/* $FreeBSD$ */
/* $NetBSD: citrus_dechanyu.c,v 1.4 2011/11/19 18:20:13 tnozaki Exp $ */
/*-
* Copyright (c)2007 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_module.h"
#include "citrus_stdenc.h"
#include "citrus_dechanyu.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
typedef struct {
size_t chlen;
char ch[4];
} _DECHanyuState;
typedef struct {
int dummy;
} _DECHanyuEncodingInfo;
#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.__CONCAT(s_,_func_)
#define _FUNCNAME(m) __CONCAT(_citrus_DECHanyu_,m)
#define _ENCODING_INFO _DECHanyuEncodingInfo
#define _ENCODING_STATE _DECHanyuState
#define _ENCODING_MB_CUR_MAX(_ei_) 4
#define _ENCODING_IS_STATE_DEPENDENT 0
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
/*ARGSUSED*/
_citrus_DECHanyu_init_state(_DECHanyuEncodingInfo * __restrict ei __unused,
_DECHanyuState * __restrict psenc)
{
psenc->chlen = 0;
}
#if 0
static __inline void
/*ARGSUSED*/
_citrus_DECHanyu_pack_state(_DECHanyuEncodingInfo * __restrict ei __unused,
void * __restrict pspriv, const _DECHanyuState * __restrict psenc)
{
memcpy(pspriv, (const void *)psenc, sizeof(*psenc));
}
static __inline void
/*ARGSUSED*/
_citrus_DECHanyu_unpack_state(_DECHanyuEncodingInfo * __restrict ei __unused,
_DECHanyuState * __restrict psenc,
const void * __restrict pspriv)
{
memcpy((void *)psenc, pspriv, sizeof(*psenc));
}
#endif
static void
/*ARGSUSED*/
_citrus_DECHanyu_encoding_module_uninit(_DECHanyuEncodingInfo *ei __unused)
{
/* ei may be null */
}
static int
/*ARGSUSED*/
_citrus_DECHanyu_encoding_module_init(_DECHanyuEncodingInfo * __restrict ei __unused,
const void * __restrict var __unused, size_t lenvar __unused)
{
/* ei may be null */
return (0);
}
static __inline bool
is_singlebyte(int c)
{
return (c <= 0x7F);
}
static __inline bool
is_leadbyte(int c)
{
return (c >= 0xA1 && c <= 0xFE);
}
static __inline bool
is_trailbyte(int c)
{
c &= ~0x80;
return (c >= 0x21 && c <= 0x7E);
}
static __inline bool
is_hanyu1(int c)
{
return (c == 0xC2);
}
static __inline bool
is_hanyu2(int c)
{
return (c == 0xCB);
}
#define HANYUBIT 0xC2CB0000
static __inline bool
is_94charset(int c)
{
return (c >= 0x21 && c <= 0x7E);
}
static int
/*ARGSUSED*/
_citrus_DECHanyu_mbrtowc_priv(_DECHanyuEncodingInfo * __restrict ei,
wchar_t * __restrict pwc, char ** __restrict s, size_t n,
_DECHanyuState * __restrict psenc, size_t * __restrict nresult)
{
char *s0;
wchar_t wc;
int ch;
if (*s == NULL) {
_citrus_DECHanyu_init_state(ei, psenc);
*nresult = _ENCODING_IS_STATE_DEPENDENT;
return (0);
}
s0 = *s;
wc = (wchar_t)0;
switch (psenc->chlen) {
case 0:
if (n-- < 1)
goto restart;
ch = *s0++ & 0xFF;
if (is_singlebyte(ch)) {
if (pwc != NULL)
*pwc = (wchar_t)ch;
*nresult = (size_t)((ch == 0) ? 0 : 1);
*s = s0;
return (0);
}
if (!is_leadbyte(ch))
goto ilseq;
psenc->ch[psenc->chlen++] = ch;
break;
case 1:
ch = psenc->ch[0] & 0xFF;
if (!is_leadbyte(ch))
return (EINVAL);
break;
case 2: case 3:
ch = psenc->ch[0] & 0xFF;
if (is_hanyu1(ch)) {
ch = psenc->ch[1] & 0xFF;
if (is_hanyu2(ch)) {
wc |= (wchar_t)HANYUBIT;
break;
}
}
/*FALLTHROUGH*/
default:
return (EINVAL);
}
switch (psenc->chlen) {
case 1:
if (is_hanyu1(ch)) {
