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/*
* Gypsy
*
* A simple to use and understand GPSD replacement
* that uses D-Bus, GLib and memory allocations
*
* Author: Iain Holmes <iain@sleepfive.com>
* Copyright (C) 2011
*
* 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 <string.h>
#include <glib.h>
#include "nmea-parser.h"
#include "gypsy-nmea-parser.h"
#define READ_BUFFER_SIZE 1024
struct _GypsyNmeaParserPrivate {
NMEAParseContext *ctxt;
char buffer[READ_BUFFER_SIZE + 1]; /* This is for building
the NMEA sentence */
gsize chars_in_buffer; /* How many characters are in the buffer */
};
#define GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GYPSY_TYPE_NMEA_PARSER, GypsyNmeaParserPrivate))
G_DEFINE_TYPE (GypsyNmeaParser, gypsy_nmea_parser, GYPSY_TYPE_PARSER);
static void
gypsy_nmea_parser_finalize (GObject *object)
{
GypsyNmeaParser *self = (GypsyNmeaParser *) object;
GypsyNmeaParserPrivate *priv = self->priv;
if (priv->ctxt) {
nmea_parse_context_free (priv->ctxt);
priv->ctxt = NULL;
}
G_OBJECT_CLASS (gypsy_nmea_parser_parent_class)->finalize (object);
}
static void
gypsy_nmea_parser_dispose (GObject *object)
{
#if 0
GypsyNmeaParser *self = (GypsyNmeaParser *) object;
#endif
G_OBJECT_CLASS (gypsy_nmea_parser_parent_class)->dispose (object);
}
static GObject *
gypsy_nmea_parser_constructor (GType type,
guint n_params,
GObjectConstructParam *params)
{
GypsyNmeaParser *parser;
GypsyNmeaParserPrivate *priv;
GypsyClient *client;
GObject *object;
object = G_OBJECT_CLASS (gypsy_nmea_parser_parent_class)->constructor
(type, n_params, params);
parser = GYPSY_NMEA_PARSER (object);
priv = parser->priv;
g_object_get (object,
"client", &client,
NULL);
priv->ctxt = nmea_parse_context_new (client);
return object;
}
static gboolean
gypsy_nmea_parser_received_data (GypsyParser *parser,
gsize length,
GError **error)
{
GypsyNmeaParser *nmea = GYPSY_NMEA_PARSER (parser);
GypsyNmeaParserPrivate *priv = nmea->priv;
char *eos = NULL;
priv->chars_in_buffer += length;
/* Append a '\0' to the data so we never run off the end.
The '\0' will be overwritten by the next call to received_data */
*(priv->buffer + priv->chars_in_buffer) = '\0';
/* NMEA sentences end with <CR><LF>,
so find the <CR> at the end of each sentence */
while ((eos = strchr (priv->buffer, '\r'))) {
int sentence_length;
/* Account for <LF> */
sentence_length = (eos - priv->buffer);
if (*(eos + 1) == '\n') {
sentence_length += 2;
} else {
sentence_length += 1;
}
if (sentence_length > 1) {
/* terminate the string at the <CR> */
*eos = '\0';
g_debug ("NMEA sentence: %s", priv->buffer);
if (nmea_parse_sentence (priv->ctxt, priv->buffer, NULL) == FALSE) {
g_debug ("Invalid sentence: %s", priv->buffer);
}
}
if (sentence_length > 0) {
/* Remove the sentence from the buffer and
move the rest up including terminating 0 */
memmove (priv->buffer, eos + 2,
(priv->chars_in_buffer - sentence_length) + 1);
priv->chars_in_buffer -= sentence_length;
}
}
return TRUE;
}
static gsize
gypsy_nmea_parser_get_buffer (GypsyParser *parser,
gchar **buffer)
{
GypsyNmeaParser *nmea = GYPSY_NMEA_PARSER (parser);
GypsyNmeaParserPrivate *priv = nmea->priv;
if (priv->chars_in_buffer >= READ_BUFFER_SIZE) {
priv->chars_in_buffer = 0;
}
*buffer = (priv->buffer + priv->chars_in_buffer);
return READ_BUFFER_SIZE - priv->chars_in_buffer;
}
static void
gypsy_nmea_parser_class_init (GypsyNmeaParserClass *klass)
{
GObjectClass *o_class = (GObjectClass *) klass;
GypsyParserClass *p_class = (GypsyParserClass *) klass;
o_class->dispose = gypsy_nmea_parser_dispose;
o_class->finalize = gypsy_nmea_parser_finalize;
o_class->constructor = gypsy_nmea_parser_constructor;
p_class->received_data = gypsy_nmea_parser_received_data;
p_class->get_buffer = gypsy_nmea_parser_get_buffer;
g_type_class_add_private (klass, sizeof (GypsyNmeaParserPrivate));
}
static void
gypsy_nmea_parser_init (GypsyNmeaParser *self)
{
GypsyNmeaParserPrivate *priv = GET_PRIVATE (self);
self->priv = priv;
}
GypsyParser *
gypsy_nmea_parser_new (GypsyClient *client)
{
g_return_val_if_fail (GYPSY_IS_CLIENT (client), NULL);
return (GypsyParser *) g_object_new (GYPSY_TYPE_NMEA_PARSER,
"client", client,
NULL);
}
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