minix/lib/libc/citrus/modules/citrus_utf7.c

574 lines
13 KiB
C
Raw Normal View History

/* $NetBSD: citrus_utf7.c,v 1.6 2013/05/28 16:57:56 joerg Exp $ */
/*-
* Copyright (c)2004, 2005 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>
#if defined(LIB_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_utf7.c,v 1.6 2013/05/28 16:57:56 joerg Exp $");
#endif /* LIB_SCCS and not lint */
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>
#include <wchar.h>
#include "citrus_namespace.h"
#include "citrus_types.h"
#include "citrus_module.h"
#include "citrus_ctype.h"
#include "citrus_stdenc.h"
#include "citrus_utf7.h"
/* ----------------------------------------------------------------------
* private stuffs used by templates
*/
typedef struct {
uint16_t cell[0x80];
#define EI_MASK UINT16_C(0xff)
#define EI_DIRECT UINT16_C(0x100)
#define EI_OPTION UINT16_C(0x200)
#define EI_SPACE UINT16_C(0x400)
} _UTF7EncodingInfo;
typedef struct {
unsigned int
mode: 1, /* whether base64 mode */
bits: 4, /* need to hold 0 - 15 */
cache: 22, /* 22 = BASE64_BIT + UTF16_BIT */
surrogate: 1; /* whether surrogate pair or not */
int chlen;
char ch[4]; /* BASE64_IN, 3 * 6 = 18, most closed to UTF16_BIT */
} _UTF7State;
typedef struct {
_UTF7EncodingInfo ei;
struct {
/* for future multi-locale facility */
_UTF7State s_mblen;
_UTF7State s_mbrlen;
_UTF7State s_mbrtowc;
_UTF7State s_mbtowc;
_UTF7State s_mbsrtowcs;
_UTF7State s_mbsnrtowcs;
_UTF7State s_wcrtomb;
_UTF7State s_wcsrtombs;
_UTF7State s_wcsnrtombs;
_UTF7State s_wctomb;
} states;
} _UTF7CTypeInfo;
#define _CEI_TO_EI(_cei_) (&(_cei_)->ei)
#define _CEI_TO_STATE(_cei_, _func_) (_cei_)->states.s_##_func_
#define _FUNCNAME(m) _citrus_UTF7_##m
#define _ENCODING_INFO _UTF7EncodingInfo
#define _CTYPE_INFO _UTF7CTypeInfo
#define _ENCODING_STATE _UTF7State
#define _ENCODING_MB_CUR_MAX(_ei_) 4
#define _ENCODING_IS_STATE_DEPENDENT 1
#define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
static __inline void
/*ARGSUSED*/
_citrus_UTF7_init_state(_UTF7EncodingInfo * __restrict ei,
_UTF7State * __restrict s)
{
/* ei appears to be unused */
_DIAGASSERT(s != NULL);
memset((void *)s, 0, sizeof(*s));
}
static __inline void
/*ARGSUSED*/
_citrus_UTF7_pack_state(_UTF7EncodingInfo * __restrict ei,
void *__restrict pspriv, const _UTF7State * __restrict s)
{
/* ei seem to be unused */
_DIAGASSERT(pspriv != NULL);
_DIAGASSERT(s != NULL);
memcpy(pspriv, (const void *)s, sizeof(*s));
}
static __inline void
/*ARGSUSED*/
_citrus_UTF7_unpack_state(_UTF7EncodingInfo * __restrict ei,
_UTF7State * __restrict s, const void * __restrict pspriv)
{
/* ei seem to be unused */
_DIAGASSERT(s != NULL);
_DIAGASSERT(pspriv != NULL);
memcpy((void *)s, pspriv, sizeof(*s));
}
static const char base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static const char direct[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789(),-./:?";
static const char option[] = "!\"#$%&';<=>@[]^_`{|}";