if (n-- < 1)
goto restart;
ch = *s0++ & 0xFF;
if (!is_hanyu2(ch))
goto ilseq;
psenc->ch[psenc->chlen++] = ch;
wc |= (wchar_t)HANYUBIT;
if (n-- < 1)
goto restart;
ch = *s0++ & 0xFF;
if (!is_leadbyte(ch))
goto ilseq;
psenc->ch[psenc->chlen++] = ch;
}
break;
case 2:
if (n-- < 1)
goto restart;
ch = *s0++ & 0xFF;
if (!is_leadbyte(ch))
goto ilseq;
psenc->ch[psenc->chlen++] = ch;
break;
case 3:
ch = psenc->ch[2] & 0xFF;
if (!is_leadbyte(ch))
return (EINVAL);
}
if (n-- < 1)
goto restart;
wc |= (wchar_t)(ch << 8);
ch = *s0++ & 0xFF;
if (!is_trailbyte(ch))
goto ilseq;
wc |= (wchar_t)ch;
if (pwc != NULL)
*pwc = wc;
*nresult = (size_t)(s0 - *s);
*s = s0;
psenc->chlen = 0;
return (0);
restart:
*nresult = (size_t)-2;
*s = s0;
return (0);
ilseq:
*nresult = (size_t)-1;
return (EILSEQ);
}
static int
/*ARGSUSED*/
_citrus_DECHanyu_wcrtomb_priv(_DECHanyuEncodingInfo * __restrict ei __unused,
char * __restrict s, size_t n, wchar_t wc,
_DECHanyuState * __restrict psenc, size_t * __restrict nresult)
{
int ch;
if (psenc->chlen != 0)
return (EINVAL);
/* XXX: assume wchar_t as int */
if ((uint32_t)wc <= 0x7F) {
ch = wc & 0xFF;
} else {
if ((uint32_t)wc > 0xFFFF) {
if ((wc & ~0xFFFF) != (wchar_t)HANYUBIT)
goto ilseq;
psenc->ch[psenc->chlen++] = (wc >> 24) & 0xFF;
psenc->ch[psenc->chlen++] = (wc >> 16) & 0xFF;
wc &= 0xFFFF;
}
ch = (wc >> 8) & 0xFF;
if (!is_leadbyte(ch))
goto ilseq;
psenc->ch[psenc->chlen++] = ch;
ch = wc & 0xFF;
if (!is_trailbyte(ch))
goto ilseq;
}
psenc->ch[psenc->chlen++] = ch;
if (n < psenc->chlen) {
*nresult = (size_t)-1;
return (E2BIG);
}
memcpy(s, psenc->ch, psenc->chlen);
*nresult = psenc->chlen;
psenc->chlen = 0;
return (0);
ilseq:
*nresult = (size_t)-1;
return (EILSEQ);
}
static __inline int
/*ARGSUSED*/
_citrus_DECHanyu_stdenc_wctocs(_DECHanyuEncodingInfo * __restrict ei __unused,
_csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
{
wchar_t mask;
int plane;
plane = 0;
mask = 0x7F;
/* XXX: assume wchar_t as int */
if ((uint32_t)wc > 0x7F) {
if ((uint32_t)wc > 0xFFFF) {
if ((wc & ~0xFFFF) != (wchar_t)HANYUBIT)
return (EILSEQ);
plane += 2;
}
if (!is_leadbyte((wc >> 8) & 0xFF) ||
!is_trailbyte(wc & 0xFF))
return (EILSEQ);
plane += (wc & 0x80) ? 1 : 2;
mask |= 0x7F00;
}
*csid = plane;
*idx = (_index_t)(wc & mask);
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_DECHanyu_stdenc_cstowc(_DECHanyuEncodingInfo * __restrict ei __unused,
wchar_t * __restrict wc, _csid_t csid, _index_t idx)
{
if (csid == 0) {
if (idx > 0x7F)
return (EILSEQ);
} else if (csid <= 4) {
if (!is_94charset(idx >> 8))
return (EILSEQ);
if (!is_94charset(idx & 0xFF))
return (EILSEQ);
if (csid % 2)
idx |= 0x80;
idx |= 0x8000;
if (csid > 2)
idx |= HANYUBIT;
} else
return (EILSEQ);
*wc = (wchar_t)idx;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_DECHanyu_stdenc_get_state_desc_generic(
_DECHanyuEncodingInfo * __restrict ei __unused,
_DECHanyuState * __restrict psenc, int * __restrict rstate)
{
*rstate = (psenc->chlen == 0)
? _STDENC_SDGEN_INITIAL
: _STDENC_SDGEN_INCOMPLETE_CHAR;
return (0);
}
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(DECHanyu);
_CITRUS_STDENC_DEF_OPS(DECHanyu);
#include "citrus_stdenc_template.h"