/*
 * "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_sjis_open.c
 * by Rui Hirokawa <hirokawa@php.net> on 25 July 2011.
 *
 */

#include "mbfilter.h"
#include "mbfilter_sjis_mac.h"

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

#include "sjis_mac2uni.h"

extern const unsigned char mblen_table_sjis[];

static int mbfl_filt_conv_wchar_sjis_mac_flush(mbfl_convert_filter *filter);
static int mbfl_filt_conv_sjis_mac_wchar_flush(mbfl_convert_filter *filter);

static const char *mbfl_encoding_sjis_mac_aliases[] = {"MacJapanese", "x-Mac-Japanese", NULL};

const mbfl_encoding mbfl_encoding_sjis_mac = {
	mbfl_no_encoding_sjis_mac,
	"SJIS-mac",
	"Shift_JIS",
	mbfl_encoding_sjis_mac_aliases,
	mblen_table_sjis,
	MBFL_ENCTYPE_GL_UNSAFE,
	&vtbl_sjis_mac_wchar,
	&vtbl_wchar_sjis_mac
};

const struct mbfl_convert_vtbl vtbl_sjis_mac_wchar = {
	mbfl_no_encoding_sjis_mac,
	mbfl_no_encoding_wchar,
	mbfl_filt_conv_common_ctor,
	NULL,
	mbfl_filt_conv_sjis_mac_wchar,
	mbfl_filt_conv_sjis_mac_wchar_flush,
	NULL,
};

const struct mbfl_convert_vtbl vtbl_wchar_sjis_mac = {
	mbfl_no_encoding_wchar,
	mbfl_no_encoding_sjis_mac,
	mbfl_filt_conv_common_ctor,
	NULL,
	mbfl_filt_conv_wchar_sjis_mac,
	mbfl_filt_conv_wchar_sjis_mac_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-mac => wchar
 */
int
mbfl_filt_conv_sjis_mac_wchar(int c, mbfl_convert_filter *filter)
{
	int i, j, n;
	int c1, s, s1, s2, w;

	switch (filter->status) {
	case 0:
		if (c >= 0 && c < 0x80 && c != 0x5c) {	/* 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 <= 0xed && c != 0xa0) {	/* kanji first char */
			filter->status = 1;
			filter->cache = c;
		} else if (c == 0x5c) {
			CK((*filter->output_function)(0x00a5, filter->data));
		} else if (c == 0x80) {
			CK((*filter->output_function)(0x005c, filter->data));
		} else if (c == 0xa0) {
			CK((*filter->output_function)(0x00a0, filter->data));
		} else if (c == 0xfd) {
			CK((*filter->output_function)(0x00a9, filter->data));
		} else if (c == 0xfe) {
			CK((*filter->output_function)(0x2122, filter->data));
		} else if (c == 0xff) {
			CK((*filter->output_function)(0x2026, filter->data));
			CK((*filter->output_function)(0xf87f, filter->data));
		} else {
			CK((*filter->output_function)(MBFL_BAD_INPUT, 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 <= 0x89) {
				if (s == 0x1c) {
					w = 0x2014;		    /* EM DASH */
				} else if (s == 0x1f) {
					w = 0xff3c;			/* FULLWIDTH REVERSE SOLIDUS */
				} else if (s == 0x20) {
					w = 0x301c;			/* FULLWIDTH TILDE */
				} else if (s == 0x21) {
					w = 0x2016;			/* PARALLEL TO */
				} else if (s == 0x3c) {
					w = 0x2212;			/* FULLWIDTH HYPHEN-MINUS */
				} else if (s == 0x50) {
					w = 0x00a2;			/* FULLWIDTH CENT SIGN */
				} else if (s == 0x51) {
					w = 0x00a3;			/* FULLWIDTH POUND SIGN */
				} else if (s == 0x89) {
					w = 0x00ac;			/* FULLWIDTH NOT SIGN */
				}
			}

