blob: b1e8f5b7b1b674117ef772d82c264a2fd22d6445 [file] [log] [blame]
/*
* 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) 1997, by Sun Microsystems, Inc.
* All rights reserved.
*/
/*
Converts From: ISO2022-CN-EXT encoding.
Converts To: Taiwanese EUC encoding ( CNS11643 )
*/
#include "iso2022-cn.h"
#include "gb2312_cns11643.h"
/* Forward reference the functions constrained to the scope of this file */
static int chinese_to_euc( _iconv_st*, unsigned char**, size_t*, int);
static int gb_to_euc( _iconv_st *st, unsigned char **outbuf, size_t *outbytesleft);
extern int errno;
size_t
_icv_iconv(_iconv_st *st, char **inbuf, size_t *inbytesleft,
char **outbuf, size_t *outbytesleft)
{
return iso2022_icv_iconv(st, inbuf, inbytesleft, (unsigned char**) outbuf, outbytesleft,
chinese_to_euc);
}
static int
chinese_to_euc( _iconv_st *st, unsigned char **outbuf, size_t *outbytesleft, int plane_no )
{
if ( st->SSfunc == NULL && st->SOcharset == 'A') { /* GB2312 */
return gb_to_euc(st, outbuf, outbytesleft);
}
if ( plane_no < 0 )/* Not a CNS character */
return (1);
if ( plane_no >= 2) {
if ( *outbytesleft < 4 ){
st->_errno = errno = E2BIG;
return (-1);
}
/* Output the multi-byte code and plane number */
*(*outbuf)++ = (unsigned char) MBYTE;
*(*outbuf)++ = (unsigned char) (PMASK + plane_no);
(*outbytesleft) -= 2;
}
if ( *outbytesleft < 2 ){ /* Redundant test if SS2 or SS3 character */
st->_errno = errno = E2BIG;
return (-1);
}
*(*outbuf)++ = (unsigned char) (st->keepc[0] | MSB);
*(*outbuf)++ = (unsigned char) (st->keepc[1] | MSB);
(*outbytesleft) -= 2;
return (0);
}
static int make_cns(_iconv_st *st, unsigned long cnscode, unsigned char **outbuf, size_t *outbytesleft)
{
int plane_no, ret; /* return buffer size */
ret = (int) (cnscode >> 16);
switch (ret) {
case 0x21: /* 0x8EA1 - G */
case 0x22: /* 0x8EA2 - H */
case 0x23: /* 0x8EA3 - I */
case 0x24: /* 0x8EA4 - J */
case 0x25: /* 0x8EA5 - K */
case 0x26: /* 0x8EA6 - L */
case 0x27: /* 0x8EA7 - M */
case 0x28: /* 0x8EA8 - N */
case 0x29: /* 0x8EA9 - O */
case 0x2a: /* 0x8EAA - P */
case 0x2b: /* 0x8EAB - Q */
case 0x2c: /* 0x8EAC - R */
case 0x2d: /* 0x8EAD - S */
case 0x2f: /* 0x8EAF - U */
case 0x30: /* 0x8EB0 - V */
plane_no = ret - 0x20;
break;
case 0x2e: /* 0x8EAE - T */
plane_no = 3; /* CNS 11643-1992 */
break;
default:
st->_errno = errno = EILSEQ;
return (0);
}
if ( plane_no >= 2) {
if ( *outbytesleft < 4 ){
st->_errno = errno = E2BIG;
return (-1);
}
/* Output the multi-byte code and plane number */
*(*outbuf)++ = (unsigned char) MBYTE;
*(*outbuf)++ = (unsigned char) (PMASK + plane_no);
(*outbytesleft) -= 2;
}
if ( *outbytesleft < 2 ){ /* Redundant test if SS2 or SS3 character */
st->_errno = errno = E2BIG;
return (-1);
}
*(*outbuf)++ = (unsigned char) (((cnscode >> 8) & 0xff) | MSB);
*(*outbuf)++ = (unsigned char) ((cnscode & 0xff) | MSB);
(*outbytesleft) -= 2;
return (0);
}
static int
gb_cns_comp(const void *p1, const void *p2)
{
gb_cns *ptr1 = (gb_cns*) p1, *ptr2 = (gb_cns*) p2;
long result = ptr1->gbcode - ptr2->gbcode;
return result == 0 ? 0 : result > 0 ? 1 : -1;
}
static int
gb_to_euc( _iconv_st *st, unsigned char **outbuf, size_t *outbytesleft )
{
gb_cns *ptr, key;
key.gbcode = (unsigned long) ((st->keepc[0] | MSB) << 8) + (st->keepc[1] | MSB);
ptr = (gb_cns*) bsearch(&key, gb_cns_tab, BIG5MAX, sizeof(gb_cns), gb_cns_comp);
if ( ptr && ptr->cnscode > 0 )
return make_cns(st, ptr->cnscode, outbuf, outbytesleft);
else
return (1);
}