/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1996 by Sun Microsystems, Inc.
 */


#include <errno.h>
#include <stdlib.h>
#include "common_han.h"
#include "common_utf.h"
#include "common_njh.h"
#include "njh_utf_table.h"

static int node_compare(const void *node1, const void *node2)
{
        return(((int)(((const hcode_table *)node1)->code) -
                (int)(((const hcode_table *)node2)->code)));
}

/****  _ J O H A P 9 2 _ T O _ U T F 8  ****/

hcode_type _johap92_to_utf8(hcode_type njh_code)
{
        hcode_table *node_ptr, node;
        hcode_type utf_code;
        int     udc_index;

        /* User Definable Area Check */
        if (njh_code.byte.byte3 == NJH_UDC_SEG) {
                if ((njh_code.byte.byte4 < NJH_UDC_OFFSET1_START) ||
                    (NJH_UDC_OFFSET2_END < njh_code.byte.byte4) ||
                    ((NJH_UDC_OFFSET1_END < njh_code.byte.byte4) &&
                     (njh_code.byte.byte4 < NJH_UDC_OFFSET2_START))) {
                        /* beyond the UDC area */
                        utf_code.code = 0;

                        return(utf_code);
                }

                if (njh_code.byte.byte4 >= NJH_UDC_OFFSET2_START)
                        udc_index = NJH_UDC_OFFSET_GAP +
                                (int)(njh_code.byte.byte4 - NJH_UDC_OFFSET2_START);
                else
                        udc_index =
                                (int)(njh_code.byte.byte4 - NJH_UDC_OFFSET1_START);

                utf_code = _udcidx_to_utf(udc_index);

                if (utf_code.code == UTF_UDC_ERROR)
                        utf_code.code = UTF8_NON_ID_CHAR;       /* Failed */

                return(utf_code);

        } else if (njh_code.code > NJH_HANGUL_END) {
                /* Hanja or special symbol */
                /* Notes: if Hangul Jamo needed, add here to table coversion */

                node.code = njh_code.word.low;

                node_ptr = bsearch( &node,
                        njh2utf_tbl, sizeof(njh2utf_tbl)/sizeof(hcode_table),
                        sizeof(hcode_table), node_compare);

                if (node_ptr != NULL) /* Success */
                        return(node_ptr->utf8);
                else {                  /* Failed */
                        utf_code.code = UTF8_NON_ID_CHAR;
                        return(utf_code);
                }

        } else {
                /* Hangul code */
                hcode_type unicode;
                register unsigned int x, y, z;

                x = njh_code.johap.chosung - 2;  /* 2 = 'Kyoug' */
                y = njh_code.johap.joongsung;
                y = y < 0x08 ? y - 3 :
                        y < 0x10 ? y - 5 :
                        y < 0x18 ? y - 7 : y - 9;
                z = njh_code.johap.jongsung;
                z = z < 0x12 ? z - 1 : z - 2;
                unicode.code = (unsigned int)(x*588 + y*28 + z)
                                + 0xAC00;
                        /* 588 = 21(Joongsung Number) * 28(Jongsung Number) */

                utf_code = _uni_to_utf8(unicode);

                return(utf_code);

        }

}  /* end of hcode_type johap92_to_utf8(hcode_type njh_code) */