE;
if (class->seek)
{
can_seek = TRUE;
if (class->can_seek)
can_seek = class->can_seek (stream);
}
return can_seek;
}
static gboolean
g_file_io_stream_seekable_can_seek (GSeekable *seekable)
{
return g_file_io_stream_can_seek (G_FILE_IO_STREAM (seekable));
}
static gboolean
g_file_io_stream_seek (GFileIOStream *stream,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GFileIOStreamClass *class;
GIOStream *io_stream;
gboolean res;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), FALSE);
io_stream = G_IO_STREAM (stream);
class = G_FILE_IO_STREAM_GET_CLASS (stream);
if (!class->seek)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Seek not supported on stream"));
return FALSE;
}
if (!g_io_stream_set_pending (io_stream, error))
return FALSE;
if (cancellable)
g_cancellable_push_current (cancellable);
res = class->seek (stream, offset, type, cancellable, error);
if (cancellable)
g_cancellable_pop_current (cancellable);
g_io_stream_clear_pending (io_stream);
return res;
}
static gboolean
g_file_io_stream_seekable_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
return g_file_io_stream_seek (G_FILE_IO_STREAM (seekable),
offset, type, cancellable, error);
}
static gboolean
g_file_io_stream_can_truncate (GFileIOStream *stream)
{
GFileIOStreamClass *class;
gboolean can_truncate;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), FALSE);
class = G_FILE_IO_STREAM_GET_CLASS (stream);
can_truncate = FALSE;
if (class->truncate_fn)
{
can_truncate = TRUE;
if (class->can_truncate)
can_truncate = class->can_truncate (stream);
}
return can_truncate;
}
static gboolean
g_file_io_stream_seekable_can_truncate (GSeekable *seekable)
{
return g_file_io_stream_can_truncate (G_FILE_IO_STREAM (seekable));
}
static gboolean
g_file_io_stream_truncate (GFileIOStream *stream,
goffset size,
GCancellable *cancellable,
GError **error)
{
GFileIOStreamClass *class;
GIOStream *io_stream;
gboolean res;
g_return_val_if_fail (G_IS_FILE_IO_STREAM (stream), FALSE);
io_stream = G_IO_STREAM (stream);
class = G_FILE_IO_STREAM_GET_CLASS (stream);
if (!class->truncate_fn)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Truncate not supported on stream"));
return FALSE;
}
if (!g_io_stream_set_pending (io_stream, error))
return FALSE;
if (cancellable)
g_cancellable_push_current (cancellable);
res = class->truncate_fn (stream, size, cancellable, error);
if (cancellable)
g_cancellable_pop_current (cancellable);
g_io_stream_clear_pending (io_stream);
return res;
}
static gboolean
g_file_io_stream_seekable_truncate (GSeekable *seekable,
goffset size,
GCancellable *cancellable,
GError **error)
{
return g_file_io_stream_truncate (G_FILE_IO_STREAM (seekable),
size, cancellable, error);
}
/*****************************************************
* Default implementations based on output stream *
*****************************************************/
static goffset
g_file_io_stream_real_tell (GFileIOStream *stream)
{
GOutputStream *out;
GSeekable *seekable;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
seekable = G_SEEKABLE (out);
return g_seekable_tell (seekable);
}
static gboolean
g_file_io_stream_real_can_seek (GFileIOStream *stream)
{
GOutputStream *out;
GSeekable *seekable;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
seekable = G_SEEKABLE (out);
return g_seekable_can_seek (seekable);
}
static gboolean
g_file_io_stream_real_seek (GFileIOStream *stream,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GOutputStream *out;
GSeekable *seekable;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
seekable = G_SEEKABLE (out);
return g_seekable_seek (seekable, offset, type, cancellable, error);
}
static gboolean
g_file_io_stream_real_can_truncate (GFileIOStream *stream)
{
GOutputStream *out;
GSeekable *seekable;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
seekable = G_SEEKABLE (out);
return g_seekable_can_truncate (seekable);
}
static gboolean
g_file_io_stream_real_truncate_fn (GFileIOStream *stream,
goffset size,
GCancellable *cancellable,
GError **error)
{
GOutputStream *out;
GSeekable *seekable;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
seekable = G_SEEKABLE (out);
return g_seekable_truncate (seekable, size, cancellable, error);
}
static char *
g_file_io_stream_real_get_etag (GFileIOStream *stream)
{
GOutputStream *out;
GFileOutputStream *file_out;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
