/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-stream-buffered-fs.c : file system based stream with buffer*/
/*
*
* Author :
* Bertrand Guiheneuf <bertrand@helixcode.com>
*
* Copyright 1999, 2000 HelixCode (http://www.helixcode.com) .
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <config.h>
#include "camel-stream-buffered-fs.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "camel-log.h"
static CamelStreamFsClass *parent_class=NULL;
/* Returns the class for a CamelStreamBufferedFs */
#define CSBFS_CLASS(so) CAMEL_STREAM_BUFFERED_FS_CLASS (GTK_OBJECT(so)->klass)
#define CSFS_CLASS(so) CAMEL_STREAM_FS_CLASS (GTK_OBJECT(so)->klass)
#define CS_CLASS(so) CAMEL_STREAM_CLASS (GTK_OBJECT(so)->klass)
static gint _read (CamelStream *stream, gchar *buffer, gint n);
static gint _write (CamelStream *stream, const gchar *buffer, gint n);
static void _flush (CamelStream *stream);
static gint _available (CamelStream *stream);
static gboolean _eos (CamelStream *stream);
static void _close (CamelStream *stream);
static gint _seek (CamelSeekableStream *stream, gint offset, CamelStreamSeekPolicy policy);
static void _finalize (GtkObject *object);
static void _destroy (GtkObject *object);
static void
camel_stream_buffered_fs_class_init (CamelStreamBufferedFsClass *camel_stream_buffered_fs_class)
{
CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_buffered_fs_class);
GtkObjectClass *gtk_object_class = GTK_OBJECT_CLASS (camel_stream_buffered_fs_class);
parent_class = gtk_type_class (camel_stream_fs_get_type ());
/* virtual method definition */
/* virtual method overload */
camel_stream_class->read = _read;
gtk_object_class->finalize = _finalize;
gtk_object_class->destroy = _destroy;
}
static void
camel_stream_buffered_fs_init (gpointer object, gpointer klass)
{
CamelStreamBufferedFs *stream = CAMEL_STREAM_BUFFERED_FS (object);
stream->buffer_size = 200;
stream->read_buffer = g_new (gchar, stream->buffer_size);
stream->write_buffer = g_new (gchar, stream->buffer_size);
stream->read_pos = 0;
stream->read_pos_max = 0;
stream->write_pos = 0;
stream->write_pos_max = stream->buffer_size;
}
GtkType
camel_stream_buffered_fs_get_type (void)
{
static GtkType camel_stream_buffered_fs_type = 0;
gdk_threads_enter ();
if (!camel_stream_buffered_fs_type) {
GtkTypeInfo camel_stream_buffered_fs_info =
{
"CamelStreamBufferedFs",
sizeof (CamelStreamBufferedFs),
sizeof (CamelStreamBufferedFsClass),
(GtkClassInitFunc) camel_stream_buffered_fs_class_init,
(GtkObjectInitFunc) camel_stream_buffered_fs_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
camel_stream_buffered_fs_type = gtk_type_unique (camel_stream_fs_get_type (), &camel_stream_buffered_fs_info);
}
gdk_threads_leave ();
return camel_stream_buffered_fs_type;
}
static void
_destroy (GtkObject *object)
{
CamelStreamBufferedFs *stream_buffered_fs = CAMEL_STREAM_BUFFERED_FS (object);
CAMEL_LOG_FULL_DEBUG ("Entering CamelStreamBufferedFs::destroy\n");
GTK_OBJECT_CLASS (parent_class)->destroy (object);
CAMEL_LOG_FULL_DEBUG ("Leaving CamelStreamBufferedFs::destroy\n");
}
static void
_finalize (GtkObject *object)
{
CamelStreamBufferedFs *stream_buffered_fs = CAMEL_STREAM_BUFFERED_FS (object);
CAMEL_LOG_FULL_DEBUG ("Entering CamelStreamBufferedFs::finalize\n");
g_free (stream_buffered_fs->read_buffer);
g_free (stream_buffered_fs->write_buffer);
GTK_OBJECT_CLASS (parent_class)->finalize (object);
CAMEL_LOG_FULL_DEBUG ("Leaving CamelStreamBufferedFs::finalize\n");
}
CamelStream *
camel_stream_buffered_fs_new_with_name (const gchar *name, CamelStreamFsMode mode)
{
CamelStreamFs *stream_buffered_fs;
stream_buffered_fs = gtk_type_new (camel_stream_buffered_fs_get_type ());
CSFS_CLASS (stream_buffered_fs)->init_with_name (stream_buffered_fs, name, mode);
return CAMEL_STREAM (stream_buffered_fs);
}
CamelStream *
camel_stream_buffered_fs_new_with_fd (int fd)
{
CamelStreamFs *stream_buffered_fs;
CAMEL_LOG_FULL_DEBUG ( "Entering CamelStream::new_with_fd fd=%d\n",fd);
stream_buffered_fs = gtk_type_new (camel_stream_buffered_fs_get_type ());
CSFS_CLASS (stream_buffered_fs)->init_with_fd (stream_buffered_fs, fd);
return CAMEL_STREAM (stream_buffered_fs);
}
/**
* _read: read bytes from a stream
* @stream: stream
* @buffer: buffer where bytes are stored
* @n: max number of bytes to read
*
*
*
* Return value: number of bytes actually read.
**/
static gint
_read (CamelStream *stream, gchar *buffer, gint n)
{
CamelStreamBufferedFs *sbf = CAMEL_STREAM_BUFFERED_FS (stream);
gint v;
gint nb_bytes_buffered;
gint nb_bytes_to_read = n;
gint nb_bytes_read = 0;
gint bytes_chunk;
gboolean eof = FALSE;
g_return_val_if_fail (n>0, n);
nb_bytes_buffered = sbf->read_pos_max - sbf->read_pos;
while ( (!eof) && (nb_bytes_to_read>0)) {
if (nb_bytes_buffered <= 0) {
/* have to read some data on disk */
v = CAMEL_STREAM_CLASS (parent_class)->read (stream, sbf->read_buffer, sbf->buffer_size);
nb_bytes_buffered = v;
sbf->read_pos_max = v;
sbf->read_pos = 0;
}
/* nb of bytes to put inside buffer */
bytes_chunk = MIN (nb_bytes_buffered, nb_bytes_to_read);
if (bytes_chunk > 0) {
/* copy some bytes from the cache */
memcpy (buffer, sbf->read_buffer + sbf->read_pos, bytes_chunk);
nb_bytes_buffered -= bytes_chunk;
nb_bytes_to_read -= bytes_chunk;
nb_bytes_read += bytes_chunk;
sbf->read_pos += bytes_chunk;
} else /* nb_bytes_to_read is >0 so if bytes_chunk is <0
* there was no data available */
eof = TRUE;
}
return nb_bytes_read;
}
static gint
_write (CamelStream *stream, const gchar *buffer, gint n)
{
return 0;
}
static void
_flush (CamelStream *stream)
{
}
static gint
_available (CamelStream *stream)
{
return 0;
}
static gboolean
_eos (CamelStream *stream)
{
return FALSE;
}
static void
_close (CamelStream *stream)
{
}
static gint
_seek (CamelSeekableStream *stream, gint offset, CamelStreamSeekPolicy policy)
{
return 0;
}
