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420 lines
8.4 KiB
C
420 lines
8.4 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: citrus_gbk2k.c,v 1.7 2008/06/14 16:01:07 tnozaki Exp $ */
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/*-
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* Copyright (c)2003 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 <stdbool.h>
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#include <stddef.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_gbk2k.h"
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/* ----------------------------------------------------------------------
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* private stuffs used by templates
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*/
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typedef struct _GBK2KState {
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int chlen;
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char ch[4];
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} _GBK2KState;
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typedef struct {
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int mb_cur_max;
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} _GBK2KEncodingInfo;
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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_GBK2K_##m
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#define _ENCODING_INFO _GBK2KEncodingInfo
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#define _ENCODING_STATE _GBK2KState
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#define _ENCODING_MB_CUR_MAX(_ei_) (_ei_)->mb_cur_max
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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_GBK2K_init_state(_GBK2KEncodingInfo * __restrict ei __unused,
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_GBK2KState * __restrict s)
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{
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memset(s, 0, sizeof(*s));
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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_GBK2K_pack_state(_GBK2KEncodingInfo * __restrict ei __unused,
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void * __restrict pspriv, const _GBK2KState * __restrict s)
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{
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memcpy(pspriv, (const void *)s, sizeof(*s));
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}
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static __inline void
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/*ARGSUSED*/
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_citrus_GBK2K_unpack_state(_GBK2KEncodingInfo * __restrict ei __unused,
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_GBK2KState * __restrict s, const void * __restrict pspriv)
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{
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memcpy((void *)s, pspriv, sizeof(*s));
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}
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#endif
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static __inline bool
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_mb_singlebyte(int c)
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{
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return ((c & 0xff) <= 0x7f);
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}
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static __inline bool
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_mb_leadbyte(int c)
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{
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c &= 0xff;
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return (0x81 <= c && c <= 0xfe);
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}
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static __inline bool
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_mb_trailbyte(int c)
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{
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c &= 0xff;
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return ((0x40 <= c && c <= 0x7e) || (0x80 <= c && c <= 0xfe));
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}
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static __inline bool
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_mb_surrogate(int c)
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{
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c &= 0xff;
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return (0x30 <= c && c <= 0x39);
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}
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static __inline int
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_mb_count(wchar_t v)
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{
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uint32_t c;
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c = (uint32_t)v; /* XXX */
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if (!(c & 0xffffff00))
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return (1);
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if (!(c & 0xffff0000))
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return (2);
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return (4);
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}
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#define _PSENC (psenc->ch[psenc->chlen - 1])
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#define _PUSH_PSENC(c) (psenc->ch[psenc->chlen++] = (c))
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static int
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_citrus_GBK2K_mbrtowc_priv(_GBK2KEncodingInfo * __restrict ei,
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wchar_t * __restrict pwc, const char ** __restrict s, size_t n,
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_GBK2KState * __restrict psenc, size_t * __restrict nresult)
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{
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const char *s0, *s1;
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wchar_t wc;
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int chlenbak, len;
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s0 = *s;
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if (s0 == NULL) {
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/* _citrus_GBK2K_init_state(ei, psenc); */
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psenc->chlen = 0;
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*nresult = 0;
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return (0);
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}
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chlenbak = psenc->chlen;
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switch (psenc->chlen) {
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case 3:
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if (!_mb_leadbyte (_PSENC))
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goto invalid;
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/* FALLTHROUGH */
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case 2:
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if (!_mb_surrogate(_PSENC) || _mb_trailbyte(_PSENC))
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goto invalid;
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/* FALLTHROUGH */
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case 1:
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if (!_mb_leadbyte (_PSENC))
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goto invalid;
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/* FALLTHOROUGH */
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case 0:
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break;
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default:
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goto invalid;
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}
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for (;;) {
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if (n-- < 1)
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goto restart;
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_PUSH_PSENC(*s0++);
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switch (psenc->chlen) {
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case 1:
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if (_mb_singlebyte(_PSENC))
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goto convert;
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if (_mb_leadbyte (_PSENC))
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continue;
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goto ilseq;
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case 2:
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if (_mb_trailbyte (_PSENC))
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goto convert;
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if (ei->mb_cur_max == 4 &&
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_mb_surrogate (_PSENC))
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continue;
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goto ilseq;
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case 3:
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if (_mb_leadbyte (_PSENC))
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continue;
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goto ilseq;
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case 4:
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if (_mb_surrogate (_PSENC))
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goto convert;
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goto ilseq;
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}
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}
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convert:
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len = psenc->chlen;
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s1 = &psenc->ch[0];