file_out = G_FILE_OUTPUT_STREAM (out);
return g_file_output_stream_get_etag (file_out);
}
static GFileInfo *
g_file_io_stream_real_query_info (GFileIOStream *stream,
const char *attributes,
GCancellable *cancellable,
GError **error)
{
GOutputStream *out;
GFileOutputStream *file_out;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
file_out = G_FILE_OUTPUT_STREAM (out);
return g_file_output_stream_query_info (file_out,
attributes, cancellable, error);
}
typedef struct {
GObject *object;
GAsyncReadyCallback callback;
gpointer user_data;
} AsyncOpWrapper;
static AsyncOpWrapper *
async_op_wrapper_new (gpointer object,
GAsyncReadyCallback callback,
gpointer user_data)
{
AsyncOpWrapper *data;
data = g_new0 (AsyncOpWrapper, 1);
data->object = g_object_ref (object);
data->callback = callback;
data->user_data = user_data;
}
static void
async_op_wrapper_callback (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
AsyncOpWrapper *data = user_data;
data->callback (data->object, res, data->user_data);
g_object_unref (data->object);
g_free (data);
}
static void
g_file_io_stream_real_query_info_async (GFileIOStream *stream,
const char *attributes,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GOutputStream *out;
GFileOutputStream *file_out;
AsyncOpWrapper *data;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
file_out = G_FILE_OUTPUT_STREAM (out);
data = async_op_wrapper_new (stream, callback, user_data);
g_file_output_stream_query_info_async (file_out,
attributes, io_priority,
cancellable, async_op_wrapper_callback, data);
}
static GFileInfo *
g_file_io_stream_real_query_info_finish (GFileIOStream *stream,
GAsyncResult *res,
GError **error)
{
GOutputStream *out;
GFileOutputStream *file_out;
out = g_io_stream_get_output_stream (G_IO_STREAM (stream));
file_out = G_FILE_OUTPUT_STREAM (out);
return g_file_output_stream_query_info_finish (file_out, res, error);
}
static void
g_file_io_stream_class_init (GFileIOStreamClass *klass)
{
g_type_class_add_private (klass, sizeof (GFileIOStreamPrivate));
klass->tell = g_file_io_stream_real_tell;
klass->can_seek = g_file_io_stream_real_can_seek;
klass->seek = g_file_io_stream_real_seek;
klass->can_truncate = g_file_io_stream_real_can_truncate;
klass->truncate_fn = g_file_io_stream_real_truncate_fn;
klass->query_info = g_file_io_stream_real_query_info;
klass->query_info_async = g_file_io_stream_real_query_info_async;
klass->query_info_finish = g_file_io_stream_real_query_info_finish;
klass->get_etag = g_file_io_stream_real_get_etag;
}
#define __G_FILE_IO_STREAM_C__
#include "gioaliasdef.c"
/* GIO - GLib Input, Io and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* 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 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., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
#error "Only <gio/gio.h> can be included directly."
#endif
#ifndef __G_FILE_IO_STREAM_H__
#define __G_FILE_IO_STREAM_H__
#include <gio/giostream.h>
G_BEGIN_DECLS
#define G_TYPE_FILE_IO_STREAM (g_file_io_stream_get_type ())
#define G_FILE_IO_STREAM(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_FILE_IO_STREAM, GFileIOStream))
#define G_FILE_IO_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_FILE_IO_STREAM, GFileIOStreamClass))
#define G_IS_FILE_IO_STREAM(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_FILE_IO_STREAM))
#define G_IS_FILE_IO_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_FILE_IO_STREAM))
#define G_FILE_IO_STREAM_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_FILE_IO_STREAM, GFileIOStreamClass))
/**
* GFileIOStream:
*
* A subclass of GIOStream for opened files. This adds
* a few file-specific operations and seeking and truncating.
*
* #GFileIOStream implements GSeekable.
**/
typedef struct _GFileIOStreamClass GFileIOStreamClass;
typedef struct _GFileIOStreamPrivate GFileIOStreamPrivate;
struct _GFileIOStream
{
GIOStream parent_instance;
/*< private >*/
GFileIOStreamPrivate *priv;
};
struct _GFileIOStreamClass
{
GIOStreamClass parent_class;
goffset (* tell) (GFileIOStream *stream);
gboolean (* can_seek) (GFileIOStream *stream);
gboolean (* seek) (GFileIOStream *stream,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error);
gboolean (* can_truncate) (GFileIOStream *stream);
gboolean (* truncate_fn) (GFileIOStream *stream,