static const char spaces[] = " \t\r\n";
#define BASE64_BIT 6
#define UTF16_BIT 16
#define BASE64_MAX 0x3f
#define UTF16_MAX UINT16_C(0xffff)
#define UTF32_MAX UINT32_C(0x10ffff)
#define BASE64_IN '+'
#define BASE64_OUT '-'
#define SHIFT7BIT(c) ((c) >> 7)
#define ISSPECIAL(c) ((c) == '\0' || (c) == BASE64_IN)
#define FINDLEN(ei, c) \
(SHIFT7BIT((c)) ? -1 : (((ei)->cell[(c)] & EI_MASK) - 1))
#define ISDIRECT(ei, c) (!SHIFT7BIT((c)) && (ISSPECIAL((c)) || \
ei->cell[(c)] & (EI_DIRECT | EI_OPTION | EI_SPACE)))
#define ISSAFE(ei, c) (!SHIFT7BIT((c)) && (ISSPECIAL((c)) || \
(c < 0x80 && ei->cell[(c)] & (EI_DIRECT | EI_SPACE))))
/* surrogate pair */
#define SRG_BASE UINT32_C(0x10000)
#define HISRG_MIN UINT16_C(0xd800)
#define HISRG_MAX UINT16_C(0xdbff)
#define LOSRG_MIN UINT16_C(0xdc00)
#define LOSRG_MAX UINT16_C(0xdfff)
static int
_citrus_UTF7_mbtoutf16(_UTF7EncodingInfo * __restrict ei,
uint16_t * __restrict u16, const char ** __restrict s, size_t n,
_UTF7State * __restrict psenc, size_t * __restrict nresult)
{
_UTF7State sv;
const char *s0;
int i, done, len;
_DIAGASSERT(ei != NULL);
_DIAGASSERT(s != NULL && *s != NULL);
_DIAGASSERT(psenc != NULL);
s0 = *s;
sv = *psenc;
for (i = 0, done = 0; done == 0; i++) {
_DIAGASSERT(i <= psenc->chlen);
if (i == psenc->chlen) {
if (n-- < 1) {
*nresult = (size_t)-2;
*s = s0;
sv.chlen = psenc->chlen;
*psenc = sv;
return 0;
}
psenc->ch[psenc->chlen++] = *s0++;
}
if (SHIFT7BIT((int)psenc->ch[i]))
goto ilseq;
if (!psenc->mode) {
if (psenc->bits > 0 || psenc->cache > 0)
return EINVAL;
if (psenc->ch[i] == BASE64_IN) {
psenc->mode = 1;
} else {
if (!ISDIRECT(ei, (int)psenc->ch[i]))
goto ilseq;
*u16 = (uint16_t)psenc->ch[i];
done = 1;
continue;
}
} else {
if (psenc->ch[i] == BASE64_OUT && psenc->cache == 0) {
psenc->mode = 0;
*u16 = (uint16_t)BASE64_IN;
done = 1;
continue;
}
len = FINDLEN(ei, (int)psenc->ch[i]);
if (len < 0) {
if (psenc->bits >= BASE64_BIT)
return EINVAL;
psenc->mode = 0;
psenc->bits = psenc->cache = 0;
if (psenc->ch[i] != BASE64_OUT) {
if (!ISDIRECT(ei, (int)psenc->ch[i]))
goto ilseq;
*u16 = (uint16_t)psenc->ch[i];
done = 1;
}
} else {
psenc->cache =
(psenc->cache << BASE64_BIT) | len;
switch (psenc->bits) {
case 0: case 2: case 4: case 6: case 8:
psenc->bits += BASE64_BIT;
break;
case 10: case 12: case 14:
psenc->bits -= (UTF16_BIT - BASE64_BIT);
*u16 = (psenc->cache >> psenc->bits)
& UTF16_MAX;
done = 1;
break;
default:
return EINVAL;
}
}
}
}
if (psenc->chlen > i)
return EINVAL;
psenc->chlen = 0;
*nresult = (size_t)((*u16 == 0) ? 0 : s0 - *s);
*s = s0;
return 0;
ilseq:
*nresult = (size_t)-1;
return EILSEQ;
}
static int
_citrus_UTF7_mbrtowc_priv(_UTF7EncodingInfo * __restrict ei,
wchar_t * __restrict pwc, const char ** __restrict s, size_t n,
_UTF7State * __restrict psenc, size_t * __restrict nresult)
{
const char *s0;
uint32_t u32;
uint16_t hi, lo;
size_t siz, nr;
int err;
_DIAGASSERT(ei != NULL);
