/* $NetBSD: citrus_gbk2k.c,v 1.9 2022/04/19 20:32:14 rillig Exp $ */
/*-
* Copyright (c)2003 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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_gbk2k.c,v 1.9 2022/04/19 20:32:14 rillig Exp $");
#endif /* LIBC_SCCS and not lint */
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <wchar.h>
#include <sys/types.h>
#include <limits.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_bcs.h"
#include "citrus_module.h"
#include "citrus_ctype.h"
#include "citrus_stdenc.h"
#include "citrus_gbk2k.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
typedef struct _GBK2KState {
char ch[4];
int chlen;
} _GBK2KState;
typedef struct {
int mb_cur_max;
} _GBK2KEncodingInfo;
typedef struct {
_GBK2KEncodingInfo ei;
struct {
/* for future multi-locale facility */
_GBK2KState s_mblen;
_GBK2KState s_mbrlen;
_GBK2KState s_mbrtowc;
_GBK2KState s_mbtowc;
_GBK2KState s_mbsrtowcs;
_GBK2KState s_mbsnrtowcs;
_GBK2KState s_wcrtomb;
_GBK2KState s_wcsrtombs;
_GBK2KState s_wcsnrtombs;
_GBK2KState s_wctomb;
} states;
} _GBK2KCTypeInfo;
#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
#define _FUNCNAME(m) _citrus_GBK2K_##m
#define _ENCODING_INFO _GBK2KEncodingInfo
#define _CTYPE_INFO _GBK2KCTypeInfo
#define _ENCODING_STATE _GBK2KState
#define _ENCODING_MB_CUR_MAX(_ei_) (_ei_)->mb_cur_max
#define _ENCODING_IS_STATE_DEPENDENT 0
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
/*ARGSUSED*/
_citrus_GBK2K_init_state(_GBK2KEncodingInfo * __restrict ei,
_GBK2KState * __restrict s)
{
memset(s, 0, sizeof(*s));
}
static __inline void
/*ARGSUSED*/
_citrus_GBK2K_pack_state(_GBK2KEncodingInfo * __restrict ei,
void * __restrict pspriv,
const _GBK2KState * __restrict s)
{
memcpy(pspriv, (const void *)s, sizeof(*s));
}
static __inline void
/*ARGSUSED*/
_citrus_GBK2K_unpack_state(_GBK2KEncodingInfo * __restrict ei,
_GBK2KState * __restrict s,
const void * __restrict pspriv)
{
memcpy((void *)s, pspriv, sizeof(*s));
}
static __inline int
_mb_singlebyte(int c)
{
c &= 0xff;
return (c <= 0x7f);
}
static __inline int
_mb_leadbyte(int c)
{
c &= 0xff;
return (0x81 <= c && c <= 0xfe);
}
static __inline int
_mb_trailbyte(int c)
{
c &= 0xff;
return ((0x40 <= c && c <= 0x7e) || (0x80 <= c && c <= 0xfe));
}
static __inline int
_mb_surrogate(int c)
{
c &= 0xff;
return (0x30 <= c && c <= 0x39);
}
static __inline int
_mb_count(wchar_t v)
{
u_int32_t c;
c = (u_int32_t)v; /* XXX */
if (!(c & 0xffffff00))
return (1);
if (!(c & 0xffff0000))
return (2);
return (4);
}
#define _PSENC (psenc->ch[psenc->chlen - 1])
#define _PUSH_PSENC(c) (psenc->ch[psenc->chlen++] = (c))
static int
_citrus_GBK2K_mbrtowc_priv(_GBK2KEncodingInfo * __restrict ei,
wchar_t * __restrict pwc,
const char ** __restrict s, size_t n,
_GBK2KState * __restrict psenc,
size_t * __restrict nresult)
{
int chlenbak, len;
const char *s0, *s1;
wchar_t wc;
_DIAGASSERT(ei != NULL);
/* pwc may be NULL */
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
s0 = *s;
if (s0 == NULL) {
/* _citrus_GBK2K_init_state(ei, psenc); */
psenc->chlen = 0;
*nresult = 0;
return (0);
}
chlenbak = psenc->chlen;
switch (psenc->chlen) {
case 3:
if (!_mb_leadbyte (_PSENC))
goto invalid;
/* FALLTHROUGH */
case 2:
if (!_mb_surrogate(_PSENC) || _mb_trailbyte(_PSENC))
goto invalid;
/* FALLTHROUGH */
case 1:
if (!_mb_leadbyte (_PSENC))
goto invalid;
/* FALLTHOROUGH */
case 0:
break;
default:
goto invalid;
}
for (;;) {
if (n-- < 1)
goto restart;
_PUSH_PSENC(*s0++);
switch (psenc->chlen) {
case 1:
if (_mb_singlebyte(_PSENC))
goto convert;
if (_mb_leadbyte (_PSENC))
continue;
goto ilseq;
case 2:
if (_mb_trailbyte (_PSENC))
goto convert;
if (ei->mb_cur_max == 4 &&
_mb_surrogate (_PSENC))
continue;
goto ilseq;
case 3:
if (_mb_leadbyte (_PSENC))
continue;
goto ilseq;
case 4:
if (_mb_surrogate (_PSENC))
goto convert;
