text: /*
   * "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.
   *
   */
  
  #include "mbfilter.h"
  #include "mbfilter_sjis_open.h"
  
  #include "unicode_table_cp932_ext.h"
  #include "unicode_table_jis.h"
  
  static 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_open_aliases[] = {"SJIS-open", "SJIS-ms", NULL};
  
  const mbfl_encoding mbfl_encoding_sjis_open = {
  	mbfl_no_encoding_sjis_open,
  	"SJIS-win",
  	"Shift_JIS",
  	mbfl_encoding_sjis_open_aliases,
  	mblen_table_sjis,
  	MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE,
  	&vtbl_sjis_open_wchar,
  	&vtbl_wchar_sjis_open
  };
  
  const struct mbfl_convert_vtbl vtbl_sjis_open_wchar = {
  	mbfl_no_encoding_sjis_open,
  	mbfl_no_encoding_wchar,
  	mbfl_filt_conv_common_ctor,
  	NULL,
  	mbfl_filt_conv_sjis_open_wchar,
  	mbfl_filt_conv_common_flush,
  	NULL,
  };
  
  const struct mbfl_convert_vtbl vtbl_wchar_sjis_open = {
  	mbfl_no_encoding_wchar,
  	mbfl_no_encoding_sjis_open,
  	mbfl_filt_conv_common_ctor,
  	NULL,
  	mbfl_filt_conv_wchar_sjis_open,
  	mbfl_filt_conv_common_flush,
  	NULL,
  };
  
  #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-win => wchar
   */
  int
  mbfl_filt_conv_sjis_open_wchar(int c, mbfl_convert_filter *filter)
  {
  	int c1, s, 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) {
  			w = 0;
  			SJIS_DECODE(c1, c, s1, s2);
  			s = (s1 - 0x21)*94 + s2 - 0x21;
  			if (s <= 137) {
  				if (s == 31) {
  					w = 0xff3c;			/* FULLWIDTH REVERSE SOLIDUS */
  				} else if (s == 32) {
  					w = 0xff5e;			/* FULLWIDTH TILDE */
  				} else if (s == 33) {
  					w = 0x2225;			/* PARALLEL TO */
  				} else if (s == 60) {
  					w = 0xff0d;			/* FULLWIDTH HYPHEN-MINUS */
  				} else if (s == 80) {
  					w = 0xffe0;			/* FULLWIDTH CENT SIGN */
  				} else if (s == 81) {
  					w = 0xffe1;			/* FULLWIDTH POUND SIGN */
  				} else if (s == 137) {
  					w = 0xffe2;			/* FULLWIDTH NOT SIGN */
  				}
  			}
  			if (w == 0) {
  				if (s >= cp932ext1_ucs_table_min && s < cp932ext1_ucs_table_max) {		/* vendor ext1 (13ku) */
  					w = cp932ext1_ucs_table[s - cp932ext1_ucs_table_min];
  				} else if (s >= 0 && s < jisx0208_ucs_table_size) {		/* X 0208 */
  					w = jisx0208_ucs_table[s];
  				} else if (s >= cp932ext2_ucs_table_min && s < cp932ext2_ucs_table_max) {		/* vendor ext2 (89ku - 92ku) */
  					w = cp932ext2_ucs_table[s - cp932ext2_ucs_table_min];
  				} else if (s >= cp932ext3_ucs_table_min && s < cp932ext3_ucs_table_max) {		/* vendor ext3 (115ku - 119ku) */
  					w = cp932ext3_ucs_table[s - cp932ext3_ucs_table_min];
  				} else if (s >= (94*94) && s < (114*94)) {		/* user (95ku - 114ku) */
  					w = s - (94*94) + 0xe000;
  				}
  			}
  			if (w <= 0) {
  				w = (s1 << 8) | s2;
  				w &= MBFL_WCSPLANE_MASK;
  				w |= MBFL_WCSPLANE_WINCP932;
  			}
  			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-win
   */
  int
  mbfl_filt_conv_wchar_sjis_open(int c, mbfl_convert_filter *filter)
  {
  	int c1, c2, s1, s2;
  
  	s1 = 0;
  	s2 = 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];
  	} else if (c >= 0xe000 && c < (0xe000 + 20*94)) {	/* user  (95ku - 114ku) */
  		s1 = c - 0xe000;
  		c1 = s1/94 + 0x7f;
  		c2 = s1%94 + 0x21;
  		s1 = (c1 << 8) | c2;
  		s2 = 1;
  	}
  	if (s1 <= 0) {
  		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 ((s1 <= 0) || (s1 >= 0x8080 && s2 == 0)) {	/* not found or X 0212 */
  		s1 = -1;
  		c1 = 0;
  		c2 = cp932ext1_ucs_table_max - cp932ext1_ucs_table_min;
  		while (c1 < c2) {		/* CP932 vendor ext1 (13ku) */
  			if (c == cp932ext1_ucs_table[c1]) {
  				s1 = ((c1/94 + 0x2d) << 8) + (c1%94 + 0x21);
  				break;
  			}
  			c1++;
  		}
  		if (s1 <= 0) {
  			c1 = 0;
  			c2 = cp932ext3_ucs_table_max - cp932ext3_ucs_table_min;
  			while (c1 < c2) {		/* CP932 vendor ext3 (115ku - 119ku) */
  				if (c == cp932ext3_ucs_table[c1]) {
  					s1 = ((c1/94 + 0x93) << 8) + (c1%94 + 0x21);
  					break;
  				}
  				c1++;
  			}
  		}
  		if (c == 0) {
  			s1 = 0;
  		} else if (s1 <= 0) {
  			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 {
  		CK(mbfl_filt_conv_illegal_output(c, filter));
  	}
  
  	return c;
  }
  