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glib/gio/glocalfileinputstream.c
Alexander Larsson 14d58d51a3 Local file implementation of GFileIOStream and ops 
This implements all the GIOStream file ops for local files.
We use the "fallback to output stream" for all GFileIOStream ops.
Some helpers stuff was added to the local input and output streams
so they could be reused.
2009-05-13 14:42:57 +02:00

349 lines
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/* GIO - GLib Input, Output 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "gcancellable.h"
#include "gioerror.h"
#include "glocalfileinputstream.h"
#include "glocalfileinfo.h"
#include "glibintl.h"
#ifdef G_OS_WIN32
#include <io.h>
#endif
#include "gioalias.h"
#define g_local_file_input_stream_get_type _g_local_file_input_stream_get_type
G_DEFINE_TYPE (GLocalFileInputStream, g_local_file_input_stream, G_TYPE_FILE_INPUT_STREAM);
struct _GLocalFileInputStreamPrivate {
int fd;
guint do_close : 1;
};
static gssize g_local_file_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error);
static gssize g_local_file_input_stream_skip (GInputStream *stream,
gsize count,
GCancellable *cancellable,
GError **error);
static gboolean g_local_file_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error);
static goffset g_local_file_input_stream_tell (GFileInputStream *stream);
static gboolean g_local_file_input_stream_can_seek (GFileInputStream *stream);
static gboolean g_local_file_input_stream_seek (GFileInputStream *stream,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error);
static GFileInfo *g_local_file_input_stream_query_info (GFileInputStream *stream,
const char *attributes,
GCancellable *cancellable,
GError **error);
static void
g_local_file_input_stream_finalize (GObject *object)
{
GLocalFileInputStream *file;
file = G_LOCAL_FILE_INPUT_STREAM (object);
G_OBJECT_CLASS (g_local_file_input_stream_parent_class)->finalize (object);
}
void
_g_local_file_input_stream_set_do_close (GLocalFileInputStream *in,
gboolean do_close)
{
in->priv->do_close = do_close;
}
static void
g_local_file_input_stream_class_init (GLocalFileInputStreamClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
GFileInputStreamClass *file_stream_class = G_FILE_INPUT_STREAM_CLASS (klass);
g_type_class_add_private (klass, sizeof (GLocalFileInputStreamPrivate));
gobject_class->finalize = g_local_file_input_stream_finalize;
stream_class->read_fn = g_local_file_input_stream_read;
stream_class->skip = g_local_file_input_stream_skip;
stream_class->close_fn = g_local_file_input_stream_close;
file_stream_class->tell = g_local_file_input_stream_tell;
file_stream_class->can_seek = g_local_file_input_stream_can_seek;
file_stream_class->seek = g_local_file_input_stream_seek;
file_stream_class->query_info = g_local_file_input_stream_query_info;
}
static void
g_local_file_input_stream_init (GLocalFileInputStream *info)
{
info->priv = G_TYPE_INSTANCE_GET_PRIVATE (info,
G_TYPE_LOCAL_FILE_INPUT_STREAM,
GLocalFileInputStreamPrivate);
info->priv->do_close = TRUE;
}
/**
* g_local_file_input_stream_new:
* @fd: File Descriptor.
*
* Returns: #GFileInputStream for the given file descriptor.
**/
GFileInputStream *
_g_local_file_input_stream_new (int fd)
{
GLocalFileInputStream *stream;
stream = g_object_new (G_TYPE_LOCAL_FILE_INPUT_STREAM, NULL);
stream->priv->fd = fd;
return G_FILE_INPUT_STREAM (stream);
}
static gssize
g_local_file_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
{
GLocalFileInputStream *file;
gssize res;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
res = -1;
while (1)
{
if (g_cancellable_set_error_if_cancelled (cancellable, error))
break;
res = read (file->priv->fd, buffer, count);
if (res == -1)
{
int errsv = errno;
if (errsv == EINTR)
continue;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error reading from file: %s"),
g_strerror (errsv));
}
break;
}
return res;
}
static gssize
g_local_file_input_stream_skip (GInputStream *stream,
gsize count,
GCancellable *cancellable,
GError **error)
{
off_t res, start;
GLocalFileInputStream *file;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return -1;
start = lseek (file->priv->fd, 0, SEEK_CUR);
if (start == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error seeking in file: %s"),
g_strerror (errsv));
return -1;
}
res = lseek (file->priv->fd, count, SEEK_CUR);
if (res == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error seeking in file: %s"),
g_strerror (errsv));
return -1;
}
return res - start;
}
static gboolean
g_local_file_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
GLocalFileInputStream *file;
int res;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
if (!file->priv->do_close)
return TRUE;
if (file->priv->fd == -1)
return TRUE;
while (1)
{
res = close (file->priv->fd);
if (res == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error closing file: %s"),
g_strerror (errsv));
}
break;
}
return res != -1;
}
static goffset
g_local_file_input_stream_tell (GFileInputStream *stream)
{
GLocalFileInputStream *file;
off_t pos;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
pos = lseek (file->priv->fd, 0, SEEK_CUR);
if (pos == (off_t)-1)
return 0;
return pos;
}
static gboolean
g_local_file_input_stream_can_seek (GFileInputStream *stream)
{
GLocalFileInputStream *file;
off_t pos;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
pos = lseek (file->priv->fd, 0, SEEK_CUR);
if (pos == (off_t)-1 && errno == ESPIPE)
return FALSE;
return TRUE;
}
static int
seek_type_to_lseek (GSeekType type)
{
switch (type)
{
default:
case G_SEEK_CUR:
return SEEK_CUR;
case G_SEEK_SET:
return SEEK_SET;
case G_SEEK_END:
return SEEK_END;
}
}
static gboolean
g_local_file_input_stream_seek (GFileInputStream *stream,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GLocalFileInputStream *file;
off_t pos;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
pos = lseek (file->priv->fd, offset, seek_type_to_lseek (type));
if (pos == (off_t)-1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error seeking in file: %s"),
g_strerror (errsv));
return FALSE;
}
return TRUE;
}
static GFileInfo *
g_local_file_input_stream_query_info (GFileInputStream *stream,
const char *attributes,
GCancellable *cancellable,
GError **error)
{
GLocalFileInputStream *file;
file = G_LOCAL_FILE_INPUT_STREAM (stream);
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return NULL;
return _g_local_file_info_get_from_fd (file->priv->fd,
attributes,
error);
}
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