/* pwc may be null */
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
if (*s == NULL) {
_citrus_UTF7_init_state(ei, psenc);
*nresult = (size_t)_ENCODING_IS_STATE_DEPENDENT;
return 0;
}
s0 = *s;
if (psenc->surrogate) {
hi = (psenc->cache >> 2) & UTF16_MAX;
if (hi < HISRG_MIN || hi > HISRG_MAX)
return EINVAL;
siz = 0;
} else {
err = _citrus_UTF7_mbtoutf16(ei, &hi, &s0, n, psenc, &nr);
if (nr == (size_t)-1 || nr == (size_t)-2) {
*nresult = nr;
return err;
}
if (err != 0)
return err;
n -= nr;
siz = nr;
if (hi < HISRG_MIN || hi > HISRG_MAX) {
u32 = (uint32_t)hi;
goto done;
}
psenc->surrogate = 1;
}
err = _citrus_UTF7_mbtoutf16(ei, &lo, &s0, n, psenc, &nr);
if (nr == (size_t)-1 || nr == (size_t)-2) {
*nresult = nr;
return err;
}
if (err != 0)
return err;
hi -= HISRG_MIN;
lo -= LOSRG_MIN;
u32 = (hi << 10 | lo) + SRG_BASE;
siz += nr;
done:
*s = s0;
if (pwc != NULL)
*pwc = (wchar_t)u32;
if (u32 == (uint32_t)0) {
*nresult = (size_t)0;
_citrus_UTF7_init_state(ei, psenc);
} else {
*nresult = siz;
psenc->surrogate = 0;
}
return err;
}
static int
_citrus_UTF7_utf16tomb(_UTF7EncodingInfo * __restrict ei,
char * __restrict s, size_t n, uint16_t u16,
_UTF7State * __restrict psenc, size_t * __restrict nresult)
{
int bits, i;
_DIAGASSERT(ei != NULL);
_DIAGASSERT(psenc != NULL);
if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
return EINVAL;
if (ISSAFE(ei, u16)) {
if (psenc->mode) {
if (psenc->bits > 0) {
bits = BASE64_BIT - psenc->bits;
i = (psenc->cache << bits) & BASE64_MAX;
psenc->ch[psenc->chlen++] = base64[i];
psenc->bits = psenc->cache = 0;
}
if (u16 == BASE64_OUT || FINDLEN(ei, u16) >= 0)
psenc->ch[psenc->chlen++] = BASE64_OUT;
psenc->mode = 0;
}
if (psenc->bits != 0)
return EINVAL;
psenc->ch[psenc->chlen++] = (char)u16;
if (u16 == BASE64_IN)
psenc->ch[psenc->chlen++] = BASE64_OUT;
} else {
if (!psenc->mode) {
if (psenc->bits > 0)
return EINVAL;
psenc->ch[psenc->chlen++] = BASE64_IN;
psenc->mode = 1;
}
psenc->cache = (psenc->cache << UTF16_BIT) | u16;
bits = UTF16_BIT + psenc->bits;
psenc->bits = bits % BASE64_BIT;
while ((bits -= BASE64_BIT) >= 0) {
i = (psenc->cache >> bits) & BASE64_MAX;
psenc->ch[psenc->chlen++] = base64[i];
}
}
memcpy(s, psenc->ch, psenc->chlen);
*nresult = psenc->chlen;
psenc->chlen = 0;
return 0;
}
static int
_citrus_UTF7_wcrtomb_priv(_UTF7EncodingInfo * __restrict ei,
char * __restrict s, size_t n, wchar_t wchar,
_UTF7State * __restrict psenc, size_t * __restrict nresult)
{
uint32_t u32;
uint16_t u16[2];
int err, len, i;
size_t siz, nr;
_DIAGASSERT(ei != NULL);
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
_DIAGASSERT(nresult != NULL);
u32 = (uint32_t)wchar;
if (u32 <= UTF16_MAX) {
u16[0] = (uint16_t)u32;
len = 1;
} else if (u32 <= UTF32_MAX) {
u32 -= SRG_BASE;
u16[0] = (u32 >> 10) + HISRG_MIN;
u16[1] = ((uint16_t)(u32 & UINT32_C(0x3ff))) + LOSRG_MIN;
len = 2;
} else {
*nresult = (size_t)-1;
return EILSEQ;
}
siz = 0;
for (i = 0; i < len; ++i) {
