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/* Access functions for KS C 5601-1992 based encoding conversion.
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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 C 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 C 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. */
#ifndef _KSC5601_H
#define _KSC5601_H 1
#define KSC5601_HANGUL 2350
#define KSC5601_HANJA 4888
#define KSC5601_SYMBOL 986
#include <gconv.h>
#include <stdint.h>
/* Conversion table. */
extern const uint16_t ksc5601_hangul_to_ucs[KSC5601_HANGUL];
extern const uint16_t ksc5601_sym_to_ucs[];
extern const uint16_t ksc5601_sym_from_ucs[KSC5601_SYMBOL][2];
extern const uint16_t ksc5601_hanja_to_ucs[KSC5601_HANJA];
extern const uint16_t ksc5601_hanja_from_ucs[KSC5601_HANJA][2];
/*
static inline wchar_t
ksc5601_to_ucs4 (char **s, size_t avail)
*/
static inline wchar_t
ksc5601_to_ucs4 (uint16_t s)
{
unsigned char ch = s / 256;
unsigned char ch2;
int idx;
/* row 94(0x7e) and row 41(0x49) are user-defined area in KS C 5601 */
if (ch <= 0x20 || ch >= 0x7e || ch == 0x49)
return UNKNOWN_10646_CHAR;
ch2 = s % 256;
if (ch2 <= 0x20 || ch2 >= 0x7f)
return UNKNOWN_10646_CHAR;
idx = (ch - 0x21) * 94 + (ch2 - 0x21);
/* 1410 = 15 * 94 , 3760 = 40 * 94
Hangul in KS C 5601 : row 16 - row 40 */
if (idx >= 1410 && idx < 3760)
return ksc5601_hangul_to_ucs[idx-1410];
else if (idx > 3854)
/* Hanja : row 42 - row 93 : 3854 = 94 * (42-1) */
return ksc5601_hanja_to_ucs[idx-3854];
else
return ksc5601_sym_to_ucs[idx] ?: UNKNOWN_10646_CHAR;
}
static inline size_t
ucs4_to_ksc5601_hangul (wchar_t wch, uint16_t *s)
{
int l=0,m,u=KSC5601_HANGUL-1;
wchar_t try;
while (l <= u)
{
try = (wchar_t) ksc5601_hangul_to_ucs[m=(l+u)/2];
if (try > wch)
u = m - 1;
else if (try < wch)
l= m + 1;
else
{
*s = (uint16_t) ((m / 94) * 256 + m % 94 + 0x3021) ;
return 2;
}
}
return 0;
}
static inline size_t
ucs4_to_ksc5601_hanja (wchar_t wch, uint16_t *s)
{
int l=0,m,u=KSC5601_HANJA-1;
wchar_t try;
while (l <= u)
{
try = (wchar_t) ksc5601_hanja_from_ucs[m=(l+u)/2][0];
if (try > wch)
u=m-1;
else if (try < wch)
l = m + 1;
else
{
*s = ksc5601_hanja_from_ucs[m][1];
return 2;
}
}
return 0;
}
static inline size_t
ucs4_to_ksc5601_sym (wchar_t wch, uint16_t *s)
{
int l = 0;
int m;
int u = KSC5601_SYMBOL - 1;
wchar_t try;
while (l <= u)
{
m = (l + u) / 2;
try = ksc5601_sym_from_ucs[m][0];
if (try > wch)
u = m - 1;
else if (try < wch)
l = m + 1;
else
{
*s = ksc5601_sym_from_ucs[m][1];
return 2;
}
}
return 0;
}
/*
static inline size_t
ucs4_to_ksc5601 (wchar_t wch, char **s, size_t avail)
*/
static inline size_t
ucs4_to_ksc5601 (wchar_t ch, uint16_t *s)
{
*s = (uint16_t) UNKNOWN_10646_CHAR; /* FIXIT */
if (ch >= 0xac00 && ch <= 0xd7a3)
return ucs4_to_ksc5601_hangul (ch, s);
else if (ch >= 0x4e00 && ch <= 0x9fff || ch >= 0xf900 && ch <= 0xfa0b)
return ucs4_to_ksc5601_hanja (ch, s);
else
return ucs4_to_ksc5601_sym (ch, s);
}
#endif /* ksc5601.h */
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