/* vi: set sw=4 ts=4: */
/*
 * KON2 - Kanji ON Console -
 * Copyright (C) 1992-1996 Takashi MANABE (manabe@papilio.tutics.tut.ac.jp)
 *
 * CCE - Console Chinese Environment -
 * Copyright (C) 1998-2003 Rui He (rhe@3eti.com)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 */

#include	<stdio.h>
#include	<stdlib.h>
#include	<unistd.h>
#include	<sys/types.h>
#include	<string.h>
#include	<fcntl.h>

#include    "defs.h"
#include	"convert.h"
#include	"font.h"
#include	"getcap.h"
#include	"errors.h"

#ifdef HAVE_SYS_MMAN_H
#include 	<sys/mman.h>
#endif

#if !defined(__FONT_UTILITIES__) && defined(SUPPORT_FREETYPE_FONT)
#include	"ftfont.h"
#endif

FontRegs *dbFReg, *sbFReg;

#define USE_MMAP

int fontwidth, fontheight, fontbytes; /* for english chars */
int fontbytes2; /* for Chinese chars  32(16x16) or 72(24x24) */

int LoadBinFont(char *pathName);
int LoadX11Font(char *pathName);

static u_int GB2312(u_char ch1, u_char ch2)
{
	
    ch1 &= 0x7F;  /* - 0x80 */
    ch2 &= 0x7F;  /* - 0x80 A0A0 - 8080=2020 */

#ifdef SAVE_FONT_SPACE
    if (ch1 > 0x29) /* 0x2Axx-0x2Fxx not used */
        return(((ch1 - 0x27) * 94 + ch2 - 0x21) * fontbytes2 );  /* 24 * 24, 72 bytes  */
    else
        return(((ch1 - 0x21) * 94 + ch2 - 0x21) * fontbytes2 );
#else
	return (((ch1 - 0x21) * 94 + ch2 - 0x21) * fontbytes2 );
#endif
	
}

static u_int GBK(u_char ch1, u_char ch2)
{
	ch1 &= 0x7F;  /* 0x81-0xFE */
	return (( (ch1-1) * 192 + ch2 - 0x40) * fontbytes2 );
}

static u_int BIG5(u_char ch1, u_char ch2)
{

	ch1 &= 0x7F;
	
    if (ch2 < 0xA1)
        return(((ch1 - 0x21) * 157 + ch2 - 0x40) * fontbytes2 );
    else
        return(((ch1 - 0x21) * 157 + 63 + ch2 - 0xA1) * fontbytes2 );
}

static u_int JISX0208(u_char ch1, u_char ch2)
{
    ch1 &= 0x7F;
    ch2 &= 0x7F;

#ifdef SAVE_FONT_SPACE
    if (ch1 > 0x2A)  /* 0x2Bxx-0x2Fxx not used */
        return((ch2 - 0x41 + (ch1 - 0x26) * 94 /* 96 */) * fontbytes2 );
    else
        return((ch2 - 0x21 + (ch1 - 0x21) * 94 /* 96 */) * fontbytes2 );
#else
	return ( ( (ch1 - 0x21) * 94 + (ch2 - 0x21) ) * fontbytes2 );
#endif
	
}

static u_int KSC5601(u_char ch1, u_char ch2)
{
    ch1 &= 0x7F;
    ch2 &= 0x7F;

#ifdef SAVE_FONT_SPACE
    if (ch1 > 0x2D)  /* 0x2Exx-2Fxx not used */
        return((ch2 - 0x21 + (ch1 - 0x24) * 94 /* 96 */) * fontbytes2 );
    else
        return((ch2 - 0x21 + (ch1 - 0x21) * 94 /* 96 */) * fontbytes2 );
#else
	return ( ( (ch1 - 0x21) * 94 + (ch2 - 0x21) ) * fontbytes2 );
#endif
}

