/*-

 * Copyright (c)2002 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.

 */

/*

 *    ja_JP.SJIS locale table for BSD4.4/rune

 *    version 1.0

 *    (C) Sin'ichiro MIYATANI / Phase One, Inc

 *    May 12, 1995

 *

 * 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.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by Phase One, Inc.

 * 4. The name of Phase One, Inc. may be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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_mskanji.h"

#include <sys/types.h>

#include <errno.h>

#include <limits.h>

#include <stdbool.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"

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

 * private stuffs used by templates

 */

typedef struct _MSKanjiState {

    int  chlen;

    char     ch[2];

} _MSKanjiState;

typedef struct {

    int  mode;

#define MODE_JIS2004    1

} _MSKanjiEncodingInfo;

#define _CEI_TO_EI(_cei_)       (&(_cei_)->ei)

#define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_

#define _FUNCNAME(m)            _citrus_MSKanji_##m

#define _ENCODING_INFO          _MSKanjiEncodingInfo

#define _ENCODING_STATE         _MSKanjiState

#define _ENCODING_MB_CUR_MAX(_ei_)  2

#define _ENCODING_IS_STATE_DEPENDENT    0

#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)    0

static bool

_mskanji1(int c)

{

    return ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xfc));

}

static bool

_mskanji2(int c)

{

    return ((c >= 0x40 && c <= 0x7e) || (c >= 0x80 && c <= 0xfc));

}

static __inline void

/*ARGSUSED*/

_citrus_MSKanji_init_state(_MSKanjiEncodingInfo * ei ,

    _MSKanjiState * s)

{

    (void) ei;

    s->chlen = 0;

}

static int

/*ARGSUSED*/

_citrus_MSKanji_mbrtowc_priv(_MSKanjiEncodingInfo * ei,

    _citrus_wc_t * pwc, char ** s, size_t n,

    _MSKanjiState * psenc, size_t * nresult)

{

    char *s0;

    _citrus_wc_t wchar;

    int chlenbak, len;

    s0 = *s;

    if (s0 == NULL) {

        _citrus_MSKanji_init_state(ei, psenc);

        *nresult = 0; /* state independent */

        return (0);

    }

    chlenbak = psenc->chlen;

    /* make sure we have the first byte in the buffer */

    switch (psenc->chlen) {

    case 0:

        if (n < 1)

            goto restart;

        psenc->ch[0] = *s0++;

        psenc->chlen = 1;

        n--;

        break;

    case 1:

        break;

    default:

        /* illegal state */

        goto encoding_error;

    }

    len = _mskanji1(psenc->ch[0] & 0xff) ? 2 : 1;

    while (psenc->chlen < len) {

        if (n < 1)

            goto restart;

        psenc->ch[psenc->chlen] = *s0++;

        psenc->chlen++;

        n--;

    }

    *s = s0;

    switch (len) {

    case 1:

        wchar = psenc->ch[0] & 0xff;

        break;

    case 2:

        if (!_mskanji2(psenc->ch[1] & 0xff))

            goto encoding_error;

        wchar = ((psenc->ch[0] & 0xff) << 8) | (psenc->ch[1] & 0xff);

        break;

    default:

        /* illegal state */

        goto encoding_error;

    }

    psenc->chlen = 0;

    if (pwc)

        *pwc = wchar;

    *nresult = wchar ? len - chlenbak : 0;

    return (0);

encoding_error:

    psenc->chlen = 0;

    *nresult = (size_t)-1;

    return (EILSEQ);

restart:

    *nresult = (size_t)-2;

    *s = s0;

    return (0);

}

static int

_citrus_MSKanji_wcrtomb_priv(_MSKanjiEncodingInfo * ei ,

    char * s, size_t n, _citrus_wc_t wc,

    _MSKanjiState * psenc , size_t * nresult)

{

    int ret;

    (void) ei;

    (void) psenc;

    /* check invalid sequence */

    if (wc & ~0xffff) {

        ret = EILSEQ;

        goto err;

    }

    if (wc & 0xff00) {

        if (n < 2) {

            ret = E2BIG;

            goto err;

        }

        s[0] = (wc >> 8) & 0xff;

        s[1] = wc & 0xff;

        if (!_mskanji1(s[0] & 0xff) || !_mskanji2(s[1] & 0xff)) {

            ret = EILSEQ;

            goto err;

        }

        *nresult = 2;

        return (0);

    } else {

        if (n < 1) {

            ret = E2BIG;

            goto err;

        }

        s[0] = wc & 0xff;

        if (_mskanji1(s[0] & 0xff)) {

            ret = EILSEQ;

            goto err;

        }

        *nresult = 1;

        return (0);

    }

err:

    *nresult = (size_t)-1;

    return (ret);

}

static __inline int

/*ARGSUSED*/

_citrus_MSKanji_stdenc_wctocs(_MSKanjiEncodingInfo * ei,

    _citrus_csid_t * csid, _citrus_index_t * idx, _citrus_wc_t wc)

{

    _citrus_index_t col, row;

    int offset;

    if ((_citrus_wc_t)wc < 0x80) {

        /* ISO-646 */

        *csid = 0;

        *idx = (_citrus_index_t)wc;

    } else if ((_citrus_wc_t)wc < 0x100) {

        /* KANA */

        *csid = 1;

        *idx = (_citrus_index_t)wc & 0x7F;

    } else {

        /* Kanji (containing Gaiji zone) */

        /*

         * 94^2 zone (contains a part of Gaiji (0xED40 - 0xEEFC)):

         * 0x8140 - 0x817E -> 0x2121 - 0x215F

         * 0x8180 - 0x819E -> 0x2160 - 0x217E

         * 0x819F - 0x81FC -> 0x2221 - 0x227E

         *

         * 0x8240 - 0x827E -> 0x2321 - 0x235F

         *  ...

