/*
	db24fontx.c

	code: SASANO Takayoshi
	---- public domain, no warranty.

	[charset=UTF-8]

	●概要

	p1.exeのフォントファイル(db24hk.pat, db24k1.pat, db24k2.pat)を
	FONTX2形式に変換する。
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* FONTX2 header */
#define CODETYPE_ASCII	0
#define	CODETYPE_KANJI	1

/* common */
typedef struct {
	unsigned char	identifier[6];
	unsigned char	fontname[8];
	unsigned char	xsize;
	unsigned char	ysize;
	unsigned char	codetype;
} __attribute__((packed)) FONTX2_HEADER;

/* ascii */
typedef struct {
	FONTX2_HEADER	h;

	unsigned char	d[1];
} __attribute__((packed)) FONTX2_ASCII;

/* sjis */
typedef struct {
	FONTX2_HEADER	h;

	unsigned char	tnum;
	unsigned char	d[1];
} __attribute__((packed)) FONTX2_KANJI;

typedef	struct {
	unsigned short	start;
	unsigned short	end;
} __attribute__((packed)) FONTX2_CODETABLE;

static	FONTX2_CODETABLE	CodeTable_SJIS[] = {
	{0x8140, 0x817e}, {0x8180, 0x81ac},	/* symbol */
	{0x81b8, 0x81bf}, {0x81c8, 0x81ce},
	{0x81da, 0x81e8}, {0x81f0, 0x81f7},
			  {0x81fc, 0x81fc},
	{0x824f, 0x8258},			/* number */
	{0x8260, 0x8279},			/* alphabet (large) */
			  {0x8281, 0x829a},	/* alphabet (small) */
			  {0x829f, 0x82f1},	/* hiragana */
	{0x8340, 0x837e}, {0x8380, 0x8396},	/* katakana */
			  {0x839f, 0x83b6},	/* greek (large) */
			  {0x83bf, 0x83d6},	/* greek (small) */
	{0x8440, 0x8460},			/* russian (large) */
	{0x8470, 0x847e}, {0x8480, 0x8491},	/* russian (small) */
	{0x8740, 0x875d},			/* symbol2 */
	{0x875f, 0x8775}, {0x8780, 0x879c},
			  {0x889f, 0x88fc},	/* kanji (JIS1) */
	{0x8940, 0x897e}, {0x8980, 0x89fc},
	{0x8a40, 0x8a7e}, {0x8a80, 0x8afc},
	{0x8b40, 0x8b7e}, {0x8b80, 0x8bfc},
	{0x8c40, 0x8c7e}, {0x8c80, 0x8cfc},
	{0x8d40, 0x8d7e}, {0x8d80, 0x8dfc},
	{0x8e40, 0x8e7e}, {0x8e80, 0x8efc},
	{0x8f40, 0x8f7e}, {0x8f80, 0x8ffc},
	{0x9040, 0x907e}, {0x9080, 0x90fc},
	{0x9140, 0x917e}, {0x9180, 0x91fc},
	{0x9240, 0x927e}, {0x9280, 0x92fc},
	{0x9340, 0x937e}, {0x9380, 0x93fc},
	{0x9440, 0x947e}, {0x9480, 0x94fc},
	{0x9540, 0x957e}, {0x9580, 0x95fc},
	{0x9640, 0x967e}, {0x9680, 0x96fc},
	{0x9740, 0x977e}, {0x9780, 0x97fc},
	{0x9840, 0x9872},
			  {0x989f, 0x98fc},	/* kanji (JIS2) */
	{0x9940, 0x997e}, {0x9980, 0x99fc},
	{0x9a40, 0x9a7e}, {0x9a80, 0x9afc},
	{0x9b40, 0x9b7e}, {0x9b80, 0x9bfc},
	{0x9c40, 0x9c7e}, {0x9c80, 0x9cfc},
	{0x9d40, 0x9d7e}, {0x9d80, 0x9dfc},
	{0x9e40, 0x9e7e}, {0x9e80, 0x9efc},
	{0x9f40, 0x9f7e}, {0x9f80, 0x9ffc},

