/*
 * "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_iso2022_jp_ms.h"

#include "unicode_table_cp932_ext.h"
#include "unicode_table_jis.h"
#include "cp932_table.h"

static int mbfl_filt_ident_2022jpms(int c, mbfl_identify_filter *filter);

static const char *mbfl_encoding_2022jpms_aliases[] = {"ISO2022JPMS", NULL};

const mbfl_encoding mbfl_encoding_2022jpms = {
	mbfl_no_encoding_2022jpms,
	"ISO-2022-JP-MS",
	"ISO-2022-JP",
	(const char *(*)[])&mbfl_encoding_2022jpms_aliases,
	NULL,
	MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
};

const struct mbfl_identify_vtbl vtbl_identify_2022jpms = {
	mbfl_no_encoding_2022jpms,
	mbfl_filt_ident_common_ctor,
	mbfl_filt_ident_common_dtor,
	mbfl_filt_ident_2022jpms
};

const struct mbfl_convert_vtbl vtbl_2022jpms_wchar = {
	mbfl_no_encoding_2022jpms,
	mbfl_no_encoding_wchar,
	mbfl_filt_conv_common_ctor,
	mbfl_filt_conv_common_dtor,
	mbfl_filt_conv_2022jpms_wchar,
	mbfl_filt_conv_common_flush
};

const struct mbfl_convert_vtbl vtbl_wchar_2022jpms = {
	mbfl_no_encoding_wchar,
	mbfl_no_encoding_2022jpms,
	mbfl_filt_conv_common_ctor,
	mbfl_filt_conv_common_dtor,
	mbfl_filt_conv_wchar_2022jpms,
	mbfl_filt_conv_any_2022jpms_flush
};

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

#define sjistoidx(c1, c2) \
        (((c1) > 0x9f) \
        ? (((c1) - 0xc1) * 188 + (c2) - (((c2) > 0x7e) ? 0x41 : 0x40)) \
        : (((c1) - 0x81) * 188 + (c2) - (((c2) > 0x7e) ? 0x41 : 0x40)))
#define idxtojis1(c) (((c) / 94) + 0x21)
#define idxtojis2(c) (((c) % 94) + 0x21)

/*
 * ISO-2022-JP-MS => wchar
 */
int
mbfl_filt_conv_2022jpms_wchar(int c, mbfl_convert_filter *filter)
{
	int c1, s, w;

retry:
	switch (filter->status & 0xf) {
/*	case 0x00:	 ASCII */
/*	case 0x10:	 X 0201 latin */
/*	case 0x20:	 X 0201 kana */
/*	case 0x80:	 X 0208 */
/*	case 0xa0:	 UDC */
	case 0:
		if (c == 0x1b) {
			filter->status += 2;
		} else if (filter->status == 0x20 && c > 0x20 && c < 0x60) {		/* kana */
			CK((*filter->output_function)(0xff40 + c, filter->data));
		} else if ((filter->status == 0x80 || filter->status == 0xa0) && c > 0x20 && c < 0x80) {		/* kanji first char */
			filter->cache = c;
			filter->status += 1;
		} else if (c >= 0 && c < 0x80) {		/* latin, CTLs */
			CK((*filter->output_function)(c, filter->data));
		} else if (c > 0xa0 && c < 0xe0) {	/* GR kana */
			CK((*filter->output_function)(0xfec0 + c, filter->data));
		} else {
			w = c & MBFL_WCSGROUP_MASK;
			w |= MBFL_WCSGROUP_THROUGH;
			CK((*filter->output_function)(w, filter->data));
		}
		break;

/*	case 0x81:	 X 0208 second char */
/*	case 0xa1:	 UDC second char */
	case 1:
		w = 0;
		filter->status &= ~0xf;
		c1 = filter->cache;
		if (c > 0x20 && c < 0x7f) {
			s = (c1 - 0x21)*94 + c - 0x21;
			if (filter->status == 0x80) {
				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) {
						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 {
						w = 0;
					}
				}
				if (w <= 0) {
					w = (c1 << 8) | c;
					w &= MBFL_WCSPLANE_MASK;
					w |= MBFL_WCSPLANE_JIS0208;
				}
				CK((*filter->output_function)(w, filter->data));
			} else {
				if (c1 > 0x20 && c1 < 0x35) {
					w = 0xe000 + (c1 - 0x21)*94 + c - 0x21;
				}
				if (w <= 0) {
					w = (((c1 - 0x21) + 0x7f) << 8) | c;
					w &= MBFL_WCSPLANE_MASK;
					w |= MBFL_WCSPLANE_JIS0208;
				}
				CK((*filter->output_function)(w, filter->data));
			}
		} else if (c == 0x1b) {
			filter->status += 2;
		} 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;

