/* *****************************************************************************
 * encode/main.c -- encode a file.
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of libg1m.
 * libg1m is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3.0 of the License,
 * or (at your option) any later version.
 *
 * libg1m 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libg1m; if not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************** */
#include <libg1m/internals.h>
#define FUNCS(NAME) g1m_announce_##NAME, g1m_encode_##NAME

/* ************************************************************************** */
/*  Correspondances                                                           */
/* ************************************************************************** */
/* Types */
typedef int (*announce_t)(g1m_handle_t*, size_t*);
typedef int (*encode_t)(g1m_handle_t*, g1m_buffer_t*);
struct corresp {
	/* 'identification' */
	g1m_type_t types;
	g1m_platform_t platforms;

	/* functions */
	announce_t announce;
	encode_t encode;
};

/* All correspondances */
static const struct corresp encodings[] = {
	/* add-in types */
	{g1m_type_addin, g1m_platform_fx, FUNCS(addin)},

	/* sentinel */
	{0, 0, NULL, NULL}
};
/* ************************************************************************** */
/*  Main function                                                             */
/* ************************************************************************** */
/**
 *	g1m_encode:
 *	Encode a file.
 *
 *	@arg	handle		the handle.
 *	@arg	buffer		the buffer to write to.
 *	@return				the error code (0 if ok).
 */

int g1m_encode(g1m_handle_t *handle, g1m_buffer_t *buffer)
{
	int err;

	/* find the announcement and encoding function */
	const struct corresp *c = encodings - 1;
	while ((++c)->encode) {
		if (c->types && !(c->types & handle->type))
			continue;
		if (c->platforms && !(c->platforms & handle->platform))
			continue;
		break;
	}
	if (!c->encode) return (g1m_error_op);

	/* announce, if necessary */
	if (buffer->announce) {
		size_t size = 0;
		if ((err = (*c->announce)(handle, &size))
		 || (err = (*buffer->announce)(buffer->cookie, size)))
			return (err);
	}

	/* encode */
	if (buffer->write) {
		err = (*c->encode)(handle, buffer);
		if (err) {
			(*buffer->unannounce)(buffer->cookie);
			return (err);
		}
	}

	/* everything went well! */
	return (0);
}