458 lines
9.8 KiB
C
458 lines
9.8 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: citrus_zw.c,v 1.4 2008/06/14 16:01:08 tnozaki Exp $ */
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/*-
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* Copyright (c)2004, 2006 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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*/
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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 <stdio.h>
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#include <stdint.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_module.h"
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#include "citrus_stdenc.h"
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#include "citrus_zw.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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int dummy;
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} _ZWEncodingInfo;
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typedef enum {
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NONE, AMBIGIOUS, ASCII, GB2312
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} _ZWCharset;
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typedef struct {
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_ZWCharset charset;
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int chlen;
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char ch[4];
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} _ZWState;
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#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
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#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
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#define _FUNCNAME(m) _citrus_ZW_##m
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#define _ENCODING_INFO _ZWEncodingInfo
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#define _ENCODING_STATE _ZWState
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#define _ENCODING_MB_CUR_MAX(_ei_) MB_LEN_MAX
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#define _ENCODING_IS_STATE_DEPENDENT 1
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#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) ((_ps_)->charset != NONE)
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static __inline void
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/*ARGSUSED*/
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_citrus_ZW_init_state(_ZWEncodingInfo * __restrict ei __unused,
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_ZWState * __restrict psenc)
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{
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psenc->chlen = 0;
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psenc->charset = NONE;
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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_ZW_pack_state(_ZWEncodingInfo * __restrict ei __unused,
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void *__restrict pspriv, const _ZWState * __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_ZW_unpack_state(_ZWEncodingInfo * __restrict ei __unused,
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_ZWState * __restrict psenc, 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 int
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_citrus_ZW_mbrtowc_priv(_ZWEncodingInfo * __restrict ei,
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wchar_t * __restrict pwc, const char **__restrict s, size_t n,
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_ZWState * __restrict psenc, size_t * __restrict nresult)
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{
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const char *s0;
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wchar_t wc;
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int ch, len;
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if (*s == NULL) {
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_citrus_ZW_init_state(ei, psenc);
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*nresult = (size_t)_ENCODING_IS_STATE_DEPENDENT;
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return (0);
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}
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s0 = *s;
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len = 0;
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#define STORE \
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do { \
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if (n-- < 1) { \
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*nresult = (size_t)-2; \
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*s = s0; \
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return (0); \
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} \
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ch = (unsigned char)*s0++; \
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if (len++ > MB_LEN_MAX || ch > 0x7F)\
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goto ilseq; \
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psenc->ch[psenc->chlen++] = ch; \
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} while (/*CONSTCOND*/0)
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loop:
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switch (psenc->charset) {
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case ASCII:
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switch (psenc->chlen) {
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case 0:
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STORE;
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switch (psenc->ch[0]) {
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case '\0': case '\n':
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psenc->charset = NONE;
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}
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/*FALLTHROUGH*/
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case 1:
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break;
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default:
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return (EINVAL);
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}
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ch = (unsigned char)psenc->ch[0];
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if (ch > 0x7F)
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goto ilseq;
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wc = (wchar_t)ch;
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psenc->chlen = 0;
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break;
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case NONE:
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if (psenc->chlen != 0)
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return (EINVAL);
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STORE;
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ch = (unsigned char)psenc->ch[0];
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if (ch != 'z') {
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if (ch != '\n' && ch != '\0')
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psenc->charset = ASCII;
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wc = (wchar_t)ch;
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psenc->chlen = 0;
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break;
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}
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psenc->charset = AMBIGIOUS;
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psenc->chlen = 0;
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/* FALLTHROUGH */
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case AMBIGIOUS:
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if (psenc->chlen != 0)
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return (EINVAL);
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STORE;
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if (psenc->ch[0] != 'W') {
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psenc->charset = ASCII;
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wc = L'z';
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break;
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}
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psenc->charset = GB2312;
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psenc->chlen = 0;
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/* FALLTHROUGH */
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case GB2312:
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switch (psenc->chlen) {
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case 0:
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STORE;
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ch = (unsigned char)psenc->ch[0];
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if (ch == '\0') {
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psenc->charset = NONE;
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wc = (wchar_t)ch;
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psenc->chlen = 0;
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break;
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} else if (ch == '\n') {
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psenc->charset = NONE;
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psenc->chlen = 0;
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goto loop;
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}
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/*FALLTHROUGH*/
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case 1:
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STORE;
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if (psenc->ch[0] == ' ') {
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ch = (unsigned char)psenc->ch[1];
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wc = (wchar_t)ch;
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psenc->chlen = 0;
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break;
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} else if (psenc->ch[0] == '#') {
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ch = (unsigned char)psenc->ch[1];
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if (ch == '\n') {
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psenc->charset = NONE;
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wc = (wchar_t)ch;
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psenc->chlen = 0;
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break;
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} else if (ch == ' ') {
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wc = (wchar_t)ch;
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psenc->chlen = 0;
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break;
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}
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}
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ch = (unsigned char)psenc->ch[0];
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if (ch < 0x21 || ch > 0x7E)
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goto ilseq;
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wc = (wchar_t)(ch << 8);
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ch = (unsigned char)psenc->ch[1];
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if (ch < 0x21 || ch > 0x7E) {
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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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wc |= (wchar_t)ch;
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psenc->chlen = 0;
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break;
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default:
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return (EINVAL);
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}
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break;
