root/ext/mbstring/libmbfl/filters/mbfilter_sjis.c

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DEFINITIONS

This source file includes following definitions.
  1. mbfl_filt_conv_sjis_wchar
  2. mbfl_filt_conv_wchar_sjis
  3. mbfl_filt_ident_sjis

/*
 * "streamable kanji code filter and converter"
 * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
 *
 * LICENSE NOTICES
 *
 * This file is part of "streamable kanji code filter and converter",
 * which is distributed under the terms of GNU Lesser General Public 
 * License (version 2) as published by the Free Software Foundation.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with "streamable kanji code filter and converter";
 * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
 * Suite 330, Boston, MA  02111-1307  USA
 *
 * The author of this file:
 *
 */
/*
 * The source code included in this files was separated from mbfilter_ja.c
 * by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
 * 
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "mbfilter.h"
#include "mbfilter_sjis.h"

#define UNICODE_TABLE_CP932_DEF
#define UNICODE_TABLE_JIS_DEF

#include "unicode_table_cp932_ext.h"
#include "unicode_table_jis.h"

int mbfl_filt_ident_sjis(int c, mbfl_identify_filter *filter);

const unsigned char mblen_table_sjis[] = { /* 0x80-0x9f,0xE0-0xFF */
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
};

static const char *mbfl_encoding_sjis_aliases[] = {"x-sjis", "SHIFT-JIS", NULL};

const mbfl_encoding mbfl_encoding_sjis = {
        mbfl_no_encoding_sjis,
        "SJIS",
        "Shift_JIS",
        (const char *(*)[])&mbfl_encoding_sjis_aliases,
        mblen_table_sjis,
        MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE
};

const struct mbfl_identify_vtbl vtbl_identify_sjis = {
        mbfl_no_encoding_sjis,
        mbfl_filt_ident_common_ctor,
        mbfl_filt_ident_common_dtor,
        mbfl_filt_ident_sjis
};

const struct mbfl_convert_vtbl vtbl_sjis_wchar = {
        mbfl_no_encoding_sjis,
        mbfl_no_encoding_wchar,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_sjis_wchar,
        mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_sjis = {
        mbfl_no_encoding_wchar,
        mbfl_no_encoding_sjis,
        mbfl_filt_conv_common_ctor,
        mbfl_filt_conv_common_dtor,
        mbfl_filt_conv_wchar_sjis,
        mbfl_filt_conv_common_flush
};

#define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)

#define SJIS_ENCODE(c1,c2,s1,s2)        \
                do {                                            \
                        s1 = c1;                                \
                        s1--;                                   \
                        s1 >>= 1;                               \
                        if ((c1) < 0x5f) {              \
                                s1 += 0x71;                     \
                        } else {                                \
                                s1 += 0xb1;                     \
                        }                                               \
                        s2 = c2;                                \
                        if ((c1) & 1) {                 \
                                if ((c2) < 0x60) {      \
                                        s2--;                   \
                                }                                       \
                                s2 += 0x20;                     \
                        } else {                                \
                                s2 += 0x7e;                     \
                        }                                               \
                } while (0)

#define SJIS_DECODE(c1,c2,s1,s2)        \
                do {                                            \
                        s1 = c1;                                \
                        if (s1 < 0xa0) {                \
                                s1 -= 0x81;                     \
                        } else {                                \
                                s1 -= 0xc1;                     \
                        }                                               \
                        s1 <<= 1;                               \
                        s1 += 0x21;                             \
                        s2 = c2;                                \
                        if (s2 < 0x9f) {                \
                                if (s2 < 0x7f) {        \
                                        s2++;                   \
                                }                                       \
                                s2 -= 0x20;                     \
                        } else {                                \
                                s1++;                           \
                                s2 -= 0x7e;                     \
                        }                                               \
                } while (0)


/*
 * SJIS => wchar
 */
int
mbfl_filt_conv_sjis_wchar(int c, mbfl_convert_filter *filter)
{
        int c1, s1, s2, w;

        switch (filter->status) {
        case 0:
                if (c >= 0 && c < 0x80) {       /* latin */
                        CK((*filter->output_function)(c, filter->data));
                } else if (c > 0xa0 && c < 0xe0) {      /* kana */
                        CK((*filter->output_function)(0xfec0 + c, filter->data));
                } else if (c > 0x80 && c < 0xfd && c != 0xa0) { /* kanji first char */
                        filter->status = 1;
                        filter->cache = c;
                } else {
                        w = c & MBFL_WCSGROUP_MASK;
                        w |= MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(w, filter->data));
                }
                break;

