Aegisub/subprojects/iconv/libiconv/loop_unicode.h

528 lines
17 KiB
C

/*
* Copyright (C) 1999-2003, 2005-2006, 2008 Free Software Foundation, Inc.
* This file is part of the GNU LIBICONV Library.
*
* The GNU LIBICONV Library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* The GNU LIBICONV Library is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
* If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
* Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* This file defines the conversion loop via Unicode as a pivot encoding. */
/* Attempt to transliterate wc. Return code as in xxx_wctomb. */
static int unicode_transliterate (conv_t cd, ucs4_t wc,
unsigned char* outptr, size_t outleft)
{
if (cd->oflags & HAVE_HANGUL_JAMO) {
/* Decompose Hangul into Jamo. Use double-width Jamo (contained
in all Korean encodings and ISO-2022-JP-2), not half-width Jamo
(contained in Unicode only). */
ucs4_t buf[3];
int ret = johab_hangul_decompose(cd,buf,wc);
if (ret != RET_ILUNI) {
/* we know 1 <= ret <= 3 */
state_t backup_state = cd->ostate;
unsigned char* backup_outptr = outptr;
size_t backup_outleft = outleft;
int i, sub_outcount;
for (i = 0; i < ret; i++) {
if (outleft == 0) {
sub_outcount = RET_TOOSMALL;
goto johab_hangul_failed;
}
sub_outcount = cd->ofuncs.xxx_wctomb(cd,outptr,buf[i],outleft);
if (sub_outcount <= RET_ILUNI)
goto johab_hangul_failed;
if (!(sub_outcount <= outleft)) abort();
outptr += sub_outcount; outleft -= sub_outcount;
}
return outptr-backup_outptr;
johab_hangul_failed:
cd->ostate = backup_state;
outptr = backup_outptr;
outleft = backup_outleft;
if (sub_outcount != RET_ILUNI)
return RET_TOOSMALL;
}
}
{
/* Try to use a variant, but postfix it with
U+303E IDEOGRAPHIC VARIATION INDICATOR
(cf. Ken Lunde's "CJKV information processing", p. 188). */
int indx = -1;
if (wc == 0x3006)
indx = 0;
else if (wc == 0x30f6)
indx = 1;
else if (wc >= 0x4e00 && wc < 0xa000)
indx = cjk_variants_indx[wc-0x4e00];
if (indx >= 0) {
for (;; indx++) {
ucs4_t buf[2];
unsigned short variant = cjk_variants[indx];
unsigned short last = variant & 0x8000;
variant &= 0x7fff;
variant += 0x3000;
buf[0] = variant; buf[1] = 0x303e;
{
state_t backup_state = cd->ostate;
unsigned char* backup_outptr = outptr;
size_t backup_outleft = outleft;
int i, sub_outcount;
for (i = 0; i < 2; i++) {
if (outleft == 0) {
sub_outcount = RET_TOOSMALL;
goto variant_failed;
}
sub_outcount = cd->ofuncs.xxx_wctomb(cd,outptr,buf[i],outleft);
if (sub_outcount <= RET_ILUNI)
goto variant_failed;
if (!(sub_outcount <= outleft)) abort();
outptr += sub_outcount; outleft -= sub_outcount;
}
return outptr-backup_outptr;
variant_failed:
cd->ostate = backup_state;
outptr = backup_outptr;
outleft = backup_outleft;
if (sub_outcount != RET_ILUNI)
return RET_TOOSMALL;
}
if (last)
break;
}
}
}
if (wc >= 0x2018 && wc <= 0x201a) {
/* Special case for quotation marks 0x2018, 0x2019, 0x201a */
ucs4_t substitute =
(cd->oflags & HAVE_QUOTATION_MARKS
? (wc == 0x201a ? 0x2018 : wc)
: (cd->oflags & HAVE_ACCENTS
? (wc==0x2019 ? 0x00b4 : 0x0060) /* use accents */
: 0x0027 /* use apostrophe */
) );
int outcount = cd->ofuncs.xxx_wctomb(cd,outptr,substitute,outleft);
if (outcount != RET_ILUNI)
return outcount;
}
{
/* Use the transliteration table. */
int indx = translit_index(wc);
if (indx >= 0) {
const unsigned int * cp = &translit_data[indx];
