/*      $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)
{

}