         * 0x9F9F - 0x9FFc -> 0x5E21 - 0x5E7E

         *

         * 0xE040 - 0xE07E -> 0x5F21 - 0x5F5F

         *  ...

         * 0xEF9F - 0xEFFC -> 0x7E21 - 0x7E7E

         *

         * extended Gaiji zone:

         * 0xF040 - 0xFCFC

         *

         * JIS X0213-plane2:

         * 0xF040 - 0xF09E -> 0x2121 - 0x217E

         * 0xF140 - 0xF19E -> 0x2321 - 0x237E

         * ...

         * 0xF240 - 0xF29E -> 0x2521 - 0x257E

         *

         * 0xF09F - 0xF0FC -> 0x2821 - 0x287E

         * 0xF29F - 0xF2FC -> 0x2C21 - 0x2C7E

         * ...

         * 0xF44F - 0xF49E -> 0x2F21 - 0x2F7E

         *

         * 0xF49F - 0xF4FC -> 0x6E21 - 0x6E7E

         * ...

         * 0xFC9F - 0xFCFC -> 0x7E21 - 0x7E7E

         */

        row = ((_citrus_wc_t)wc >> 8) & 0xFF;

        col = (_citrus_wc_t)wc & 0xFF;

        if (!_mskanji1(row) || !_mskanji2(col))

            return (EILSEQ);

        if ((ei->mode & MODE_JIS2004) == 0 || row < 0xF0) {

            *csid = 2;

            offset = 0x81;

        } else {

            *csid = 3;

            if ((_citrus_wc_t)wc <= 0xF49E) {

                offset = (_citrus_wc_t)wc >= 0xF29F ||

                    ((_citrus_wc_t)wc >= 0xF09F &&

                    (_citrus_wc_t)wc <= 0xF0FC) ? 0xED : 0xF0;

            } else

                offset = 0xCE;

        }

        row -= offset;

        if (row >= 0x5F)

            row -= 0x40;

        row = row * 2 + 0x21;

        col -= 0x1F;

        if (col >= 0x61)

            col -= 1;

        if (col > 0x7E) {

            row += 1;

            col -= 0x5E;

        }

        *idx = ((_citrus_index_t)row << 8) | col;

    }

    return (0);

}

static __inline int

/*ARGSUSED*/

_citrus_MSKanji_stdenc_cstowc(_MSKanjiEncodingInfo * ei,

    _citrus_wc_t * wc, _citrus_csid_t csid, _citrus_index_t idx)

{

    uint32_t col, row;

    int offset;

    switch (csid) {

    case 0:

        /* ISO-646 */

        if (idx >= 0x80)

            return (EILSEQ);

        *wc = (_citrus_wc_t)idx;

        break;

    case 1:

        /* kana */

        if (idx >= 0x80)

            return (EILSEQ);

        *wc = (_citrus_wc_t)idx + 0x80;

        break;

    case 3:

        if ((ei->mode & MODE_JIS2004) == 0)

            return (EILSEQ);

    /*FALLTHROUGH*/

    case 2:

        /* kanji */

        row = (idx >> 8);

        if (row < 0x21)

            return (EILSEQ);

        if (csid == 3) {

            if (row <= 0x2F)

                offset = (row == 0x22 || row >= 0x26) ?

                    0xED : 0xF0;

            else if (row >= 0x4D && row <= 0x7E)

                offset = 0xCE;

            else

                return (EILSEQ);

        } else {

            if (row > 0x97)

                return (EILSEQ);

            offset = (row < 0x5F) ? 0x81 : 0xC1;

        }

        col = idx & 0xFF;

        if (col < 0x21 || col > 0x7E)

            return (EILSEQ);

        row -= 0x21; col -= 0x21;

        if ((row & 1) == 0) {

            col += 0x40;

            if (col >= 0x7F)

                col += 1;

        } else

            col += 0x9F;

        row = row / 2 + offset;

        *wc = ((_citrus_wc_t)row << 8) | col;

        break;

    default:

        return (EILSEQ);

    }

    return (0);

}

static __inline int

/*ARGSUSED*/

_citrus_MSKanji_stdenc_get_state_desc_generic(_MSKanjiEncodingInfo * ei ,

    _MSKanjiState * psenc, int * rstate)

{

    (void) ei;

    *rstate = (psenc->chlen == 0) ? _CITRUS_STDENC_SDGEN_INITIAL :

        _CITRUS_STDENC_SDGEN_INCOMPLETE_CHAR;

    return (0);

}

static int

/*ARGSUSED*/

_citrus_MSKanji_encoding_module_init(_MSKanjiEncodingInfo *  ei,

    const void * var, size_t lenvar)

{

    const char *p;

    p = var;

    memset((void *)ei, 0, sizeof(*ei));

    while (lenvar > 0) {

        switch (_citrus_bcs_toupper(*p)) {

        case 'J':

            MATCH(JIS2004, ei->mode |= MODE_JIS2004);

            break;

        }

        ++p;

        --lenvar;

    }

    return (0);

}

static void

_citrus_MSKanji_encoding_module_uninit(_MSKanjiEncodingInfo *ei )

{

    (void) ei;

}

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

 * public interface for stdenc

 */

_CITRUS_STDENC_DECLS(MSKanji);

_CITRUS_STDENC_DEF_OPS(MSKanji);

#include "citrus_stdenc_template.h"