#include "decode_converter.h"

#include <gio/gio.h>

static void decode_converter_interface_init(GConverterIface *iface);
static void decode_converter_finalize(GObject *object);

static GConverterResult decoder_converter_convert(GConverter *converter,
		const void *inbuf, gsize inbuf_size, void *outbuf, gsize outbuf_size,
		GConverterFlags flags, gsize *bytes_read, gsize *bytes_written,
		GError **error);
static void decode_converter_reset(GConverter *converter);

static GObjectClass *parent_class = NULL;

G_DEFINE_TYPE_WITH_CODE(DecodeConverter, decode_converter, G_TYPE_OBJECT,
		G_IMPLEMENT_INTERFACE(G_TYPE_CONVERTER,
			decode_converter_interface_init));

static void decode_converter_class_init(DecodeConverterClass *klass) {
	GObjectClass *object_class;

	parent_class = (GObjectClass*)g_type_class_peek_parent(klass);
	object_class = (GObjectClass*)klass;
	object_class->finalize = decode_converter_finalize;
}

static void decode_converter_interface_init(GConverterIface *iface) {
	iface->convert = decoder_converter_convert;
	iface->reset = decode_converter_reset;
}

static void decode_converter_init(DecodeConverter *self) {
}

static void decode_converter_finalize(GObject *object) {
	DecodeConverter *dc;

	g_assert(CONVERTER_IS_DECODE(object));

	dc = DECODE_CONVERTER(object);

	dc->decoder.decoder->close(dc->decoder.data);
}

static GConverterResult decoder_converter_convert(GConverter *converter,
		const void *inbuf, gsize inbuf_size, void *outbuf, gsize outbuf_size,
		GConverterFlags flags, gsize *bytes_read, gsize *bytes_written,
		GError **error) {
	DecodeConverter *dc;

	dc = (DecodeConverter*)converter;

	gssize size = dc->decoder.decoder->decode(dc->decoder.data, inbuf, inbuf_size, outbuf, outbuf_size);

	if(size < 0) {
		*error = g_error_new(g_quark_from_string("DecodeConverter"),
				size, "decode() returned %ld", size);
		return G_CONVERTER_ERROR;
	} else if(size == 0) {
		return G_CONVERTER_FINISHED;
	}
	*bytes_read = inbuf_size;
	*bytes_written = size;
	return G_CONVERTER_CONVERTED;
}

static void decode_converter_reset(GConverter *converter) {
	DecodeConverter *dc;

	dc = (DecodeConverter*)converter;

	dc->decoder.decoder->close(&dc->decoder.data);
}

DecodeConverter *decode_converter_new(const struct decoder_plugin *decoder_plugin) {
	DecodeConverter *dc;

	dc = (DecodeConverter*)g_object_new(CONVERTER_TYPE_DECODE, NULL);

	g_assert(dc != NULL);

	dc->decoder.decoder = decoder_plugin;
	dc->decoder.decoder->init(&dc->decoder.data);

	return dc;
}