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/*
* ISO-2022-KR
*/
/* Specification: RFC 1557 */
/* Note: CJK.INF says the SO designator needs to appear only once at the
beginning of a text, but to decrease the risk of ambiguities, when
producing ISO-2022-KR, we repeat the designator in every line containing
SO characters. RFC 1557 does not mandate this. */
#define ESC 0x1b
#define SO 0x0e
#define SI 0x0f
/*
* The state is composed of one of the following values
*/
#define STATE_ASCII 0
#define STATE_TWOBYTE 1
/*
* and one of the following values, << 8
*/
#define STATE2_NONE 0
#define STATE2_DESIGNATED_KSC5601 1
#define SPLIT_STATE \
unsigned int state1 = state & 0xff, state2 = state >> 8
#define COMBINE_STATE \
state = (state2 << 8) | state1
static int
iso2022_kr_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
{
state_t state = conv->istate;
SPLIT_STATE;
int count = 0;
unsigned char c;
for (;;) {
c = *s;
if (c == ESC) {
if (n < count+4)
goto none;
if (s[1] == '$') {
if (s[2] == ')') {
if (s[3] == 'C') {
state2 = STATE2_DESIGNATED_KSC5601;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
}
}
return RET_ILSEQ;
}
if (c == SO) {
if (state2 != STATE2_DESIGNATED_KSC5601)
return RET_ILSEQ;
state1 = STATE_TWOBYTE;
s++; count++;
if (n < count+1)
goto none;
continue;
}
if (c == SI) {
state1 = STATE_ASCII;
s++; count++;
if (n < count+1)
goto none;
continue;
}
break;
}
switch (state1) {
case STATE_ASCII:
if (c < 0x80) {
int ret = ascii_mbtowc(conv,pwc,s,1);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 1) abort();
#if 0 /* Accept ISO-2022-KR according to CJK.INF. */
if (*pwc == 0x000a || *pwc == 0x000d)
state2 = STATE2_NONE;
#endif
COMBINE_STATE;
conv->istate = state;
return count+1;
} else
return RET_ILSEQ;
case STATE_TWOBYTE:
if (n < count+2)
goto none;
if (state2 != STATE2_DESIGNATED_KSC5601) abort();
if (s[0] < 0x80 && s[1] < 0x80) {
int ret = ksc5601_mbtowc(conv,pwc,s,2);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 2) abort();
COMBINE_STATE;
conv->istate = state;
return count+2;
} else
return RET_ILSEQ;
default: abort();
}
none:
COMBINE_STATE;
conv->istate = state;
return RET_TOOFEW(count);
}
static int
iso2022_kr_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
{
state_t state = conv->ostate;
SPLIT_STATE;
unsigned char buf[2];
int ret;
/* Try ASCII. */
ret = ascii_wctomb(conv,buf,wc,1);
if (ret != RET_ILSEQ) {
if (ret != 1) abort();
if (buf[0] < 0x80) {
int count = (state1 == STATE_ASCII ? 1 : 2);
if (n < count)
return RET_TOOSMALL;
if (state1 != STATE_ASCII) {
r[0] = SI;
r += 1;
state1 = STATE_ASCII;
}
r[0] = buf[0];
if (wc == 0x000a || wc == 0x000d)
state2 = STATE2_NONE;
COMBINE_STATE;
conv->ostate = state;
return count;
}
}
/* Try KS C 5601-1992. */
ret = ksc5601_wctomb(conv,buf,wc,2);
if (ret != RET_ILSEQ) {
if (ret != 2) abort();
if (buf[0] < 0x80 && buf[1] < 0x80) {
int count = (state2 == STATE2_DESIGNATED_KSC5601 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
if (n < count)
return RET_TOOSMALL;
if (state2 != STATE2_DESIGNATED_KSC5601) {
r[0] = ESC;
r[1] = '$';
r[2] = ')';
r[3] = 'C';
r += 4;
state2 = STATE2_DESIGNATED_KSC5601;
}
if (state1 != STATE_TWOBYTE) {
r[0] = SO;
r += 1;
state1 = STATE_TWOBYTE;
}
r[0] = buf[0];
r[1] = buf[1];
COMBINE_STATE;
conv->ostate = state;
return count;
}
}
return RET_ILSEQ;
}
static int
iso2022_kr_reset (conv_t conv, unsigned char *r, int n)
{
state_t state = conv->ostate;
SPLIT_STATE;
(void)state2;
if (state1 != STATE_ASCII) {
if (n < 1)
return RET_TOOSMALL;
r[0] = SI;
/* conv->ostate = 0; will be done by the caller */
return 1;
} else
return 0;
}
#undef COMBINE_STATE
#undef SPLIT_STATE
#undef STATE2_DESIGNATED_KSC5601
#undef STATE2_NONE
#undef STATE_TWOBYTE
#undef STATE_ASCII
|
