/*
* Copyright (C) 2000 Helix Code Inc.
*
* Authors: Michael Zucchi <notzed@helixcode.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "camel-stream-filter.h"
struct _filter {
struct _filter *next;
int id;
CamelMimeFilter *filter;
};
struct _CamelStreamFilterPrivate {
struct _filter *filters;
int filterid; /* next filter id */
char *realbuffer; /* buffer - READ_PAD */
char *buffer; /* READ_SIZE bytes */
char *filtered; /* the filtered data */
size_t filteredlen;
};
#define READ_PAD (64) /* bytes padded before buffer */
#define READ_SIZE (4096)
#define _PRIVATE(o) (((CamelStreamFilter *)(o))->priv)
static void camel_stream_filter_class_init (CamelStreamFilterClass *klass);
static void camel_stream_filter_init (CamelStreamFilter *obj);
static gint do_read (CamelStream *stream, gchar *buffer, gint n);
static gint do_write (CamelStream *stream, const gchar *buffer, gint n);
static void do_flush (CamelStream *stream);
static gboolean do_eos (CamelStream *stream);
static void do_close (CamelStream *stream);
static void do_reset (CamelStream *stream);
static CamelStreamClass *camel_stream_filter_parent;
enum SIGNALS {
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
guint
camel_stream_filter_get_type (void)
{
static guint type = 0;
if (!type) {
GtkTypeInfo type_info = {
"CamelStreamFilter",
sizeof (CamelStreamFilter),
sizeof (CamelStreamFilterClass),
(GtkClassInitFunc) camel_stream_filter_class_init,
(GtkObjectInitFunc) camel_stream_filter_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL
};
type = gtk_type_unique (camel_stream_get_type (), &type_info);
}
return type;
}
static void
finalise(GtkObject *o)
{
CamelStreamFilter *filter = (CamelStreamFilter *)o;
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
struct _filter *fn, *f;
f = p->filters;
while (f) {
fn = f->next;
gtk_object_unref((GtkObject *)f->filter);
g_free(f);
f = fn;
}
g_free(p->realbuffer);
g_free(p);
gtk_object_unref((GtkObject *)filter->source);
GTK_OBJECT_CLASS (camel_stream_filter_parent)->finalize (o);
}
static void
camel_stream_filter_class_init (CamelStreamFilterClass *klass)
{
GtkObjectClass *object_class = (GtkObjectClass *) klass;
CamelStreamClass *camel_stream_class = (CamelStreamClass *) klass;
camel_stream_filter_parent = gtk_type_class (camel_stream_get_type ());
object_class->finalize = finalise;
camel_stream_class->read = do_read;
camel_stream_class->write = do_write;
camel_stream_class->flush = do_flush;
camel_stream_class->eos = do_eos;
camel_stream_class->close = do_close;
camel_stream_class->reset = do_reset;
gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);
}
static void
camel_stream_filter_init (CamelStreamFilter *obj)
{
struct _CamelStreamFilterPrivate *p;
_PRIVATE(obj) = p = g_malloc0(sizeof(*p));
p->realbuffer = g_malloc(READ_SIZE + READ_PAD);
p->buffer = p->realbuffer + READ_PAD;
}
/**
* camel_stream_filter_new:
*
* Create a new CamelStreamFilter object.
*
* Return value: A new CamelStreamFilter object.
**/
CamelStreamFilter *
camel_stream_filter_new_with_stream(CamelStream *stream)
{
CamelStreamFilter *new = CAMEL_STREAM_FILTER ( gtk_type_new (camel_stream_filter_get_type ()));
new->source = stream;
return new;
}
/**
* camel_stream_filter_add:
* @filter: Initialised CamelStreamFilter.
* @mf: Filter to perform processing on stream.
*
* Add a new CamelMimeFilter to execute during the processing of this
* stream. Each filter added is processed after the previous one.
*
* Note that a filter should only be added to a single stream
* at a time, otherwise unpredictable results may occur.
*
* Return value: A filter id for this CamelStreamFilter.
**/
int
camel_stream_filter_add(CamelStreamFilter *filter, CamelMimeFilter *mf)
{
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
struct _filter *fn, *f;
fn = g_malloc(sizeof(*fn));
fn->id = p->filterid++;
fn->filter = mf;
gtk_object_ref((GtkObject *)mf);
/* sure, we could use a GList, but we wouldn't save much */
f = (struct _filter *)&p->filters;
while (f->next)
f = f->next;
f->next = fn;
fn->next = NULL;
return fn->id;
}
/**
* camel_stream_filter_remove:
* @filter: Initialised CamelStreamFilter.
* @id: Filter id, as returned from camel_stream_filter_add().
*
* Remove a processing filter from the stream, by id.
**/
void
camel_stream_filter_remove(CamelStreamFilter *filter, int id)
{
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
struct _filter *fn, *f;
f = (struct _filter *)&p->filters;
while (f && f->next) {
fn = f->next;
if (fn->id == id) {
f->next = fn->next;
gtk_object_unref((GtkObject *)fn->filter);
g_free(fn);
}
f = f->next;
}
}
static gint do_read (CamelStream *stream, gchar *buffer, gint n)
{
CamelStreamFilter *filter = (CamelStreamFilter *)stream;
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
int size;
struct _filter *f;
if (p->filteredlen<=0) {
int presize = READ_SIZE;
size = camel_stream_read(filter->source, p->buffer, READ_SIZE);
if (size<=0) {
/* this is somewhat untested */
if (camel_stream_eos(filter->source)) {
f = p->filters;
p->filtered = p->buffer;
p->filteredlen = 0;
while (f) {
camel_mime_filter_complete(f->filter, p->filtered, p->filteredlen, presize, &p->filtered, &p->filteredlen, &presize);
f = f->next;
}
size = p->filteredlen;
}
if (size<=0)
return size;
} else {
f = p->filters;
p->filtered = p->buffer;
p->filteredlen = size;
while (f) {
camel_mime_filter_filter(f->filter, p->filtered, p->filteredlen, presize, &p->filtered, &p->filteredlen, &presize);
f = f->next;
}
}
}
size = MIN(n, p->filteredlen);
memcpy(buffer, p->filtered, size);
p->filteredlen -= size;
p->filtered += size;
return size;
}
static gint do_write (CamelStream *stream, const gchar *buffer, gint n)
{
/* what semantics *should* this have?? */
g_warning("Writing to a non-writable stream");
return -1;
}
static void do_flush (CamelStream *stream)
{
/* NO OP */
}
static gboolean do_eos (CamelStream *stream)
{
CamelStreamFilter *filter = (CamelStreamFilter *)stream;
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
if (p->filteredlen >0)
return FALSE;
return camel_stream_eos(filter->source);
}
static void do_close (CamelStream *stream)
{
CamelStreamFilter *filter = (CamelStreamFilter *)stream;
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
p->filteredlen = 0;
camel_stream_close(filter->source);
}
static void do_reset (CamelStream *stream)
{
CamelStreamFilter *filter = (CamelStreamFilter *)stream;
struct _CamelStreamFilterPrivate *p = _PRIVATE(filter);
struct _filter *f;
p->filteredlen = 0;
camel_stream_reset(filter->source);
/* and reset filters */
f = p->filters;
while (f) {
camel_mime_filter_reset(f->filter);
f = f->next;
}
}
