/* $NetBSD: citrus_none.c,v 1.18 2008/06/14 16:01:07 tnozaki Exp $ */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2002 Citrus Project,
 * Copyright (c) 2010 Gabor Kovesdan <gabor@FreeBSD.org>,
 * 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/types.h>

#include <assert.h>
#include <errno.h>
#include <iconv.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>

#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_none.h"
#include "citrus_stdenc.h"

_CITRUS_STDENC_DECLS(NONE);
_CITRUS_STDENC_DEF_OPS(NONE);
struct _citrus_stdenc_traits _citrus_NONE_stdenc_traits = {
        0,      /* et_state_size */
        1,      /* mb_cur_max */
};

static int
_citrus_NONE_stdenc_init(struct _citrus_stdenc * __restrict ce,
    const void *var __unused, size_t lenvar __unused,
    struct _citrus_stdenc_traits * __restrict et)
{

        et->et_state_size = 0;
        et->et_mb_cur_max = 1;

        ce->ce_closure = NULL;

        return (0);
}

static void
_citrus_NONE_stdenc_uninit(struct _citrus_stdenc *ce __unused)
{

}

static int
_citrus_NONE_stdenc_init_state(struct _citrus_stdenc * __restrict ce __unused,
    void * __restrict ps __unused)
{

        return (0);
}

static int
_citrus_NONE_stdenc_mbtocs(struct _citrus_stdenc * __restrict ce __unused,
    _csid_t *csid, _index_t *idx, char **s, size_t n,
    void *ps __unused, size_t *nresult, struct iconv_hooks *hooks)
{

        if (n < 1) {
                *nresult = (size_t)-2;
                return (0);
        }

        *csid = 0;
        *idx = (_index_t)(unsigned char)*(*s)++;
        *nresult = *idx == 0 ? 0 : 1;

        if ((hooks != NULL) && (hooks->uc_hook != NULL))
                hooks->uc_hook((unsigned int)*idx, hooks->data);

        return (0);
}

static int
_citrus_NONE_stdenc_cstomb(struct _citrus_stdenc * __restrict ce __unused,
    char *s, size_t n, _csid_t csid, _index_t idx, void *ps __unused,
    size_t *nresult, struct iconv_hooks *hooks __unused)
{

        if (csid == _CITRUS_CSID_INVALID) {
                *nresult = 0;
                return (0);
        }
        if (csid != 0)
                return (EILSEQ);

        if ((idx & 0x000000FF) == idx) {
                if (n < 1) {
                        *nresult = (size_t)-1;
                        return (E2BIG);
                }
                *s = (char)idx;
                *nresult = 1;
        } else if ((idx & 0x0000FFFF) == idx) {
                if (n < 2) {
                        *nresult = (size_t)-1;
                        return (E2BIG);
                }
                s[0] = (char)idx;
                /* XXX: might be endian dependent */
                s[1] = (char)(idx >> 8);
                *nresult = 2;
        } else if ((idx & 0x00FFFFFF) == idx) {
                if (n < 3) {
                        *nresult = (size_t)-1;
                        return (E2BIG);
                }
                s[0] = (char)idx;
                /* XXX: might be endian dependent */
                s[1] = (char)(idx >> 8);
                s[2] = (char)(idx >> 16);
                *nresult = 3;
        } else {
                if (n < 4) {
                        *nresult = (size_t)-1;
                        return (E2BIG);
                }
                s[0] = (char)idx;
                /* XXX: might be endian dependent */
                s[1] = (char)(idx >> 8);
                s[2] = (char)(idx >> 16);
                s[3] = (char)(idx >> 24);
                *nresult = 4;
        }
                
        return (0);
}

static int
_citrus_NONE_stdenc_mbtowc(struct _citrus_stdenc * __restrict ce __unused,
    _wc_t * __restrict pwc, char ** __restrict s, size_t n,
    void * __restrict pspriv __unused, size_t * __restrict nresult,
    struct iconv_hooks *hooks)
{

        if (*s == NULL) {
                *nresult = 0;
                return (0);
        }
        if (n == 0) {
                *nresult = (size_t)-2;
                return (0);
        }

        if (pwc != NULL)
                *pwc = (_wc_t)(unsigned char) **s;

        *nresult = **s == '\0' ? 0 : 1;

        if ((hooks != NULL) && (hooks->wc_hook != NULL))
                hooks->wc_hook(*pwc, hooks->data);

        return (0);
}

static int
_citrus_NONE_stdenc_wctomb(struct _citrus_stdenc * __restrict ce __unused,
    char * __restrict s, size_t n, _wc_t wc,
    void * __restrict pspriv __unused, size_t * __restrict nresult,
    struct iconv_hooks *hooks __unused)
{

        if ((wc & ~0xFFU) != 0) {
                *nresult = (size_t)-1;
                return (EILSEQ);
        }
        if (n == 0) {
                *nresult = (size_t)-1;
                return (E2BIG);
        }

        *nresult = 1;
        if (s != NULL && n > 0)
                *s = (char)wc;

        return (0);
}

static int
_citrus_NONE_stdenc_put_state_reset(struct _citrus_stdenc * __restrict ce __unused,
    char * __restrict s __unused, size_t n __unused,
    void * __restrict pspriv __unused, size_t * __restrict nresult)
{

        *nresult = 0;

        return (0);
}

static int
_citrus_NONE_stdenc_get_state_desc(struct _stdenc * __restrict ce __unused,
    void * __restrict ps __unused, int id,
    struct _stdenc_state_desc * __restrict d)
{
        int ret = 0;

        switch (id) {
        case _STDENC_SDID_GENERIC:
                d->u.generic.state = _STDENC_SDGEN_INITIAL;
                break;
        default:
                ret = EOPNOTSUPP;
        }

        return (ret);
}