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freebsd-skq/sys/libkern/iconv_ucs.c
jhb 7a3f5808a0 Use strcasecmp() instead of strcmp() when checking user-supplied encoding 
names so that encoding names are treated as case-insensitive.  This allows
the use of 'utf-8' instead of 'UTF-8' for example and matches the behavior
of iconv(1).

PR:		167977
Submitted by:	buganini@gmail.com
MFC after:	1 week
2014-06-09 19:27:47 +00:00

539 lines
12 KiB
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/*-
* Copyright (c) 2003, 2005 Ryuichiro Imura
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/iconv.h>
#include "iconv_converter_if.h"
/*
* "UCS" converter
*/
#define KICONV_UCS_COMBINE 0x1
#define KICONV_UCS_FROM_UTF8 0x2
#define KICONV_UCS_TO_UTF8 0x4
#define KICONV_UCS_FROM_LE 0x8
#define KICONV_UCS_TO_LE 0x10
#define KICONV_UCS_FROM_UTF16 0x20
#define KICONV_UCS_TO_UTF16 0x40
#define KICONV_UCS_UCS4 0x80
#define ENCODING_UTF16 "UTF-16BE"
#define ENCODING_UTF8 "UTF-8"
static struct {
const char *name;
int from_flag, to_flag;
} unicode_family[] = {
{ "UTF-8", KICONV_UCS_FROM_UTF8, KICONV_UCS_TO_UTF8 },
{ "UCS-2LE", KICONV_UCS_FROM_LE, KICONV_UCS_TO_LE },
{ "UTF-16BE", KICONV_UCS_FROM_UTF16, KICONV_UCS_TO_UTF16 },
{ "UTF-16LE", KICONV_UCS_FROM_UTF16|KICONV_UCS_FROM_LE,
KICONV_UCS_TO_UTF16|KICONV_UCS_TO_LE },
{ NULL, 0, 0 }
};
static uint32_t utf8_to_ucs4(const char *src, size_t *utf8width, size_t srclen);
static u_char *ucs4_to_utf8(uint32_t ucs4, char * dst, size_t *utf8width, size_t dstlen);
static uint32_t encode_surrogate(uint32_t code);
static uint32_t decode_surrogate(const u_char *ucs);
#ifdef MODULE_DEPEND
MODULE_DEPEND(iconv_ucs, libiconv, 2, 2, 2);
#endif
/*
* UCS converter instance
*/
struct iconv_ucs {
KOBJ_FIELDS;
int convtype;
struct iconv_cspair * d_csp;
struct iconv_cspair * d_cspf;
void * f_ctp;
void * t_ctp;
void * ctype;
};
static int
iconv_ucs_open(struct iconv_converter_class *dcp,
struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
{
struct iconv_ucs *dp;
int i;
const char *from, *to;
dp = (struct iconv_ucs *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
to = csp->cp_to;
from = cspf ? cspf->cp_from : csp->cp_from;
dp->convtype = 0;
if (cspf)
dp->convtype |= KICONV_UCS_COMBINE;
for (i = 0; unicode_family[i].name; i++) {
if (strcasecmp(from, unicode_family[i].name) == 0)
dp->convtype |= unicode_family[i].from_flag;
if (strcasecmp(to, unicode_family[i].name) == 0)
dp->convtype |= unicode_family[i].to_flag;
}
if (strcmp(ENCODING_UNICODE, ENCODING_UTF16) == 0)
dp->convtype |= KICONV_UCS_UCS4;
else
dp->convtype &= ~KICONV_UCS_UCS4;
dp->f_ctp = dp->t_ctp = NULL;
if (dp->convtype & KICONV_UCS_COMBINE) {
if ((dp->convtype & KICONV_UCS_FROM_UTF8) == 0 &&
(dp->convtype & KICONV_UCS_FROM_LE) == 0) {
iconv_open(ENCODING_UNICODE, from, &dp->f_ctp);
}
if ((dp->convtype & KICONV_UCS_TO_UTF8) == 0 &&
(dp->convtype & KICONV_UCS_TO_LE) == 0) {
iconv_open(to, ENCODING_UNICODE, &dp->t_ctp);
}
}
dp->ctype = NULL;
if (dp->convtype & (KICONV_UCS_FROM_UTF8 | KICONV_UCS_TO_UTF8))
iconv_open(KICONV_WCTYPE_NAME, ENCODING_UTF8, &dp->ctype);
dp->d_csp = csp;
if (dp->convtype & (KICONV_UCS_FROM_UTF8 | KICONV_UCS_FROM_LE)) {
if (cspf) {
dp->d_cspf = cspf;
cspf->cp_refcount++;
} else
csp->cp_refcount++;
}
if (dp->convtype & (KICONV_UCS_TO_UTF8 | KICONV_UCS_TO_LE))
csp->cp_refcount++;
*dpp = (void*)dp;
return 0;
}
static int
iconv_ucs_close(void *data)
{
struct iconv_ucs *dp = data;
if (dp->f_ctp)
iconv_close(dp->f_ctp);
if (dp->t_ctp)
iconv_close(dp->t_ctp);
if (dp->ctype)
iconv_close(dp->ctype);
if (dp->d_cspf)
dp->d_cspf->cp_refcount--;
else if (dp->convtype & (KICONV_UCS_FROM_UTF8 | KICONV_UCS_FROM_LE))
dp->d_csp->cp_refcount--;
if (dp->convtype & (KICONV_UCS_TO_UTF8 | KICONV_UCS_TO_LE))
dp->d_csp->cp_refcount--;
kobj_delete((struct kobj*)data, M_ICONV);
return 0;
}
static int
iconv_ucs_conv(void *d2p, const char **inbuf,
size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
int convchar, int casetype)
{
struct iconv_ucs *dp = (struct iconv_ucs*)d2p;
int ret = 0, i;
size_t in, on, ir, or, inlen, outlen, ucslen;
const char *src, *p;
char *dst;
u_char ucs[4], *q;
uint32_t code;
if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
return 0;
ir = in = *inbytesleft;
or = on = *outbytesleft;
src = *inbuf;
dst = *outbuf;
while (ir > 0 && or > 0) {
/*
* The first half of conversion.
