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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_UNI_2_VISCII__
#include <unicode_viscii.h> /* Unicode to viscii mapping table */
#include "common_defs.h"
#define MSB 0x80 /* most significant bit */
#define ONEBYTE 0xff /* right most byte */
#define NON_ID_CHAR '?' /* non-identified character */
typedef struct _icv_state {
char keepc[6]; /* maximum # byte of UTF8 code */
short ustate;
int _errno; /* internal errno */
} _iconv_st;
enum _USTATE { U0, U1, U2, U3, U4, U5, U6, U7 };
/*
* 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->ustate = U0;
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()
*/
/*=========================================================
*
* State Machine for interpreting UTF8 code
*
*=========================================================
* 4 byte unicode
* +----->------->------------> U5 -----> U6-------> U7---+
* | |
* | 3 byte unicode |
* +----->------->-------+ |
* | | |
* ^ v |
* | 2 byte U2 ---> U3 |
* | unicode v |
* +------> U0 -------> U1 +-------->U4---+ |
* ^ ascii | | ^ | |
* | | +-------->--------->--------+ | |
* | v v V
* +----<---+-----<------------<------------<------------+---------+
*
*=========================================================*/
size_t
_icv_iconv(_iconv_st *st, char **inbuf, size_t *inbytesleft,
char **outbuf, size_t *outbytesleft)
{
char c1 = '\0', c2 = '\0';
int uconv_num = 0;
unsigned long uni = 0;
int utf8_len = 0;
#ifdef DEBUG
fprintf(stderr, "========== iconv(): UTF2 --> GBK2K ==========\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) {
uchar_t first_byte;
unsigned short ch = 0;
switch (st->ustate) {
case U0:
/*
* assuming ASCII in the beginning
*/
if ((**inbuf & MSB) == 0) { /* ASCII */
**outbuf = **inbuf;
(*outbuf)++;
(*outbytesleft)--;
} else {
if ((**inbuf & 0xe0) == 0xc0) {
/* 2 byte unicode 0xc0..0xdf */
/* invalid sequence if the first char is either 0xc0 or 0xc1 */
if ( number_of_bytes_in_utf8_char[((uchar_t)**inbuf)] == ICV_TYPE_ILLEGAL_CHAR )
st->_errno = errno = EILSEQ;
else {
st->ustate = U1;
st->keepc[0] = **inbuf;
}
} else if ((**inbuf & 0xf0) == 0xe0) { /* 3 byte 0xe0..0xf0 */
st->ustate = U2;
st->keepc[0] = **inbuf;
} else {
/* four bytes of UTF-8 sequences */
if ( number_of_bytes_in_utf8_char[((uchar_t)**inbuf)] == ICV_TYPE_ILLEGAL_CHAR )
st->_errno = errno = EILSEQ;
else {
st->ustate = U5;
st->keepc[0] = **inbuf;
}
}
}
break;
case U1:
/* 2 byte utf-8 encoding */
if ((**inbuf & 0xc0) == MSB) {
utf8_len = 2;
st->keepc[1] = **inbuf;
c1 = (st->keepc[0]&0x1c)>>2;
c2 = ((st->keepc[0]&0x03)<<6) | ((st->keepc[1])&0x3f);
st->ustate = U4;
#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 = EILSEQ;
}
break;
case U2:
/* 3 byte unicode - 2nd byte */
first_byte = (uchar_t)st->keepc[0];
/* if the first byte is 0xed, it is illegal sequence if the second
* one is between 0xa0 and 0xbf because surrogate section is ill-formed
*/
if (((uchar_t)**inbuf) < valid_min_2nd_byte[first_byte] ||
((uchar_t)**inbuf) > valid_max_2nd_byte[first_byte] )
st->_errno = errno = EILSEQ;
else {
st->ustate = U3;
st->keepc[1] = **inbuf;
}
break;
case U3:
/* 3 byte unicode - 3rd byte */
if ((**inbuf & 0xc0) == MSB) {
st->ustate = U4;
utf8_len = 3;
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 = EILSEQ;
}
break;
case U4:
uni = (unsigned long) ((c1 & ONEBYTE) << 8) + (c2 & ONEBYTE);
if (!uni_2_viscii(uni, (unsigned char*)&ch)) {
**outbuf = NON_ID_CHAR;
uconv_num += utf8_len;
} else {
**outbuf = ch;
}
(*outbuf)++;
(*outbytesleft)--;
st->ustate = U0;
break;
case U5:
first_byte = st->keepc[0];
/* if the first byte is 0xf0, it is illegal sequence if
* the second one is between 0x80 and 0x8f
* for Four-Byte UTF: U+10000..U+10FFFF
* */
if (((uchar_t)**inbuf) < valid_min_2nd_byte[first_byte] ||
((uchar_t)**inbuf) > valid_max_2nd_byte[first_byte] )
st->_errno = errno = EILSEQ;
else {
st->ustate = U6;
st->keepc[1] = **inbuf;
}
break;
case U6:
if ((**inbuf & 0xc0) == MSB) {
/* 0x80..0xbf */
st->ustate = U7;
st->keepc[2] = **inbuf;
} else
st->_errno = errno = EILSEQ;
break;
case U7:
if ((**inbuf & 0xc0) == MSB) {
/* 0x80..0xbf */
/* replace with double NON_ID_CHARs */
if ( *outbytesleft < 1 )
st->_errno = errno = E2BIG;
else {
**outbuf = NON_ID_CHAR;
(*outbytesleft) -= 1;
uconv_num++;
st->ustate = U0;
}
} else
st->_errno = errno = EILSEQ;
break;
default:
/* should never come here */
st->_errno = errno = EILSEQ;
st->ustate = U0; /* reset state */
break;
}
if (st->_errno) {
#ifdef DEBUG
fprintf(stderr, "!!!!!\tst->_errno = %d\tst->ustate = %d\n",
st->_errno, st->ustate);
#endif
break;
}
(*inbuf)++;
(*inbytesleft)--;
}
if (*inbytesleft == 0 && st->ustate != U0)
errno = EINVAL;
if (*inbytesleft > 0 && *outbytesleft == 0)
errno = E2BIG;
if (errno) {
int num_reversed_bytes = 0;
switch (st->ustate)
{
case U1:
num_reversed_bytes = 1;
break;
case U2:
num_reversed_bytes = 1;
break;
case U3:
num_reversed_bytes = 2;
break;
case U4:
num_reversed_bytes = utf8_len - 1;
break;
case U5:
num_reversed_bytes = 1;
break;
case U6:
num_reversed_bytes = 2;
break;
case U7:
num_reversed_bytes = 3;
break;
}
/*
* if error, *inbuf points to the byte following the last byte
* successfully used in conversion.
*/
*inbuf -= num_reversed_bytes;
*inbytesleft += num_reversed_bytes;
st->ustate = U0;
return ((size_t) -1);
}
return uconv_num;
}
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