/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-ofmemet: 8 -*- */
/* camel-stream-mem.c : memory buffer based stream */
/* inspired by gnome-stream-mem.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-mem.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 CamelStreamMEM */
#define CS_CLASS(so) CAMEL_STREAM_MEM_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_mem_class_init (CamelStreamMemClass *camel_stream_mem_class)
{
CamelStreamClass *camel_stream_class = CAMEL_STREAM_CLASS (camel_stream_mem_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;
}
static void
camel_stream_mem_init (gpointer object, gpointer klass)
{
CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (object);
camel_stream_mem->buffer = g_byte_array_new ();
camel_stream_mem->position = 0;
}
GtkType
camel_stream_mem_get_type (void)
{
static GtkType camel_stream_mem_type = 0;
if (!camel_stream_mem_type) {
GtkTypeInfo camel_stream_mem_info =
{
"CamelStreamMem",
sizeof (CamelStreamMem),
sizeof (CamelStreamMemClass),
(GtkClassInitFunc) camel_stream_mem_class_init,
(GtkObjectInitFunc) camel_stream_mem_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
camel_stream_mem_type = gtk_type_unique (camel_stream_get_type (), &camel_stream_mem_info);
}
return camel_stream_mem_type;
}
CamelStream *
camel_stream_mem_new (CamelStreamMemMode mode)
{
CamelStreamMem *stream_mem;
stream_mem = gtk_type_new (camel_stream_mem_get_type ());
stream_mem->mode = mode;
return CAMEL_STREAM (stream_mem);
}
/**
* _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)
{
CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream);
gint nb_bytes_to_read;
g_assert (stream);
nb_bytes_to_read = MIN (n, (camel_stream_mem->buffer)->len - camel_stream_mem->position);
if (nb_bytes_to_read>0) {
memcpy (buffer, (camel_stream_mem->buffer)->data + camel_stream_mem->position, nb_bytes_to_read);
camel_stream_mem->position += nb_bytes_to_read;
} else nb_bytes_to_read = -1;
return nb_bytes_to_read;
}
/**
* _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)
{
CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream);
g_assert (stream);
g_return_val_if_fail (camel_stream_mem->position>=0, -1);
camel_stream_mem->buffer = g_byte_array_append (camel_stream_mem->buffer, (const guint8 *)buffer, n);
camel_stream_mem->position += n;
}
/**
* _flush: flush pending changes
* @stream: the stream
*
*
**/
static void
_flush (CamelStream *stream)
{
g_warning ("Not implemented yet");
}
/**
* _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)
{
g_warning ("Not implemented yet");
}
static gint
_seek (CamelStream *stream, gint offset, CamelStreamSeekPolicy policy)
{
gint position;
CamelStreamMem *camel_stream_mem = CAMEL_STREAM_MEM (stream);
switch (policy) {
case CAMEL_STREAM_SET:
position = offset;
break;
case CAMEL_STREAM_CUR:
position = camel_stream_mem->position + offset;
break;
case CAMEL_STREAM_END:
position = (camel_stream_mem->buffer)->len + offset;
break;
default:
return -1;
}
position = MIN (position, (camel_stream_mem->buffer)->len);
position = MAX (position, 0);
camel_stream_mem->position = position;
return position;
}
