/* 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 */ #include #include #include #include #include #include #include #include #include "gioerror.h" #include "glocalfileinputstream.h" #include "glocalfileinfo.h" #include "glibintl.h" #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, 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); if (G_OBJECT_CLASS (g_local_file_input_stream_parent_class)->finalize) (*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 = g_local_file_input_stream_read; stream_class->skip = g_local_file_input_stream_skip; stream_class->close = 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) { if (errno == EINTR) continue; g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), _("Error reading from file: %s"), g_strerror (errno)); } 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) { g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), _("Error seeking in file: %s"), g_strerror (errno)); return -1; } res = lseek (file->priv->fd, count, SEEK_CUR); if (res == -1) { g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), _("Error seeking in file: %s"), g_strerror (errno)); 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) { g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), _("Error closing file: %s"), g_strerror (errno)); } 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) { g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno), _("Error seeking in file: %s"), g_strerror (errno)); return FALSE; } return TRUE; } static GFileInfo * g_local_file_input_stream_query_info (GFileInputStream *stream, 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); }