	/* ESC */
/*	case 0x02:	*/
/*	case 0x12:	*/
/*	case 0x22:	*/
/*	case 0x82:	*/
/*	case 0xa2:	*/
	case 2:
		if (c == 0x24) {		/* '$' */
			filter->status++;
		} else if (c == 0x28) {		/* '(' */
			filter->status += 3;
		} else {
			filter->status &= ~0xf;
			CK((*filter->output_function)(0x1b, filter->data));
			goto retry;
		}
		break;

	/* ESC $ */
/*	case 0x03:	*/
/*	case 0x13:	*/
/*	case 0x23:	*/
/*	case 0x83:	*/
/*	case 0xa3:	*/
	case 3:
		if (c == 0x40 || c == 0x42) {	/* '@' or 'B' */
			filter->status = 0x80;
		} else if (c == 0x28) {     /* '(' */
			filter->status++;
		} else {
			filter->status &= ~0xf;
			CK((*filter->output_function)(0x1b, filter->data));
			CK((*filter->output_function)(0x24, filter->data));
			goto retry;
		}
		break;

	/* ESC $ ( */
/*	case 0x04:	*/
/*	case 0x14:	*/
/*	case 0x24:	*/
/*	case 0x84:	*/
/*	case 0xa4:	*/
	case 4:
		if (c == 0x40 || c == 0x42) {	/* '@' or 'B' */
			filter->status = 0x80;
		} else if (c == 0x3f) {			/* '?' */
			filter->status = 0xa0;
		} else {
			filter->status &= ~0xf;
			CK((*filter->output_function)(0x1b, filter->data));
			CK((*filter->output_function)(0x24, filter->data));
			CK((*filter->output_function)(0x28, filter->data));
			goto retry;
		}
		break;

	/* ESC ( */
/*	case 0x05:	*/
/*	case 0x15:	*/
/*	case 0x25:	*/
/*	case 0x85:	*/
/*	case 0xa5:	*/
	case 5:
		if (c == 0x42) {		/* 'B' */
			filter->status = 0;
		} else if (c == 0x4a) {		/* 'J' */
			filter->status = 0;
		} else if (c == 0x49) {		/* 'I' */
			filter->status = 0x20;
		} else {
			filter->status &= ~0xf;
			CK((*filter->output_function)(0x1b, filter->data));
			CK((*filter->output_function)(0x28, filter->data));
			goto retry;
		}
		break;

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

	return c;
}

static int
cp932ext3_cp932ext2_jis(int c)
{
	int idx;

	idx = sjistoidx(0xfa, 0x40) + c;
	if (idx >= sjistoidx(0xfa, 0x5c))
		idx -=  sjistoidx(0xfa, 0x5c) - sjistoidx(0xed, 0x40);
	else if (idx >= sjistoidx(0xfa, 0x55))
		idx -=  sjistoidx(0xfa, 0x55) - sjistoidx(0xee, 0xfa);
	else if (idx >= sjistoidx(0xfa, 0x40))
		idx -=  sjistoidx(0xfa, 0x40) - sjistoidx(0xee, 0xef);
	return idxtojis1(idx) << 8 | idxtojis2(idx);
}

