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367 lines
9.0 KiB
C
367 lines
9.0 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <glib.h>
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#include <glib/gstdio.h>
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#include "gcancellable.h"
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#include "gioerror.h"
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#include "glocalfileinputstream.h"
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#include "glocalfileinfo.h"
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#include "glibintl.h"
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#ifdef G_OS_UNIX
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#include <unistd.h>
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#include "glib-unix.h"
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#include "gfiledescriptorbased.h"
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#endif
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#ifdef G_OS_WIN32
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#include <io.h>
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#endif
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struct _GLocalFileInputStreamPrivate {
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int fd;
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guint do_close : 1;
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};
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#ifdef G_OS_UNIX
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static void g_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface);
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#endif
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#define g_local_file_input_stream_get_type _g_local_file_input_stream_get_type
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#ifdef G_OS_UNIX
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G_DEFINE_TYPE_WITH_CODE (GLocalFileInputStream, g_local_file_input_stream, G_TYPE_FILE_INPUT_STREAM,
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G_ADD_PRIVATE (GLocalFileInputStream)
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G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED,
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g_file_descriptor_based_iface_init))
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#else
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G_DEFINE_TYPE_WITH_CODE (GLocalFileInputStream, g_local_file_input_stream, G_TYPE_FILE_INPUT_STREAM,
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G_ADD_PRIVATE (GLocalFileInputStream))
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#endif
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static gssize g_local_file_input_stream_read (GInputStream *stream,
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void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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static gssize g_local_file_input_stream_skip (GInputStream *stream,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_local_file_input_stream_close (GInputStream *stream,
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GCancellable *cancellable,
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GError **error);
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static goffset g_local_file_input_stream_tell (GFileInputStream *stream);
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static gboolean g_local_file_input_stream_can_seek (GFileInputStream *stream);
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static gboolean g_local_file_input_stream_seek (GFileInputStream *stream,
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goffset offset,
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GSeekType type,
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GCancellable *cancellable,
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GError **error);
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static GFileInfo *g_local_file_input_stream_query_info (GFileInputStream *stream,
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const char *attributes,
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GCancellable *cancellable,
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GError **error);
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#ifdef G_OS_UNIX
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static int g_local_file_input_stream_get_fd (GFileDescriptorBased *stream);
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#endif
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void
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_g_local_file_input_stream_set_do_close (GLocalFileInputStream *in,
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gboolean do_close)
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{
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in->priv->do_close = do_close;
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}
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static void
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g_local_file_input_stream_class_init (GLocalFileInputStreamClass *klass)
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{
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GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
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GFileInputStreamClass *file_stream_class = G_FILE_INPUT_STREAM_CLASS (klass);
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stream_class->read_fn = g_local_file_input_stream_read;
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stream_class->skip = g_local_file_input_stream_skip;
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stream_class->close_fn = g_local_file_input_stream_close;
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file_stream_class->tell = g_local_file_input_stream_tell;
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file_stream_class->can_seek = g_local_file_input_stream_can_seek;
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file_stream_class->seek = g_local_file_input_stream_seek;
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file_stream_class->query_info = g_local_file_input_stream_query_info;
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}
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#ifdef G_OS_UNIX
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static void
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g_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface)
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{
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iface->get_fd = g_local_file_input_stream_get_fd;
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}
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#endif
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static void
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g_local_file_input_stream_init (GLocalFileInputStream *info)
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{
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info->priv = g_local_file_input_stream_get_instance_private (info);
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info->priv->do_close = TRUE;
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}
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GFileInputStream *
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_g_local_file_input_stream_new (int fd)
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{
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GLocalFileInputStream *stream;
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stream = g_object_new (G_TYPE_LOCAL_FILE_INPUT_STREAM, NULL);
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stream->priv->fd = fd;
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return G_FILE_INPUT_STREAM (stream);
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}
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static gssize
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g_local_file_input_stream_read (GInputStream *stream,
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void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error)
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{
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GLocalFileInputStream *file;
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gssize res;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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res = -1;
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while (1)
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{
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if (g_cancellable_set_error_if_cancelled (cancellable, error))
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break;
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res = read (file->priv->fd, buffer, count);
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if (res == -1)
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{
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int errsv = errno;
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if (errsv == EINTR)
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continue;
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error reading from file: %s"),
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g_strerror (errsv));
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}
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break;
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}
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return res;
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}
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static gssize
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g_local_file_input_stream_skip (GInputStream *stream,
