/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-stream-fs.c : file system based stream */
/* inspired by gnome-stream-fs.c in bonobo by Miguel de Icaza */
/*
*
* Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@inria.fr> .
*
* 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-fs.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "camel-log.h"
static CamelStreamClass *parent_class=NULL;
/* Returns the class for a CamelStreamFS */
#define CS_CLASS(so) CAMEL_STREAM_FS_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 (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy);
static void
camel_stream_fs_class_init (CamelStreamFsClass *camel_stream_fs_class)
{
CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_fs_class);
parent_class = gtk_type_class (gtk_object_get_type ());
/* virtual method definition */
/* virtual method overload */
camel_stream_class->read = _read;
camel_stream_class->write = _write;
camel_stream_class->flush = _flush;
camel_stream_class->available = _available;
camel_stream_class->eos = _eos;
camel_stream_class->close = _close;
camel_stream_class->seek = _seek;
}
GtkType
camel_stream_fs_get_type (void)
{
static GtkType camel_stream_fs_type = 0;
if (!camel_stream_fs_type) {
GtkTypeInfo camel_stream_fs_info =
{
"CamelStreamFs",
sizeof (CamelStreamFs),
sizeof (CamelStreamFsClass),
(GtkClassInitFunc) camel_stream_fs_class_init,
(GtkObjectInitFunc) NULL,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
camel_stream_fs_type = gtk_type_unique (camel_stream_get_type (), &camel_stream_fs_info);
}
return camel_stream_fs_type;
}
CamelStream *
camel_stream_fs_new_with_name (gchar *name, CamelStreamFsMode mode)
{
struct stat s;
int v, fd;
int flags;
CamelStreamFs *stream_fs;
g_assert (name);
CAMEL_LOG_FULL_DEBUG ( "Entering CamelStream::new_with_name, name=\"%s\", mode=%d\n", name, mode);
v = stat (name, &s);
if (mode & CAMEL_STREAM_FS_READ){
if (mode & CAMEL_STREAM_FS_WRITE)
flags = O_RDWR | O_CREAT;
else
flags = O_RDONLY;
} else {
if (mode & CAMEL_STREAM_FS_WRITE)
flags = O_WRONLY | O_CREAT;
else
return NULL;
}
if ( (mode & CAMEL_STREAM_FS_READ) && !(mode & CAMEL_STREAM_FS_WRITE) )
if (v == -1) return NULL;
fd = open (name, flags, 0600);
if (fd==-1) {
CAMEL_LOG_FULL_DEBUG ( "CamelStreamFs::new_with_name can not obtain fd for file \"%s\"\n", name);
CAMEL_LOG_FULL_DEBUG ( " Full error text is : %s\n", strerror(errno));
return NULL;
}
stream_fs = CAMEL_STREAM_FS (camel_stream_fs_new_with_fd (fd));
stream_fs->name = name;
return CAMEL_STREAM (stream_fs);
}
CamelStream *
camel_stream_fs_new_with_fd (int fd)
{
CamelStreamFs *stream_fs;
CAMEL_LOG_FULL_DEBUG ( "Entering CamelStream::new_with_fd fd=%d\n",fd);
stream_fs = gtk_type_new (camel_stream_fs_get_type ());
stream_fs->fd = fd;
return CAMEL_STREAM (stream_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)
{
int v;
do {
v = read ( (CAMEL_STREAM_FS (stream))->fd, buffer, n);
} while (v == -1 && errno == EINTR);
return v;
}
/**
* _write: read bytes to a stream
* @stream: the stream
* @buffer: byte buffer
* @n: number of bytes to write
*
*
*
* Return value: the number of bytes actually written
* in the stream.
**/
static gint
_write (CamelStream *stream, const gchar *buffer, gint n)
{
int v;
g_assert (stream);
g_assert ((CAMEL_STREAM_FS (stream))->fd);
CAMEL_LOG_FULL_DEBUG ( "CamelStreamFs:: entering write. n=%d\n", n);
do {
v = write ( (CAMEL_STREAM_FS (stream))->fd, buffer, n);
} while (v == -1 && errno == EINTR);
#if HARD_LOG_LEVEL >= FULL_DEBUG
if (v==-1) {
perror("");
CAMEL_LOG_FULL_DEBUG ( "CamelStreamFs::write could not write bytes in stream\n");
}
#endif
return v;
}
/**
* _flush: flush pending changes
* @stream: the stream
*
*
**/
static void
_flush (CamelStream *stream)
{
fsync ((CAMEL_STREAM_FS (stream))->fd);
}
/**
* _available: return the number of bytes available for reading
* @stream: the stream
*
* Return the number of bytes available without blocking.
*
* Return value: the number of bytes available
**/
static gint
_available (CamelStream *stream)
{
g_warning ("Not implemented yet");
}
/**
* _eos: test if there are bytes left to read
* @stream: the stream
*
*
*
* Return value: true if all stream has been read
**/
static gboolean
_eos (CamelStream *stream)
{
g_warning ("Not implemented yet");
}
/**
* _close: close a stream
* @stream: the stream
*
*
**/
static void
_close (CamelStream *stream)
{
close ((CAMEL_STREAM_FS (stream))->fd);
}
static gint
_seek (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy)
{
int whence;
switch (policy) {
case CAMEL_STREAM_SET:
whence = SEEK_SET;
break;
case CAMEL_STREAM_CUR:
whence = SEEK_CUR;
break;
case CAMEL_STREAM_END:
whence = SEEK_END;
break;
default:
return -1;
}
return lseek ((CAMEL_STREAM_FS (stream))->fd, offset, whence);
}