FontRegs fSRegs[] = {

    {    NULL, 0,      "ISO8859-1", NULL, 0, 0, 'B', 'A', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-2", NULL, 0, 0, 'B', 'B', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-3", NULL, 0, 0, 'B', 'C', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-4", NULL, 0, 0, 'B', 'D', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-5", NULL, 0, 0, 'B', 'L', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-6", NULL, 0, 0, 'B', 'G', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-7", NULL, 0, 0, 'B', 'F', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-8", NULL, 0, 0, 'B', 'H', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,      "ISO8859-9", NULL, 0, 0, 'B', 'M', 0, 0xFF, -1, MAP_FAILED},

    {    NULL, 0,"JISX0201" /*".1976-0" */, NULL, 0, 0, 'J', 'I', 0, 0xFF, -1, MAP_FAILED}, /* no 9 */

    {    NULL, 0,             NULL, NULL, 0, 0,   0,   0, 0,  0x0, -1, MAP_FAILED},
};

FontRegs fDRegs[] = {

    { GB2312  ,  0,  "GB2312" /* "GB2312.1980-0" */, NULL, 0, 0, 'A', 0, 0, 0x777E, -1, MAP_FAILED},  

    { JISX0208 , 0, "JISX0208" /* "JISX0208.1983-0" */, NULL, 0, 0, 'B', 0, 0, 0x7424, -1, MAP_FAILED},

    { KSC5601 ,  0, "KSC" /* "KSC5601.1987-0" */, NULL, 0, 0, 'C', 0, 0, 0x7D7E, -1, MAP_FAILED},

    { JISX0208 , 0, "JISX0212" /* "JISX0212" */, NULL, 0, 0, 'D', 0, 0, 0x7424, -1, MAP_FAILED},

    {    BIG5,   0, "BIG5" /* "BIG5.HKU-0" */, NULL, 0, 0, '0', 0, 0, 0xFAFE, -1, MAP_FAILED},  /* Big5 is Number 4, Important ! */

    {    BIG5,   0, "BIG5.HKU-0", NULL, 0, 0, '1', 0, 0, 0xFAFE, -1, MAP_FAILED},

	{    GBK,	 0, 	"GBK",	  NULL, 0, 0, '?', 0, 0, 0x7EFF, -1, MAP_FAILED}, /* GBK is number 6 */

    {    NULL,   0,     NULL,     NULL, 0, 0,   0, 0, 0,    0x0, -1, MAP_FAILED},
};

const int Coding2FontRegDB[CODE_NUM] =
{
	1, 1, 1, /* ISO-JP, EUC-JP, SJIS: JISX0208 fonts  */
	4, /* Big5 */
	0, /* GB */
	6, /* GBK */
	2, /* KSC */
	-1, /* UHC, no font yet */
	-1, /* Unicode */
};

const int Coding2FontRegSB[CODE_NUM] = 
{
	9, 9, 9,  /* JIS  or should we just use 0? */
	0, 0, 0,
	0,  /* KSC */
    0,  /* UHC  */
    0,  /* Unicode */
};

#if !defined(__FONT_UTILITIES__)

int ConfigFont(const char *str)
{
        char *p, *s;

        p = strtok((char*)str, "\n");
        while(p)
        {
                p = skip_space(p); /* skip the space */
				if (*p && *p != '#')
				{
					s = to_space(p); 
		            *s = '\0'; /* terminate the pathname */
								
