camel/camel-seekable-stream.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2
   3 /*
   4  *
   5  * Author :
   6  *  Bertrand Guiheneuf <bertrand@helixcode.com>
   7  *
   8  * Copyright 1999, 2000 HelixCode (http://www.helixcode.com) .
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  23  * USA
  24  */
  25
  26
  27
  28 #include <config.h>
  29 #include "camel-seekable-stream.h"
  30 #include "camel-log.h"
  31
  32 static CamelStreamClass *parent_class=NULL;
  33
  34
  35 /* Returns the class for a CamelSeekableStream */
  36 #define CSS_CLASS(so) CAMEL_SEEKABLE_STREAM_CLASS (GTK_OBJECT(so)->klass)
  37
  38 static gint _seek (CamelSeekableStream *stream, gint offset, CamelStreamSeekPolicy policy);
  39
  40
  41 static void
  42 camel_seekable_stream_class_init (CamelSeekableStreamClass *camel_seekable_stream_class)
  43 {
  44         CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_seekable_stream_class);
  45         GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_seekable_stream_class);
  46
  47         parent_class = gtk_type_class (camel_stream_get_type ());
  48
  49         camel_seekable_stream_class->seek = _seek;
  50
  51 }
  52
  53 GtkType
  54 camel_seekable_stream_get_type (void)
  55 {
  56         static GtkType camel_seekable_stream_type = 0;
  57
  58         if (!camel_seekable_stream_type)        {
  59                 GtkTypeInfo camel_seekable_stream_info =
  60                 {
  61                         "CamelSeekableStream",
  62                         sizeof (CamelSeekableStream),
  63                         sizeof (CamelSeekableStreamClass),
  64                         (GtkClassInitFunc) camel_seekable_stream_class_init,
  65                         (GtkObjectInitFunc) NULL,
  66                                 /* reserved_1 */ NULL,
  67                                 /* reserved_2 */ NULL,
  68                         (GtkClassInitFunc) NULL,
  69                 };
  70
  71                 camel_seekable_stream_type = gtk_type_unique (camel_stream_get_type (), &camel_seekable_stream_info);
  72         }
  73
  74         return camel_seekable_stream_type;
  75 }
  76
  77
  78
  79
  80 static gint
  81 _seek (CamelSeekableStream *stream,
  82        gint offset,
  83        CamelStreamSeekPolicy policy)
  84 {
  85         return -1;
  86 }
  87
  88
  89
  90 /**
  91  * camel_stream_seek:
  92  * @stream: a CamelStream object.
  93  * @offset: offset value
  94  * @policy: what to do with the offset
  95  *
  96  *
  97  *
  98  * Return value: new position, -1 if operation failed.
  99  **/
 100 gint
 101 camel_seekable_stream_seek (CamelSeekableStream *stream,
 102                             gint offset,
 103                             CamelStreamSeekPolicy policy)
 104 {
 105         return CSS_CLASS (stream)->seek (stream, offset, policy);
 106 }
 107
 108
 109
 110
 111 /**
 112  * camel_seekable_stream_get_current_position: get the position of a stream
 113  * @stream: seekable stream object
 114  *
 115  * Get the current position of a seekable stream.
 116  *
 117  * Return value: the position.
 118  **/
 119 guint32
 120 camel_seekable_stream_get_current_position  (CamelSeekableStream *stream)
 121 {
 122         return stream->cur_pos;
 123 }
 124
 125
 126
 127
 128
 129
 130
 131
 132