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wc = 0;
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while (len-- > 0)
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wc = (wc << 8) | (*s1++ & 0xff);
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if (pwc != NULL)
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*pwc = wc;
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*s = s0;
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*nresult = (wc == 0) ? 0 : psenc->chlen - chlenbak;
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/* _citrus_GBK2K_init_state(ei, psenc); */
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psenc->chlen = 0;
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return (0);
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restart:
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*s = s0;
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*nresult = (size_t)-2;
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return (0);
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invalid:
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return (EINVAL);
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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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_citrus_GBK2K_wcrtomb_priv(_GBK2KEncodingInfo * __restrict ei,
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char * __restrict s, size_t n, wchar_t wc, _GBK2KState * __restrict psenc,
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size_t * __restrict nresult)
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{
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size_t len;
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int ret;
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if (psenc->chlen != 0) {
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ret = EINVAL;
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goto err;
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}
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len = _mb_count(wc);
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if (n < len) {
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ret = E2BIG;
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goto err;
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}
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switch (len) {
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case 1:
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if (!_mb_singlebyte(_PUSH_PSENC(wc ))) {
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ret = EILSEQ;
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goto err;
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}
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break;
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case 2:
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if (!_mb_leadbyte (_PUSH_PSENC(wc >> 8)) ||
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!_mb_trailbyte (_PUSH_PSENC(wc))) {
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ret = EILSEQ;
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goto err;
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}
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break;
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case 4:
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if (ei->mb_cur_max != 4 ||
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!_mb_leadbyte (_PUSH_PSENC(wc >> 24)) ||
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!_mb_surrogate (_PUSH_PSENC(wc >> 16)) ||
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!_mb_leadbyte (_PUSH_PSENC(wc >> 8)) ||
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!_mb_surrogate (_PUSH_PSENC(wc))) {
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ret = EILSEQ;
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goto err;
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}
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break;
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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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/* _citrus_GBK2K_init_state(ei, psenc); */
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psenc->chlen = 0;
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return (0);
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err:
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*nresult = (size_t)-1;
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return (ret);
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}
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static __inline int
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/*ARGSUSED*/
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_citrus_GBK2K_stdenc_wctocs(_GBK2KEncodingInfo * __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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uint8_t ch, cl;
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if ((uint32_t)wc < 0x80) {
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/* ISO646 */
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*csid = 0;
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*idx = (_index_t)wc;
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} else if ((uint32_t)wc >= 0x10000) {
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/* GBKUCS : XXX */
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*csid = 3;
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*idx = (_index_t)wc;
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} else {
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ch = (uint8_t)(wc >> 8);
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cl = (uint8_t)wc;
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if (ch >= 0xA1 && cl >= 0xA1) {
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/* EUC G1 */
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*csid = 1;
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*idx = (_index_t)wc & 0x7F7FU;
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} else {
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/* extended area (0x8140-) */
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*csid = 2;
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*idx = (_index_t)wc;
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}
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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_GBK2K_stdenc_cstowc(_GBK2KEncodingInfo * __restrict ei,
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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:
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/* ISO646 */
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*wc = (wchar_t)idx;
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break;
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case 1:
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/* EUC G1 */
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*wc = (wchar_t)idx | 0x8080U;
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break;
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case 2:
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/* extended area */
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*wc = (wchar_t)idx;
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break;
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case 3:
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/* GBKUCS : XXX */
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if (ei->mb_cur_max != 4)
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return (EINVAL);
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*wc = (wchar_t)idx;
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break;
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default:
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return (EILSEQ);
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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_GBK2K_stdenc_get_state_desc_generic(_GBK2KEncodingInfo * __restrict ei __unused,
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_GBK2KState * __restrict psenc, int * __restrict rstate)
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{
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*rstate = (psenc->chlen == 0) ? _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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static int
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/*ARGSUSED*/
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_citrus_GBK2K_encoding_module_init(_GBK2KEncodingInfo * __restrict ei,
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const void * __restrict var, size_t lenvar)
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{
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const char *p;
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p = var;
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memset((void *)ei, 0, sizeof(*ei));
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ei->mb_cur_max = 4;
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while (lenvar > 0) {
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switch (_bcs_tolower(*p)) {
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case '2':
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MATCH("2byte", ei->mb_cur_max = 2);
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break;
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}
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p++;
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lenvar--;
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}
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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_GBK2K_encoding_module_uninit(_GBK2KEncodingInfo *ei __unused)
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{
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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(GBK2K);
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_CITRUS_STDENC_DEF_OPS(GBK2K);
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#include "citrus_stdenc_template.h"
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