#ifdef SUPPORT_X11FONT
					if (strstr(p, ".bdf") || strstr(p, ".pcf") || strstr(p, ".BDF") || strstr(p, ".PCF"))
						LoadX11Font(p);
                	else 
#endif
						LoadBinFont(p); 
				}
                p = strtok(NULL, "\n");
        }
        return SUCCESS;
}

void FontInit(void)
{
#ifdef SUPPORT_FREETYPE_FONT
	if (UseTTFont)
	{
		if (FreetypeInit(TTFontPathName, TTFontSize) == SUCCESS)
		{
			int i;

			fontbytes = FONTBYTES(fontwidth, fontheight);  /* 8x16 -> 16, 12x24, 48 bytes */
    		fontbytes2 = FONTBYTES(2*fontwidth, fontheight);
	
			for(i = 0; fSRegs[i].registry; i++) fSRegs[i].fd = 0;
			for(i = 0; fDRegs[i].registry; i++) fDRegs[i].fd = 0; 

			return;  /* Do not run ConfigFont */
		}
		UseTTFont = 0;
	}
#endif
     DefineCap("Font", ConfigFont, NULL);
}

void FontDetach(int remove)
{
    int i;

#ifdef SUPPORT_FREETYPE_FONT
	if (UseTTFont) 
	{
		FreetypeCleanup();
		return;  /* no need to cleanup bitmap fonts */
	}
#endif

    for(i = 0; fSRegs[i].registry; i++) 
    {
			if (fSRegs[i].fi != MAP_FAILED) MunmapFont(-1, &fSRegs[i]);
        
		fSRegs[i].fi = MAP_FAILED;
    }

    for(i = 0; fDRegs[i].registry; i ++) 
    {
            if (fDRegs[i].fi != MAP_FAILED) MunmapFont(-1, &fDRegs[i]);

		fDRegs[i].fi = MAP_FAILED;
    }
}

void FontAttach(void)
{
    int i;

	lInfo.sb = Coding2FontRegSB[(int)lInfo.sysCoding]; 
    sbFReg = &fSRegs[lInfo.sb];

	lInfo.db = Coding2FontRegDB[lInfo.sysCoding];
    dbFReg = &fDRegs[lInfo.db];

#ifdef SUPPORT_FREETYPE_FONT
	if (UseTTFont)
	{
       	sbFReg->width = fontwidth;
		dbFReg->width = 2*fontwidth;
		sbFReg->height = dbFReg->height = fontheight;
	}
#endif

	if (sbFReg->fd < 0 || MmapFont(-1, sbFReg) )
	{
    	for(i = 0; fSRegs[i].registry; i++) 
			if (fSRegs[i].fd >= 0 && MmapFont(-1, &fSRegs[i]) == 0 )  
			{
				lInfo.sb = i;   /* use first one available  */
				sbFReg = &fSRegs[i];
				break; 
			} 
    }

	if (sbFReg->fi == MAP_FAILED || dbFReg->fd < 0 || MmapFont(-1, dbFReg) )
	{
		fatal("Can't find the required font for encoding!\n");
	}

    for(i = 0; fSRegs[i].registry; i++) 
    {
		if (fSRegs[i].fi == MAP_FAILED)  /* not mapped */
		{
            fSRegs[i].height = sbFReg->height;
            fSRegs[i].width = sbFReg->width;
            fSRegs[i].size = sbFReg->size;
	    	fSRegs[i].bitmap = sbFReg->bitmap;
	    	fSRegs[i].stat = FR_PROXY;
		}
    }

#ifdef DEBUG
	fprintf(stderr, "lInfo.db=0x%x fDRegs[lInfo.db].stat=0x%x fi=%p\r\n", lInfo.db, fDRegs[lInfo.db].stat, fDRegs[lInfo.db].fi);
#endif

#ifdef DEBUG
	fprintf(stderr, "fontwidth=%d fontheight=%d fontbytes=%d fontwidth2=%d fontbytes2=%d\r\n", 
		fontwidth, fontheight, fontbytes, dbFReg->width, fontbytes2);
		
#endif

}

int MmapFont(int encoding, FontRegs *fr)
{

	if (encoding >= 0 && fr == NULL && encoding < CODE_NUM) /* valid encoding */
		fr = &fDRegs[Coding2FontRegDB[encoding]]; 

	if (fr == NULL || fr->fd < 0) return -1;

