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