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/*
* Unicode Conversion Library (Shift_JIS to UTF-16)
* 1999-2004 by yoshidam
*
*/
#ifdef USE_SJIS
#include <string.h>
#include "uconv.h"
#ifdef USE_WIN32API
# include <windows.h>
# define SJIS_CODEPAGE 932
#else
# include "s2u.h"
#endif
#include "ustring.h"
#define REPLACEMENT_CHAR '?'
static unsigned long
call_unknown_s_conv(UString* u,
unknown_sjis unknown_s_conv,
const unsigned char* s, int len) {
VALUE ret;
unsigned char us[3];
int i;
if (unknown_s_conv == NULL)
return REPLACEMENT_CHAR;
for (i = 0; i < len && i < sizeof(us) - 1; i++)
us[i] = s[i];
us[i] = '\0';
ret = unknown_s_conv(us);
if (TYPE(ret) != T_FIXNUM) {
UStr_free(u);
rb_exc_raise(ret);
}
return FIX2INT(ret);
}
static void
append_uchar(UString* u, unsigned long sc) {
if (sc >= 0x10000) {
unsigned int high = ((sc - 0x10000) >> 10) | 0xd800;
unsigned int low = (sc & 1023) | 0xdc00;
UStr_addChar4(u, high & 0xff, high >> 8, low & 0xff, low >> 8);
}
else
UStr_addChar2(u, sc & 0xff, sc >> 8);
}
int
s2u_conv2(const unsigned char* s, UString* u,
unknown_sjis unknown_s_conv,
unknown_sjis s2u_hook)
{
int i;
int len = strlen((char*)s);
UStr_alloc(u);
for (i = 0; i < len; i++) {
unsigned long sc = 0;
int clen = 0;
if (s2u_hook != NULL) {
VALUE ret;
unsigned char sstr[3];
if (s[i] >= 0xa0 && s[i] <= 0xdf) { /* JIS X 0201 kana */
sstr[0] = s[i]; sstr[1] = '\0';
}
else if (i < len - 1 &&
s[i] >= 0x80 && s[i] <= 0xfc &&
s[i + 1] >= 0x40 && s[i + 1] <= 0xfc && s[i + 1] != 0x7f) {
sstr[0] = s[i]; sstr[1] = s[i+1]; sstr[2] = '\0';
clen = 1;
}
else {
sstr[0] = s[i]; sstr[1] = '\0';
}
if ((ret = s2u_hook(sstr)) != Qnil) {
if (TYPE(ret) != T_FIXNUM) {
UStr_free(u);
rb_exc_raise(ret);
}
sc = FIX2INT(ret);
if (sc == 0)
sc = call_unknown_s_conv(u, unknown_s_conv, s + i, clen + 1);
append_uchar(u, sc);
i += clen;
continue;
}
}
clen = 0;
if (s[i] < 0x80) { /* ASCII */
sc = s[i];
}
else if (s[i] > 0xa0 && s[i] <= 0xdf) { /* JIS X 0201 kana */
sc = 0xff00 | (s[i] - 0x40);
}
else if (i < len - 1 &&
s[i] <= 0xfc &&
s[i + 1] >= 0x40 && s[i + 1] <= 0xfc && s[i + 1] != 0x7f) {
/* JIX X 0208 */
#ifdef USE_WIN32API
unsigned char ustr[sizeof(WCHAR)*2];
int ulen = MultiByteToWideChar(SJIS_CODEPAGE, MB_PRECOMPOSED, s + i, 2,
(LPWSTR)ustr, sizeof(ustr)/sizeof(WCHAR));
if (ulen == 1)
sc = ustr[0] | (ustr[1] << 8);
else if (ulen == 2) {
/* surrogate pair ? */
}
#else
int hi = s[i];
int low = s[i + 1];
int key;
if (hi >= 0xe0)
key = (hi - 0xc1)*188;
else
key = (hi - 0x81)*188;
if (low >= 0x80)
key += low - 0x41;
else
key += low - 0x40;
if (key < sizeof(s2u_tbl)/sizeof(unsigned short))
sc = s2u_tbl[key];
#endif /* USE_WIN32API */
clen = 1;
}
if (sc == 0)
sc = call_unknown_s_conv(u, unknown_s_conv, s + i, clen + 1);
append_uchar(u, sc);
i += clen;
}
return u->len;
}
#endif /* USE_SJIS */
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