        case 1:         /* kanji second char */
                filter->status = 0;
                c1 = filter->cache;
                if (c >= 0x40 && c <= 0xfc && c != 0x7f) {
                        SJIS_DECODE(c1, c, s1, s2);
                        w = (s1 - 0x21)*94 + s2 - 0x21;
                        if (w >= 0 && w < jisx0208_ucs_table_size) {
                                w = jisx0208_ucs_table[w];
                        } else {
                                w = 0;
                        }
                        if (w <= 0) {
                                if (s1 < 0x7f && s2 < 0x7f) {
                                        w = (s1 << 8) | s2;
                                        w &= MBFL_WCSPLANE_MASK;
                                        w |= MBFL_WCSPLANE_JIS0208;
                                } else {
                                        w = (c1 << 8) | c;
                                        w &= MBFL_WCSGROUP_MASK;
                                        w |= MBFL_WCSGROUP_THROUGH;
                                }
                        }
                        CK((*filter->output_function)(w, filter->data));
                } else if ((c >= 0 && c < 0x21) || c == 0x7f) {         /* CTLs */
                        CK((*filter->output_function)(c, filter->data));
                } else {
                        w = (c1 << 8) | c;
                        w &= MBFL_WCSGROUP_MASK;
                        w |= MBFL_WCSGROUP_THROUGH;
                        CK((*filter->output_function)(w, filter->data));
                }
                break;

        default:
                filter->status = 0;
                break;
        }

        return c;
}

/*
 * wchar => SJIS
 */
int
mbfl_filt_conv_wchar_sjis(int c, mbfl_convert_filter *filter)
{
        int c1, c2, s1, s2;

        s1 = 0;
        if (c >= ucs_a1_jis_table_min && c < ucs_a1_jis_table_max) {
                s1 = ucs_a1_jis_table[c - ucs_a1_jis_table_min];
        } else if (c >= ucs_a2_jis_table_min && c < ucs_a2_jis_table_max) {
                s1 = ucs_a2_jis_table[c - ucs_a2_jis_table_min];
        } else if (c >= ucs_i_jis_table_min && c < ucs_i_jis_table_max) {
                s1 = ucs_i_jis_table[c - ucs_i_jis_table_min];
        } else if (c >= ucs_r_jis_table_min && c < ucs_r_jis_table_max) {
                s1 = ucs_r_jis_table[c - ucs_r_jis_table_min];
        }
        if (s1 <= 0) {
                c1 = c & ~MBFL_WCSPLANE_MASK;
                if (c1 == MBFL_WCSPLANE_JIS0208) {
                        s1 = c & MBFL_WCSPLANE_MASK;
                } else if (c == 0xa5) {         /* YEN SIGN */
                        s1 = 0x216f;    /* FULLWIDTH YEN SIGN */
                } else if (c == 0x203e) {       /* OVER LINE */
                        s1 = 0x2131;    /* FULLWIDTH MACRON */
                } else if (c == 0xff3c) {       /* FULLWIDTH REVERSE SOLIDUS */
                        s1 = 0x2140;
                } else if (c == 0xff5e) {       /* FULLWIDTH TILDE */
                        s1 = 0x2141;
                } else if (c == 0x2225) {       /* PARALLEL TO */
                        s1 = 0x2142;
                } else if (c == 0xff0d) {       /* FULLWIDTH HYPHEN-MINUS */
                        s1 = 0x215d;
                } else if (c == 0xffe0) {       /* FULLWIDTH CENT SIGN */
                        s1 = 0x2171;
                } else if (c == 0xffe1) {       /* FULLWIDTH POUND SIGN */
                        s1 = 0x2172;
                } else if (c == 0xffe2) {       /* FULLWIDTH NOT SIGN */
                        s1 = 0x224c;
                }
                if (c == 0) {
                        s1 = 0;
                } else if (s1 <= 0) {
                        s1 = -1;
                }
        } else if (s1 >= 0x8080) {
                s1 = -1;
        }
        if (s1 >= 0) {
                if (s1 < 0x100) { /* latin or kana */
                        CK((*filter->output_function)(s1, filter->data));
                } else { /* kanji */
                        c1 = (s1 >> 8) & 0xff;
                        c2 = s1 & 0xff;
                        SJIS_ENCODE(c1, c2, s1, s2);
                        CK((*filter->output_function)(s1, filter->data));
                        CK((*filter->output_function)(s2, filter->data));
                }
        } else {
                if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
                        CK(mbfl_filt_conv_illegal_output(c, filter));
                }
        }

        return c;
}

int mbfl_filt_ident_sjis(int c, mbfl_identify_filter *filter)
{
        if (filter->status) {           /* kanji second char */
                if (c < 0x40 || c > 0xfc || c == 0x7f) {        /* bad */
                    filter->flag = 1;
                }
                filter->status = 0;
        } else if (c >= 0 && c < 0x80) {        /* latin  ok */
                ;
        } else if (c > 0xa0 && c < 0xe0) {      /* kana  ok */
                ;
        } else if (c > 0x80 && c < 0xf0 && c != 0xa0) { /* kanji first char */
                filter->status = 1;
        } else {                                                        /* bad */
                filter->flag = 1;
        }

        return c;
}


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