* (convert any code into ENCODING_UNICODE)
*/
code = 0;
p = src;
if (dp->convtype & KICONV_UCS_FROM_UTF8) {
/* convert UTF-8 to ENCODING_UNICODE */
inlen = 0;
code = utf8_to_ucs4(p, &inlen, ir);
if (code == 0) {
ret = -1;
break;
}
if (casetype == KICONV_FROM_LOWER && dp->ctype) {
code = towlower(code, dp->ctype);
} else if (casetype == KICONV_FROM_UPPER && dp->ctype) {
code = towupper(code, dp->ctype);
}
if ((code >= 0xd800 && code < 0xe000) || code >= 0x110000 ) {
/* reserved for utf-16 surrogate pair */
/* invalid unicode */
ret = -1;
break;
}
if (inlen == 4) {
if (dp->convtype & KICONV_UCS_UCS4) {
ucslen = 4;
code = encode_surrogate(code);
} else {
/* can't handle with ucs-2 */
ret = -1;
break;
}
} else {
ucslen = 2;
}
/* save UCS-4 into ucs[] */
for (q = ucs, i = ucslen - 1 ; i >= 0 ; i--)
*q++ = (code >> (i << 3)) & 0xff;
} else if (dp->convtype & KICONV_UCS_COMBINE && dp->f_ctp) {
/* convert local code to ENCODING_UNICODE */
ucslen = 4;
inlen = ir;
q = ucs;
ret = iconv_convchr_case(dp->f_ctp, &p, &inlen, (char **)&q,
&ucslen, casetype & (KICONV_FROM_LOWER | KICONV_FROM_UPPER));
if (ret)
break;
inlen = ir - inlen;
ucslen = 4 - ucslen;
} else {
/* src code is a proper subset of ENCODING_UNICODE */
q = ucs;
if (dp->convtype & KICONV_UCS_FROM_LE) {
*q = *(p + 1);
*(q + 1) = *p;
p += 2;
} else {
*q = *p++;
*(q + 1) = *p++;
}
if ((*q & 0xfc) == 0xd8) {
if (dp->convtype & KICONV_UCS_UCS4 &&
dp->convtype & KICONV_UCS_FROM_UTF16) {
inlen = ucslen = 4;
} else {
/* invalid unicode */
ret = -1;
break;
}
} else {
inlen = ucslen = 2;
}
if (ir < inlen) {
ret = -1;
break;
}
if (ucslen == 4) {
q += 2;
if (dp->convtype & KICONV_UCS_FROM_LE) {
*q = *(p + 1);
*(q + 1) = *p;
} else {
*q = *p++;
*(q + 1) = *p;
}
if ((*q & 0xfc) != 0xdc) {
/* invalid unicode */
ret = -1;
break;
}
}
}
/*
* The second half of conversion.