	{0xe040, 0xe07e}, {0xe080, 0xe0fc},
	{0xe140, 0xe17e}, {0xe180, 0xe1fc},
	{0xe240, 0xe27e}, {0xe280, 0xe2fc},
	{0xe340, 0xe37e}, {0xe380, 0xe3fc},
	{0xe440, 0xe47e}, {0xe480, 0xe4fc},
	{0xe540, 0xe57e}, {0xe580, 0xe5fc},
	{0xe640, 0xe67e}, {0xe680, 0xe6fc},
	{0xe740, 0xe77e}, {0xe780, 0xe7fc},
	{0xe840, 0xe87e}, {0xe880, 0xe8fc},
	{0xe940, 0xe97e}, {0xe980, 0xe9fc},
	{0xea40, 0xea7e}, {0xea80, 0xeaa2},
};

/* data buffer (in/out) */
#define	BUFFERSIZE	(2048 * 1024)
static	char	InData_kanji[BUFFERSIZE];
static	char	InData_ascii[BUFFERSIZE];
static	char	OutData[BUFFERSIZE];
static	char	FontName[] = "P1GOTH";

/* SJIS -> JIS */
static	int	_mbcjmstojis(int jms)
{
	int	low, high;

	high = (jms >> 8) & 0xff;
	low  =  jms       & 0xff;

	if (low < 0x9f) {
		if (high < 0xa0) {
			high -= 0x81;
			high *= 2;
			high += 0x21;
		} else {
			high -= 0xe0;
			high *= 2;
			high += 0x5f;
		}
			
		if (low > 0x7f) low--;
		low -= 0x1f;
	} else {
		if (high < 0xa0) {
			high -= 0x81;
			high *= 2;
			high += 0x22;
		} else {
			high -= 0xe0;
			high *= 2;
			high += 0x60;
		}

		low -= 0x7e;
	}

	return (high << 8) | low;
}

/* get kanji font pointer */
static	unsigned char	*get_kanji_pointer(int sjis)
{
	int	kuten, ku, ten;

	kuten = _mbcjmstojis(sjis) - 0x2020;
	ku  = ((kuten >> 8) & 0xff) - 1;
	ten = ( kuten       & 0xff) - 1;

	return InData_kanji + ((ku * 94) + ten) * 72;
}

/* copy CodeTable */
static	char	*copy_table(char *dst, FONTX2_CODETABLE *src, int entry)
{
	int	i;

	/* table must be little-endian */
	for (i = 0; i < entry; i++) {
		*dst++ = src[i].start & 0xff;
		*dst++ = (src[i].start >> 8) & 0xff;
		*dst++ = src[i].end & 0xff;
		*dst++ = (src[i].end >> 8) & 0xff;
	}

	return dst;
}

/* convert (Kanji) */
static	void	convert_kanji(void)
{
	int	i, tnum, sjis, chr;
	unsigned char	*d;
	FILE	*fp;
	FONTX2_KANJI	*f;

	memset(OutData, 0, sizeof(OutData));
	f = (FONTX2_KANJI *)OutData;
	tnum = sizeof(CodeTable_SJIS) / sizeof(FONTX2_CODETABLE);

	/* create header */
	strncpy(f->h.identifier, "FONTX2", sizeof(f->h.identifier));
	strncpy(f->h.fontname, FontName, sizeof(f->h.fontname));
	for (i = 0; i < sizeof(f->h.fontname); i++) {
		if (f->h.fontname[i] < 0x20) f->h.fontname[i] = 0x20;
	}
	f->h.xsize = 24;
	f->h.ysize = 24;
	f->h.codetype = CODETYPE_KANJI;
	f->tnum = tnum;

	/* make CodeTable */
	d = f->d;
	d = copy_table(d, CodeTable_SJIS, tnum);
	chr = 0;

	/* convert font */
	for (i = 0; i < tnum; i++) {
		for (sjis = CodeTable_SJIS[i].start;
		     sjis <= CodeTable_SJIS[i].end; sjis++, chr++) {
			memcpy(d, get_kanji_pointer(sjis), 72);
			d += 72;
		}
	}

	/* save result */
	fp = fopen("jpnzn24x.p1g", "wb");
	if (fp != NULL) {
		fwrite(OutData, 1,
		       (sizeof(FONTX2_HEADER) +
			tnum * sizeof(FONTX2_CODETABLE) +
			72 * chr + 1), fp);
	}
	fclose(fp);

	return;
}

/* get ascii font pointer */
static	unsigned char	*get_ascii_pointer(int ascii)
{
	return InData_ascii + 48 * ascii;
}

/* convert (ASCII) */
static	void	convert_ascii(void)
{
	int	i, j;
	FILE	*fp;
	FONTX2_ASCII	*f;
	unsigned char *p;

	memset(OutData, 0, sizeof(OutData));
	f = (FONTX2_ASCII *)OutData;

