539 lines
12 KiB
C
539 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003, 2005 Ryuichiro Imura
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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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/iconv.h>
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#include "iconv_converter_if.h"
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/*
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* "UCS" converter
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*/
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#define KICONV_UCS_COMBINE 0x1
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#define KICONV_UCS_FROM_UTF8 0x2
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#define KICONV_UCS_TO_UTF8 0x4
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#define KICONV_UCS_FROM_LE 0x8
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#define KICONV_UCS_TO_LE 0x10
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#define KICONV_UCS_FROM_UTF16 0x20
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#define KICONV_UCS_TO_UTF16 0x40
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#define KICONV_UCS_UCS4 0x80
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#define ENCODING_UTF16 "UTF-16BE"
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#define ENCODING_UTF8 "UTF-8"
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static struct {
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const char *name;
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int from_flag, to_flag;
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} unicode_family[] = {
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{ "UTF-8", KICONV_UCS_FROM_UTF8, KICONV_UCS_TO_UTF8 },
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{ "UCS-2LE", KICONV_UCS_FROM_LE, KICONV_UCS_TO_LE },
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{ "UTF-16BE", KICONV_UCS_FROM_UTF16, KICONV_UCS_TO_UTF16 },
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{ "UTF-16LE", KICONV_UCS_FROM_UTF16|KICONV_UCS_FROM_LE,
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KICONV_UCS_TO_UTF16|KICONV_UCS_TO_LE },
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{ NULL, 0, 0 }
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};
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static uint32_t utf8_to_ucs4(const char *src, size_t *utf8width, size_t srclen);
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static u_char *ucs4_to_utf8(uint32_t ucs4, char * dst, size_t *utf8width, size_t dstlen);
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static uint32_t encode_surrogate(uint32_t code);
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static uint32_t decode_surrogate(const u_char *ucs);
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#ifdef MODULE_DEPEND
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MODULE_DEPEND(iconv_ucs, libiconv, 2, 2, 2);
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#endif
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/*
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* UCS converter instance
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*/
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struct iconv_ucs {
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KOBJ_FIELDS;
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int convtype;
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struct iconv_cspair * d_csp;
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struct iconv_cspair * d_cspf;
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void * f_ctp;
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void * t_ctp;
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void * ctype;
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};
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static int
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iconv_ucs_open(struct iconv_converter_class *dcp,
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struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
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{
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struct iconv_ucs *dp;
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int i;
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const char *from, *to;
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dp = (struct iconv_ucs *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
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to = csp->cp_to;
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from = cspf ? cspf->cp_from : csp->cp_from;
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dp->convtype = 0;
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if (cspf)
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dp->convtype |= KICONV_UCS_COMBINE;
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for (i = 0; unicode_family[i].name; i++) {
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if (strcasecmp(from, unicode_family[i].name) == 0)
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dp->convtype |= unicode_family[i].from_flag;
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if (strcasecmp(to, unicode_family[i].name) == 0)
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dp->convtype |= unicode_family[i].to_flag;
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}
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if (strcmp(ENCODING_UNICODE, ENCODING_UTF16) == 0)
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dp->convtype |= KICONV_UCS_UCS4;
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else
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dp->convtype &= ~KICONV_UCS_UCS4;
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dp->f_ctp = dp->t_ctp = NULL;
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if (dp->convtype & KICONV_UCS_COMBINE) {
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if ((dp->convtype & KICONV_UCS_FROM_UTF8) == 0 &&
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(dp->convtype & KICONV_UCS_FROM_LE) == 0) {
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iconv_open(ENCODING_UNICODE, from, &dp->f_ctp);
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}
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if ((dp->convtype & KICONV_UCS_TO_UTF8) == 0 &&
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(dp->convtype & KICONV_UCS_TO_LE) == 0) {
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iconv_open(to, ENCODING_UNICODE, &dp->t_ctp);
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}
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}
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dp->ctype = NULL;
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if (dp->convtype & (KICONV_UCS_FROM_UTF8 | KICONV_UCS_TO_UTF8))
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iconv_open(KICONV_WCTYPE_NAME, ENCODING_UTF8, &dp->ctype);
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dp->d_csp = csp;
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if (dp->convtype & (KICONV_UCS_FROM_UTF8 | KICONV_UCS_FROM_LE)) {
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if (cspf) {
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dp->d_cspf = cspf;
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cspf->cp_refcount++;
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} else
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csp->cp_refcount++;
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}
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if (dp->convtype & (KICONV_UCS_TO_UTF8 | KICONV_UCS_TO_LE))
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csp->cp_refcount++;
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*dpp = (void*)dp;
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return 0;
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}
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static int
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iconv_ucs_close(void *data)
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{
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struct iconv_ucs *dp = data;
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if (dp->f_ctp)
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iconv_close(dp->f_ctp);
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if (dp->t_ctp)
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iconv_close(dp->t_ctp);
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if (dp->ctype)
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iconv_close(dp->ctype);
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if (dp->d_cspf)
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dp->d_cspf->cp_refcount--;
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else if (dp->convtype & (KICONV_UCS_FROM_UTF8 | KICONV_UCS_FROM_LE))