unsigned int num = *cp++;
state_t backup_state = cd->ostate;
unsigned char* backup_outptr = outptr;
size_t backup_outleft = outleft;
unsigned int i;
int sub_outcount;
for (i = 0; i < num; i++) {
if (outleft == 0) {
sub_outcount = RET_TOOSMALL;
goto translit_failed;
}
sub_outcount = cd->ofuncs.xxx_wctomb(cd,outptr,cp[i],outleft);
if (sub_outcount == RET_ILUNI)
/* Recursive transliteration. */
sub_outcount = unicode_transliterate(cd,cp[i],outptr,outleft);
if (sub_outcount <= RET_ILUNI)
goto translit_failed;
if (!(sub_outcount <= outleft)) abort();
outptr += sub_outcount; outleft -= sub_outcount;
}
return outptr-backup_outptr;
translit_failed:
cd->ostate = backup_state;
outptr = backup_outptr;
outleft = backup_outleft;
if (sub_outcount != RET_ILUNI)
return RET_TOOSMALL;
}
}
return RET_ILUNI;
}
#ifndef LIBICONV_PLUG
struct uc_to_mb_fallback_locals {
unsigned char* l_outbuf;
size_t l_outbytesleft;
int l_errno;
};
static void uc_to_mb_write_replacement (const char *buf, size_t buflen,
void* callback_arg)
{
struct uc_to_mb_fallback_locals * plocals =
(struct uc_to_mb_fallback_locals *) callback_arg;
/* Do nothing if already encountered an error in a previous call. */
if (plocals->l_errno == 0) {
/* Attempt to copy the passed buffer to the output buffer. */
if (plocals->l_outbytesleft < buflen)
plocals->l_errno = E2BIG;
else {
memcpy(plocals->l_outbuf, buf, buflen);
plocals->l_outbuf += buflen;
plocals->l_outbytesleft -= buflen;
}
}
}
struct mb_to_uc_fallback_locals {
conv_t l_cd;
unsigned char* l_outbuf;
size_t l_outbytesleft;
int l_errno;
};
static void mb_to_uc_write_replacement (const unsigned int *buf, size_t buflen,
void* callback_arg)
{
struct mb_to_uc_fallback_locals * plocals =
(struct mb_to_uc_fallback_locals *) callback_arg;
/* Do nothing if already encountered an error in a previous call. */
if (plocals->l_errno == 0) {
/* Attempt to convert the passed buffer to the target encoding. */
conv_t cd = plocals->l_cd;
unsigned char* outptr = plocals->l_outbuf;
size_t outleft = plocals->l_outbytesleft;
for (; buflen > 0; buf++, buflen--) {
ucs4_t wc = *buf;
int outcount;
if (outleft == 0) {
plocals->l_errno = E2BIG;
break;
}
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,wc,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
/* Handle Unicode tag characters (range U+E0000..U+E007F). */
if ((wc >> 7) == (0xe0000 >> 7))
goto outcount_zero;
/* Try transliteration. */
if (cd->transliterate) {
outcount = unicode_transliterate(cd,wc,outptr,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
}
if (cd->discard_ilseq) {
outcount = 0;
goto outcount_ok;
}
#ifndef LIBICONV_PLUG
else if (cd->fallbacks.uc_to_mb_fallback != NULL) {
struct uc_to_mb_fallback_locals locals;
locals.l_outbuf = outptr;
locals.l_outbytesleft = outleft;
locals.l_errno = 0;
cd->fallbacks.uc_to_mb_fallback(wc,
uc_to_mb_write_replacement,
&locals,
cd->fallbacks.data);
if (locals.l_errno != 0) {
plocals->l_errno = locals.l_errno;
break;
}
outptr = locals.l_outbuf;
outleft = locals.l_outbytesleft;
outcount = 0;
goto outcount_ok;
}
#endif
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,0xFFFD,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
plocals->l_errno = EILSEQ;
break;
outcount_ok:
if (outcount < 0) {
plocals->l_errno = E2BIG;
break;
}
#ifndef LIBICONV_PLUG
if (cd->hooks.uc_hook)
