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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) 1997, by Sun Microsystems, Inc.
* All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include "tab_lookup.h" /* table lookup data types */
#define MSB 0x80 /* most significant bit */
#define ONEBYTE 0xff /* right most byte */
enum _USTATE { U0, U1, U11, U2, U3, U4 };
/*
* Actual conversion; called from iconv()
* Input is UTF-8 data.
* first convert to UCS2
*/
size_t
_icv_iconv(_icv_state *st, char **inbuf, size_t *inbytesleft,
char **outbuf, size_t *outbytesleft)
{
/*
* Actual conversion; called from iconv()
*/
/*=========================================================
*
* State Machine for interpreting UTF8 code
*
*=========================================================
*
* 3 byte unicode
* +----->------->-------+
* | |
* ^ v
* | 2 byte U2 ---> U3
* | unicode v
* +------> U0 -------> U1 +-------->U4---+
* ^ ascii | | ^ |
* | | +-------->--------->--------+ |
* | v v
* +----<---+-----<------------<------------<------------+
*
* +----<---+-----<------------<------------<------------+
*
*=========================================================*/
char c1, c2;
int n, unidx;
unsigned long ibm_code;
#ifdef DEBUG
fprintf(stderr, "========== iconv(): UTF8 --> IBM ==========\n");
#endif
if (st == NULL) {
errno = EBADF;
return ((size_t) -1);
}
if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
st->ustate = U0;
st->_errno = 0;
return ((size_t) 0);
}
st->_errno = 0; /* reset internal errno */
errno = 0; /* reset external errno */
/* a state machine for interpreting UTF8 code */
while (*inbytesleft > 0 && *outbytesleft > 0) {
switch (st->ustate) {
case U0: /* assuming ASCII in the beginning */
if ((**inbuf & MSB) == 0) { /* ASCII */
**outbuf = **inbuf;
(*outbuf)++;
(*outbytesleft)--;
} else { /* Chinese character */
if ((**inbuf & 0xe0) == 0xc0) { /* 2 byte unicode */
st->ustate = U1;
st->keepc[0] = **inbuf;
} else if ((**inbuf & 0xf0) == 0xe0) { /* 3 byte */
st->ustate = U2;
st->keepc[0] = **inbuf;
} else { /* illegal unicode */
/* st->_errno = errno = EINVAL; */
/* possible UNICODE ko_KR-UTF8 */
c1 =st->keepc[0] = **inbuf;
st->ustate = U11;
break;
}
}
break;
case U1: /* 2 byte unicode */
if ((**inbuf & 0xc0) == MSB) {
st->ustate = U4;
st->keepc[1] = **inbuf;
c1 = (st->keepc[0]&0x1c)>>2;
c2 = ((st->keepc[0]&0x03)<<6) | ((**inbuf)&0x3f);
#ifdef DEBUG
fprintf(stderr, "UTF8: %02x%02x --> ",
st->keepc[0]&ONEBYTE, st->keepc[1]&ONEBYTE);
#endif
continue; /* should not advance *inbuf */
} else {
st->_errno = errno = EINVAL;
}
break;
case U11: /* 3 byte unicode - 2nd byte */
c2 =st->keepc[1] = **inbuf;
st->ustate = U4;
continue;
break;
case U2: /* 3 byte unicode - 2nd byte */
if ((**inbuf & 0xc0) == MSB) {
st->ustate = U3;
st->keepc[1] = **inbuf;
} else {
st->_errno = errno = EINVAL;
}
break;
case U3: /* 3 byte unicode - 3rd byte */
if ((**inbuf & 0xc0) == MSB) {
st->ustate = U4;
st->keepc[2] = **inbuf;
c1 = ((st->keepc[0]&0x0f)<<4) |
((st->keepc[1]&0x3c)>>2);
c2 = ((st->keepc[1]&0x03)<<6) | ((**inbuf)&0x3f);
#ifdef DEBUG
fprintf(stderr, "UTF8: %02x%02x%02x --> ", st->keepc[0]&ONEBYTE,
st->keepc[1]&ONEBYTE, **inbuf&ONEBYTE);
#endif
continue; /* should not advance *inbuf */
} else {
st->_errno = errno = EINVAL;
}
break;
case U4:
n = get_ibm_by_utf(st, c1, c2, &unidx, &ibm_code);
if (n != 0) { /* legal unicode;illegal Big5 */
st->_errno = errno = EILSEQ;
break;
}
n = utf8_to_ibm(unidx, ibm_code,
*outbuf, *outbytesleft);
if (n > 0) {
(*outbuf) += n;
(*outbytesleft) -= n;
} else {
st->_errno = errno;
return((size_t)-1);
}
st->ustate = U0;
st->_errno = 0;
break;
default: /* should never come here */
st->_errno = errno = EILSEQ;
st->ustate = U0; /* reset state */
break;
}
(*inbuf)++;
(*inbytesleft)--;
if (st->_errno) {
#ifdef DEBUG
fprintf(stderr, "!!!!!\tst->_errno = %d\tst->ustate = %d\n",
st->_errno, st->ustate);
#endif
break;
}
if (errno)
return((size_t)-1);
}
if (*outbytesleft == 0) {
errno = E2BIG;
return((size_t)-1);
}
return (*inbytesleft);
}
/*
* Match IBM code by UTF8 code;
* Return: = 0 - match from Unicode to IBM found
* = 1 - match from Unicode to IBM NOT found
*
* Since binary search of the UTF8 to IBM table is necessary, might as well
* return index and IBM code matching to the unicode.
*/
int get_ibm_by_utf(st, c1, c2, unidx, ibm_code)
_icv_state *st;
char c1, c2;
int *unidx;
unsigned long *ibm_code;
{
unsigned long unicode;
unicode = (unsigned long) ((c1 & ONEBYTE) << 8) + (c2 & ONEBYTE);
*unidx = bisearch(unicode, st, st->table_size);
if ((*unidx) >= 0)
{
if ( st->left_to_right )
*ibm_code = st->table[*unidx].right_code;
else
*ibm_code = st->table[*unidx].left_code;
}
else
; /* match from UTF8 to IBM not found */
#ifdef DEBUG
fprintf(stderr, "Unicode=%04x, idx=%5d, IBM=%x ", unicode, *unidx, *ibm_code);
#endif
return(0);
}
/*
* ISO/IEC 10646 (Unicode) --> IBM
* Unicode --> UTF8 (FSS-UTF)
* (File System Safe Universal Character Set Transformation Format)
* Return: > 0 - converted with enough space in output buffer
* = 0 - no space in outbuf
*/
int utf8_to_ibm(unidx, ibm_code, buf, buflen)
int unidx;
unsigned long ibm_code;
char *buf;
size_t buflen;
{
unsigned long val; /* IBM value */
char c1, c2, ibm_str[3];
if (unidx < 0) /* no match from UTF8 to IBM */
ibm_code = (unsigned long)NON_ID_CHAR;
{
val = ibm_code & 0xffff;
c1 = (char) ((val & 0xff00) >> 8);
c2 = (char) (val & 0xff);
}
*buf = ibm_str[0] = c1;
*(buf+1) = ibm_str[1] = c2;
ibm_str[2] = NULL;
#ifdef DEBUG
fprintf(stderr, "\t->%x %x<-\n", *buf, *(buf+1));
#endif
if (buflen < 2) {
errno = E2BIG;
return(0);
}
return(2);
}
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