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/*
* sbcs.c - routines to handle single-byte character sets.
*/
#include "charset.h"
#include "internal.h"
/*
* The charset_spec for any single-byte character set should
* provide read_sbcs() as its read function, and its `data' field
* should be a wchar_t string constant containing the 256 entries
* of the translation table.
*/
long int sbcs_to_unicode(const struct sbcs_data *sd, long int input_chr)
{
return sd->sbcs2ucs[input_chr];
}
void read_sbcs(charset_spec const *charset, long int input_chr,
charset_state *state,
void (*emit)(void *ctx, long int output), void *emitctx)
{
const struct sbcs_data *sd = charset->data;
UNUSEDARG(state);
emit(emitctx, sbcs_to_unicode(sd, input_chr));
}
long int sbcs_from_unicode(const struct sbcs_data *sd, long int input_chr)
{
int i, j, k, c;
/*
* Binary-search in the ucs2sbcs table.
*/
i = -1;
j = sd->nvalid;
while (i+1 < j) {
k = (i+j)/2;
c = sd->ucs2sbcs[k];
if (input_chr < (long int)sd->sbcs2ucs[c])
j = k;
else if (input_chr > (long int)sd->sbcs2ucs[c])
i = k;
else {
return c;
}
}
return ERROR;
}
int write_sbcs(charset_spec const *charset, long int input_chr,
charset_state *state,
void (*emit)(void *ctx, long int output), void *emitctx)
{
const struct sbcs_data *sd = charset->data;
long int ret;
UNUSEDARG(state);
if (input_chr == -1)
return TRUE; /* stateless; no cleanup required */
ret = sbcs_from_unicode(sd, input_chr);
if (ret == ERROR)
return FALSE;
emit(emitctx, ret);
return TRUE;
}
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