* (convert ENCODING_UNICODE into any code)
*/
p = ucs;
if (dp->convtype & KICONV_UCS_TO_UTF8) {
q = (u_char *)dst;
if (ucslen == 4 && dp->convtype & KICONV_UCS_UCS4) {
/* decode surrogate pair */
code = decode_surrogate(p);
} else {
code = (ucs[0] << 8) | ucs[1];
}
if (casetype == KICONV_LOWER && dp->ctype) {
code = towlower(code, dp->ctype);
} else if (casetype == KICONV_UPPER && dp->ctype) {
code = towupper(code, dp->ctype);
}
outlen = 0;
if (ucs4_to_utf8(code, q, &outlen, or) == NULL) {
ret = -1;
break;
}
src += inlen;
ir -= inlen;
dst += outlen;
or -= outlen;
} else if (dp->convtype & KICONV_UCS_COMBINE && dp->t_ctp) {
ret = iconv_convchr_case(dp->t_ctp, &p, &ucslen, &dst,
&or, casetype & (KICONV_LOWER | KICONV_UPPER));
if (ret)
break;
src += inlen;
ir -= inlen;
} else {
/* dst code is a proper subset of ENCODING_UNICODE */
if (or < ucslen) {
ret = -1;
break;
}
src += inlen;
ir -= inlen;
or -= ucslen;
if (dp->convtype & KICONV_UCS_TO_LE) {
*dst++ = *(p + 1);
*dst++ = *p;
p += 2;
} else {
*dst++ = *p++;
*dst++ = *p++;
}
if (ucslen == 4) {
if ((dp->convtype & KICONV_UCS_UCS4) == 0 ||
(dp->convtype & KICONV_UCS_TO_UTF16) == 0) {
ret = -1;
break;
}
if (dp->convtype & KICONV_UCS_TO_LE) {
*dst++ = *(p + 1);
*dst++ = *p;
} else {
*dst++ = *p++;
*dst++ = *p;
}
}
}
if (convchar == 1)
break;
}
*inbuf += in - ir;
*outbuf += on - or;
*inbytesleft -= in - ir;
*outbytesleft -= on - or;
return (ret);
}
static int
iconv_ucs_init(struct iconv_converter_class *dcp)
{
int error;
error = iconv_add(ENCODING_UNICODE, ENCODING_UNICODE, ENCODING_UTF8);
if (error)
return (error);
error = iconv_add(ENCODING_UNICODE, ENCODING_UTF8, ENCODING_UNICODE);
if (error)
return (error);
return (0);
}
static int
iconv_ucs_done(struct iconv_converter_class *dcp)
{
return (0);
}
static const char *
iconv_ucs_name(struct iconv_converter_class *dcp)
{
return (ENCODING_UNICODE);
}
static kobj_method_t iconv_ucs_methods[] = {
KOBJMETHOD(iconv_converter_open, iconv_ucs_open),
KOBJMETHOD(iconv_converter_close, iconv_ucs_close),
KOBJMETHOD(iconv_converter_conv, iconv_ucs_conv),
KOBJMETHOD(iconv_converter_init, iconv_ucs_init),
KOBJMETHOD(iconv_converter_done, iconv_ucs_done),
KOBJMETHOD(iconv_converter_name, iconv_ucs_name),
{0, 0}
};
KICONV_CONVERTER(ucs, sizeof(struct iconv_ucs));
static uint32_t
utf8_to_ucs4(const char *src, size_t *utf8width, size_t srclen)
{
size_t i, w = 0;
uint32_t ucs4 = 0;
/*
* get leading 1 byte from utf-8
*/
if ((*src & 0x80) == 0) {
/*
* leading 1 bit is "0"
* utf-8: 0xxxxxxx
* ucs-4: 00000000 00000000 00000000 0xxxxxxx
*/
w = 1;
/* get trailing 7 bits */
ucs4 = *src & 0x7f;
} else if ((*src & 0xe0) == 0xc0) {
/*
* leading 3 bits are "110"
* utf-8: 110xxxxx 10yyyyyy
* ucs-4: 00000000 00000000 00000xxx xxyyyyyy
*/
w = 2;
/* get trailing 5 bits */
ucs4 = *src & 0x1f;
} else if ((*src & 0xf0) == 0xe0) {
/*
* leading 4 bits are "1110"
* utf-8: 1110xxxx 10yyyyyy 10zzzzzz
* ucs-4: 00000000 00000000 xxxxyyyy yyzzzzzz
*/
w = 3;
/* get trailing 4 bits */
ucs4 = *src & 0x0f;
} else if ((*src & 0xf8) == 0xf0) {
/*
* leading 5 bits are "11110"
* utf-8: 11110www 10xxxxxx 10yyyyyy 10zzzzzz
* ucs-4: 00000000 000wwwxx xxxxyyyy yyzzzzzz
*/
w = 4;
/* get trailing 3 bits */
ucs4 = *src & 0x07;
} else {
/* out of utf-16 range or having illegal bits */
return (0);
}
if (srclen < w)
return (0);
/*
* get left parts from utf-8
*/
for (i = 1 ; i < w ; i++) {
if ((*(src + i) & 0xc0) != 0x80) {
/* invalid: leading 2 bits are not "10" */
return (0);
}
/* concatenate trailing 6 bits into ucs4 */
ucs4 <<= 6;
ucs4 |= *(src + i) & 0x3f;
}
*utf8width = w;
return (ucs4);
}
static u_char *
ucs4_to_utf8(uint32_t ucs4, char *dst, size_t *utf8width, size_t dstlen)
{
u_char lead, *p;
size_t i, w;
/*
* determine utf-8 width and leading bits
*/
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(register uint32_t code)
{
return ((((code - 0x10000) << 6) & 0x3ff0000) |
((code - 0x10000) & 0x3ff) | 0xd800dc00);
}
static uint32_t
decode_surrogate(register const u_char *ucs)
{
return ((((ucs[0] & 0x3) << 18) | (ucs[1] << 10) |
((ucs[2] & 0x3) << 8) | ucs[3]) + 0x10000);
}
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