/* $NetBSD: citrus_euc.c,v 1.14 2009/01/11 02:46:24 christos Exp $ */
/*-
* Copyright (c)2002 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.
*/
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/types.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "citrus_namespace.h"
#include "citrus_bcs.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_stdenc.h"
#include "citrus_euc.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
typedef struct {
int chlen;
char ch[3];
} _EUCState;
typedef struct {
wchar_t bits[4];
wchar_t mask;
unsigned count[4];
unsigned mb_cur_max;
} _EUCEncodingInfo;
#define _SS2 0x008e
#define _SS3 0x008f
#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
#define _FUNCNAME(m) _citrus_EUC_##m
#define _ENCODING_INFO _EUCEncodingInfo
#define _ENCODING_STATE _EUCState
#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 int
_citrus_EUC_cs(unsigned int c)
{
c &= 0xff;
return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
}
static __inline int
_citrus_EUC_parse_variable(_EUCEncodingInfo *ei, const void *var,
size_t lenvar __unused)
{
char *e;
const char *v;
int x;
/* parse variable string */
if (!var)
return (EFTYPE);
v = (const char *)var;
while (*v == ' ' || *v == '\t')
++v;
ei->mb_cur_max = 1;
for (x = 0; x < 4; ++x) {
ei->count[x] = (int)_bcs_strtol(v, (char **)&e, 0);
if (v == e || !(v = e) || ei->count[x] < 1 || ei->count[x] > 4) {
return (EFTYPE);
}
if (ei->mb_cur_max < ei->count[x])
ei->mb_cur_max = ei->count[x];
while (*v == ' ' || *v == '\t')
++v;
ei->bits[x] = (int)_bcs_strtol(v, (char **)&e, 0);
if (v == e || !(v = e)) {
return (EFTYPE);
}
while (*v == ' ' || *v == '\t')
++v;
}
ei->mask = (int)_bcs_strtol(v, (char **)&e, 0);
if (v == e || !(v = e)) {
return (EFTYPE);
}
return (0);
}
static __inline void
/*ARGSUSED*/
_citrus_EUC_init_state(_EUCEncodingInfo *ei __unused, _EUCState *s)
{
memset(s, 0, sizeof(*s));
}
#if 0
static __inline void
/*ARGSUSED*/
_citrus_EUC_pack_state(_EUCEncodingInfo *ei __unused, void *pspriv,
const _EUCState *s)
{
memcpy(pspriv, (const void *)s, sizeof(*s));
}
static __inline void
/*ARGSUSED*/
_citrus_EUC_unpack_state(_EUCEncodingInfo *ei __unused, _EUCState *s,
const void *pspriv)
{
memcpy((void *)s, pspriv, sizeof(*s));
}
#endif
static int
_citrus_EUC_mbrtowc_priv(_EUCEncodingInfo *ei, wchar_t *pwc, char **s,
size_t n, _EUCState *psenc, size_t *nresult)
{
wchar_t wchar;
int c, chlenbak, cs, len;
char *s0, *s1 = NULL;
s0 = *s;
if (s0 == NULL) {
_citrus_EUC_init_state(ei, psenc);
*nresult = 0; /* state independent */
return (0);
}
chlenbak = psenc->chlen;
/* make sure we have the first byte in the buffer */
switch (psenc->chlen) {
case 0:
if (n < 1)
goto restart;
psenc->ch[0] = *s0++;
psenc->chlen = 1;
n--;
break;
case 1:
case 2:
break;
default:
/* illgeal state */
goto encoding_error;
}
c = ei->count[cs = _citrus_EUC_cs(psenc->ch[0] & 0xff)];
if (c == 0)
goto encoding_error;
while (psenc->chlen < c) {
if (n < 1)
goto restart;
psenc->ch[psenc->chlen] = *s0++;
psenc->chlen++;
n--;
}
*s = s0;
switch (cs) {
case 3:
case 2:
/* skip SS2/SS3 */
len = c - 1;
s1 = &psenc->ch[1];
break;
case 1:
case 0:
len = c;
s1 = &psenc->ch[0];
break;
default:
goto encoding_error;
}
wchar = 0;
while (len-- > 0)
wchar = (wchar << 8) | (*s1++ & 0xff);
wchar = (wchar & ~ei->mask) | ei->bits[cs];
psenc->chlen = 0;
if (pwc)
*pwc = wchar;
*nresult = wchar ? (size_t)(c - chlenbak) : 0;
return (0);
encoding_error:
psenc->chlen = 0;
*nresult = (size_t)-1;
return (EILSEQ);
restart:
*nresult = (size_t)-2;
*s = s0;
return (0);
}
static int
_citrus_EUC_wcrtomb_priv(_EUCEncodingInfo *ei, char *s, size_t n, wchar_t wc,
_EUCState *psenc __unused, size_t *nresult)
{
wchar_t m, nm;
unsigned int cs;
int ret;
short i;
m = wc & ei->mask;
nm = wc & ~m;
for (cs = 0; cs < sizeof(ei->count) / sizeof(ei->count[0]); cs++)
if (m == ei->bits[cs])
break;
/* fallback case - not sure if it is necessary */
if (cs == sizeof(ei->count) / sizeof(ei->count[0]))
cs = 1;
i = ei->count[cs];
if (n < (unsigned)i) {
ret = E2BIG;
goto err;
}
m = (cs) ? 0x80 : 0x00;
switch (cs) {
case 2:
*s++ = _SS2;
i--;
break;
case 3:
*s++ = _SS3;
i--;
break;
}
while (i-- > 0)
*s++ = ((nm >> (i << 3)) & 0xff) | m;
*nresult = (size_t)ei->count[cs];
return (0);
err:
*nresult = (size_t)-1;
return (ret);
}
static __inline int
/*ARGSUSED*/
_citrus_EUC_stdenc_wctocs(_EUCEncodingInfo * __restrict ei,
_csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
{
wchar_t m, nm;
m = wc & ei->mask;
nm = wc & ~m;
*csid = (_citrus_csid_t)m;
*idx = (_citrus_index_t)nm;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_EUC_stdenc_cstowc(_EUCEncodingInfo * __restrict ei,
wchar_t * __restrict wc, _csid_t csid, _index_t idx)
{
if ((csid & ~ei->mask) != 0 || (idx & ei->mask) != 0)
return (EINVAL);
*wc = (wchar_t)csid | (wchar_t)idx;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_EUC_stdenc_get_state_desc_generic(_EUCEncodingInfo * __restrict ei __unused,
_EUCState * __restrict psenc, int * __restrict rstate)
{
*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
_STDENC_SDGEN_INCOMPLETE_CHAR;
return (0);
}
static int
/*ARGSUSED*/
_citrus_EUC_encoding_module_init(_EUCEncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
return (_citrus_EUC_parse_variable(ei, var, lenvar));
}
static void
/*ARGSUSED*/
_citrus_EUC_encoding_module_uninit(_EUCEncodingInfo * __restrict ei __unused)
{
}
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(EUC);
_CITRUS_STDENC_DEF_OPS(EUC);
#include "citrus_stdenc_template.h"
