/*
 * 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 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"

#define JFP_J2U_ICONV_X0213
#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    u32;            /* UTF-32 */
        unsigned short  e16;            /* 16-bit EUC */
        unsigned char   ic1, ic2, ic3;  /* 1st, 2nd, and 3rd 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(ic1)) { /* CS0; 1 byte */
                        u32 = (unsigned int)_jfp_tbl_jisx0201roman_to_ucs2[ic1];
                        PUTU(u32, "CS0");
                } else if (ISCS1(ic1)) { /* JIS X 0213 plane 1; 2 bytes */
                        NGET(ic2, "CS1-2");
                        if (ISCS1(ic2)) { /* 2nd byte check passed */
                                e16 = (ic1 << 8) | ic2;
                                u32 = (unsigned int)_jfp_tbl_jisx0208_to_ucs2[
                                        (ic1 - 0xa1) * 94 + (ic2 - 0xa1)];
                                if (IFHISUR(u32)) {
                                        u32 = _jfp_lookup_x0213_nonbmp(
                                                e16, u32);
                                        PUTU(u32, "CS1->NONBMP");
                                } else if (u32 == 0xffff) {
                                        /* need to compose */
                                        unsigned int    u32_2;
                                        u32 = _jfp_lookup_x0213_compose(
                                                e16, &u32_2);
                                        PUTU(u32, "CS1->CP1");
                                        PUTU(u32_2, "CS1->CP2");
                                } else {
                                        PUTU(u32, "CS1->BMP");
                                }
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "CS1-2")
                        }
                } else if (ic1 == SS2) { /* JIS X 0201 Kana; 2 bytes */
                        NGET(ic2, "CS2-2");
                        if (ISCS2(ic2)) { /* 2nd byte check passed */
                                u32 = (unsigned int)
                                _jfp_tbl_jisx0201kana_to_ucs2[ic2 - 0xa1];
                                PUTU(u32, "CS2->Kana");
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "CS2-2")
                        }
                } else if (ic1 == SS3) { /* JIS X 0213 plane 2; 3 bytes */
                        NGET(ic2, "CS3-2");
                        if (ISCS3(ic2)) { /* 2nd byte check passed */
                                NGET(ic3, "CS3-3");
                                if (ISCS3(ic3)) { /* 3rd byte check passed */
                                        e16 = (ic2 << 8) | (ic3 & 0x7f);
                                        u32 = (unsigned int)
                                        _jfp_tbl_jisx0213p2_to_ucs2[
                                        (ic2 - 0xa1) * 94 + (ic3 - 0xa1)];
                                        if (IFHISUR(u32)) {
                                                u32 = _jfp_lookup_x0213_nonbmp(
                                                e16, u32);
                                                PUTU(u32, "CS3->NONBMP");
                                        } else {
                                                PUTU(u32, "CS3->BMP");
                                        }
                                } else { /* 3rd byte check failed */
                                        RETERROR(EILSEQ, "CS3-3")
                                }
                        } else { /* 2nd byte check failed */
                                RETERROR(EILSEQ, "CS3-2")
                        }
                } else if (ISC1CTRLEUC(ic1)) { /* C1 control; 1 byte */
                        u32 = ic1;
                        PUTU(u32, "E2BIG C1CTRL");
                } else { /* 1st byte check failed */
                        RETERROR(EILSEQ, "CS?-1")
                }

                /*
                 * 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);
}