(*cd->hooks.uc_hook)(wc, cd->hooks.data);
#endif
if (!(outcount <= outleft)) abort();
outptr += outcount; outleft -= outcount;
outcount_zero: ;
}
plocals->l_outbuf = outptr;
plocals->l_outbytesleft = outleft;
}
}
#endif /* !LIBICONV_PLUG */
static size_t unicode_loop_convert (iconv_t icd,
const char* * inbuf, size_t *inbytesleft,
char* * outbuf, size_t *outbytesleft)
{
conv_t cd = (conv_t) icd;
size_t result = 0;
const unsigned char* inptr = (const unsigned char*) *inbuf;
size_t inleft = *inbytesleft;
unsigned char* outptr = (unsigned char*) *outbuf;
size_t outleft = *outbytesleft;
while (inleft > 0) {
state_t last_istate = cd->istate;
ucs4_t wc;
int incount;
int outcount;
incount = cd->ifuncs.xxx_mbtowc(cd,&wc,inptr,inleft);
if (incount < 0) {
if ((unsigned int)(-1-incount) % 2 == (unsigned int)(-1-RET_ILSEQ) % 2) {
/* Case 1: invalid input, possibly after a shift sequence */
incount = DECODE_SHIFT_ILSEQ(incount);
if (cd->discard_ilseq) {
switch (cd->iindex) {
case ei_ucs4: case ei_ucs4be: case ei_ucs4le:
case ei_utf32: case ei_utf32be: case ei_utf32le:
case ei_ucs4internal: case ei_ucs4swapped:
incount += 4; break;
case ei_ucs2: case ei_ucs2be: case ei_ucs2le:
case ei_utf16: case ei_utf16be: case ei_utf16le:
case ei_ucs2internal: case ei_ucs2swapped:
incount += 2; break;
default:
incount += 1; break;
}
goto outcount_zero;
}
#ifndef LIBICONV_PLUG
else if (cd->fallbacks.mb_to_uc_fallback != NULL) {
unsigned int incount2;
struct mb_to_uc_fallback_locals locals;
switch (cd->iindex) {
case ei_ucs4: case ei_ucs4be: case ei_ucs4le:
case ei_utf32: case ei_utf32be: case ei_utf32le:
case ei_ucs4internal: case ei_ucs4swapped:
incount2 = 4; break;
case ei_ucs2: case ei_ucs2be: case ei_ucs2le:
case ei_utf16: case ei_utf16be: case ei_utf16le:
case ei_ucs2internal: case ei_ucs2swapped:
incount2 = 2; break;
default:
incount2 = 1; break;
}
locals.l_cd = cd;
locals.l_outbuf = outptr;
locals.l_outbytesleft = outleft;
locals.l_errno = 0;
cd->fallbacks.mb_to_uc_fallback((const char*)inptr+incount, incount2,
mb_to_uc_write_replacement,
&locals,
cd->fallbacks.data);
if (locals.l_errno != 0) {
inptr += incount; inleft -= incount;
errno = locals.l_errno;
result = -1;
break;
}
incount += incount2;
outptr = locals.l_outbuf;
outleft = locals.l_outbytesleft;
result += 1;
goto outcount_zero;
}
#endif
inptr += incount; inleft -= incount;
errno = EILSEQ;
result = -1;
break;
}
if (incount == RET_TOOFEW(0)) {
/* Case 2: not enough bytes available to detect anything */
errno = EINVAL;
result = -1;
break;
}
/* Case 3: k bytes read, but only a shift sequence */
incount = DECODE_TOOFEW(incount);
} else {
/* Case 4: k bytes read, making up a wide character */
if (outleft == 0) {
cd->istate = last_istate;
errno = E2BIG;
result = -1;
break;
}
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,wc,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
/* Handle Unicode tag characters (range U+E0000..U+E007F). */
if ((wc >> 7) == (0xe0000 >> 7))
goto outcount_zero;
/* Try transliteration. */
result++;
if (cd->transliterate) {
outcount = unicode_transliterate(cd,wc,outptr,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
}
if (cd->discard_ilseq) {
outcount = 0;
goto outcount_ok;
}
#ifndef LIBICONV_PLUG
else if (cd->fallbacks.uc_to_mb_fallback != NULL) {
struct uc_to_mb_fallback_locals locals;
locals.l_outbuf = outptr;
