/*  _______         ____    __         ___    ___
 * \    _  \       \    /  \  /       \   \  /   /       '   '  '
 *  |  | \  \       |  |    ||         |   \/   |         .      .
 *  |  |  |  |      |  |    ||         ||\  /|  |
 *  |  |  |  |      |  |    ||         || \/ |  |         '  '  '
 *  |  |  |  |      |  |    ||         ||    |  |         .      .
 *  |  |_/  /        \  \__//          ||    |  |
 * /_______/ynamic    \____/niversal  /__\  /____\usic   /|  .  . ibliotheque
 *                                                      /  \
 *                                                     / .  \
 * readduh.c - Code to read a DUH from an open        / / \  \
 *             file.                                 | <  /   \_
 *                                                   |  \/ /\   /
 * By entheh.                                         \_  /  > /
 *                                                      | \ / /
 *                                                      |  ' /
 *                                                       \__/
 */

#include <stdlib.h>

#include "dumb.h"
#include "internal/dumb.h"



static DUH_SIGNAL *read_signal(DUH *duh, DUMBFILE *f)
{
	DUH_SIGNAL *signal;
	long type;

	signal = malloc(sizeof(*signal));

	if (!signal)
		return NULL;

	type = dumbfile_mgetl(f);
	if (dumbfile_error(f)) {
		free(signal);
		return NULL;
	}

	signal->desc = _dumb_get_sigtype_desc(type);
	if (!signal->desc) {
		free(signal);
		return NULL;
	}

	if (signal->desc->load_sigdata) {
		signal->sigdata = (*signal->desc->load_sigdata)(duh, f);
		if (!signal->sigdata) {
			free(signal);
			return NULL;
		}
	} else
		signal->sigdata = NULL;

	return signal;
}



/* read_duh(): reads a DUH from an already open DUMBFILE, and returns its
 * pointer, or null on error. The file is not closed.
 */
DUH *read_duh(DUMBFILE *f)
{
	DUH *duh;
	int i;

	if (dumbfile_mgetl(f) != DUH_SIGNATURE)
		return NULL;

	duh = malloc(sizeof(*duh));
	if (!duh)
		return NULL;

	duh->length = dumbfile_igetl(f);
	if (dumbfile_error(f) || duh->length <= 0) {
		free(duh);
		return NULL;
	}

	duh->n_signals = dumbfile_igetl(f);
	if (dumbfile_error(f) || duh->n_signals <= 0) {
		free(duh);
		return NULL;
	}

	duh->signal = malloc(sizeof(*duh->signal) * duh->n_signals);
	if (!duh->signal) {
		free(duh);
		return NULL;
	}

	for (i = 0; i < duh->n_signals; i++)
		duh->signal[i] = NULL;

	for (i = 0; i < duh->n_signals; i++) {
		if (!(duh->signal[i] = read_signal(duh, f))) {
			unload_duh(duh);
			return NULL;
		}
	}

	return duh;
}