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/*
* 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) 2008, by Sun Microsystems, Inc.
* All rights reserved.
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#define __NEED_TCVN_2_VISCII__
#include <viscii_tcvn.h> /* VISCII <-> TCVN mapping table */
#include <vi_combine.h>
#include "common_defs.h"
#define NON_ID_CHAR '?' /* non-identified character */
typedef struct _icv_state {
int _errno; /* internal errno */
unsigned short last;
} _iconv_st;
static int binsearch(unsigned short x, Combine_map_tcvn v[], int n);
/*
* Open; called from iconv_open()
*/
void *
_icv_open()
{
_iconv_st *st;
if ((st = (_iconv_st *)malloc(sizeof(_iconv_st))) == NULL) {
errno = ENOMEM;
return ((void *) -1);
}
st->_errno = 0;
st->last = 0;
return ((void *) st);
}
/*
* Close; called from iconv_close()
*/
void
_icv_close(_iconv_st *st)
{
if (!st)
errno = EBADF;
else
free(st);
}
/*
* Actual conversion; called from iconv()
*/
size_t
_icv_iconv(_iconv_st *st, char **inbuf, size_t *inbytesleft,
char **outbuf, size_t *outbytesleft)
{
int unconv = 0;
int idx = -1;
unsigned char chout = 0;
#ifdef DEBUG
fprintf(stderr, "========== iconv(): TCVN5712 -->UCS-2 ==========\n");
#endif
if (st == NULL) {
errno = EBADF;
return ((size_t) -1);
}
if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
st->_errno = 0;
return ((size_t) 0);
}
st->_errno = 0; /* Reset internal errno */
errno = 0; /* Reset external errno */
/* Convert tcvn encoding to UCS-2 */
while (*inbytesleft > 0 && *outbytesleft > 0) {
unsigned char ch = 0;
if (st->last != 0) {
if (ISCOMB_TCVN((unsigned char)**inbuf)) {
/*
* Composed characters with combine character
*/
idx = binsearch(st->last, tcvn_comb_data, VOWEL_NUM);
if (idx >= 0) {
ch = tcvn_comb_data[idx].composed[(unsigned char)**inbuf - 0xb0];
} else {
errno = EBADF;
return ((size_t)-1);
}
st->last = 0;
} else {
tcvn_2_viscii(st->last, &chout);
if (st->last != 0x0 && chout == 0x0) {
unconv++;
chout = NON_ID_CHAR;
}
*(*outbuf)++ = chout;
(*outbytesleft) -= 1;
ch = (unsigned char)**inbuf;
}
st->last = 0;
} else {
ch = (unsigned char)**inbuf;
if (ch >= 0x41 && ch <= 0xad
&& ((tcvn_comp_bases_mask0[(ch-0x40) >> 5] >> (ch & 0x1f)) & 1)) {
/*
* uni is vowel, it's a possible match with combine character.
* Buffer it.
* */
st->last = ch;
(*inbuf)++;
(*inbytesleft)--;
continue;
}
}
tcvn_2_viscii(ch, &chout);
if (ch != 0x0 && chout == 0x0) {
unconv++;
chout = NON_ID_CHAR;
}
*(*outbuf)++ = chout;
(*outbytesleft) -= 1;
(*inbuf)++;
(*inbytesleft)--;
}
if ( *inbytesleft > 0 && *outbytesleft <= 0 ) {
errno = E2BIG;
st->last = 0;
return ((size_t)-1);
}
if (st->last != 0) {
tcvn_2_viscii(st->last, &chout);
if (**inbuf != 0x0 && chout == 0x0) {
unconv++;
chout = NON_ID_CHAR;
}
st->last = 0;
*(*outbuf)++ = chout;
(*outbytesleft) -= 1;
}
return ((size_t)unconv);
}
/* binsearch: find x in v[0] <= v[1] <= ... <= v[n-1] */
static int binsearch(unsigned short x, Combine_map_tcvn v[], int n)
{
int low = 0;
int mid = 0;
int high = n - 1;
low = 0;
while (low <= high) {
mid = (low + high) / 2;
if (x < (unsigned short)v[mid].base)
high = mid - 1;
else if (x > (unsigned short)v[mid].base)
low = mid + 1;
else
/* found match */
return mid;
}
/* no match */
return (-1);
}
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