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gsize count,
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GCancellable *cancellable,
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GError **error)
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{
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off_t start, end;
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GLocalFileInputStream *file;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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if (g_cancellable_set_error_if_cancelled (cancellable, error))
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return -1;
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start = lseek (file->priv->fd, 0, SEEK_CUR);
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if (start == -1)
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{
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int errsv = errno;
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error seeking in file: %s"),
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g_strerror (errsv));
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return -1;
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}
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end = lseek (file->priv->fd, 0, SEEK_END);
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if (end == -1)
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{
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int errsv = errno;
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error seeking in file: %s"),
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g_strerror (errsv));
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return -1;
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}
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if (end - start > count)
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{
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end = lseek (file->priv->fd, count - (end - start), SEEK_CUR);
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if (end == -1)
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{
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int errsv = errno;
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error seeking in file: %s"),
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g_strerror (errsv));
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return -1;
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}
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}
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return end - start;
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}
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static gboolean
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g_local_file_input_stream_close (GInputStream *stream,
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GCancellable *cancellable,
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GError **error)
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{
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GLocalFileInputStream *file;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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if (!file->priv->do_close)
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return TRUE;
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if (file->priv->fd == -1)
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return TRUE;
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if (!g_close (file->priv->fd, NULL))
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{
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int errsv = errno;
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error closing file: %s"),
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g_strerror (errsv));
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return FALSE;
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}
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return TRUE;
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}
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static goffset
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g_local_file_input_stream_tell (GFileInputStream *stream)
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{
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GLocalFileInputStream *file;
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off_t pos;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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pos = lseek (file->priv->fd, 0, SEEK_CUR);
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if (pos == (off_t)-1)
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return 0;
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return pos;
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}
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static gboolean
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g_local_file_input_stream_can_seek (GFileInputStream *stream)
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{
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GLocalFileInputStream *file;
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off_t pos;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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pos = lseek (file->priv->fd, 0, SEEK_CUR);
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if (pos == (off_t)-1 && errno == ESPIPE)
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return FALSE;
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return TRUE;
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}
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static int
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seek_type_to_lseek (GSeekType type)
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{
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switch (type)
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{
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default:
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case G_SEEK_CUR:
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return SEEK_CUR;
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case G_SEEK_SET:
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return SEEK_SET;
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case G_SEEK_END:
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return SEEK_END;
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}
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}
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static gboolean
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g_local_file_input_stream_seek (GFileInputStream *stream,
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goffset offset,
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GSeekType type,
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GCancellable *cancellable,
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GError **error)
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{
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GLocalFileInputStream *file;
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off_t pos;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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pos = lseek (file->priv->fd, offset, seek_type_to_lseek (type));
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if (pos == (off_t)-1)
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{
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int errsv = errno;
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (errsv),
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_("Error seeking in file: %s"),
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g_strerror (errsv));
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return FALSE;
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}
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return TRUE;
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}
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static GFileInfo *
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g_local_file_input_stream_query_info (GFileInputStream *stream,
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const char *attributes,
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GCancellable *cancellable,
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GError **error)
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{
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GLocalFileInputStream *file;
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file = G_LOCAL_FILE_INPUT_STREAM (stream);
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if (g_cancellable_set_error_if_cancelled (cancellable, error))
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return NULL;
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return _g_local_file_info_get_from_fd (file->priv->fd,
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attributes,
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error);
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}
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#ifdef G_OS_UNIX
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static int
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g_local_file_input_stream_get_fd (GFileDescriptorBased *fd_based)
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{
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GLocalFileInputStream *stream = G_LOCAL_FILE_INPUT_STREAM (fd_based);
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return stream->priv->fd;
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}
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#endif
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