locals.l_outbytesleft = outleft;
locals.l_errno = 0;
cd->fallbacks.uc_to_mb_fallback(wc,
uc_to_mb_write_replacement,
&locals,
cd->fallbacks.data);
if (locals.l_errno != 0) {
cd->istate = last_istate;
errno = locals.l_errno;
return -1;
}
outptr = locals.l_outbuf;
outleft = locals.l_outbytesleft;
outcount = 0;
goto outcount_ok;
}
#endif
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,0xFFFD,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
cd->istate = last_istate;
errno = EILSEQ;
result = -1;
break;
outcount_ok:
if (outcount < 0) {
cd->istate = last_istate;
errno = E2BIG;
result = -1;
break;
}
#ifndef LIBICONV_PLUG
if (cd->hooks.uc_hook)
(*cd->hooks.uc_hook)(wc, cd->hooks.data);
#endif
if (!(outcount <= outleft)) abort();
outptr += outcount; outleft -= outcount;
}
outcount_zero:
if (!(incount <= inleft)) abort();
inptr += incount; inleft -= incount;
}
*inbuf = (const char*) inptr;
*inbytesleft = inleft;
*outbuf = (char*) outptr;
*outbytesleft = outleft;
return result;
}
static size_t unicode_loop_reset (iconv_t icd,
char* * outbuf, size_t *outbytesleft)
{
conv_t cd = (conv_t) icd;
if (outbuf == NULL || *outbuf == NULL) {
/* Reset the states. */
memset(&cd->istate,'\0',sizeof(state_t));
memset(&cd->ostate,'\0',sizeof(state_t));
return 0;
} else {
size_t result = 0;
if (cd->ifuncs.xxx_flushwc) {
state_t last_istate = cd->istate;
ucs4_t wc;
if (cd->ifuncs.xxx_flushwc(cd, &wc)) {
unsigned char* outptr = (unsigned char*) *outbuf;
size_t outleft = *outbytesleft;
int outcount = cd->ofuncs.xxx_wctomb(cd,outptr,wc,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
/* Handle Unicode tag characters (range U+E0000..U+E007F). */
if ((wc >> 7) == (0xe0000 >> 7))
goto outcount_zero;
/* Try transliteration. */
result++;
if (cd->transliterate) {
outcount = unicode_transliterate(cd,wc,outptr,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
}
if (cd->discard_ilseq) {
outcount = 0;
goto outcount_ok;
}
#ifndef LIBICONV_PLUG
else if (cd->fallbacks.uc_to_mb_fallback != NULL) {
struct uc_to_mb_fallback_locals locals;
locals.l_outbuf = outptr;
locals.l_outbytesleft = outleft;
locals.l_errno = 0;
cd->fallbacks.uc_to_mb_fallback(wc,
uc_to_mb_write_replacement,
&locals,
cd->fallbacks.data);
if (locals.l_errno != 0) {
cd->istate = last_istate;
errno = locals.l_errno;
return -1;
}
outptr = locals.l_outbuf;
outleft = locals.l_outbytesleft;
outcount = 0;
goto outcount_ok;
}
#endif
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,0xFFFD,outleft);
if (outcount != RET_ILUNI)
goto outcount_ok;
cd->istate = last_istate;
errno = EILSEQ;
return -1;
outcount_ok:
if (outcount < 0) {
cd->istate = last_istate;
errno = E2BIG;
return -1;
}
#ifndef LIBICONV_PLUG
if (cd->hooks.uc_hook)
(*cd->hooks.uc_hook)(wc, cd->hooks.data);
#endif
if (!(outcount <= outleft)) abort();
outptr += outcount;
outleft -= outcount;
outcount_zero:
*outbuf = (char*) outptr;
*outbytesleft = outleft;
}
}
if (cd->ofuncs.xxx_reset) {
unsigned char* outptr = (unsigned char*) *outbuf;
size_t outleft = *outbytesleft;
int outcount = cd->ofuncs.xxx_reset(cd,outptr,outleft);
if (outcount < 0) {
errno = E2BIG;
return -1;
}
if (!(outcount <= outleft)) abort();
*outbuf = (char*) (outptr + outcount);
*outbytesleft = outleft - outcount;
}
memset(&cd->istate,'\0',sizeof(state_t));
memset(&cd->ostate,'\0',sizeof(state_t));
return result;
}
}