521 lines
11 KiB
C
521 lines
11 KiB
C
/*
|
|
* $Id$
|
|
*
|
|
Copyright (c) 2014-2015 Chung, Hyung-Hwan. 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 "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 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 "stix-prv.h"
|
|
|
|
#define STIX_BCLEN_MAX 6
|
|
|
|
/*
|
|
* from RFC 2279 UTF-8, a transformation format of ISO 10646
|
|
*
|
|
* UCS-4 range (hex.) UTF-8 octet sequence (binary)
|
|
* 1:2 00000000-0000007F 0xxxxxxx
|
|
* 2:2 00000080-000007FF 110xxxxx 10xxxxxx
|
|
* 3:2 00000800-0000FFFF 1110xxxx 10xxxxxx 10xxxxxx
|
|
* 4:4 00010000-001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
|
|
* inv 00200000-03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
|
|
* inv 04000000-7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
|
|
*/
|
|
|
|
struct __utf8_t
|
|
{
|
|
stix_uint32_t lower;
|
|
stix_uint32_t upper;
|
|
stix_uint8_t fbyte; /* mask to the first utf8 byte */
|
|
stix_uint8_t mask;
|
|
stix_uint8_t fmask;
|
|
int length; /* number of bytes */
|
|
};
|
|
|
|
typedef struct __utf8_t __utf8_t;
|
|
|
|
static __utf8_t utf8_table[] =
|
|
{
|
|
{0x00000000ul, 0x0000007Ful, 0x00, 0x80, 0x7F, 1},
|
|
{0x00000080ul, 0x000007FFul, 0xC0, 0xE0, 0x1F, 2},
|
|
{0x00000800ul, 0x0000FFFFul, 0xE0, 0xF0, 0x0F, 3},
|
|
{0x00010000ul, 0x001FFFFFul, 0xF0, 0xF8, 0x07, 4},
|
|
{0x00200000ul, 0x03FFFFFFul, 0xF8, 0xFC, 0x03, 5},
|
|
{0x04000000ul, 0x7FFFFFFFul, 0xFC, 0xFE, 0x01, 6}
|
|
};
|
|
|
|
static STIX_INLINE __utf8_t* get_utf8_slot (stix_uch_t uc)
|
|
{
|
|
__utf8_t* cur, * end;
|
|
|
|
STIX_ASSERT (STIX_SIZEOF(stix_bch_t) == 1);
|
|
STIX_ASSERT (STIX_SIZEOF(stix_uch_t) >= 2);
|
|
|
|
end = utf8_table + STIX_COUNTOF(utf8_table);
|
|
cur = utf8_table;
|
|
|
|
while (cur < end)
|
|
{
|
|
if (uc >= cur->lower && uc <= cur->upper) return cur;
|
|
cur++;
|
|
}
|
|
|
|
return STIX_NULL; /* invalid character */
|
|
}
|
|
|
|
stix_oow_t stix_uctoutf8 (stix_uch_t uc, stix_bch_t* utf8, stix_oow_t size)
|
|
{
|
|
__utf8_t* cur = get_utf8_slot (uc);
|
|
|
|
if (cur == STIX_NULL) return 0; /* illegal character */
|
|
|
|
if (utf8 && cur->length <= size)
|
|
{
|
|
int index = cur->length;
|
|
while (index > 1)
|
|
{
|
|
/*
|
|
* 0x3F: 00111111
|
|
* 0x80: 10000000
|
|
*/
|
|
utf8[--index] = (uc & 0x3F) | 0x80;
|
|
uc >>= 6;
|
|
}
|
|
|
|
utf8[0] = uc | cur->fbyte;
|
|
}
|
|
|
|
/* small buffer is also indicated by this return value
|
|
* greater than 'size'. */
|
|
return (stix_oow_t)cur->length;
|
|
}
|
|
|
|
stix_oow_t stix_utf8touc (const stix_bch_t* utf8, stix_oow_t size, stix_uch_t* uc)
|
|
{
|
|
__utf8_t* cur, * end;
|
|
|
|
STIX_ASSERT (utf8 != STIX_NULL);
|
|
STIX_ASSERT (size > 0);
|
|
STIX_ASSERT (STIX_SIZEOF(stix_bch_t) == 1);
|
|
STIX_ASSERT (STIX_SIZEOF(stix_uch_t) >= 2);
|
|
|
|
end = utf8_table + STIX_COUNTOF(utf8_table);
|
|
cur = utf8_table;
|
|
|
|
while (cur < end)
|
|
{
|
|
if ((utf8[0] & cur->mask) == cur->fbyte)
|
|
{
|
|
|
|
/* if size is less that cur->length, the incomplete-seqeunce
|
|
* error is naturally indicated. so validate the string
|
|
* only if size is as large as cur->length. */
|
|
|
|
if (size >= cur->length)
|
|
{
|
|
int i;
|
|
|
|
if (uc)
|
|
{
|
|
stix_uch_t w;
|
|
|
|
w = utf8[0] & cur->fmask;
|
|
for (i = 1; i < cur->length; i++)
|
|
{
|
|
/* in utf8, trailing bytes are all
|
|
* set with 0x80.
