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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) 2001 Sun Microsystems, Inc.
* All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <big5hk_big5p.h>
#define NON_ID_CHAR '_' /* non-identifier charactor */
#define MSB 0x80
#define ONEBYTE 0xff
#define gbk_4th_byte(v) ( ((v) >= 0x30) && ((v) <= 0x39) )
typedef struct _icv_state {
char keepc[2]; /* maximum # byte of HKSCS charactor */
short cstate;
int _errno; /* internal errno */
} _iconv_st;
enum _CSTATE { C0, C1 };
int hkscs_2nd_byte(char inbuf);
int hkscs_to_big5p(char keepc[], char *buf, size_t buflen);
int binsearch(unsigned long x, table_t table[], 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->cstate = C0;
st->_errno = 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 n;
if (st == NULL) {
errno = EBADF;
return ((size_t) -1);
}
if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
st->cstate = C0;
st->_errno = 0;
return ((size_t) 0);
}
errno = st->_errno = 0;
while (*inbytesleft > 0 && *outbytesleft > 0) {
switch (st->cstate) {
case C0:
if (**inbuf & MSB) { /* hkscs charactor */
st->keepc[0] = (**inbuf);
st->cstate = C1;
} else { /* ASCII */
**outbuf = **inbuf;
(*outbuf)++;
(*outbytesleft)--;
}
break;
case C1: /* hkscs charactor 2nd byte */
if (hkscs_2nd_byte(**inbuf) == 0) {
st->keepc[1] = (**inbuf);
n = hkscs_to_big5p(st->keepc, *outbuf, *outbytesleft);
if (n > 0) {
(*outbuf) += n;
(*outbytesleft) -= n;
st->cstate = C0;
} else {
st->_errno = errno = E2BIG;
}
} else { /* illegal input */
st->_errno = errno =EILSEQ;
}
break;
default:
st->_errno = errno = EILSEQ;
st->cstate = C0;
break;
}
if (st->_errno)
break;
(*inbuf) ++;
(*inbytesleft)--;
}
if (errno) return ((size_t) -1);
if (*inbytesleft == 0 && st->cstate != C0) {
errno = EINVAL;
return ((size_t) -1);
}
if (*inbytesleft > 0 && *outbytesleft == 0) {
errno = E2BIG;
return (size_t)-1;
}
return (size_t)(*inbytesleft);
}
/*
* Test whether inbuf is a valid character for
* 2nd byte of HKSCS charactor:
* Return: 0 --- valid HKSCS 2nd byte
* 1 --- invalid HKSCS 2nd byte
*/
int hkscs_2nd_byte(inbuf)
char inbuf;
{
unsigned int buf = (unsigned int)(inbuf & ONEBYTE);
if ((buf >= 0x40) && (buf <= 0xfe))
return 0;
return 1;
}
/*
* hkscs_to_big5p: Convert hkscs to big5p.
* Return: >0 --- converted with enough space in output buffer
* =0 --- no space in outbuf
*/
int hkscs_to_big5p(char keepc[], char *buf, size_t buflen) {
unsigned long gbk_val;
int index;
unsigned long hkscs_val;
if (buflen < 2) {
errno = E2BIG;
return 0;
}
hkscs_val = ((keepc[0] & ONEBYTE) << 8) + (keepc[1] & ONEBYTE);
index = binsearch(hkscs_val, hkscs_big5p_tab, HKSCSMAX);
if (index >= 0) {
gbk_val = hkscs_big5p_tab[index].value;
*buf = (gbk_val >> 8) & ONEBYTE;
*(buf + 1) = gbk_val & ONEBYTE;
} else
*buf = *(buf + 1) = (char)NON_ID_CHAR;
return 2;
}
/*
* binsearch()
*/
int binsearch(unsigned long x, table_t table[], int n) {
int low, high, mid;
low = 0;
high = n - 1;
while (low <= high) {
mid = (low + high) >> 1;
if (x < table[mid].key)
high = mid - 1;
else if (x > table[mid].key)
low = mid + 1;
else
return mid;
}
return -1;
}
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