err = _citrus_UTF7_utf16tomb(ei, s, n, u16[i], psenc, &nr);
if (err != 0)
return err; /* XXX: state has been modified */
s += nr;
n -= nr;
siz += nr;
}
*nresult = siz;
return 0;
}
static int
/* ARGSUSED */
_citrus_UTF7_put_state_reset(_UTF7EncodingInfo * __restrict ei,
char * __restrict s, size_t n, _UTF7State * __restrict psenc,
size_t * __restrict nresult)
{
int bits, pos;
_DIAGASSERT(ei != NULL);
_DIAGASSERT(s != NULL);
_DIAGASSERT(psenc != NULL);
_DIAGASSERT(nresult != NULL);
if (psenc->chlen != 0 || psenc->bits > BASE64_BIT || psenc->surrogate)
return EINVAL;
if (psenc->mode) {
if (psenc->bits > 0) {
if (n-- < 1)
return E2BIG;
bits = BASE64_BIT - psenc->bits;
pos = (psenc->cache << bits) & BASE64_MAX;
psenc->ch[psenc->chlen++] = base64[pos];
psenc->ch[psenc->chlen++] = BASE64_OUT;
psenc->bits = psenc->cache = 0;
}
psenc->mode = 0;
}
if (psenc->bits != 0)
return EINVAL;
if (n-- < 1)
return E2BIG;
_DIAGASSERT(n >= psenc->chlen);
*nresult = (size_t)psenc->chlen;
if (psenc->chlen > 0) {
memcpy(s, psenc->ch, psenc->chlen);
psenc->chlen = 0;
}
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_UTF7_stdenc_wctocs(_UTF7EncodingInfo * __restrict ei,
_csid_t * __restrict csid,
_index_t * __restrict idx, wchar_t wc)
{
/* ei seem to be unused */
_DIAGASSERT(csid != NULL);
_DIAGASSERT(idx != NULL);
*csid = 0;
*idx = (_index_t)wc;
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_UTF7_stdenc_cstowc(_UTF7EncodingInfo * __restrict ei,
wchar_t * __restrict wc,
_csid_t csid, _index_t idx)
{
/* ei seem to be unused */
_DIAGASSERT(wc != NULL);
if (csid != 0)
return EILSEQ;
*wc = (wchar_t)idx;
return 0;
}
static __inline int
/*ARGSUSED*/
_citrus_UTF7_stdenc_get_state_desc_generic(_UTF7EncodingInfo * __restrict ei,
_UTF7State * __restrict psenc,
int * __restrict rstate)
{
if (psenc->chlen == 0)
*rstate = _STDENC_SDGEN_INITIAL;
else
*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
return 0;
}
static void
/*ARGSUSED*/
_citrus_UTF7_encoding_module_uninit(_UTF7EncodingInfo *ei)
{
/* ei seems to be unused */
}
static int
/*ARGSUSED*/
_citrus_UTF7_encoding_module_init(_UTF7EncodingInfo * __restrict ei,
const void * __restrict var, size_t lenvar)
{
const char *s;
_DIAGASSERT(ei != NULL);
/* var may be null */
memset(ei, 0, sizeof(*ei));
#define FILL(str, flag) \
do { \
for (s = str; *s != '\0'; s++) \
ei->cell[*s & 0x7f] |= flag; \
} while (/*CONSTCOND*/0)
FILL(base64, (s - base64) + 1);
FILL(direct, EI_DIRECT);
FILL(option, EI_OPTION);
FILL(spaces, EI_SPACE);
return 0;
}
/* ----------------------------------------------------------------------
* public interface for ctype
*/
_CITRUS_CTYPE_DECLS(UTF7);
_CITRUS_CTYPE_DEF_OPS(UTF7);
#include "citrus_ctype_template.h"
/* ----------------------------------------------------------------------
* public interface for stdenc
*/
_CITRUS_STDENC_DECLS(UTF7);
_CITRUS_STDENC_DEF_OPS(UTF7);
#include "citrus_stdenc_template.h"