	/* create header */
	strncpy(f->h.identifier, "FONTX2", sizeof(f->h.identifier));
	strncpy(f->h.fontname, FontName, sizeof(f->h.fontname));
	for (i = 0; i < sizeof(f->h.fontname); i++) {
		if (f->h.fontname[i] < 0x20) f->h.fontname[i] = 0x20;
	}
        f->h.xsize = 24 / 2;
        f->h.ysize = 24;
	f->h.codetype = CODETYPE_ASCII;

	/* convert font (ASCII, 0x00-0xff) */
	for (i = 0x000; i < 0x100; i++) {
		p = get_ascii_pointer(i);

		for (j = 0; j < 24; j++) {
			f->d[48 * i + j * 2 + 0] = *p++ & 0xff;
			f->d[48 * i + j * 2 + 1] = *p++ & 0xf0;
		}
	}

	/* save result */
	fp = fopen("jpnhn24x.p1g", "wp");
	if (fp != NULL) {
		fwrite(OutData, 1, sizeof(FONTX2_HEADER) + 256 * 48, fp);
	}
	fclose(fp);

	return;
}

/* file load */
struct loadblock {
	char	*filename;
	int	loadchar;
	int	fileoffset;
	int	memoffset;
	char	*buffer;
	int	glyphbyte;
};

struct loadblock	blk[] = {
	{"db24hi.pat",   94,    0,    0, InData_kanji, 72},
	{"db24hi.pat",   14,   94,   94, InData_kanji, 72},
	{"db24hi.pat",    8,  108,  119, InData_kanji, 72},
	{"db24hi.pat",    7,  116,  135, InData_kanji, 72},
	{"db24hi.pat",   15,  123,  153, InData_kanji, 72},
	{"db24hi.pat",    8,  138,  175, InData_kanji, 72},
	{"db24hi.pat",    1,  146,  187, InData_kanji, 72},
	{"db24hi.pat",   10,  147,  203, InData_kanji, 72},
	{"db24hi.pat",   26,  157,  220, InData_kanji, 72},
	{"db24hi.pat",   26,  183,  252, InData_kanji, 72},
	{"db24hi.pat",   83,  209,  282, InData_kanji, 72},
	{"db24hi.pat",   86,  292,  376, InData_kanji, 72},
	{"db24hi.pat",   24,  378,  470, InData_kanji, 72},
	{"db24hi.pat",   24,  402,  502, InData_kanji, 72},
	{"db24hi.pat",   33,  426,  564, InData_kanji, 72},
	{"db24hi.pat",   33,  459,  612, InData_kanji, 72},
	{"db24hi.pat",   30,  492, 1128, InData_kanji, 72},
	{"db24hi.pat",   23,  522, 1159, InData_kanji, 72},
	{"db24hi.pat",   29,  545, 1191, InData_kanji, 72},
	{"db24k1.pat", 2965,    0, 1410, InData_kanji, 72},
	{"db24k2.pat", 3388,    0, 4418, InData_kanji, 72},
	{"db24hk.pat",   96,    0,   32, InData_ascii, 48},
	{"db24hk.pat",   64,   96,  160, InData_ascii, 48},
};

static	int	loadfile(char *filename, int filesize, int fileoffset, int memoffset, char *buf)
{
	int	i, c;
	FILE	*fp;

	fp = fopen(filename, "r");
	if (fp == NULL) {
		printf("loadfile: %s open error\n", filename);
		return -1;
	}

	fseek(fp, fileoffset, SEEK_SET);
	for (i = 0; i < filesize; i++) {
		c = fgetc(fp);
		buf[i + memoffset] = (c == EOF) ? 0xff : c;
	}

	fclose(fp);

	return 0;
}

static	int	load_font(void)
{
	int	i;

	memset(InData_kanji, ~0, sizeof(InData_kanji));
	memset(InData_ascii,  0, sizeof(InData_ascii));

	for (i = 0; i < sizeof(blk) / sizeof(struct loadblock); i++) {
		if (loadfile(blk[i].filename,
			     blk[i].glyphbyte * blk[i].loadchar,
			     blk[i].glyphbyte * blk[i].fileoffset,
			     blk[i].glyphbyte * blk[i].memoffset,
			     blk[i].buffer) < 0) return -1;
	}

	return 0;
}

/* entry */
int	main(int argc, char *argv[])
{
	load_font();

	convert_ascii();
	convert_kanji();

	return EXIT_SUCCESS;
}