/*
 * wchar => ISO-2022-JP-MS
 */
int
mbfl_filt_conv_wchar_2022jpms(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;
	}
	if (s1 <= 0) {
		c1 = c & ~MBFL_WCSPLANE_MASK;
		if (c1 == MBFL_WCSPLANE_WINCP932) {
			s1 = c & MBFL_WCSPLANE_MASK;
			s2 = 1;
		} else if (c1 == MBFL_WCSPLANE_JIS0208) {
			s1 = c & MBFL_WCSPLANE_MASK;
		} else if (c1 == MBFL_WCSPLANE_JIS0212) {
			s1 = c & MBFL_WCSPLANE_MASK;
			s1 |= 0x8080;
		} 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 ((s1 <= 0) || (s1 >= 0xa1a1 && 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 = cp932ext3_cp932ext2_jis(c1);
					break;
				}
				c1++;
			}
		}
		if (c == 0) {
			s1 = 0;
		} else if (s1 <= 0) {
			s1 = -1;
		}
	}
	if (s1 >= 0) {
		if (s1 < 0x80) { /* latin */
			if ((filter->status & 0xff00) != 0) {
				CK((*filter->output_function)(0x1b, filter->data));		/* ESC */
				CK((*filter->output_function)(0x28, filter->data));		/* '(' */
				CK((*filter->output_function)(0x42, filter->data));		/* 'B' */
			}
			CK((*filter->output_function)(s1, filter->data));
			filter->status = 0;
		} else if (s1 > 0xa0 && s1 < 0xe0) { /* kana */
			if ((filter->status & 0xff00) != 0x100) {
				CK((*filter->output_function)(0x1b, filter->data));		/* ESC */
				CK((*filter->output_function)(0x28, filter->data));		/* '(' */
				CK((*filter->output_function)(0x49, filter->data));		/* 'I' */
			}
			filter->status = 0x100;
			CK((*filter->output_function)(s1 & 0x7f, filter->data));
		} else if (s1 < 0x7e7f) { /* X 0208 */
			if ((filter->status & 0xff00) != 0x200) {
				CK((*filter->output_function)(0x1b, filter->data));		/* ESC */
				CK((*filter->output_function)(0x24, filter->data));		/* '$' */
				CK((*filter->output_function)(0x42, filter->data));		/* 'B' */
			}
			filter->status = 0x200;
			CK((*filter->output_function)((s1 >> 8) & 0xff, filter->data));
			CK((*filter->output_function)(s1 & 0x7f, filter->data));
		} else if (s1 < 0x927f) { /* UDC */
			if ((filter->status & 0xff00) != 0x800) {
				CK((*filter->output_function)(0x1b, filter->data));		/* ESC */
				CK((*filter->output_function)(0x24, filter->data));		/* '$' */
				CK((*filter->output_function)(0x28, filter->data));		/* '(' */
				CK((*filter->output_function)(0x3f, filter->data));		/* '?' */
			}
			filter->status = 0x800;
			CK((*filter->output_function)(((s1 >> 8) - 0x5e) & 0x7f, filter->data));
			CK((*filter->output_function)(s1 & 0x7f, 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_conv_any_2022jpms_flush(mbfl_convert_filter *filter)
{
	/* back to latin */
	if ((filter->status & 0xff00) != 0) {
		CK((*filter->output_function)(0x1b, filter->data));		/* ESC */
		CK((*filter->output_function)(0x28, filter->data));		/* '(' */
		CK((*filter->output_function)(0x42, filter->data));		/* 'B' */
	}
	filter->status &= 0xff;
	return 0;
}

static int mbfl_filt_ident_2022jpms(int c, mbfl_identify_filter *filter)
{
retry:
	switch (filter->status & 0xf) {
/*	case 0x00:	 ASCII */
/*	case 0x10:	 X 0201 latin */
/*	case 0x20:	 X 0201 kana */
/*	case 0x80:	 X 0208 */
/*	case 0xa0:	 X UDC */
	case 0:
		if (c == 0x1b) {
			filter->status += 2;
		} else if ((filter->status == 0x80 || filter->status == 0xa0) && c > 0x20 && c < 0x80) {		/* kanji first char */
			filter->status += 1;
		} else if (c >= 0 && c < 0x80) {		/* latin, CTLs */
			;
		} else {
			filter->flag = 1;	/* bad */
		}
		break;

/*	case 0x81:	 X 0208 second char */
/*	case 0xa1:	 UDC second char */
	case 1:
		filter->status &= ~0xf;
		if (c == 0x1b) {
			goto retry;
		} else if (c < 0x21 || c > 0x7e) {		/* bad */
			filter->flag = 1;
		}
		break;

	/* ESC */
	case 2:
		if (c == 0x24) {		/* '$' */
			filter->status++;
		} else if (c == 0x28) {		/* '(' */
			filter->status += 3;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	/* ESC $ */
	case 3:
		if (c == 0x40 || c == 0x42) {		/* '@' or 'B' */
			filter->status = 0x80;
		} else if (c == 0x28) {     /* '(' */
			filter->status++;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	/* ESC $ ( */
	case 4:
		if (c == 0x40 || c == 0x42) {		/* '@' or 'B' */
			filter->status = 0x80;
		} else if (c == 0x3f) {		/* '?' */
			filter->status = 0xa0;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

	/* ESC ( */
	case 5:
		if (c == 0x42) {		/* 'B' */
			filter->status = 0;
		} else if (c == 0x4a) {		/* 'J' */
			filter->status = 0;
		} else if (c == 0x49) {		/* 'I' */
			filter->status = 0x20;
		} else {
			filter->flag = 1;	/* bad */
			filter->status &= ~0xf;
			goto retry;
		}
		break;

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

	return c;
}
