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/*
* Copyright (C) 1999-2001 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., 59 Temple Place -
* Suite 330, Boston, MA 02111-1307, USA.
*/
/* This file defines the conversion loop via Unicode as a pivot encoding. */
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) {
ucs4_t wc;
int incount;
int outcount;
incount = cd->ifuncs.xxx_mbtowc(cd,&wc,inptr,inleft);
if (incount <= 0) {
if (incount == 0) {
/* Case 1: invalid input */
errno = EILSEQ;
result = -1;
break;
}
if (incount == -1) {
/* 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 = -1-incount;
} else {
/* Case 4: k bytes read, making up a wide character */
if (outleft == 0) {
errno = E2BIG;
result = -1;
break;
}
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,wc,outleft);
if (outcount != 0)
goto outcount_ok;
/* Try transliteration. */
result++;
if (cd->transliterate) {
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_ILSEQ) {
/* 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 <= 0)
goto johab_hangul_failed;
if (!(sub_outcount <= outleft)) abort();
outptr += sub_outcount; outleft -= sub_outcount;
}
goto char_done;
johab_hangul_failed:
cd->ostate = backup_state;
outptr = backup_outptr;
outleft = backup_outleft;
if (sub_outcount < 0) {
errno = E2BIG;
result = -1;
break;
}
}
}
{
/* 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 <= 0)
goto variant_failed;
if (!(sub_outcount <= outleft)) abort();
outptr += sub_outcount; outleft -= sub_outcount;
}
goto char_done;
variant_failed:
cd->ostate = backup_state;
outptr = backup_outptr;
outleft = backup_outleft;
if (sub_outcount < 0) {
errno = E2BIG;
result = -1;
break;
}
}
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 */
) );
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,substitute,outleft);
if (outcount != 0)
goto outcount_ok;
}
{
/* Use the transliteration table. */
int indx = translit_index(wc);
if (indx >= 0) {
const unsigned short * 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 <= 0)
goto translit_failed;
if (!(sub_outcount <= outleft)) abort();
outptr += sub_outcount; outleft -= sub_outcount;
}
goto char_done;
translit_failed:
cd->ostate = backup_state;
outptr = backup_outptr;
outleft = backup_outleft;
if (sub_outcount < 0) {
errno = E2BIG;
result = -1;
break;
}
}
}
}
outcount = cd->ofuncs.xxx_wctomb(cd,outptr,0xFFFD,outleft);
if (outcount != 0)
goto outcount_ok;
errno = EILSEQ;
result = -1;
break;
outcount_ok:
if (outcount < 0) {
errno = E2BIG;
result = -1;
break;
}
if (!(outcount <= outleft)) abort();
outptr += outcount; outleft -= outcount;
char_done:
;
}
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 {
if (cd->ofuncs.xxx_reset) {
int outcount =
cd->ofuncs.xxx_reset(cd, (unsigned char *) *outbuf, *outbytesleft);
if (outcount < 0) {
errno = E2BIG;
return -1;
}
*outbuf += outcount; *outbytesleft -= outcount;
}
memset(&cd->istate,'\0',sizeof(state_t));
memset(&cd->ostate,'\0',sizeof(state_t));
return 0;
}
}