/*
 * 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) 1994 by Sun Microsystems, Inc.
 */


#include <stdlib.h>
#include <errno.h>
#include "ktable.h"
#include "hangulcode.h"


/****  _ I C V _ O P E N  ****/

void* _icv_open()
{
        int*    cd = (int*)malloc(sizeof(int));

        if (cd == (int*)NULL)
        {
                errno = ENOMEM;
                return((void*)-1);
        }

        *cd = MAGIC_NUMBER;

        return((void*)cd);
}  /* end of int _icv_open(). */


/****  _ I C V _ C L O S E  ****/

void _icv_close(int* cd)
{
        if (!cd)
                errno = EBADF;
        else
                free((void*)cd);
}  /* end of void _icv_close(int*). */


/****  _ I C V _ I C O N V  ****/

size_t _icv_iconv(int* cd, char** inbuf, size_t* inbufleft,
                        char** outbuf, size_t* outbufleft)
{
        size_t          ret_val = 0;
        unsigned char*  ib;
        unsigned char*  ob;
        unsigned char*  ibtail;
        unsigned char*  obtail;

        if (!cd || (*cd) != MAGIC_NUMBER)
        {
                errno = EBADF;
                return((size_t)-1);
        }

        if (!inbuf || !(*inbuf))
                return((size_t)0);

        ib = (unsigned char*)*inbuf;
        ob = (unsigned char*)*outbuf;
        ibtail = ib + *inbufleft;
        obtail = ob + *outbufleft;

        while (ib < ibtail)
        {
                if (*ib & 0x80)
                {
                        unsigned short  wcode;
                        unsigned long   ci, v, cf;
                        char            result;
                        extern char     _johap_to_utf8(unsigned long*,
                                                unsigned long*,
                                                unsigned long*,
                                                unsigned short);

                        if ((ibtail - ib) < 2)
                        {
                                errno = EINVAL;
                                ret_val = (size_t)-1;
                                break;
                        }

                        if ((result = _johap_to_utf8(&ci, &v, &cf,
                                        ((unsigned short)*ib << 8) |
                                        ((unsigned short)*(ib + 1) & 0xFF)))
                            == HANGUL)
                        {
                                if ((obtail - ob) < (cf ? 9 : 6))
                                {
                                        errno = E2BIG;
                                        ret_val = (size_t)-1;
                                        break;
                                }
                                *ob++ = (char)((ci >> 16) & 0xFF);
                                *ob++ = (char)((ci >> 8) & 0xFF);
                                *ob++ = (char)(ci & 0xFF);
                                *ob++ = (char)((v >> 16) & 0xFF);
                                *ob++ = (char)((v >> 8) & 0xFF);
                                *ob++ = (char)(v & 0xFF);
                                if (cf)
                                {
                                        *ob++ = (char)((cf >> 16) & 0xFF);
                                        *ob++ = (char)((cf >> 8) & 0xFF);
                                        *ob++ = (char)(cf & 0xFF);
                                }
                        }
                        else  /* FAILED - this means input char isn't belong to
                               *          input codeset. */
                        {
                                errno = EILSEQ;
                                ret_val = (size_t)-1;
                                break;
                        }
                        ib += 2;

                }
                else  /* CS0 */
                {
                        if (ob >= obtail)
                        {
                                errno = E2BIG;
                                ret_val = (size_t)-1;
                                break;
                        }
                        *ob++ = *ib++;
                }
        }

        *inbuf = (char*)ib;
        *inbufleft = ibtail - ib;
        *outbuf = (char*)ob;
        *outbufleft = obtail - ob;

        return(ret_val);
}  /* end of size_t _icv_iconv(_conv_desc*, char**, size_t*, char**, size_t*).*/