			/* apple gaiji area 0x8540 - 0x886d */
			if (w == 0) {
				for (i=0; i<7; i++) {
					if (s >= code_tbl[i][0] && s <= code_tbl[i][1]) {
						w = s - code_tbl[i][0] + code_tbl[i][2];
						break;
					}
				}
			}

			if (w == 0) {

				for (i=0; i<code_tbl_m_len; i++) {
					if (s == code_tbl_m[i][0]) {
						if (code_tbl_m[i][1] == 0xf860) {
							n = 4;
						} else if (code_tbl_m[i][1] == 0xf861) {
							n = 5;
						} else {
							n = 6;
						}
						for (j=1; j<n-1; j++) {
							CK((*filter->output_function)(code_tbl_m[i][j], filter->data));
						}
						w = code_tbl_m[i][n-1];
						break;
					}
				}
			}

			if (w == 0) {
				for (i=0; i<8; i++) {
					if (s >= code_ofst_tbl[i][0] && s <= code_ofst_tbl[i][1]) {
						w = code_map[i][s - code_ofst_tbl[i][0]];
						if (w == 0) {
							CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
							return 0;
						}
						s2 = 0;
						if (s >= 0x043e && s <= 0x0441) {
							s2 = 0xf87a;
						} else if (s == 0x03b1 || s == 0x03b7) {
							s2 = 0xf87f;
						} else if (s == 0x04b8 || s == 0x04b9 || s == 0x04c4) {
							s2 = 0x20dd;
						} else if (s == 0x1ed9 || s == 0x1eda || s == 0x1ee8 || s == 0x1ef3 ||
								   (s >= 0x1ef5 && s <= 0x1efb) || s == 0x1f05 || s == 0x1f06 ||
								   s == 0x1f18 || (s >= 0x1ff2 && s <= 0x20a5)) {
							s2 = 0xf87e;
						}
						if (s2 > 0) {
							CK((*filter->output_function)(w, filter->data));
							w = s2;
						}
						break;
					}
				}
			}

			if (w == 0 && s >= 0 && s < jisx0208_ucs_table_size) {	/* X 0208 */
				w = jisx0208_ucs_table[s];
			}

			if (w <= 0) {
				w = MBFL_BAD_INPUT;
			}
			CK((*filter->output_function)(w, filter->data));
		} else {
			CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
		}
		break;

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

	return 0;
}

static int mbfl_filt_conv_sjis_mac_wchar_flush(mbfl_convert_filter *filter)
{
	if (filter->status == 1) {
		CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
	}
	return 0;
}

/*
 * wchar => SJIS-mac
 */
int
mbfl_filt_conv_wchar_sjis_mac(int c, mbfl_convert_filter *filter)
{
	int i;
	int c1, c2, s1, s2, mode;

	s1 = 0;
	s2 = 0;

	// a1: U+0000 -> U+046F
	// a2: U+2000 -> U+30FF
	//  i: U+4E00 -> U+9FFF
	//  r: U+FF00 -> U+FFFF

	switch (filter->status) {

	case 1:
		c1 = filter->cache;
		filter->cache = 0;
		filter->status = 0;

		s1 = 0;
		s2 = 0;

		if (c == 0xf87a) {
			for (i=0;i<4;i++) {
				if (c1 == s_form_tbl[i+34+3+3]) {
					s1 = s_form_sjis_tbl[i+34+3+3];
					break;
				}
			}
			if (s1 <= 0) {
				s2 = c1;
			}
		} else if (c == 0x20dd) {
			for (i=0;i<3;i++) {
				if (c1 == s_form_tbl[i+34+3]) {
					s1 = s_form_sjis_tbl[i+34+3];
					break;
				}
			}
			if (s1 <= 0) {
				s2 = c1;
			}
		} else if (c == 0xf87f) {
			for (i=0;i<3;i++) {
				if (c1 == s_form_tbl[i+34]) {
					s1 = s_form_sjis_tbl[i+34];
					break;
				}
			}
			if (s1 <= 0) {
				s2 = c1; s1 = -1;
			}
		} else if (c == 0xf87e) {
			for (i=0;i<34;i++) {
				if (c1 == s_form_tbl[i]) {
					s1 = s_form_sjis_tbl[i];
					break;
				}
			}
			if (s1 <= 0) {
				s2 = c1; s1 = -1;
			}
		} else {
			s2 = c1;
			s1 = c;
		}

		if (s2 > 0) {
			for (i=0;i<s_form_tbl_len;i++) {
				if (c1 == s_form_tbl[i]) {
					s1 = s_form_sjis_fallback_tbl[i];
					break;
				}
			}
		}

		if (s1 >= 0) {
			if (s1 < 0x100) {
				CK((*filter->output_function)(s1, filter->data));
			} else {
				CK((*filter->output_function)((s1 >> 8) & 0xff, filter->data));
				CK((*filter->output_function)(s1 & 0xff, filter->data));
			}
		} else {
			CK(mbfl_filt_conv_illegal_output(c, filter));
		}

		if (s2 <= 0 || s1 == -1) {
			break;
		}
		s1 = s2 = 0;
		ZEND_FALLTHROUGH;

