/* *****************************************************************************
 * decode/std/mcs.c -- decode an MCS archive 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>
#include <stdlib.h>

/**
 *	g1m_decode_std_mcs:
 *	Decode an MCS file, after the Standard Header.
 *
 *	@arg	h			the handle to make.
 *	@arg	buffer		the buffer to read from.
 *	@arg	num			number of sizes.
 *	@return				the error code (0 if ok).
 */

int g1m_decode_std_mcs(g1m_handle_t **h, g1m_buffer_t *buffer,
	struct standard_header *std)
{
	int err = g1m_error_alloc;
	/* get number of subparts from the standard header */
	uint_fast16_t num = std->number;
	uint_fast32_t i;

	/* make the handle */
	err = g1m_make_mcs(h, num);
	if (err) return (err);
	g1m_handle_t *handle = *h;

	/* read all of the parts */
	log_info("%" PRIuFAST16 " total mcs files to browse", num);
	for (handle->g1m_handle_count = 0; handle->g1m_handle_count < (int)num;) {
		/* get the subheader */
		GDREAD(hd, mcs_subheader)

		/* correct endianess */
		hd.subcount = be32toh(hd.subcount);

		/* log info about part */
		log_info("New group! Group name is '%.16s'.", hd.intname);
		log_info("%d mcs files to browse in that group", hd.subcount);

		/* foreach subpart */
		for (i = 0; i < hd.subcount; i++) {
			/* get the part header */
			GDREAD(fhd, mcs_fileheader)
			fhd.datalength = be32toh(fhd.datalength);

			/* log info about the subpart */
			log_info("[%" PRIuFAST32 "] directory name is '%.8s'",
				i, fhd.dirname);
			log_info("[%" PRIuFAST32 "] filename is '%.8s'", i, fhd.filename);
			log_info("[%" PRIuFAST32 "] data length is %" PRIu32,
				i, fhd.datalength);

			/* decode the head */
			g1m_mcshead_t head;
			g1m_decode_mcsfile_head(&head, fhd.filetype, hd.intname,
				fhd.dirname, fhd.filename, fhd.datalength);

			/* decode */
			handle->g1m_handle_files[handle->g1m_handle_count] = NULL;
			err = g1m_decode_mcsfile(
				&handle->g1m_handle_files[handle->g1m_handle_count],
				&head, buffer);
			if (err) goto fail;
			handle->g1m_handle_count++;
		}
	}

	/* no error */
	return (0);

	/* was error! */
fail:
	g1m_free(*h); *h = NULL;
	return (err);
}