/*
 * Copyright (c) 1991-1994  Sony Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL SONY CORPORATION BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Sony Corporation
 * shall not be used in advertising or otherwise to promote the sale, use
 * or other dealings in this Software without prior written authorization
 * from Sony Corporation.
 *
 */

#include "sj_euc.h"
#include "sj_kcnv.h"
#include "kanakan.h"

static unsigned char*
code2kanji(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg);

unsigned char*
getkan_none(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {
	return d;
}

unsigned char*
getkan_hira(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {
	int cnt, csize;

	csize = codesize(*s);

	cnt = (*s & KanjiCodeMask) + 1;

	if(flg && (s[csize] == KanjiStrEnd)) ym += (yl - cnt) * 2;

	cnt *= 2;
	while(cnt-- > 0) *d++ = *ym++;

	return d;
}

unsigned char*
getkan_kata(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {
	int	      cnt, csize;
	unsigned char ch;

	csize = codesize(*s);

	cnt = (*s & KanjiCodeMask) + 1;

	if(flg && (s[csize] == KanjiStrEnd)) ym += (yl - cnt) * 2;

	while(cnt-- > 0) {

		if(*ym == 0xa4) {
			ch = *++ym;
			if(0xa1 <= ch && ch <= 0xf3) {
				*d++ = 0xa5;
			} else {
				*d++ = 0xa4;
			}
			*d++ = ch;
			ym++;
		} else {
			*d++ = *ym++;
			*d++ = *ym++;
		}
	}

	return d;
}

unsigned char*
getkan_knj(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {

	return code2kanji(askknj[*s & KnjAsshukuMask], d, ym, yl, flg);
}

unsigned char*
getkan_ofs(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {

	return code2kanji(dicbuf + ((*s & KanjiCodeMask) << 8) + *(s + 1),
			  d, ym, yl, flg);
}

unsigned char*
getkan_norm(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {
	unsigned char c;

	if(*s != 0) {
		c = s[1];
		if(c & 0x80)
			*d++ = SS3;
		*d++ = *s | 0x80;
		*d++ = c | 0x80;
	} else {
		*d++ = *s;
	}
	return d;
}

unsigned char*
getkan_ascii(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {
	unsigned char c;

	c = s[1];
	if(c & 0x80)
		*d++ = SS2;
	*d++ = c;

	return d;
}

static unsigned char*
code2kanji(unsigned char* s, unsigned char* d, unsigned char* ym, int yl, int flg) {
	int csize;

	for(;;) {
		csize = codesize(*s);
		if(s[csize] == KanjiStrEnd) {
			switch(*s & KanjiModeMask) {
			case ZenHiraAsshuku:
				d = getkan_hira(s, d, ym, yl, flg);
				break;

			case ZenKataAsshuku:
				d = getkan_kata(s, d, ym, yl, flg);
				break;

			case OffsetAsshuku:
				d = getkan_ofs(s, d, ym, yl, flg);
				break;

			case AiAttribute:
				d = getkan_none(s, d, ym, yl, flg);
				break;

			case LeadingHankaku:
				d = getkan_ascii(s, d, ym, yl, flg);
				break;

			case KanjiAsshuku:
				d = getkan_knj(s, d, ym, yl, flg);
				break;

			default:
				d = getkan_norm(s, d, ym, yl, flg);
			}
			break;
		} else
			switch(*s & KanjiModeMask) {
			case ZenHiraAsshuku:
				d = getkan_hira(s, d, ym, yl, FALSE);
				break;

			case ZenKataAsshuku:
				d = getkan_kata(s, d, ym, yl, FALSE);
				break;

			case OffsetAsshuku:
				d = getkan_ofs(s, d, ym, yl, FALSE);
				break;

			case AiAttribute:
				d = getkan_none(s, d, ym, yl, FALSE);
				break;

			case LeadingHankaku:
				d = getkan_ascii(s, d, ym, yl, FALSE);
				break;

			case KanjiAsshuku:
				d = getkan_knj(s, d, ym, yl, FALSE);
				break;

			default:
				d = getkan_norm(s, d, ym, yl, FALSE);
			}

		s += codesize(*s);
	}

	return d;
}

int getkanji(unsigned char* ym, int yl, unsigned char* ptr, unsigned char* buf) {
	unsigned char* q;

	q = code2kanji(ptr, buf, ym, yl, TRUE);

	return q - buf;
}