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dp->d_csp->cp_refcount--;
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if (dp->convtype & (KICONV_UCS_TO_UTF8 | KICONV_UCS_TO_LE))
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dp->d_csp->cp_refcount--;
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kobj_delete((struct kobj*)data, M_ICONV);
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return 0;
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}
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static int
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iconv_ucs_conv(void *d2p, const char **inbuf,
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size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
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int convchar, int casetype)
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{
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struct iconv_ucs *dp = (struct iconv_ucs*)d2p;
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int ret = 0, i;
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size_t in, on, ir, or, inlen, outlen, ucslen;
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const char *src, *p;
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char *dst;
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u_char ucs[4], *q;
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uint32_t code;
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if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
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return 0;
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ir = in = *inbytesleft;
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or = on = *outbytesleft;
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src = *inbuf;
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dst = *outbuf;
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while (ir > 0 && or > 0) {
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/*
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* The first half of conversion.
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* (convert any code into ENCODING_UNICODE)
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*/
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code = 0;
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p = src;
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if (dp->convtype & KICONV_UCS_FROM_UTF8) {
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/* convert UTF-8 to ENCODING_UNICODE */
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inlen = 0;
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code = utf8_to_ucs4(p, &inlen, ir);
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if (code == 0) {
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ret = -1;
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break;
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}
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if (casetype == KICONV_FROM_LOWER && dp->ctype) {
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code = towlower(code, dp->ctype);
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} else if (casetype == KICONV_FROM_UPPER && dp->ctype) {
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code = towupper(code, dp->ctype);
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}
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if ((code >= 0xd800 && code < 0xe000) || code >= 0x110000 ) {
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/* reserved for utf-16 surrogate pair */
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/* invalid unicode */
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ret = -1;
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break;
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}
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if (inlen == 4) {
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if (dp->convtype & KICONV_UCS_UCS4) {
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ucslen = 4;
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code = encode_surrogate(code);
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} else {
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/* can't handle with ucs-2 */
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ret = -1;
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break;
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}
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} else {
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ucslen = 2;
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}
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/* save UCS-4 into ucs[] */
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for (q = ucs, i = ucslen - 1 ; i >= 0 ; i--)
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*q++ = (code >> (i << 3)) & 0xff;
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} else if (dp->convtype & KICONV_UCS_COMBINE && dp->f_ctp) {
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/* convert local code to ENCODING_UNICODE */
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ucslen = 4;
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inlen = ir;
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q = ucs;
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ret = iconv_convchr_case(dp->f_ctp, &p, &inlen, (char **)&q,
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&ucslen, casetype & (KICONV_FROM_LOWER | KICONV_FROM_UPPER));
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if (ret)
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break;
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inlen = ir - inlen;
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ucslen = 4 - ucslen;
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} else {
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/* src code is a proper subset of ENCODING_UNICODE */
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q = ucs;
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if (dp->convtype & KICONV_UCS_FROM_LE) {
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*q = *(p + 1);
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*(q + 1) = *p;
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p += 2;
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} else {
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*q = *p++;
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*(q + 1) = *p++;
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}
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if ((*q & 0xfc) == 0xd8) {
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if (dp->convtype & KICONV_UCS_UCS4 &&
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dp->convtype & KICONV_UCS_FROM_UTF16) {
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inlen = ucslen = 4;
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} else {
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/* invalid unicode */
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ret = -1;
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break;
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}
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} else {
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inlen = ucslen = 2;
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}
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if (ir < inlen) {
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ret = -1;
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break;
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}
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if (ucslen == 4) {
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q += 2;
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if (dp->convtype & KICONV_UCS_FROM_LE) {
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*q = *(p + 1);
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*(q + 1) = *p;
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} else {
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*q = *p++;
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*(q + 1) = *p;
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}
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if ((*q & 0xfc) != 0xdc) {
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/* invalid unicode */
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ret = -1;
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break;
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}
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}
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}
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/*
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* The second half of conversion.
