/*	$NetBSD: citrus_mapper_646.c,v 1.4 2003/07/14 11:37:49 tshiozak Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c)2003 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <sys/queue.h>

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_module.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_mmap.h"
#include "citrus_hash.h"
#include "citrus_mapper.h"
#include "citrus_mapper_646.h"

/* ---------------------------------------------------------------------- */

_CITRUS_MAPPER_DECLS(mapper_646);
_CITRUS_MAPPER_DEF_OPS(mapper_646);

/* ---------------------------------------------------------------------- */

#define ILSEQ	0xFFFFFFFE
#define INVALID	0xFFFFFFFF
#define SPECIALS(x)				\
	x(0x23)					\
	x(0x24)					\
	x(0x40)					\
	x(0x5B)					\
	x(0x5C)					\
	x(0x5D)					\
	x(0x5E)					\
	x(0x60)					\
	x(0x7B)					\
	x(0x7C)					\
	x(0x7D)					\
	x(0x7E)

#define INDEX(x) INDEX_##x,

enum {
	SPECIALS(INDEX)
	NUM_OF_SPECIALS
};
struct _citrus_mapper_646 {
	_index_t	 m6_map[NUM_OF_SPECIALS];
	int		 m6_forward;
};

int
_citrus_mapper_646_mapper_getops(struct _citrus_mapper_ops *ops)
{

	memcpy(ops, &_citrus_mapper_646_mapper_ops,
	    sizeof(_citrus_mapper_646_mapper_ops));

	return (0);
}

#define T_COMM '#'
static int
parse_file(struct _citrus_mapper_646 *m6, const char *path)
{
	struct _memstream ms;
	struct _region r;
	const char *p;
	char *pp;
	size_t len;
	char buf[PATH_MAX];
	int i, ret;

	ret = _map_file(&r, path);
	if (ret)
		return (ret);
	_memstream_bind(&ms, &r);
	for (i = 0; i < NUM_OF_SPECIALS; i++) {
retry:
		p = _memstream_getln(&ms, &len);
		if (p == NULL) {
			ret = EINVAL;
			break;
		}
		p = _bcs_skip_ws_len(p, &len);
		if (*p == T_COMM || len==0)
			goto retry;
		if (!_bcs_isdigit(*p)) {
			ret = EINVAL;
			break;
		}
		snprintf(buf, sizeof(buf), "%.*s", (int)len, p);
		pp = __DECONST(void *, p);
		m6->m6_map[i] = strtoul(buf, (char **)&pp, 0);
		p = _bcs_skip_ws(buf);
		if (*p != T_COMM && !*p) {
			ret = EINVAL;
			break;
		}
	}
	_unmap_file(&r);

	return (ret);
};

static int
parse_var(struct _citrus_mapper_646 *m6, struct _memstream *ms,
    const char *dir)
{
	struct _region r;
	char path[PATH_MAX];

	m6->m6_forward = 1;
	_memstream_skip_ws(ms);
	/* whether backward */
	if (_memstream_peek(ms) == '!') {
		_memstream_getc(ms);
		m6->m6_forward = 0;
	}
	/* get description file path */
	_memstream_getregion(ms, &r, _memstream_remainder(ms));
	snprintf(path, sizeof(path), "%s/%.*s",
		 dir, (int)_region_size(&r), (char *)_region_head(&r));
	/* remove trailing white spaces */
	path[_bcs_skip_nonws(path)-path] = '\0';
	return (parse_file(m6, path));
}

static int
/*ARGSUSED*/
_citrus_mapper_646_mapper_init(struct _citrus_mapper_area *__restrict ma __unused,
    struct _citrus_mapper * __restrict cm, const char * __restrict dir,
    const void * __restrict var, size_t lenvar,
    struct _citrus_mapper_traits * __restrict mt, size_t lenmt)
{
	struct _citrus_mapper_646 *m6;
	struct _memstream ms;
	struct _region r;
	int ret;

	if (lenmt < sizeof(*mt))
		return (EINVAL);

	m6 = malloc(sizeof(*m6));
	if (m6 == NULL)
		return (errno);

	_region_init(&r, __DECONST(void *, var), lenvar);
	_memstream_bind(&ms, &r);
	ret = parse_var(m6, &ms, dir);
	if (ret) {
		free(m6);
		return (ret);
	}

	cm->cm_closure = m6;
	mt->mt_src_max = mt->mt_dst_max = 1;	/* 1:1 converter */
	mt->mt_state_size = 0;			/* stateless */

	return (0);
}

static void
/*ARGSUSED*/
_citrus_mapper_646_mapper_uninit(struct _citrus_mapper *cm)
{

	if (cm && cm->cm_closure)
		free(cm->cm_closure);
}

static int
/*ARGSUSED*/
_citrus_mapper_646_mapper_convert(struct _citrus_mapper * __restrict cm,
    _index_t * __restrict dst, _index_t src, void * __restrict ps __unused)
{
	struct _citrus_mapper_646 *m6;

	m6 = cm->cm_closure;
	if (m6->m6_forward) {
		/* forward */
		if (src >= 0x80)
			return (_MAPPER_CONVERT_ILSEQ);
#define FORWARD(x)					\
if (src == (x))	{					\
	if (m6->m6_map[INDEX_##x]==INVALID)		\
		return (_MAPPER_CONVERT_NONIDENTICAL);	\
	*dst = m6->m6_map[INDEX_##x];			\
	return (0);					\
} else
		SPECIALS(FORWARD);
		*dst = src;
	} else {
		/* backward */
#define BACKWARD(x)							\
if (m6->m6_map[INDEX_##x] != INVALID && src == m6->m6_map[INDEX_##x]) {	\
	*dst = (x);							\
	return (0);							\
} else if (src == (x))							\
	return (_MAPPER_CONVERT_ILSEQ);					\
else
		SPECIALS(BACKWARD);
		if (src >= 0x80)
			return (_MAPPER_CONVERT_NONIDENTICAL);
		*dst = src;
	}

	return (_MAPPER_CONVERT_SUCCESS);
}

static void
/*ARGSUSED*/
_citrus_mapper_646_mapper_init_state(void)
{

}