|
|
*
|
|
* 10XXXXXX & 11000000 => 10000000
|
|
*
|
|
* if not, invalid. */
|
|
if ((utf8[i] & 0xC0) != 0x80) return 0;
|
|
w = (w << 6) | (utf8[i] & 0x3F);
|
|
}
|
|
*uc = w;
|
|
}
|
|
else
|
|
{
|
|
for (i = 1; i < cur->length; i++)
|
|
{
|
|
/* in utf8, trailing bytes are all
|
|
* set with 0x80.
|
|
*
|
|
* 10XXXXXX & 11000000 => 10000000
|
|
*
|
|
* if not, invalid. */
|
|
if ((utf8[i] & 0xC0) != 0x80) return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* this return value can indicate both
|
|
* the correct length (size >= cur->length)
|
|
* and
|
|
* the incomplete seqeunce error (size < cur->length).
|
|
*/
|
|
return (stix_oow_t)cur->length;
|
|
}
|
|
cur++;
|
|
}
|
|
|
|
return 0; /* error - invalid sequence */
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static STIX_INLINE int bcsn_to_ucsn_with_cmgr (
|
|
const stix_bch_t* bcs, stix_oow_t* bcslen,
|
|
stix_uch_t* ucs, stix_oow_t* ucslen, stix_cmgr_t* cmgr, int all)
|
|
{
|
|
const stix_bch_t* p;
|
|
int ret = 0;
|
|
stix_oow_t mlen;
|
|
|
|
if (ucs)
|
|
{
|
|
/* destination buffer is specified.
|
|
* copy the conversion result to the buffer */
|
|
|
|
stix_uch_t* q, * qend;
|
|
|
|
p = bcs;
|
|
q = ucs;
|
|
qend = ucs + *ucslen;
|
|
mlen = *bcslen;
|
|
|
|
while (mlen > 0)
|
|
{
|
|
stix_oow_t n;
|
|
|
|
if (q >= qend)
|
|
{
|
|
/* buffer too small */
|
|
ret = -2;
|
|
break;
|
|
}
|
|
|
|
n = cmgr->bctouc (p, mlen, q);
|
|
if (n == 0)
|
|
{
|
|
/* invalid sequence */
|
|
if (all)
|
|
{
|
|
n = 1;
|
|
*q = '?';
|
|
}
|
|
else
|
|
{
|
|
ret = -1;
|
|
break;
|
|
}
|
|
}
|
|
if (n > mlen)
|
|
{
|
|
/* incomplete sequence */
|
|
if (all)
|
|
{
|
|
n = 1;
|
|
*q = '?';
|
|
}
|
|
else
|
|
{
|
|
ret = -3;
|
|
break;
|
|
}
|
|
}
|
|
|
|
q++;
|
|
p += n;
|
|
mlen -= n;
|
|
}
|
|
|
|
*ucslen = q - ucs;
|
|
*bcslen = p - bcs;
|
|
}
|
|
else
|
|
{
|
|
/* no destination buffer is specified. perform conversion
|
|
* but don't copy the result. the caller can call this function
|
|
* without a buffer to find the required buffer size, allocate
|
|
* a buffer with the size and call this function again with
|
|
* the buffer. */
|
|
|
|
stix_uch_t w;
|
|
stix_oow_t wlen = 0;
|
|
|
|
p = bcs;
|
|
mlen = *bcslen;
|
|
|
|
while (mlen > 0)
|
|
{
|
|
stix_oow_t n;
