/*
 * 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 AND PERMISSION NOTICE
 *
 * Copyright (c) 1991-2005 Unicode, Inc. All rights reserved. Distributed
 * under the Terms of Use in http://www.unicode.org/copyright.html.
 *
 * This file has been modified by Sun Microsystems, Inc.
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <euc.h>

#include "japanese.h"
#include "jfp_iconv_unicode.h"

#ifdef JAVA_CONV_COMPAT
#define JFP_U2E_ICONV_JAVA
#elif   JFP_ICONV_MS932
#define JFP_U2E_ICONV_MS932
#else
#define JFP_U2E_ICONV
#endif
#include "jfp_ucs2_to_euc16.h"

#define DEF_SINGLE      '?'

static unsigned short lookuptbl(unsigned short);

void *
_icv_open(void)
{
        return (_icv_open_unicode((size_t)0));
}

void
_icv_close(void *cd)
{
        _icv_close_unicode(cd);
        return;
}

size_t
_icv_iconv(void *cd, char **inbuf, size_t *inbytesleft,
                                char **outbuf, size_t *outbytesleft)
{
        unsigned char   ic;
        size_t          rv = (size_t)0;
        unsigned int    ucs4;
        unsigned short  euc16;
        unsigned short  dest;

        unsigned char   *ip;
        size_t          ileft;
        char            *op;
        size_t          oleft;

        /*
         * If inbuf and/or *inbuf are NULL, reset conversion descriptor
         * and put escape sequence if needed.
         */
        if ((inbuf == NULL) || (*inbuf == NULL)) {
                _icv_reset_unicode(cd);
                return ((size_t)0);
        }

        ip = (unsigned char *)*inbuf;
        ileft = *inbytesleft;
        op = *outbuf;
        oleft = *outbytesleft;

        while (ileft != 0) {
                GETU(&ucs4);

                if (ucs4 > 0xffff) {
                        /* non-BMP */
                        NPUT((unsigned char)DEF_SINGLE, "non-BMP(replaced)");
                } else {
                        euc16 = _jfp_ucs2_to_euc16((unsigned short)ucs4);

                        switch (euc16 & 0x8080) {
                        case 0x0000:    /* CS0 */
                                if (ISC1CTRL((unsigned char)euc16)) {
                                        NPUT((unsigned char)'?',
                                                "CS0-C1CTRL(replaced)")
                                } else {
                                        ic = (unsigned char)euc16;
                                        NPUT(ic, "CS0-1");
                                }
                                break;
                        case 0x8080:    /* CS1 */
                                ic = (unsigned short)((euc16 >> 8) & 0x7f);
                                NPUT(jis208tosj1[ic], "CS1-1");
                                /*
                                 * for even number row (Ku), add 0x80 to
                                 * look latter half of jistosj2[] array
                                 */
                                ic = (unsigned char)((euc16 & 0x7f)
                                        + (((ic % 2) == 0) ? 0x80 : 0x00));
                                NPUT(jistosj2[ic], "CS1-2");
                                break;
                        case 0x0080:    /* CS2 */
                                ic = (unsigned char)euc16;
                                NPUT(ic, "CS2-1");
                                break;
                        case 0x8000:    /* CS3 */
                                ic = (unsigned short)((euc16 >> 8) & 0x7f);
                                if (euc16 == 0xa271) {
                                        /* NUMERO SIGN */
                                        NPUT(0x87, "CS3-NUMERO-1");
                                        NPUT(0x82, "CS3-NUMERO-2");
                                } else if (ic < 0x75) { /* check if IBM VDC */
                                        dest = lookuptbl(euc16 & 0x7f7f);
                                        if (dest == 0xffff) {
                                                NPUT((unsigned char)'?',
                                                        "CS3-NoSJIS(replaced)")
                                        } else {
#ifdef  JAVA_CONV_COMPAT
                                                NPUT((unsigned char)'?',
                                                        "CS3-IBM(replaced)")
#else   /* !JAVA_CONV_COMPAT */
                                                /* avoid putting NUL ('\0') */
                                                if (dest > 0xff) {
                                                        NPUT((dest >> 8) & 0xff,
                                                                "CS3-IBM-1");
                                                        NPUT(dest & 0xff,
                                                                "CS3-IBM-2");
                                                } else {
                                                        NPUT(dest & 0xff,
                                                                "CS3-IBM-1");
                                                }
#endif  /* JAVA_CONV_COMPAT */
                                        }
                                } else {
                                        NPUT(jis212tosj1[ic], "CS3-1");
                                        /*
                                         * for even number row (Ku), add 0x80 to
                                         * look latter half of jistosj2[] array
                                         */
                                        ic = (unsigned short)((euc16 & 0x7f)
                                                + (((ic % 2) == 0) ?
                                                0x80 : 0x00));
                                        NPUT(jistosj2[ic], "CS3-2");
                                }
                                break;
                        }
                }

next:
                /*
                 * One character successfully converted so update
                 * values outside of this function's stack.
                 */
                *inbuf = (char *)ip;
                *inbytesleft = ileft;
                *outbuf = op;
                *outbytesleft = oleft;
        }

ret:

#if     defined(DEBUG)
        if (rv == (size_t)-1) {
                fprintf(stderr, "DEBUG: errno=%d: %s\n", errno, debugmsg);
        }
#endif  /* DEBUG */

        /*
         * Return value for successful return is not defined by XPG
         * so return same as *inbytesleft as existing codes do.
         */
        return ((rv == (size_t)-1) ? rv : *inbytesleft);
}

/*
 * lookuptbl()
 * Return the index number if its index-ed number
 * is the same as dest value.
 */
static unsigned short
lookuptbl(unsigned short dest)
{
        unsigned short tmp;
        int i;
        int sz = (sizeof (sjtoibmext) / sizeof (sjtoibmext[0]));

        for (i = 0; i < sz; i++) {
                tmp = (sjtoibmext[i] & 0x7f7f);
                if (tmp == dest)
                        return ((i + 0xfa40 + ((i / 0xc0) * 0x40)));
        }
        return (0x3f);
}