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Make GDataOutputStream implement GSeekable

Browse Source 
https://bugzilla.gnome.org/show_bug.cgi?id=673034
This commit is contained in:
Maciej Piechotka
2012-03-29 02:08:41 +02:00
committed by Alexander Larsson
parent 43895e3089
commit a44e801983
2 changed files with 299 additions and 3 deletions
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108
gio/gdataoutputstream.c
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@@ -23,7 +23,9 @@
#include "config.h"
#include <string.h>
#include "gdataoutputstream.h"
#include "gseekable.h"
#include "gioenumtypes.h"
#include "gioerror.h"
#include "glibintl.h"
@@ -58,9 +60,25 @@ static void g_data_output_stream_get_property (GObject *object,
GValue *value,
GParamSpec *pspec);
G_DEFINE_TYPE (GDataOutputStream,
g_data_output_stream,
G_TYPE_FILTER_OUTPUT_STREAM)
static void g_data_output_stream_seekable_iface_init (GSeekableIface *iface);
static goffset g_data_output_stream_tell (GSeekable *seekable);
static gboolean g_data_output_stream_can_seek (GSeekable *seekable);
static gboolean g_data_output_stream_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error);
static gboolean g_data_output_stream_can_truncate (GSeekable *seekable);
static gboolean g_data_output_stream_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error);
G_DEFINE_TYPE_WITH_CODE (GDataOutputStream,
g_data_output_stream,
G_TYPE_FILTER_OUTPUT_STREAM,
G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
g_data_output_stream_seekable_iface_init))
static void
@@ -147,6 +165,16 @@ g_data_output_stream_init (GDataOutputStream *stream)
stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
}
static void
g_data_output_stream_seekable_iface_init (GSeekableIface *iface)
{
iface->tell = g_data_output_stream_tell;
iface->can_seek = g_data_output_stream_can_seek;
iface->seek = g_data_output_stream_seek;
iface->can_truncate = g_data_output_stream_can_truncate;
iface->truncate_fn = g_data_output_stream_truncate;
}
/**
* g_data_output_stream_new:
* @base_stream: a #GOutputStream.
@@ -500,3 +528,77 @@ g_data_output_stream_put_string (GDataOutputStream *stream,
&bytes_written,
cancellable, error);
}
static goffset
g_data_output_stream_tell (GSeekable *seekable)
{
GOutputStream *base_stream;
GSeekable *base_stream_seekable;
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
if (!G_IS_SEEKABLE (base_stream))
return 0;
base_stream_seekable = G_SEEKABLE (base_stream);
return g_seekable_tell (base_stream_seekable);
}
static gboolean
g_data_output_stream_can_seek (GSeekable *seekable)
{
GOutputStream *base_stream;
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
}
static gboolean
g_data_output_stream_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GOutputStream *base_stream;
GSeekable *base_stream_seekable;
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
if (!G_IS_SEEKABLE (base_stream))
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Seek not supported on base stream"));
return FALSE;
}
base_stream_seekable = G_SEEKABLE (base_stream);
return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
}
static gboolean
g_data_output_stream_can_truncate (GSeekable *seekable)
{
GOutputStream *base_stream;
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
}
static gboolean
g_data_output_stream_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error)
{
GOutputStream *base_stream;
GSeekable *base_stream_seekable;
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
if (!G_IS_SEEKABLE (base_stream))
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Truncate not supported on base stream"));
return FALSE;
}
base_stream_seekable = G_SEEKABLE (base_stream);
return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
}