|
|
|
|
n = cmgr->bctouc (p, mlen, &w);
|
|
if (n == 0)
|
|
{
|
|
/* invalid sequence */
|
|
if (all) n = 1;
|
|
else
|
|
{
|
|
ret = -1;
|
|
break;
|
|
}
|
|
}
|
|
if (n > mlen)
|
|
{
|
|
/* incomplete sequence */
|
|
if (all) n = 1;
|
|
else
|
|
{
|
|
ret = -3;
|
|
break;
|
|
}
|
|
}
|
|
|
|
p += n;
|
|
mlen -= n;
|
|
wlen += 1;
|
|
}
|
|
|
|
*ucslen = wlen;
|
|
*bcslen = p - bcs;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static STIX_INLINE int bcs_to_ucs_with_cmgr (
|
|
const stix_bch_t* bcs, stix_oow_t* bcslen,
|
|
stix_uch_t* ucs, stix_oow_t* ucslen, stix_cmgr_t* cmgr, int all)
|
|
{
|
|
const stix_bch_t* bp;
|
|
stix_oow_t mlen, wlen;
|
|
int n;
|
|
|
|
for (bp = bcs; *bp != '\0'; bp++) /* nothing */ ;
|
|
|
|
mlen = bp - bcs; wlen = *ucslen;
|
|
n = bcsn_to_ucsn_with_cmgr (bcs, &mlen, ucs, &wlen, cmgr, all);
|
|
if (ucs)
|
|
{
|
|
/* null-terminate the target buffer if it has room for it. */
|
|
if (wlen < *ucslen) ucs[wlen] = '\0';
|
|
else n = -2; /* buffer too small */
|
|
}
|
|
*bcslen = mlen; *ucslen = wlen;
|
|
|
|
return n;
|
|
}
|
|
|
|
static STIX_INLINE int ucsn_to_bcsn_with_cmgr (
|
|
const stix_uch_t* ucs, stix_oow_t* ucslen,
|
|
stix_bch_t* bcs, stix_oow_t* bcslen, stix_cmgr_t* cmgr)
|
|
{
|
|
const stix_uch_t* p = ucs;
|
|
const stix_uch_t* end = ucs + *ucslen;
|
|
int ret = 0;
|
|
|
|
if (bcs)
|
|
{
|
|
stix_oow_t rem = *bcslen;
|
|
|
|
while (p < end)
|
|
{
|
|
stix_oow_t n;
|
|
|
|
if (rem <= 0)
|
|
{
|
|
ret = -2; /* buffer too small */
|
|
break;
|
|
}
|
|
|
|
n = cmgr->uctobc (*p, bcs, rem);
|
|
if (n == 0)
|
|
{
|
|
ret = -1;
|
|
break; /* illegal character */
|
|
}
|
|
if (n > rem)
|
|
{
|
|
ret = -2; /* buffer too small */
|
|
break;
|
|
}
|
|
bcs += n; rem -= n; p++;
|
|
}
|
|
|
|
*bcslen -= rem;
|
|
}
|
|
else
|
|
{
|
|
stix_bch_t bcsbuf[STIX_BCLEN_MAX];
|
|
stix_oow_t mlen = 0;
|
|
|
|
while (p < end)
|
|
{
|
|
stix_oow_t n;
|
|
|
|
n = cmgr->uctobc (*p, bcsbuf, STIX_COUNTOF(bcsbuf));
|
|
if (n == 0)
|
|
{
|
|
ret = -1;
|
|
break; /* illegal character */
|
|
}
|
|
|
|
/* it assumes that bcsbuf is large enough to hold a character */
|
|
STIX_ASSERT (n <= STIX_COUNTOF(bcsbuf));
|
|
|
|
p++; mlen += n;
|
|
}
|
|
|
|
/* this length excludes the terminating null character.
