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/*

 *

 * Program that converts IBM font files to a format that works on Unix systems.

 * Essentially all the information needed came from the Adobe paper "Supporting

 * Downloadable PostScript Fonts". To use the program type,

 *

 *	ibmfont font.ibm >font.unix

 *

 * where font.ibm is the font file, exactly as it came over from an IBM PC,

 * and font.unix is equivalent host resident font file usable on Unix systems.

 * 

 */

#include <stdio.h>

#include <signal.h>

#define OFF		0

#define ON		1

#define NON_FATAL	0

#define FATAL		1

#define FALSE		0

#define TRUE		1

char	**argv;

int	argc;

char	*prog_name;

int	x_stat;

int	debug = OFF;

int	ignore = OFF;

FILE	*fp_in = stdin;

FILE	*fp_out = stdout;

/*****************************************************************************/

main(agc, agv)

    int		agc;

    char	*agv[];

{

/*

 *

 * IBM PC to Unix font converter.

 *

 */

    argc = agc;

    argv = agv;

    prog_name = argv[0];

    options();

    arguments();

    exit(x_stat);

}   /* End of main */

/*****************************************************************************/

options()

{

    int		ch;

    char	*names = "DI";

    extern char	*optarg;

    extern int	optind;

/*

 *

 * Command line options.

 *

 */

    while ( (ch = getopt(argc, argv, names)) != EOF ) {

	switch ( ch ) {

	    case 'D':			/* debug flag */

		    debug = ON;

		    break;

	    case 'I':			/* ignore FATAL errors */

		    ignore = ON;

		    break;

	    case '?':			/* don't understand the option */

		    error(FATAL, "");

		    break;

	    default:			/* don't know what to do for ch */

		    error(FATAL, "missing case for option %c\n", ch);

		    break;

	}   /* End switch */

    }   /* End while */

    argc -= optind;

    argv += optind;

}   /* End of options */

/*****************************************************************************/

arguments()

{

/*

 *

 * Everything esle is an input file. No arguments or '-' means stdin.

 *

 */

    if ( argc < 1 )

	conv();

    else

	while ( argc > 0 ) {

	    if ( strcmp(*argv, "-") == 0 )

		fp_in = stdin;

	    else if ( (fp_in = fopen(*argv, "r")) == NULL )

		error(FATAL, "can't open %s", *argv);

	    conv();

	    if ( fp_in != stdin )

		fclose(fp_in);

	    argc--;

	    argv++;

	}   /* End while */

}   /* End of arguments */

/*****************************************************************************/

conv()

{

    int		blocksize;

    int		blocktype;

    int		seg;

    long	ftell();

/*

 *

 * Font files on the IBM PC are stored in a compressed binary format. Individual

 * segments in the file are preceeded by a header that looks like,

 *

 *		Byte 1:		128

 *		Byte 2:		segment type (1=ASCII, 2=TOHEX, or 3=EOF)

 *		Bytes 3-6:	length of the segment

 *		Bytes 7 ...	data

 *

 */

    while ( 1 ) {

	seg = ftell(fp_in);

	if ( getc(fp_in) != 128 )

	    error(FATAL, "bad file format");

	blocktype = getc(fp_in);

	blocksize = getint(fp_in);

	if ( debug == ON ) {

	    fprintf(stderr, "blocktype = %d, blocksize = %d\n", blocktype, blocksize);

	    fprintf(stderr, "start=0%o, end=0%o\n", seg, seg+blocksize+6);

	    fprintf(stderr, "start=%d, end=%d\n", seg, seg+blocksize+6);

	}   /* End if */

	switch ( blocktype ) {

	    case 1:

		asciitext(blocksize);

		break;

	    case 2:

		hexdata(blocksize);

		break;

	    case 3:

		return;

	    default:

		error(FATAL, "unknown resource type %d", blocktype);

	}   /* End switch */

    }	/* End while */

}   /* End of conv */

/*****************************************************************************/

asciitext(count)

    int		count;			/* bytes left in the block */

{

    int		ch;

    int		i = 0;

/*

 *

 * Handles type 1 (ie. ASCII text) blocks. Changing carriage returns to newlines

 * is all I've done.

 *

 */

    for ( i = 0; i < count; i++ ) {

	if ( (ch = getc(fp_in)) == '\r' )

	    ch = '\n';

	putc(ch, fp_out);

    }	/* End for */

}   /* End of asciitext */

/*****************************************************************************/

hexdata(count)

    int		count;			/* bytes left in the block */

{

    int		i;

    int		n;

/*

 *

 * Reads the next count bytes and converts each byte to hex. Also starts a new

 * line every 80 hex characters.

 *

 */

    for ( i = 0, n = 0; i < count; i++ ) {

	fprintf(fp_out, "%.2X", getc(fp_in));

	if ( (++n % 40) == 0 )

	    putc('\n', fp_out);

    }	/* End for */

}   /* End of hexdata */

/*****************************************************************************/

getint()

{

    int		val;

/*

 *

 * Reads the next four bytes into an integer and returns the value to the caller.

 * First two bytes are probably always 0.

 *

 */

    val = getc(fp_in);

    val |= (getc(fp_in) << 8);

    val |= (getc(fp_in) << 16);

    val |= (getc(fp_in) << 24);

    return(val);

}   /* End of getint */ 

/*****************************************************************************/

error(kind, mesg, a1, a2, a3)

    int		kind;

    char	*mesg;

    unsigned	a1, a2, a3;

{

/*

 *

 * Print mesg and quit if kind is FATAL.

 *

 */

    if ( mesg != NULL && *mesg != '\0' ) {

	fprintf(stderr, "%s: ", prog_name);

	fprintf(stderr, mesg, a1, a2, a3);

	putc('\n', stderr);

    }	/* End if */

    if ( kind == FATAL && ignore == OFF )

	exit(x_stat | 01);

}   /* End of error */

/*****************************************************************************/