/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* camel-simple-data-wrapper-stream.c
*
* 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.
*
* Author: Ettore Perazzoli
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "camel-simple-data-wrapper-stream.h"
static CamelStreamClass *parent_class = NULL;
/* CamelStream methods. */
static gint
read (CamelStream *stream,
gchar *buffer,
gint n)
{
CamelSimpleDataWrapperStream *wrapper_stream;
CamelSimpleDataWrapper *wrapper;
GByteArray *array;
gint len;
wrapper_stream = CAMEL_SIMPLE_DATA_WRAPPER_STREAM (stream);
wrapper = wrapper_stream->wrapper;
g_return_val_if_fail (wrapper != NULL, -1);
array = wrapper->byte_array;
len = MIN (n, array->len - wrapper_stream->current_position);
if (len > 0) {
memcpy (buffer, array->data, len);
wrapper_stream->current_position += len;
return len;
} else {
return 0;
}
}
static gint
write (CamelStream *stream,
const gchar *buffer,
gint n)
{
CamelSimpleDataWrapperStream *wrapper_stream;
CamelSimpleDataWrapper *wrapper;
GByteArray *array;
gint len;
const gchar *buffer_next;
gint left;
wrapper_stream = CAMEL_SIMPLE_DATA_WRAPPER_STREAM (stream);
wrapper = wrapper_stream->wrapper;
g_return_val_if_fail (wrapper != NULL, -1);
array = wrapper->byte_array;
len = MIN (n, array->len - wrapper_stream->current_position);
if (len > 0) {
memcpy (array->data, buffer, len);
buffer_next = buffer + len;
left = n - len;
} else {
/* If we are past the end of the array, fill with zeros. */
if (wrapper_stream->current_position > array->len) {
gint saved_length;
saved_length = array->len;
g_byte_array_set_size
(array, wrapper_stream->current_position);
memset (array->data + saved_length,
0,
(wrapper_stream->current_position
- saved_length));
}
buffer_next = buffer;
left = n;
}
if (n > 0)
g_byte_array_append (array, buffer_next, left);
wrapper_stream->current_position += n;
return n;
}
static void
flush (CamelStream *stream)
{
/* No op, as we don't do any buffering. */
}
static gint
available (CamelStream *stream)
{
CamelSimpleDataWrapperStream *wrapper_stream;
CamelSimpleDataWrapper *wrapper;
GByteArray *array;
gint available;
wrapper_stream = CAMEL_SIMPLE_DATA_WRAPPER_STREAM (stream);
wrapper = wrapper_stream->wrapper;
g_return_val_if_fail (wrapper != NULL, -1);
array = wrapper->byte_array;
available = array->len - wrapper_stream->current_position;
return MAX (available, 0);
}
static gboolean
eos (CamelStream *stream)
{
if (available (stream) > 0)
return TRUE;
else
return FALSE;
}
static void
close (CamelStream *stream)
{
/* Nothing to do, we have no associated file descriptor. */
}
static gint
seek (CamelSeekableStream *stream,
gint offset,
CamelStreamSeekPolicy policy)
{
CamelSimpleDataWrapperStream *wrapper_stream;
gint new_position;
wrapper_stream = CAMEL_SIMPLE_DATA_WRAPPER_STREAM (stream);
switch (policy) {
case CAMEL_STREAM_SET:
new_position = offset;
break;
case CAMEL_STREAM_CUR:
new_position = wrapper_stream->current_position + offset;
break;
case CAMEL_STREAM_END:
new_position = wrapper_stream->wrapper->byte_array->len;
break;
default:
g_warning ("Unknown CamelStreamSeekPolicy %d.", policy);
return -1;
}
wrapper_stream->current_position = new_position;
return new_position;
}
/* This handles destruction of the associated CamelDataWrapper. */
/* Hm, this should never happen though, because we gtk_object_ref() the
wrapper. */
static void
wrapper_destroy_cb (GtkObject *object,
gpointer data)
{
CamelSimpleDataWrapperStream *stream;
g_warning ("CamelSimpleDataWrapperStream: associated CamelSimpleDataWrapper was destroyed.");
stream = CAMEL_SIMPLE_DATA_WRAPPER_STREAM (object);
stream->wrapper = NULL;
}
/* GtkObject methods. */
static void
destroy (GtkObject *object)
{
CamelSimpleDataWrapperStream *stream;
stream = CAMEL_SIMPLE_DATA_WRAPPER_STREAM (object);
gtk_object_unref (GTK_OBJECT (stream->wrapper));
if (GTK_OBJECT_CLASS (parent_class)->destroy != NULL)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
static void
class_init (CamelSimpleDataWrapperStreamClass *klass)
{
GtkObjectClass *object_class;
object_class = (GtkObjectClass*) klass;
parent_class = gtk_type_class (camel_stream_get_type ());
}
static void
init (CamelSimpleDataWrapperStream *simple_data_wrapper_stream)
{
simple_data_wrapper_stream->current_position = 0;
}
GtkType
camel_simple_data_wrapper_stream_get_type (void)
{
static GtkType type = 0;
if (type == 0) {
static const GtkTypeInfo info = {
"CamelSimpleDataWrapperStream",
sizeof (CamelSimpleDataWrapperStream),
sizeof (CamelSimpleDataWrapperStreamClass),
(GtkClassInitFunc) class_init,
(GtkObjectInitFunc) init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
type = gtk_type_unique (camel_stream_get_type (), &info);
}
return type;
}
void
camel_simple_data_wrapper_stream_construct (CamelSimpleDataWrapperStream *stream,
CamelSimpleDataWrapper *wrapper)
{
g_return_if_fail (stream != NULL);
g_return_if_fail (CAMEL_IS_SIMPLE_DATA_WRAPPER_STREAM (stream));
g_return_if_fail (wrapper != NULL);
g_return_if_fail (CAMEL_IS_SIMPLE_DATA_WRAPPER (wrapper));
gtk_object_ref (GTK_OBJECT (wrapper));
stream->wrapper = wrapper;
gtk_signal_connect (GTK_OBJECT (wrapper), "destroy",
wrapper_destroy_cb, stream);
}
CamelStream *
camel_simple_data_wrapper_stream_new (CamelSimpleDataWrapper *wrapper)
{
CamelStream *stream;
g_return_val_if_fail (wrapper != NULL, NULL);
g_return_val_if_fail (CAMEL_IS_SIMPLE_DATA_WRAPPER (wrapper), NULL);
stream = gtk_type_new (camel_simple_data_wrapper_stream_get_type ());
camel_simple_data_wrapper_stream_construct
(CAMEL_SIMPLE_DATA_WRAPPER_STREAM (stream), wrapper);
return stream;
}