#ifdef SUPPORT_FREETYPE_FONT
	if (UseTTFont) 
	{
		fr->stat = FR_FREETYPEFONT;
		fr->fi = (FontInfo *)0x0; /* make it non -1 */
		return 0;  
	}
#endif

	if (fr->bitmap && fr->fi != MAP_FAILED) return 0;  /* already mapped */

#ifdef SUPPORT_X11FONT
	if (fr->stat == FR_X11FONT)
	{
		fr->fi = (FontInfo *)0x0;  /* make it non -1 */
#ifdef DEBUG
		fprintf(stderr, "Attach %dx%d X11 font for encoding %d\r\n", fr->width, fr->height, encoding);
#endif
	}
	else
#endif /* SUPPORT_X11FONT */
	{
		fr->fi = (FontInfo *)mmap(0, sizeof(FontInfo) + fr->size, PROT_READ, MAP_SHARED, fr->fd, 0);
		if (fr->fi == MAP_FAILED)
		{
			warn("Mmap size %d font file failed.\r\n", sizeof(FontInfo) + fr->size);
			close(fr->fd); 
			fr->fd = -1;  /* don't want to use it again */
			return -1;
		}
 
		fr->bitmap = ((char*)fr->fi) + sizeof(FontInfo);
		fr->stat = FR_ATTACH;	
	
#ifdef DEBUG	
		fprintf(stderr, "Mmapped %dx%d font at address %p: %d Bytes\r\n",
            fr->width, fr->height, fr->fi, fr->size );
#endif
	}

	return 0;
}

int MunmapFont(int encoding, FontRegs *fr)
{
	if (encoding >= 0 && fr == NULL && encoding < CODE_NUM) /* valid encoding */
		fr = &fDRegs[Coding2FontRegDB[encoding]]; 

	if (!fr) return -1;
	if (fr->fi == MAP_FAILED) return 0; /* already unmapped */

#ifdef SUPPORT_FREETYPEFONT
	if (fr->stat == FR_FREETYPEFONT)
	{
#ifdef DEBUG
		fprintf(stderr,  "Detaching Freetype Font %s.\r\n", TTFontPathName);
#endif
	}
	else
#endif /* SUPPORT_FREETYPEFONT */
#ifdef SUPPORT_X11FONT
	if (fr->stat == FR_X11FONT)
	{
#ifdef DEBUG
		fprintf(stderr, "Detach %dx%d X11 font for encoding %d\r\n", 
			fr->width, fr->height, encoding);
#endif
	}
	else
#endif /* SUPPORT_X11FONT */
	{
		if (munmap(fr->fi, sizeof(FontInfo) + fr->size)) return -1;  /* failed to unmapped? */
 
#ifdef DEBUG
		fprintf(stderr, "Munmapped %dx%d font at address %p: %d Bytes\r\n",
            fr->width, fr->height, fr->fi, fr->size );
#endif
	}

	fr->bitmap = NULL;
	fr->width = fr->height = fr->size = fr->stat = 0;
	fr->fi = MAP_FAILED;

	return 0;
}

int LoadBinFont(char *pathName)
{
	int fd, n;
	char fname[CCE_PATHNAME_MAX+1];
	FontInfo fi;

#ifdef DEBUG
	fprintf(stderr, "Now loading font %s\r\n", pathName);
#endif

	if ((fd = open(pathName, O_RDONLY | CCE_OPENFLAG)) < 0 )
	{
        strcpy(fname, CCELIB "/");
        if (strlen(fname) + strlen(pathName) >= CCE_PATHNAME_MAX) return -1; /* buffer overrun */
        strcat(fname, pathName);
        fd = open( fname, O_RDONLY | CCE_OPENFLAG);
	}
 
	if (fd < 0 || read(fd, &fi, sizeof(fi)) != sizeof(fi) || 
		(fi.size = ConvertLE32ToCPU((unsigned char *)&fi.size)) <= 0 ||
		fi.width < 6 || fi.height < 6 || 
		lseek(fd, sizeof(FontInfo) + fi.size, SEEK_SET) == -1 )  /* make sure it's big enough */
	{
    	if (fd >= 0) warn("Load Font File %s Error.\r\n", pathName); 
		if (fd >= 0) close(fd);
		return -1;
	}

