/* 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;
};
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);
}
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);
}
/**
* 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->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);
}