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* (convert ENCODING_UNICODE into any code)
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*/
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p = ucs;
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if (dp->convtype & KICONV_UCS_TO_UTF8) {
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q = (u_char *)dst;
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if (ucslen == 4 && dp->convtype & KICONV_UCS_UCS4) {
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/* decode surrogate pair */
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code = decode_surrogate(p);
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} else {
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code = (ucs[0] << 8) | ucs[1];
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}
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if (casetype == KICONV_LOWER && dp->ctype) {
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code = towlower(code, dp->ctype);
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} else if (casetype == KICONV_UPPER && dp->ctype) {
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code = towupper(code, dp->ctype);
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}
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outlen = 0;
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if (ucs4_to_utf8(code, q, &outlen, or) == NULL) {
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ret = -1;
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break;
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}
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src += inlen;
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ir -= inlen;
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dst += outlen;
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or -= outlen;
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} else if (dp->convtype & KICONV_UCS_COMBINE && dp->t_ctp) {
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ret = iconv_convchr_case(dp->t_ctp, &p, &ucslen, &dst,
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&or, casetype & (KICONV_LOWER | KICONV_UPPER));
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if (ret)
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break;
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src += inlen;
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ir -= inlen;
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} else {
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/* dst code is a proper subset of ENCODING_UNICODE */
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if (or < ucslen) {
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ret = -1;
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break;
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}
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src += inlen;
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ir -= inlen;
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or -= ucslen;
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if (dp->convtype & KICONV_UCS_TO_LE) {
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*dst++ = *(p + 1);
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*dst++ = *p;
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p += 2;
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} else {
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*dst++ = *p++;
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*dst++ = *p++;
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}
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if (ucslen == 4) {
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if ((dp->convtype & KICONV_UCS_UCS4) == 0 ||
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(dp->convtype & KICONV_UCS_TO_UTF16) == 0) {
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ret = -1;
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break;
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}
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if (dp->convtype & KICONV_UCS_TO_LE) {
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*dst++ = *(p + 1);
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*dst++ = *p;
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} else {
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*dst++ = *p++;
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*dst++ = *p;
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}
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}
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}
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if (convchar == 1)
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break;
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}
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*inbuf += in - ir;
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*outbuf += on - or;
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*inbytesleft -= in - ir;
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*outbytesleft -= on - or;
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return (ret);
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}
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static int
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iconv_ucs_init(struct iconv_converter_class *dcp)
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{
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int error;
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error = iconv_add(ENCODING_UNICODE, ENCODING_UNICODE, ENCODING_UTF8);
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if (error)
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return (error);
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error = iconv_add(ENCODING_UNICODE, ENCODING_UTF8, ENCODING_UNICODE);
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if (error)
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return (error);
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return (0);
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}
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static int
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iconv_ucs_done(struct iconv_converter_class *dcp)
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{
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return (0);
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}
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static const char *
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iconv_ucs_name(struct iconv_converter_class *dcp)
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{
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return (ENCODING_UNICODE);
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}
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static kobj_method_t iconv_ucs_methods[] = {
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KOBJMETHOD(iconv_converter_open, iconv_ucs_open),