	case 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];
			if (c == 0x5c) {
				s1 = 0x80;
			} else if (c == 0xa9) {
				s1 = 0xfd;
			}
		} 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];
			if (c == 0x2122) {
				s1 = 0xfe;
			} else if (c == 0x2014) {
				s1 = 0x213d;
			} else if (c == 0x2116) {
				s1 = 0x2c1d;
			}
		} 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 (c >= 0x2000) {
			for (i=0;i<s_form_tbl_len;i++) {
				if (c == s_form_tbl[i]) {
					filter->status = 1;
					filter->cache = c;
					return 0;
				}
			}

			if (c == 0xf860 || c == 0xf861 || c == 0xf862) {
				/* Apple 'transcoding hint' codepoints (from private use area) */
				filter->status = 2;
				filter->cache = c;
				return 0;
			}
		}

		if (s1 <= 0) {
			if (c == 0xa0) {
				s1 = 0x00a0;
			} else if (c == 0xa5) { /* YEN SIGN */
				/* Unicode has codepoint 0xFFE5 for a fullwidth Yen sign;
				 * convert codepoint 0xA5 to halfwidth Yen sign */
				s1 = 0x5c; /* HALFWIDTH YEN SIGN */
			} else if (c == 0xff3c) {	/* FULLWIDTH REVERSE SOLIDUS */
				s1 = 0x2140;
			}
		}

		if (s1 <= 0) {
			for (i=0; i<wchar2sjis_mac_r_tbl_len; i++) {
				if (c >= wchar2sjis_mac_r_tbl[i][0] && c <= wchar2sjis_mac_r_tbl[i][1]) {
					s1 = c - wchar2sjis_mac_r_tbl[i][0] + wchar2sjis_mac_r_tbl[i][2];
					break;
				}
			}

			if (s1 <= 0) {
				for (i=0; i<wchar2sjis_mac_r_map_len; i++) {
					if (c >= wchar2sjis_mac_r_map[i][0] && c <= wchar2sjis_mac_r_map[i][1]) {
						s1 = wchar2sjis_mac_code_map[i][c-wchar2sjis_mac_r_map[i][0]];
						break;
					}
				}
			}

			if (s1 <= 0) {
				for (i=0; i<wchar2sjis_mac_wchar_tbl_len ; i++) {
					if ( c == wchar2sjis_mac_wchar_tbl[i][0]) {
						s1 = wchar2sjis_mac_wchar_tbl[i][1] & 0xffff;
						break;
					}
				}
			}

			if (s1 > 0) {
				c1 = s1/94+0x21;
				c2 = s1-94*(c1-0x21)+0x21;
				s1 = (c1 << 8) | c2;
				s2 = 1;
			}
		}

		if ((s1 <= 0) || (s1 >= 0x8080 && s2 == 0)) {	/* not found or X 0212 */
			s1 = -1;
			c1 = 0;

			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));
		}
		break;


	case 2:
		c1 = filter->cache;
		filter->cache = 0;
		filter->status = 0;
		if (c1 == 0xf860) {
			for (i=0; i<5; i++) {
				if (c == code_tbl_m[i][2]) {
					filter->cache = c | 0x10000;
					filter->status = 3;
					break;
				}
			}
		} else if (c1 == 0xf861) {
			for (i=0; i<3; i++) {
				if (c == code_tbl_m[i+5][2]) {
					filter->cache = c | 0x20000;
					filter->status = 3;
					break;
				}
			}
		} else if (c1 == 0xf862) {
			for (i=0; i<4; i++) {
				if (c == code_tbl_m[i+5+3][2]) {
					filter->cache = c | 0x40000;
					filter->status = 3;
					break;
				}
			}
		}

		if (filter->status == 0) {
			/* Didn't find any of expected codepoints after Apple transcoding hint */
			CK(mbfl_filt_conv_illegal_output(c1, filter));
			return mbfl_filt_conv_wchar_sjis_mac(c, filter);
		}

		break;

	case 3:
		s1 = 0;
		c1 = filter->cache & 0xffff;
		mode = (filter->cache & 0xf0000) >> 16;

		filter->cache = 0;
		filter->status = 0;

		if (mode == 0x1) {
			for (i=0; i<5; i++) {
				if (c1 == code_tbl_m[i][2] && c == code_tbl_m[i][3]) {
					s1 = code_tbl_m[i][0];
					break;
				}
			}

			if (s1 > 0) {
				c1 = s1/94+0x21;
				c2 = s1-94*(c1-0x21)+0x21;
				SJIS_ENCODE(c1, c2, s1, s2);
				CK((*filter->output_function)(s1, filter->data));
				CK((*filter->output_function)(s2, filter->data));
			}

			if (s1 <= 0) {
				CK(mbfl_filt_conv_illegal_output(0xf860, filter));
				CK(mbfl_filt_conv_illegal_output(c1, filter));
				CK(mbfl_filt_conv_illegal_output(c, filter));
			}

