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/*
* shiftjis.c - multibyte encoding of Shift-JIS
*/
#ifndef ENUM_CHARSETS
#include "charset.h"
#include "internal.h"
/*
* Shift-JIS has no associated data, so `charset' may be ignored.
*/
static void read_sjis(charset_spec const *charset, long int input_chr,
charset_state *state,
void (*emit)(void *ctx, long int output), void *emitctx)
{
UNUSEDARG(charset);
/*
* For reading Shift-JIS, state->s0 simply contains the single
* stored lead byte when we are half way through a double-byte
* character, or 0 if we aren't.
*/
if (state->s0 == 0) {
if ((input_chr >= 0x81 && input_chr <= 0x9F) ||
(input_chr >= 0xE0 && input_chr <= 0xEF)) {
/*
* Lead byte. Just store it.
*/
state->s0 = input_chr;
} else {
/*
* Anything else we translate through JIS X 0201.
*/
if (input_chr == 0x5C)
input_chr = 0xA5;
else if (input_chr == 0x7E)
input_chr = 0x203E;
else if (input_chr >= 0xA1 && input_chr <= 0xDF)
input_chr += 0xFF61 - 0xA1;
else if (input_chr < 0x80)
/* do nothing */;
else
input_chr = ERROR;
emit(emitctx, input_chr);
}
} else {
/*
* We have a stored lead byte. We expect a valid followup
* byte.
*/
if (input_chr >= 0x40 && input_chr <= 0xFC && input_chr != 0x7F) {
int r, c;
r = state->s0;
if (r >= 0xE0) r -= (0xE0 - 0xA0);
r -= 0x81;
c = input_chr;
if (c > 0x7F) c--;
c -= 0x40;
r *= 2;
if (c >= 94)
r++, c -= 94;
emit(emitctx, jisx0208_to_unicode(r, c));
} else {
emit(emitctx, ERROR);
}
state->s0 = 0;
}
}
/*
* Shift-JIS is a stateless multi-byte encoding (in the sense that
* just after any character has been completed, the state is always
* the same); hence when writing it, there is no need to use the
* charset_state.
*/
static bool write_sjis(charset_spec const *charset, long int input_chr,
charset_state *state,
void (*emit)(void *ctx, long int output), void *emitctx)
{
UNUSEDARG(charset);
UNUSEDARG(state);
if (input_chr == -1)
return true; /* stateless; no cleanup required */
if (input_chr < 0x80 && input_chr != 0x5C && input_chr != 0x7E) {
emit(emitctx, input_chr);
return true;
} else if (input_chr == 0xA5) {
emit(emitctx, 0x5C);
return true;
} else if (input_chr == 0x203E) {
emit(emitctx, 0x7E);
return true;
} else if (input_chr >= 0xFF61 && input_chr <= 0xFF9F) {
emit(emitctx, input_chr - (0xFF61 - 0xA1));
return true;
} else {
int r, c;
if (unicode_to_jisx0208(input_chr, &r, &c)) {
c += 94 * (r % 2);
r /= 2;
r += 0x81;
if (r >= 0xA0) r += 0xE0 - 0xA0;
c += 0x40;
if (c >= 0x7F) c++;
emit(emitctx, r);
emit(emitctx, c);
return true;
} else {
return false;
}
}
}
const charset_spec charset_CS_SHIFT_JIS = {
CS_SHIFT_JIS, read_sjis, write_sjis, NULL
};
#else /* ENUM_CHARSETS */
ENUM_CHARSET(CS_SHIFT_JIS)
#endif /* ENUM_CHARSETS */
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