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freebsd-dev/lib/libiconv_modules/UTF1632/citrus_utf1632.c
Pedro F. Giffuni 5e53a4f90f lib: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00

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/* $FreeBSD$ */
/* $NetBSD: citrus_utf1632.c,v 1.9 2008/06/14 16:01:08 tnozaki Exp $ */
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c)2003 Citrus Project,
* 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>
#include <sys/endian.h>
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_stdenc.h"
#include "citrus_bcs.h"
#include "citrus_utf1632.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
typedef struct {
int chlen;
int current_endian;
uint8_t ch[4];
} _UTF1632State;
#define _ENDIAN_UNKNOWN 0
#define _ENDIAN_BIG 1
#define _ENDIAN_LITTLE 2
#if BYTE_ORDER == BIG_ENDIAN
#define _ENDIAN_INTERNAL _ENDIAN_BIG
#define _ENDIAN_SWAPPED _ENDIAN_LITTLE
#else
#define _ENDIAN_INTERNAL _ENDIAN_LITTLE
#define _ENDIAN_SWAPPED _ENDIAN_BIG
#endif
#define _MODE_UTF32 0x00000001U
#define _MODE_FORCE_ENDIAN 0x00000002U
typedef struct {
int preffered_endian;
unsigned int cur_max;
uint32_t mode;
} _UTF1632EncodingInfo;
#define _FUNCNAME(m) _citrus_UTF1632_##m
#define _ENCODING_INFO _UTF1632EncodingInfo
#define _ENCODING_STATE _UTF1632State
#define _ENCODING_MB_CUR_MAX(_ei_) ((_ei_)->cur_max)
#define _ENCODING_IS_STATE_DEPENDENT 0
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
/*ARGSUSED*/
_citrus_UTF1632_init_state(_UTF1632EncodingInfo *ei __unused,
_UTF1632State *s)
{
memset(s, 0, sizeof(*s));
}
static int
_citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo *ei, wchar_t *pwc,
char **s, size_t n, _UTF1632State *psenc, size_t *nresult)
{
char *s0;
size_t result;
wchar_t wc = L'\0';
int chlenbak, endian, needlen;
s0 = *s;
if (s0 == NULL) {
_citrus_UTF1632_init_state(ei, psenc);
*nresult = 0; /* state independent */
return (0);
}
result = 0;
chlenbak = psenc->chlen;
refetch:
needlen = ((ei->mode & _MODE_UTF32) != 0 || chlenbak >= 2) ? 4 : 2;
while (chlenbak < needlen) {
if (n == 0)
goto restart;
psenc->ch[chlenbak++] = *s0++;
n--;
result++;
}
/* judge endian marker */
if ((ei->mode & _MODE_UTF32) == 0) {
/* UTF16 */
if (psenc->ch[0] == 0xFE && psenc->ch[1] == 0xFF) {
psenc->current_endian = _ENDIAN_BIG;
chlenbak = 0;
goto refetch;
} else if (psenc->ch[0] == 0xFF && psenc->ch[1] == 0xFE) {
psenc->current_endian = _ENDIAN_LITTLE;
chlenbak = 0;
goto refetch;
}
} else {
/* UTF32 */
if (psenc->ch[0] == 0x00 && psenc->ch[1] == 0x00 &&
psenc->ch[2] == 0xFE && psenc->ch[3] == 0xFF) {
psenc->current_endian = _ENDIAN_BIG;
chlenbak = 0;
goto refetch;
} else if (psenc->ch[0] == 0xFF && psenc->ch[1] == 0xFE &&
psenc->ch[2] == 0x00 && psenc->ch[3] == 0x00) {
psenc->current_endian = _ENDIAN_LITTLE;
chlenbak = 0;
goto refetch;
}
}
endian = ((ei->mode & _MODE_FORCE_ENDIAN) != 0 ||
psenc->current_endian == _ENDIAN_UNKNOWN) ? ei->preffered_endian :
psenc->current_endian;
/* get wc */
if ((ei->mode & _MODE_UTF32) == 0) {
/* UTF16 */
if (needlen == 2) {
switch (endian) {
case _ENDIAN_LITTLE:
wc = (psenc->ch[0] |
((wchar_t)psenc->ch[1] << 8));
break;
case _ENDIAN_BIG:
wc = (psenc->ch[1] |
((wchar_t)psenc->ch[0] << 8));
break;
default:
goto ilseq;
}
if (wc >= 0xD800 && wc <= 0xDBFF) {
/* surrogate high */
needlen = 4;
goto refetch;
}
} else {
/* surrogate low */
wc -= 0xD800; /* wc : surrogate high (see above) */
wc <<= 10;
switch (endian) {
case _ENDIAN_LITTLE:
if (psenc->ch[3] < 0xDC || psenc->ch[3] > 0xDF)
goto ilseq;
wc |= psenc->ch[2];
wc |= (wchar_t)(psenc->ch[3] & 3) << 8;
break;
case _ENDIAN_BIG:
if (psenc->ch[2]<0xDC || psenc->ch[2]>0xDF)
goto ilseq;
wc |= psenc->ch[3];
wc |= (wchar_t)(psenc->ch[2] & 3) << 8;
break;
default:
goto ilseq;
}
wc += 0x10000;
}
} else {
/* UTF32 */
switch (endian) {
case _ENDIAN_LITTLE:
wc = (psenc->ch[0] |
((wchar_t)psenc->ch[1] << 8) |
((wchar_t)psenc->ch[2] << 16) |
