/*
	KON - Kanji ON Linux Console -
	Copyright (C) 1992, 1993 Takashi MANABE (manabe@tut.ac.jp)

	KON is free software; you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	KON 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 General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include	"big5con.h"

static u_int JISX0208(u_char ch1, u_char ch2)
{
    if (ch1 > 0x2A)
	return((ch2 - 0x41 + (ch1 - 0x26) * 96) << 5);
    else
	return((ch2 - 0x21 + (ch1 - 0x21) * 96) << 5);
}

static u_int GB2312(u_char ch1, u_char ch2)
{
    if (ch1 > 0x29)
	return(((ch1 - 0x27) * 94 + ch2 - 0x21) << 5);
    else
	return(((ch1 - 0x21) * 94 + ch2 - 0x21) << 5);
}

static u_int BIG5(u_char ch1, u_char ch2)
{
    if (ch2 < 0xA1)
	return(((ch1 - 0xA1) * 157 + ch2 - 0x40) << 5);
    else
	return(((ch1 - 0xA1) * 157 + 63 + ch2 - 0xA1) << 5);
}

static u_int KSC5601(u_char ch1, u_char ch2)
{
    if (ch1 > 0x2D)
	return((ch2 - 0x21 + (ch1 - 0x24) * 96) << 5);
    else
	return((ch2 - 0x21 + (ch1 - 0x21) * 96) << 5);
}

static u_int FldJISX0208(u_char ch1, u_char ch2)
{
    return(JISX0208(ch1&0x7F, ch2&0x7F));
}

static u_int FldKSC5601(u_char ch1, u_char ch2)
{
    return(KSC5601(ch1&0x7F, ch2&0x7F));
}

static u_int FldGB2312(u_char ch1, u_char ch2)
{
    return(GB2312(ch1&0x7F, ch2&0x7F));
}

struct fontRegs fSRegs[] = {
    /* latin1(French, Spanish, ...) */
    {    NULL, 0,      "ISO8859-1", NULL, 0, 0, 'B', 'A', 0},
    /* latin2 */
    {    NULL, 0,      "ISO8859-2", NULL, 0, 0, 'B', 'B', 0},
    /* latin3 */
    {    NULL, 0,      "ISO8859-3", NULL, 0, 0, 'B', 'C', 0},
    /* latin4 */
    {    NULL, 0,      "ISO8859-4", NULL, 0, 0, 'B', 'D', 0},
    /* Russian */
    {    NULL, 0,      "ISO8859-5", NULL, 0, 0, 'B', 'L', 0},
    /* Arabic */
    {    NULL, 0,      "ISO8859-6", NULL, 0, 0, 'B', 'G', 0},
    /* Greek */
    {    NULL, 0,      "ISO8859-7", NULL, 0, 0, 'B', 'F', 0},
    /* Hebrew */
    {    NULL, 0,      "ISO8859-8", NULL, 0, 0, 'B', 'H', 0},
    /* latin5 */
    {    NULL, 0,      "ISO8859-9", NULL, 0, 0, 'B', 'M', 0},
    /* Japanese */
    {    NULL, 0,"JISX0201.1976-0", NULL, 0, 0, 'J', 'I', 0},
    {    NULL, 0,             NULL, NULL, 0, 0,   0,   0, 0}
};

struct fontLoaderRegs fldSRegs[] = {
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,   0xFF},
    {       NULL,      0},
};

struct fontRegs fDRegs[] = {
    /* DF_GB2312 */
    {  GB2312, 0,  "GB2312.1980-0", NULL, 0, 0, 'A', 0, 0},
    /* DF_JISX0208 */
    {JISX0208, 0,"JISX0208.1983-0", NULL, 0, 0, 'B', 0, 0},
    /* DF_KSC5601 */
    { KSC5601, 0, "KSC5601.1987-0", NULL, 0, 0, 'C', 0, 0},
    /* DF_JISX0212 */
    {JISX0208, 0,       "JISX0212", NULL, 0, 0, 'D', 0, 0},
    /* DF_BIG5_0 */
    {    BIG5, 0,     "BIG5.HKU-0", NULL, 0, 0, '0', 0, 0},
    /* DF_BIG5_1 */
    {    BIG5, 0,     "BIG5-0", NULL, 0, 0, '1', 0, 0},
    {    NULL, 0,             NULL, NULL, 0, 0,   0, 0, 0}
};

struct fontLoaderRegs fldDRegs[] = {
    {  FldGB2312,      0},
    {FldJISX0208, 0x7424},
    { FldKSC5601, 0x7D7E},
    {FldJISX0208, 0x7424},
    {       BIG5,      0},
    {       BIG5, 0xfefe},
    {       NULL,      0}
};

int CodingByRegistry(char *reg)
{
    int i;

    i = 0;
    while (fSRegs[i].registry) {
	if (!strcasecmp(fSRegs[i].registry, reg))
	    return(i|CHR_SFLD);
	i ++;
    }
    i = 0;
    while (fDRegs[i].registry) {
	if (!strcasecmp(fDRegs[i].registry, reg))
	    return(i|CHR_DFLD);
	i ++;
    }
    return(-1);
}