goto ilseq;
}
}
convert:
len = psenc->chlen;
s1 = &psenc->ch[0];
wc = 0;
while (len-- > 0)
wc = (wc << 8) | (*s1++ & 0xff);
if (pwc != NULL)
*pwc = wc;
*s = s0;
*nresult = (wc == 0) ? 0 : psenc->chlen - chlenbak;
/* _citrus_GBK2K_init_state(ei, psenc); */
psenc->chlen = 0;
return (0);
restart:
*s = s0;
*nresult = (size_t)-2;
return (0);
invalid:
return (EINVAL);
ilseq:
*nresult = (size_t)-1;
return (EILSEQ);
}
static int
_citrus_GBK2K_wcrtomb_priv(_GBK2KEncodingInfo * __restrict ei,
char * __restrict s, size_t n, wchar_t wc,
_GBK2KState * __restrict psenc,
size_t * __restrict nresult)
{
int len, ret;
_DIAGASSERT(ei != NULL);
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
if (psenc->chlen != 0) {
ret = EINVAL;
goto err;
}
len = _mb_count(wc);
if (n < len) {
ret = E2BIG;
goto err;
}
switch (len) {
case 1:
if (!_mb_singlebyte(_PUSH_PSENC(wc ))) {
ret = EILSEQ;
goto err;
}
break;
case 2:
if (!_mb_leadbyte (_PUSH_PSENC(wc >> 8)) ||
!_mb_trailbyte (_PUSH_PSENC(wc ))) {
ret = EILSEQ;
goto err;
}
break;
case 4:
if (ei->mb_cur_max != 4 ||
!_mb_leadbyte (_PUSH_PSENC(wc >> 24)) ||
!_mb_surrogate (_PUSH_PSENC(wc >> 16)) ||
!_mb_leadbyte (_PUSH_PSENC(wc >> 8)) ||
!_mb_surrogate (_PUSH_PSENC(wc ))) {
ret = EILSEQ;
goto err;
}
break;
}
_DIAGASSERT(len == psenc->chlen);
memcpy(s, psenc->ch, psenc->chlen);
*nresult = psenc->chlen;
/* _citrus_GBK2K_init_state(ei, psenc); */
psenc->chlen = 0;
return (0);
err:
*nresult = (size_t)-1;
return ret;
}
static __inline int
/*ARGSUSED*/
_citrus_GBK2K_stdenc_wctocs(_GBK2KEncodingInfo * __restrict ei,
_csid_t * __restrict csid,
_index_t * __restrict idx, wchar_t wc)
{
u_int8_t ch, cl;
_DIAGASSERT(csid != NULL && idx != NULL);
if ((u_int32_t)wc<0x80) {
/* ISO646 */
*csid = 0;
*idx = (_index_t)wc;
} else if ((u_int32_t)wc>=0x10000) {
/* GBKUCS : XXX */
*csid = 3;
*idx = (_index_t)wc;
} else {
ch = (u_int8_t)(wc >> 8);
cl = (u_int8_t)wc;
if (ch>=0xA1 && cl>=0xA1) {
/* EUC G1 */
*csid = 1;
*idx = (_index_t)wc & 0x7F7FU;
} else {
/* extended area (0x8140-) */
*csid = 2;
*idx = (_index_t)wc;
}
}
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_GBK2K_stdenc_cstowc(_GBK2KEncodingInfo * __restrict ei,
wchar_t * __restrict wc,
_csid_t csid, _index_t idx)
{
_DIAGASSERT(wc != NULL);
switch (csid) {
case 0:
/* ISO646 */
*wc = (wchar_t)idx;
break;
case 1:
/* EUC G1 */
*wc = (wchar_t)idx | 0x8080U;
break;
case 2:
/* extended area */
*wc = (wchar_t)idx;
break;
case 3:
/* GBKUCS : XXX */
if (ei->mb_cur_max != 4)
return EINVAL;
*wc = (wchar_t)idx;
break;
default:
return EILSEQ;
}
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_GBK2K_stdenc_get_state_desc_generic(_GBK2KEncodingInfo * __restrict ei,
_GBK2KState * __restrict psenc,
int * __restrict rstate)
{
if (psenc->chlen == 0)
*rstate = _STDENC_SDGEN_INITIAL;
else
*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
return 0;
}
static int
/*ARGSUSED*/
_citrus_GBK2K_encoding_module_init(_GBK2KEncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
const char *p;
_DIAGASSERT(ei != NULL);
p = var;
#define MATCH(x, act) \
do { \
if (lenvar >= (sizeof(#x)-1) && \
_bcs_strncasecmp(p, #x, sizeof(#x)-1) == 0) { \
act; \
lenvar -= sizeof(#x)-1; \
p += sizeof(#x)-1; \
} \
} while (0)
memset((void *)ei, 0, sizeof(*ei));
ei->mb_cur_max = 4;
while (lenvar>0) {
switch (_bcs_tolower(*p)) {
case '2':
MATCH("2byte", ei->mb_cur_max = 2);
break;
}
p++;
lenvar--;
}
return (0);
}
static void
/*ARGSUSED*/
_citrus_GBK2K_encoding_module_uninit(_GBK2KEncodingInfo *ei)
{
}
/* ----------------------------------------------------------------------
* public interface for ctype
*/
_CITRUS_CTYPE_DECLS(GBK2K);
_CITRUS_CTYPE_DEF_OPS(GBK2K);
#include "citrus_ctype_template.h"
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(GBK2K);
_CITRUS_STDENC_DEF_OPS(GBK2K);
#include "citrus_stdenc_template.h"