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default:
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return (EINVAL);
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}
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if (pwc != NULL)
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*pwc = wc;
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*nresult = (size_t)(wc == 0 ? 0 : len);
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*s = s0;
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return (0);
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}
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static int
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/*ARGSUSED*/
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_citrus_ZW_wcrtomb_priv(_ZWEncodingInfo * __restrict ei __unused,
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char *__restrict s, size_t n, wchar_t wc,
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_ZWState * __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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if ((uint32_t)wc <= 0x7F) {
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ch = (unsigned char)wc;
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switch (psenc->charset) {
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case NONE:
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if (ch == '\0' || ch == '\n')
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psenc->ch[psenc->chlen++] = ch;
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else {
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if (n < 4)
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return (E2BIG);
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n -= 4;
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psenc->ch[psenc->chlen++] = 'z';
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psenc->ch[psenc->chlen++] = 'W';
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psenc->ch[psenc->chlen++] = ' ';
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psenc->ch[psenc->chlen++] = ch;
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psenc->charset = GB2312;
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}
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break;
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case GB2312:
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if (n < 2)
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return (E2BIG);
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n -= 2;
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if (ch == '\0') {
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psenc->ch[psenc->chlen++] = '\n';
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psenc->ch[psenc->chlen++] = '\0';
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psenc->charset = NONE;
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} else if (ch == '\n') {
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psenc->ch[psenc->chlen++] = '#';
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psenc->ch[psenc->chlen++] = '\n';
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psenc->charset = NONE;
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} else {
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psenc->ch[psenc->chlen++] = ' ';
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psenc->ch[psenc->chlen++] = ch;
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}
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break;
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default:
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return (EINVAL);
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}
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} else if ((uint32_t)wc <= 0x7E7E) {
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switch (psenc->charset) {
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case NONE:
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if (n < 2)
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return (E2BIG);
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n -= 2;
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psenc->ch[psenc->chlen++] = 'z';
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psenc->ch[psenc->chlen++] = 'W';
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psenc->charset = GB2312;
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/* FALLTHROUGH*/
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case GB2312:
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if (n < 2)
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return (E2BIG);
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n -= 2;
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ch = (wc >> 8) & 0xFF;
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if (ch < 0x21 || ch > 0x7E)
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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 (ch < 0x21 || ch > 0x7E)
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goto ilseq;
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psenc->ch[psenc->chlen++] = ch;
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break;
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default:
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return (EINVAL);
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}
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} else {
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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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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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}
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static int
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/*ARGSUSED*/
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_citrus_ZW_put_state_reset(_ZWEncodingInfo * __restrict ei __unused,
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char * __restrict s, size_t n, _ZWState * __restrict psenc,
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size_t * __restrict nresult)
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{
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if (psenc->chlen != 0)
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return (EINVAL);
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switch (psenc->charset) {
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case GB2312:
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if (n-- < 1)
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return (E2BIG);
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psenc->ch[psenc->chlen++] = '\n';
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psenc->charset = NONE;
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/*FALLTHROUGH*/
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case NONE:
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*nresult = psenc->chlen;
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if (psenc->chlen > 0) {
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memcpy(s, psenc->ch, psenc->chlen);
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psenc->chlen = 0;
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}
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break;
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default:
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return (EINVAL);
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}
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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_ZW_stdenc_get_state_desc_generic(_ZWEncodingInfo * __restrict ei __unused,
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_ZWState * __restrict psenc, int * __restrict rstate)
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{
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switch (psenc->charset) {
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case NONE:
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if (psenc->chlen != 0)
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return (EINVAL);
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*rstate = _STDENC_SDGEN_INITIAL;
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break;
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case AMBIGIOUS:
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if (psenc->chlen != 0)
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return (EINVAL);
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*rstate = _STDENC_SDGEN_INCOMPLETE_SHIFT;
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break;
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case ASCII:
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case GB2312:
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switch (psenc->chlen) {
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case 0:
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*rstate = _STDENC_SDGEN_STABLE;
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break;
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case 1:
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*rstate = (psenc->ch[0] == '#') ?
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_STDENC_SDGEN_INCOMPLETE_SHIFT :
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_STDENC_SDGEN_INCOMPLETE_CHAR;
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break;
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default:
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return (EINVAL);
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}
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break;
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default:
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return (EINVAL);
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}
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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_ZW_stdenc_wctocs(_ZWEncodingInfo * __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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*csid = (_csid_t)(wc <= (wchar_t)0x7FU) ? 0 : 1;
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*idx = (_index_t)wc;
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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_ZW_stdenc_cstowc(_ZWEncodingInfo * __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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switch (csid) {
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case 0: case 1:
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break;
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default:
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return (EINVAL);
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}
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*wc = (wchar_t)idx;
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return (0);
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}
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static void
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/*ARGSUSED*/
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_citrus_ZW_encoding_module_uninit(_ZWEncodingInfo *ei __unused)
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{
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}
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static int
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/*ARGSUSED*/
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_citrus_ZW_encoding_module_init(_ZWEncodingInfo * __restrict ei __unused,
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const void *__restrict var __unused, size_t lenvar __unused)
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{
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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(ZW);
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_CITRUS_STDENC_DEF_OPS(ZW);
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#include "citrus_stdenc_template.h"
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