#ifdef DEBUG
	fprintf(stderr, "fi.width=%d fi.height=%d fi.size=%d fi.type=0x%x fi.type & ~CHR_DFLD=%d\n", 
			fi.width, fi.height, fi.size, fi.type, fi.type & ~CHR_DFLD);
#endif

	if (fi.type & CHR_DBC)  /* double-byte fonts */
	{
		n = fi.type & ~CHR_DFLD; 
		if ((fi.type & CHR_DFLD) &&  (u_int)(n) < sizeof(fDRegs)/sizeof(FontRegs))
		{
			if (fontwidth == 0) /* will use first font's dimension */
			{
				fontwidth = fi.width / 2; 
				fontheight = fi.height;
				fontbytes = FONTBYTES(fontwidth, fontheight);  /* 8x16 -> 16, 12x24, 48 bytes */
    			fontbytes2 = FONTBYTES(2*fontwidth, fontheight);
			}
			else if (fi.width != 2*fontwidth || fi.height != fontheight)
			{
				warn("Double-byte font should have same height and twice width as single-byte font.\r\n");
				close(fd);
				return -1;
			}
			
			fDRegs[n].height = fi.height;
			fDRegs[n].width = fi.width;
			fDRegs[n].size = fi.size;
			fDRegs[n].bitmap = NULL; /* not mapped yet! */
			fDRegs[n].fi = MAP_FAILED; /* not mapped yet */
			fDRegs[n].fd = fd;	
		}
	}
	else  /* single byte font */
	{
		n = fi.type & ~CHR_SFLD;
		if ((fi.type & CHR_SFLD)  &&  (u_int)(n) < sizeof(fSRegs)/sizeof(FontRegs)) 
		{
			if (fontwidth == 0)
			{
				fontwidth = fi.width;  /* will override the old one? Normally just load one font */
    			fontheight = fi.height;
    			fontbytes = FONTBYTES(fontwidth, fontheight);  /* 8x16 -> 16, 12x24, 48 bytes */
    			fontbytes2 = FONTBYTES(2*fontwidth, fontheight);
			}
			else if (fi.width != fontwidth || fi.height != fontheight)			
			{
				warn("Double-byte font should have same height and twice width as single-byte font.");
				close(fd);
				return -1;
			}
	
			fSRegs[n].height = fi.height;
			fSRegs[n].width = fi.width;
			fSRegs[n].size = fi.size;
			fSRegs[n].bitmap = NULL; /* not mapped yet! */
			fSRegs[n].fi = MAP_FAILED; /* not mapped yet  -1 */
			fSRegs[n].fd = fd;
		}
	}
	
   return 0;
}

#endif  /* __FONT_UTILITIES__  */

int CodingByRegistry(char *reg)
{
    int i;

    i = 0;
    while (fSRegs[i].registry) 
    {
        if (strlen(reg) >= strlen(fSRegs[i].registry) &&
			!strncasecmp(fSRegs[i].registry, reg, strlen(fSRegs[i].registry)))
            return(i|CHR_SFLD);
        i ++;
    }

    i = 0;
    while (fDRegs[i].registry) 
    {
        if (strlen(reg) >= strlen(fDRegs[i].registry) &&
			!strncasecmp(fDRegs[i].registry, reg, strlen(fDRegs[i].registry)))
            return(i|CHR_DFLD);
        i ++;
    }

	if (!strncasecmp(reg, "ISO8859", 7) /*|| !strncasecmp(reg, "ISO10646", 8) */)
		return (0 | CHR_SFLD);  /* single byte index 0 */
	
    return(-1);
}