		} else if (mode == 0x2) {
			for (i=0; i<3; i++) {
				if (c1 == code_tbl_m[i+5][2] && c == code_tbl_m[i+5][3]) {
					filter->cache = c | 0x20000;
					filter->status = 4;
					break;
				}
			}
		} else if (mode == 0x4) {
			for (i=0; i<4; i++) {
				if (c1 == code_tbl_m[i+8][2] && c == code_tbl_m[i+8][3]) {
					filter->cache = c | 0x40000;
					filter->status = 4;
					break;
				}
			}
		}
		break;

	case 4:
		s1 = 0;
		c1 = filter->cache & 0xffff;
		mode = (filter->cache & 0xf0000) >> 16;

		filter->cache = 0;
		filter->status = 0;

		if (mode == 0x2) {
			for (i=0; i<3; i++) {
				if (c1 == code_tbl_m[i+5][3] && c == code_tbl_m[i+5][4]) {
					s1 = code_tbl_m[i+5][0];
					break;
				}
			}

			if (s1 > 0) {
				c1 = s1/94+0x21;
				c2 = s1-94*(c1-0x21)+0x21;
				SJIS_ENCODE(c1, c2, s1, s2);
				CK((*filter->output_function)(s1, filter->data));
				CK((*filter->output_function)(s2, filter->data));
			}

			if (s1 <= 0) {
				CK(mbfl_filt_conv_illegal_output(0xf861, filter));
				for (i=0; i<3; i++) {
					if (c1 == code_tbl_m[i+5][3]) {
						CK(mbfl_filt_conv_illegal_output(code_tbl_m[i+5][2], filter));
						break;
					}
				}
				CK(mbfl_filt_conv_illegal_output(c1, filter));
				CK(mbfl_filt_conv_illegal_output(c, filter));
			}
		} else if (mode == 0x4) {
			for (i=0; i<4; i++) {
				if (c1 == code_tbl_m[i+8][3] && c == code_tbl_m[i+8][4]) {
					filter->cache = c | 0x40000;
					filter->status = 5;
					break;
				}
			}
		}
		break;

	case 5:
		s1 = 0;
		c1 = filter->cache & 0xffff;
		mode = (filter->cache & 0xf0000) >> 16;

		filter->cache = 0;
		filter->status = 0;

		if (mode == 0x4) {
			for (i=0; i<4; i++) {
				if (c1 == code_tbl_m[i+8][4] && c == code_tbl_m[i+8][5]) {
					s1 = code_tbl_m[i+8][0];
					break;
				}
			}

			if (s1 > 0) {
				c1 = s1/94+0x21;
				c2 = s1-94*(c1-0x21)+0x21;
				SJIS_ENCODE(c1, c2, s1, s2);
				CK((*filter->output_function)(s1, filter->data));
				CK((*filter->output_function)(s2, filter->data));
			}

			if (s1 <= 0) {
				CK(mbfl_filt_conv_illegal_output(0xf862, filter));
				for (i=0; i<4; i++) {
					if (c1 == code_tbl_m[i+8][4]) {
						CK(mbfl_filt_conv_illegal_output( code_tbl_m[i+8][2], filter));
						CK(mbfl_filt_conv_illegal_output( code_tbl_m[i+8][3], filter));
						break;
					}
				}
				CK(mbfl_filt_conv_illegal_output(c1, filter));
				CK(mbfl_filt_conv_illegal_output(c, filter));
			}
		}
		break;

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

static int
mbfl_filt_conv_wchar_sjis_mac_flush(mbfl_convert_filter *filter)
{
	int i, c1, s1 = 0;
	if (filter->status == 1 && filter->cache > 0) {
		c1 = filter->cache;
		for (i=0;i<s_form_tbl_len;i++) {
			if (c1 == s_form_tbl[i]) {
				s1 = s_form_sjis_fallback_tbl[i];
				break;
			}
		}
		if (s1 > 0) {
			CK((*filter->output_function)((s1 >> 8) & 0xff, filter->data));
			CK((*filter->output_function)(s1 & 0xff, filter->data));
		}
	}
	filter->cache = 0;
	filter->status = 0;

	if (filter->flush_function != NULL) {
		return (*filter->flush_function)(filter->data);
	}

	return 0;
}