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KOBJMETHOD(iconv_converter_close, iconv_ucs_close),
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KOBJMETHOD(iconv_converter_conv, iconv_ucs_conv),
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KOBJMETHOD(iconv_converter_init, iconv_ucs_init),
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KOBJMETHOD(iconv_converter_done, iconv_ucs_done),
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KOBJMETHOD(iconv_converter_name, iconv_ucs_name),
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{0, 0}
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};
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KICONV_CONVERTER(ucs, sizeof(struct iconv_ucs));
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static uint32_t
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utf8_to_ucs4(const char *src, size_t *utf8width, size_t srclen)
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{
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size_t i, w = 0;
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uint32_t ucs4 = 0;
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/*
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* get leading 1 byte from utf-8
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*/
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if ((*src & 0x80) == 0) {
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/*
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* leading 1 bit is "0"
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* utf-8: 0xxxxxxx
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* ucs-4: 00000000 00000000 00000000 0xxxxxxx
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*/
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w = 1;
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/* get trailing 7 bits */
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ucs4 = *src & 0x7f;
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} else if ((*src & 0xe0) == 0xc0) {
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/*
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* leading 3 bits are "110"
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* utf-8: 110xxxxx 10yyyyyy
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* ucs-4: 00000000 00000000 00000xxx xxyyyyyy
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*/
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w = 2;
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/* get trailing 5 bits */
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ucs4 = *src & 0x1f;
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} else if ((*src & 0xf0) == 0xe0) {
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/*
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* leading 4 bits are "1110"
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* utf-8: 1110xxxx 10yyyyyy 10zzzzzz
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* ucs-4: 00000000 00000000 xxxxyyyy yyzzzzzz
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*/
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w = 3;
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/* get trailing 4 bits */
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ucs4 = *src & 0x0f;
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} else if ((*src & 0xf8) == 0xf0) {
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/*
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* leading 5 bits are "11110"
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* utf-8: 11110www 10xxxxxx 10yyyyyy 10zzzzzz
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* ucs-4: 00000000 000wwwxx xxxxyyyy yyzzzzzz
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*/
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w = 4;
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/* get trailing 3 bits */
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ucs4 = *src & 0x07;
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} else {
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/* out of utf-16 range or having illegal bits */
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return (0);
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}
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if (srclen < w)
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return (0);
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/*
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* get left parts from utf-8
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*/
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for (i = 1 ; i < w ; i++) {
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if ((*(src + i) & 0xc0) != 0x80) {
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/* invalid: leading 2 bits are not "10" */
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return (0);
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}
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/* concatenate trailing 6 bits into ucs4 */
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ucs4 <<= 6;
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ucs4 |= *(src + i) & 0x3f;
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}
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*utf8width = w;
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return (ucs4);
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}
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static u_char *
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ucs4_to_utf8(uint32_t ucs4, char *dst, size_t *utf8width, size_t dstlen)
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{
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u_char lead, *p;
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size_t i, w;
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/*
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* determine utf-8 width and leading bits
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*/
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if (ucs4 < 0x80) {
|
|
w = 1;
|
|
lead = 0; /* "0" */
|
|
} else if (ucs4 < 0x800) {
|
|
w = 2;
|
|
lead = 0xc0; /* "11" */
|
|
} else if (ucs4 < 0x10000) {
|
|
w = 3;
|
|
lead = 0xe0; /* "111" */
|
|
} else if (ucs4 < 0x200000) {
|
|
w = 4;
|
|
lead = 0xf0; /* "1111" */
|
|
} else {
|
|
return (NULL);
|
|
}
|
|
|
|
if (dstlen < w)
|
|
return (NULL);
|
|
|
|
/*
|
|
* construct utf-8
|
|
*/
|
|
p = dst;
|
|
for (i = w - 1 ; i >= 1 ; i--) {
|
|
/* get trailing 6 bits and put it with leading bit as "1" */
|
|
*(p + i) = (ucs4 & 0x3f) | 0x80;
|
|
ucs4 >>= 6;
|
|
}
|
|
*p = ucs4 | lead;
|
|
|
|
*utf8width = w;
|
|
|
|
return (p);
|
|
}
|
|
|
|
static uint32_t
|
|
encode_surrogate(uint32_t code)
|
|
{
|
|
return ((((code - 0x10000) << 6) & 0x3ff0000) |
|
|
((code - 0x10000) & 0x3ff) | 0xd800dc00);
|
|
}
|
|
|
|
static uint32_t
|
|
decode_surrogate(const u_char *ucs)
|
|
{
|
|
return ((((ucs[0] & 0x3) << 18) | (ucs[1] << 10) |
|
|
((ucs[2] & 0x3) << 8) | ucs[3]) + 0x10000);
|
|
}
|