/*
 * 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 <stdlib.h>
#include <errno.h>
#include <euc.h>
#include "japanese.h"
#include "jfp_iconv_unicode.h"

#ifdef JAVA_CONV_COMPAT
#define JFP_J2U_ICONV_JAVA
#elif   JFP_ICONV_MS932
#define JFP_J2U_ICONV_MS932
#else
#define JFP_J2U_ICONV
#endif
#include "jfp_jis_to_ucs2.h"

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 int    uni;            /* UTF-32 */
        unsigned int    index;          /* index for table lookup */
        unsigned char   ic1, ic2;       /* 1st and 2nd bytes of a char */
        size_t          rv = (size_t)0; /* return value of this function */

        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) {
                NGET(ic1, "never fail here"); /* get 1st byte */

                if (ISASC((int)ic1)) {  /* ASCII; 1 byte */
                        uni = _jfp_tbl_jisx0201roman_to_ucs2[ic1];
                        PUTU(uni, "ASCII");
                } else if (ISSJKANA(ic1)) { /* JIS X 0201 Kana; 1 byte */
                        uni = _jfp_tbl_jisx0201kana_to_ucs2[(ic1 - 0xa1)];
                        PUTU(uni, "KANA");
                } else if (ISSJKANJI1(ic1)) { /* JIS X 0208 or UDC; 2 bytes */
                        NGET(ic2, "CS1-2 not available");
                        if (ISSJKANJI2(ic2)) {
                                ic1 = sjtojis1[(ic1 - 0x80)];
                                if (ic2 >= 0x9f) {
                                        ic1++;
                                }
                                index = ((ic1 - 0x21) * 94)
                                        + (sjtojis2[ic2] - 0x21);
                                uni = _jfp_tbl_jisx0208_to_ucs2[index];
                                PUTU(uni, "KANJI");
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "EILSEQ at CS1-2")
                                /* NOTREACHED */
                        }
                } else if (ISSJSUPKANJI1(ic1)) { /* VDC, 2 bytes */
                        NGET(ic2, "SUP-2 not available");
                        if (ISSJKANJI2(ic2)) {
                                ic1 = sjtojis1[(ic1 - 0x80)];
                                if (ic2 >= 0x9f) {
                                        ic1++;
                                }
                                index = ((ic1 - 0x21) * 94)
                                                + (sjtojis2[ic2] - 0x21);
                                uni = _jfp_tbl_jisx0212_to_ucs2[index];
                                PUTU(uni, "SUPKANJI");
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "EILSEQ at CS1-2")
                        }
                } else if (ISSJIBM(ic1) || /* Extended IBM char. area */
                        ISSJNECIBM(ic1)) { /* NEC/IBM char. area */
                        /*
                         * We need a special treatment for each codes.
                         * By adding some offset number for them, we
                         * can process them as the same way of that of
                         * extended IBM chars.
                         */
                        NGET(ic2, "IBM-2 not available");
                        if (ISSJKANJI2(ic2)) {
                                unsigned short dest, upper, lower;
                                dest = (ic1 << 8) + ic2;
                                if ((0xed40 <= dest) && (dest <= 0xeffc)) {
                                        REMAP_NEC(dest);
                                        if (dest == 0xffff) {
                                                RETERROR(EILSEQ, "invalid NEC")
                                        }
                                }
                                /*
                                 * XXX: 0xfa54 and 0xfa5b must be mapped
                                 *      to JIS0208 area. Therefore we
                                 *      have to do special treatment.
                                 */
                                if ((dest == 0xfa54) || (dest == 0xfa5b)) {
                                        if (dest == 0xfa54) {
                        /* map to JIS X 0208 row 2 cell 44 "NOT SIGN" */
                                index = (2 - 1) * 94 + (44 - 1);
                                        } else {
                        /* map to JIS X 0208 row 2 cell 72 "BECAUSE" */
                                index = (2 - 1) * 94 + (72 - 1);
                                        }
                                        uni = _jfp_tbl_jisx0208_to_ucs2[index];
                                        PUTU(uni, "IBM");
                                } else {
                                        dest = dest - 0xfa40 -
                                                (((dest>>8) - 0xfa) * 0x40);
                                        dest = sjtoibmext[dest];
                                        if (dest == 0xffff) {
                                                RETERROR(EILSEQ, "invalid IBM")
                                        }
                                        upper = ((dest >> 8) & 0x7f) - 0x21;
                                        lower = (dest & 0x7f) - 0x21;
                                        index = (unsigned int)(upper * 94 +
                                                lower);
                                        uni = _jfp_tbl_jisx0212_to_ucs2[index];
                                        PUTU(uni, "IBM");
                                }
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "EILSEQ at IBM-2")
                        }
                } else if ((0xeb <= ic1) && (ic1 <= 0xec)) {
                /*
                 * Based on the draft convention of OSF-JVC CDEWG,
                 * characters in this area will be mapped to
                 * "CHIKAN-MOJI." (convertible character)
                 * We use U+FFFD in this case.
                 */
                        NGET(ic2, "GAP-2 not available");
                        if (ISSJKANJI2(ic2)) {
                                uni = 0xfffd;
                                PUTU(uni, "GAP");
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "EILSEQ at GAP-2")
                        }
                } else { /* 1st byte check failed */
                        RETERROR(EILSEQ, "EILSEQ at 1st")
                }

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

ret:
        DEBUGPRINTERROR

        /*
         * 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);
}