((wchar_t)psenc->ch[3] << 24));
break;
case _ENDIAN_BIG:
wc = (psenc->ch[3] |
((wchar_t)psenc->ch[2] << 8) |
((wchar_t)psenc->ch[1] << 16) |
((wchar_t)psenc->ch[0] << 24));
break;
default:
goto ilseq;
}
if (wc >= 0xD800 && wc <= 0xDFFF)
goto ilseq;
}
*pwc = wc;
psenc->chlen = 0;
*nresult = result;
*s = s0;
return (0);
ilseq:
*nresult = (size_t)-1;
psenc->chlen = 0;
return (EILSEQ);
restart:
*nresult = (size_t)-2;
psenc->chlen = chlenbak;
*s = s0;
return (0);
}
static int
_citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo *ei, char *s, size_t n,
wchar_t wc, _UTF1632State *psenc, size_t *nresult)
{
wchar_t wc2;
static const char _bom[4] = {
0x00, 0x00, 0xFE, 0xFF,
};
const char *bom = &_bom[0];
size_t cnt;
cnt = (size_t)0;
if (psenc->current_endian == _ENDIAN_UNKNOWN) {
if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
if (ei->mode & _MODE_UTF32)
cnt = 4;
else {
cnt = 2;
bom += 2;
}
if (n < cnt)
goto e2big;
memcpy(s, bom, cnt);
s += cnt, n -= cnt;
}
psenc->current_endian = ei->preffered_endian;
}
wc2 = 0;
if ((ei->mode & _MODE_UTF32)==0) {
/* UTF16 */
if (wc > 0xFFFF) {
/* surrogate */
if (wc > 0x10FFFF)
goto ilseq;
if (n < 4)
goto e2big;
cnt += 4;
wc -= 0x10000;
wc2 = (wc & 0x3FF) | 0xDC00;
wc = (wc>>10) | 0xD800;
} else {
if (n < 2)
goto e2big;
cnt += 2;
}
surrogate:
switch (psenc->current_endian) {
case _ENDIAN_BIG:
s[1] = wc;
s[0] = (wc >>= 8);
break;
case _ENDIAN_LITTLE:
s[0] = wc;
s[1] = (wc >>= 8);
break;
}
if (wc2 != 0) {
wc = wc2;
wc2 = 0;
s += 2;
goto surrogate;
}
} else {
/* UTF32 */
if (wc >= 0xD800 && wc <= 0xDFFF)
goto ilseq;
if (n < 4)
goto e2big;
cnt += 4;
switch (psenc->current_endian) {
case _ENDIAN_BIG:
s[3] = wc;
s[2] = (wc >>= 8);
s[1] = (wc >>= 8);
s[0] = (wc >>= 8);
break;
case _ENDIAN_LITTLE:
s[0] = wc;
s[1] = (wc >>= 8);
s[2] = (wc >>= 8);
s[3] = (wc >>= 8);
break;
}
}
*nresult = cnt;
return (0);
ilseq:
*nresult = (size_t)-1;
return (EILSEQ);
e2big:
*nresult = (size_t)-1;
return (E2BIG);
}
static void
parse_variable(_UTF1632EncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
const char *p;
p = var;
while (lenvar > 0) {
switch (*p) {
case 'B':
case 'b':
MATCH(big, ei->preffered_endian = _ENDIAN_BIG);
break;
case 'L':
case 'l':
MATCH(little, ei->preffered_endian = _ENDIAN_LITTLE);
break;
case 'i':
case 'I':
MATCH(internal, ei->preffered_endian = _ENDIAN_INTERNAL);
break;
case 's':
case 'S':
MATCH(swapped, ei->preffered_endian = _ENDIAN_SWAPPED);
break;
case 'F':
case 'f':
MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
break;
case 'U':
case 'u':
MATCH(utf32, ei->mode |= _MODE_UTF32);
break;
}
p++;
lenvar--;
}
}
static int
/*ARGSUSED*/
_citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
memset((void *)ei, 0, sizeof(*ei));
parse_variable(ei, var, lenvar);
ei->cur_max = ((ei->mode&_MODE_UTF32) == 0) ? 6 : 8;
/* 6: endian + surrogate */
/* 8: endian + normal */
if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
ei->preffered_endian = _ENDIAN_BIG;
}
return (0);
}
static void
/*ARGSUSED*/
_citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei __unused)
{
}
static __inline int
/*ARGSUSED*/
_citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei __unused,
_csid_t * __restrict csid, _index_t * __restrict idx, _wc_t wc)
{
*csid = 0;
*idx = (_index_t)wc;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei __unused,
_wc_t * __restrict wc, _csid_t csid, _index_t idx)
{
if (csid != 0)
return (EILSEQ);
*wc = (_wc_t)idx;
return (0);
}
static __inline int
/*ARGSUSED*/
_citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei __unused,
_UTF1632State * __restrict psenc, int * __restrict rstate)
{
*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
_STDENC_SDGEN_INCOMPLETE_CHAR;
return (0);
}
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(UTF1632);
_CITRUS_STDENC_DEF_OPS(UTF1632);
#include "citrus_stdenc_template.h"
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