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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 */
int bisearch(unsigned long val, _icv_state *st, int n);
#define MSB 0x80 /* most significant bit */
#define MBYTE 0x8e /* multi-byte (4 byte character) */
#define PMASK 0xa0 /* plane number mask */
#define ONEBYTE 0xff /* right most byte */
/* non-identified character */
#define UTF8_NON_ID_CHAR1 0xEF
#define UTF8_NON_ID_CHAR2 0xBF
#define UTF8_NON_ID_CHAR3 0xBD
enum _USTATE { C0, C1, C2 };
int ibm_to_utf8(_icv_state *st, char *buf, size_t buflen);
/*
* 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()
*/
int n;
#ifdef DEBUG
fprintf(stderr, "========== iconv(): IBM --> UTF8 ==========\n");
#endif
if (st == NULL) {
errno = EBADF;
return ((size_t) -1);
}
if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
st->ustate = C0;
st->_errno = 0;
st->shift = SHIFT_IN;
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 (**inbuf) {
case SHIFT_OUT :
if (st->shift == SHIFT_IN) {
st->shift = SHIFT_OUT;
(*inbuf)++;
(*inbytesleft)--;
continue;
}
break;
case SHIFT_IN :
if (st->shift == SHIFT_OUT) {
st->shift = SHIFT_IN;
(*inbuf)++;
(*inbytesleft)--;
continue;
}
break;
}
switch (st->ustate) {
case C0 :
/* the input is ascii, single byte, convert it */
if (st->shift == SHIFT_IN) {
st->keepc[0] = 0x0;
st->keepc[1] = **inbuf;
st->ustate = C2;
continue;
}
/* two bytes character */
st->keepc[0] = (**inbuf);
st->ustate = C1;
break;
case C1 :
st->keepc[1] = (**inbuf);
st->ustate = C2;
continue;
case C2 :
n = ibm_to_utf8(st, *outbuf, *outbytesleft);
if (n > 0) {
(*outbuf) += n;
(*outbytesleft) -= n;
} else {
st->_errno = errno;
return((size_t)-1);
}
st->ustate = C0;
st->_errno = 0;
break;
default: /* should never come here */
st->_errno = errno = EILSEQ;
st->ustate = C0; /* 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);
}
/*
* IBM code --> (Unicode)
* 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 ibm_to_utf8(st, buf, buflen)
_icv_state *st;
char *buf;
size_t buflen;
{
unsigned long ibm_val; /* Big-5 value */
int unidx; /* Unicode index */
unsigned long uni_val; /* Unicode */
ibm_val = ((st->keepc[0]&ONEBYTE) << 8) + (st->keepc[1]&ONEBYTE);
#ifdef DEBUG
fprintf(stderr, "%x\t", ibm_val);
#endif
unidx = bisearch(ibm_val, st, st->table_size);
if (unidx >= 0)
{
if ( st->left_to_right )
uni_val = st->table[unidx].right_code;
else
uni_val = st->table[unidx].left_code;
}
#ifdef DEBUG
fprintf(stderr, "unidx = %d, unicode = %x\t", unidx, uni_val);
#endif
if (unidx >= 0) { /* do Unicode to UTF8 conversion */
if (uni_val <= 0x07f) {
if (buflen < 1) {
errno = E2BIG;
return 0;
}
*buf = uni_val;
return 1;
}
if (uni_val >= 0x0080 && uni_val <= 0x07ff) {
if (buflen < 2) {
#ifdef DEBUG
fprintf(stderr, "outbuf overflow in ibm_to_utf8()!!\n");
#endif
errno = E2BIG;
return(0);
}
*buf = (char)((uni_val >> 6) & 0x1f) | 0xc0;
*(buf+1) = (char)(uni_val & 0x3f) | 0x80;
#ifdef DEBUG
fprintf(stderr, "%x %x\n", *buf&ONEBYTE, *(buf+1)&ONEBYTE);
#endif
return(2);
}
if (uni_val >= 0x0800 && uni_val <= 0xffff) {
if (buflen < 3) {
#ifdef DEBUG
fprintf(stderr, "outbuf overflow in ibm_to_utf8()!!\n");
#endif
errno = E2BIG;
return(0);
}
*buf = (char)((uni_val >> 12) & 0xf) | 0xe0;
*(buf+1) = (char)((uni_val >>6) & 0x3f) | 0x80;
*(buf+2) = (char)(uni_val & 0x3f) | 0x80;
#ifdef DEBUG
fprintf(stderr, "%x %x %x\n", *buf&ONEBYTE, *(buf+1)&ONEBYTE, *(buf+2)&ONEBYTE);
#endif
return(3);
}
}
/* can't find a match in IBM --> UTF8 table or illegal UTF8 code */
if (buflen < 3) {
#ifdef DEBUG
fprintf(stderr, "outbuf overflow in ibm_to_utf8()!!\n");
#endif
errno = E2BIG;
return(0);
}
*buf = (char)UTF8_NON_ID_CHAR1;
*(buf+1) = (char)UTF8_NON_ID_CHAR2;
*(buf+2) = (char)UTF8_NON_ID_CHAR3;
#ifdef DEBUG
fprintf(stderr, "%c %c %c\n", *buf, *(buf+1), *(buf+2));
#endif
return(3);
}
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