/*-
 * 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 "dcmtk/config/osconfig.h"
#include "citrus_none.h"

#include "dcmtk/oficonv/iconv.h"

#include <sys/types.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>

#include "citrus_bcs.h"
#include "citrus_types.h"
#include "citrus_module.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 * ce,
    const void *var , size_t lenvar ,
    struct _citrus_stdenc_traits * et)
{
    (void) var;
    (void) lenvar;

    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 )
{
    (void) ce;
}

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

    return (0);
}

static int
_citrus_NONE_stdenc_mbtocs(struct _citrus_stdenc * ce ,
    _citrus_csid_t *csid, _citrus_index_t *idx, char **s, size_t n,
    void *ps , size_t *nresult, struct iconv_hooks *hooks)
{
    (void) ce;
    (void) ps;

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

    *csid = 0;
    *idx = (_citrus_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 * ce ,
    char *s, size_t n, _citrus_csid_t csid, _citrus_index_t idx, void *ps ,
    size_t *nresult, struct iconv_hooks *hooks )
{
    (void) ce;
    (void) ps;
    (void) hooks;

    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 * ce ,
    _citrus_wc_t * pwc, char ** s, size_t n,
    void * pspriv , size_t * nresult,
    struct iconv_hooks *hooks)
{
    (void) ce;
    (void) pspriv;

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

    if (pwc != NULL)
        *pwc = (_citrus_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 * ce ,
    char * s, size_t n, _citrus_wc_t wc,
    void * pspriv , size_t * nresult,
    struct iconv_hooks *hooks )
{
    (void) ce;
    (void) pspriv;
    (void) hooks;

    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 * ce ,
    char * s , size_t n ,
    void * pspriv , size_t * nresult)
{
    (void) ce;
    (void) s;
    (void) n;
    (void) pspriv;

    *nresult = 0;

    return (0);
}

static int
_citrus_NONE_stdenc_get_state_desc(struct _citrus_stdenc * ce ,
    void * ps , int id,
    struct _citrus_stdenc_state_desc * d)
{
    int ret = 0;
    (void) ce;
    (void) ps;

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

    return (ret);
}