|
|
* this function doesn't even null-terminate the result. */
|
|
*bcslen = mlen;
|
|
}
|
|
|
|
*ucslen = p - ucs;
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int ucs_to_bcs_with_cmgr (
|
|
const stix_uch_t* ucs, stix_oow_t* ucslen,
|
|
stix_bch_t* bcs, stix_oow_t* bcslen, stix_cmgr_t* cmgr)
|
|
{
|
|
const stix_uch_t* p = ucs;
|
|
int ret = 0;
|
|
|
|
if (bcs)
|
|
{
|
|
stix_oow_t rem = *bcslen;
|
|
|
|
while (*p != '\0')
|
|
{
|
|
stix_oow_t n;
|
|
|
|
if (rem <= 0)
|
|
{
|
|
ret = -2;
|
|
break;
|
|
}
|
|
|
|
n = cmgr->uctobc (*p, bcs, rem);
|
|
if (n == 0)
|
|
{
|
|
ret = -1;
|
|
break; /* illegal character */
|
|
}
|
|
if (n > rem)
|
|
{
|
|
ret = -2;
|
|
break; /* buffer too small */
|
|
}
|
|
|
|
bcs += n; rem -= n; p++;
|
|
}
|
|
|
|
/* update bcslen to the length of the bcs string converted excluding
|
|
* terminating null */
|
|
*bcslen -= rem;
|
|
|
|
/* null-terminate the multibyte sequence if it has sufficient space */
|
|
if (rem > 0) *bcs = '\0';
|
|
else
|
|
{
|
|
/* if ret is -2 and cs[cslen] == '\0',
|
|
* this means that the bcs buffer was lacking one
|
|
* slot for the terminating null */
|
|
ret = -2; /* buffer too small */
|
|
}
|
|
}
|
|
else
|
|
{
|
|
stix_bch_t bcsbuf[STIX_BCLEN_MAX];
|
|
stix_oow_t mlen = 0;
|
|
|
|
while (*p != '\0')
|
|
{
|
|
stix_oow_t n;
|
|
|
|
n = cmgr->uctobc (*p, bcsbuf, STIX_COUNTOF(bcsbuf));
|
|
if (n == 0)
|
|
{
|
|
ret = -1;
|
|
break; /* illegal character */
|
|
}
|
|
|
|
/* it assumes that bcs is large enough to hold a character */
|
|
STIX_ASSERT (n <= STIX_COUNTOF(bcs));
|
|
|
|
p++; mlen += n;
|
|
}
|
|
|
|
/* this length holds the number of resulting multi-byte characters
|
|
* excluding the terminating null character */
|
|
*bcslen = mlen;
|
|
}
|
|
|
|
*ucslen = p - ucs; /* the number of wide characters handled. */
|
|
return ret;
|
|
}
|
|
|
|
static stix_cmgr_t utf8_cmgr =
|
|
{
|
|
stix_utf8touc,
|
|
stix_uctoutf8
|
|
};
|
|
|
|
int stix_utf8toucs (const stix_bch_t* bcs, stix_oow_t* bcslen, stix_uch_t* ucs, stix_oow_t* ucslen)
|
|
{
|
|
if (*bcslen == ~(stix_oow_t)0)
|
|
{
|
|
/* the source is null-terminated. */
|
|
return bcs_to_ucs_with_cmgr (bcs, bcslen, ucs, ucslen, &utf8_cmgr, 0);
|
|
}
|
|
else
|
|
{
|
|
/* the source is length bound */
|
|
return bcsn_to_ucsn_with_cmgr (bcs, bcslen, ucs, ucslen, &utf8_cmgr, 0);
|
|
}
|
|
}
|
|
|
|
int stix_ucstoutf8 (const stix_uch_t* ucs, stix_oow_t *ucslen, stix_bch_t* bcs, stix_oow_t* bcslen)
|
|
{
|
|
if (*ucslen == ~(stix_oow_t)0)
|
|
{
|
|
/* null-terminated */
|
|
return ucs_to_bcs_with_cmgr (ucs, ucslen, bcs, bcslen, &utf8_cmgr);
|
|
}
|
|
else
|
|
{
|
|
/* length bound */
|
|
return ucsn_to_bcsn_with_cmgr (ucs, ucslen, bcs, bcslen, &utf8_cmgr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
stix_oow_t stix_ucslen (const stix_uch_t* ucs)
|
|
{
|
|
const stix_uch_t* ptr = ucs;
|
|
while (*ptr) ptr = STIX_INCPTR(const stix_uch_t, ptr, 1);
|
|
return STIX_SUBPTR(const stix_uch_t, ptr, ucs);
|
|
}
|
|
*/
|