data.c

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/*
**
** FUNCTIONAL DESCRIPTION:
** 
**      Given *any* input file, output it as an ARM .s file that can
**      can be assembled and linked anyplace.
**
** CALLING ENVIRONMENT: 
**
**	user mode
** 
** AUTHOR: David A Rusling, [e-mail]
**
*/

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>

/*
 *  Macros
 */
#define TRUE 1
#define FALSE 0
#define _error(string1)\
     {	\
	fprintf(stderr, "ERROR: %s\n", string1);	\
	exit(1);    \
     }

#define _SEEN(o) seen[o-'a']
#define _OPTION(o) (_SEEN(o) == TRUE)


/*
 *  Global data
 */
#define SEEN_SIZE 100
char seen[SEEN_SIZE];			/* upper and lower case */

/*
 *  Forward routine descriptions.
 */
#define int64 unsigned long

extern int main(int argc, char **argv);
extern void usage();
extern void output_image(FILE *ifile, FILE *ofile, int size);
extern int64 fsize(FILE *fp);


/*
 *  External routines.
 */

int main(int argc, char **argv)
{
    char *image = NULL;
    char *out = NULL;

    FILE *ifile;
    FILE *ofile;

    int64 entry = 0;
    int64 base = 0;

    int size;

    char *arg, option;
    int i;
    unsigned long int padding, offset, first;
/*
 * Initialise
 */

    for (i = 0; i < SEEN_SIZE; i++)
	seen[i] = FALSE;

/*
 * Parse arguments, but Skip argv[0].
 */
    for (i = 1; i < argc; i++) {
	arg = argv[i];
	if (*arg == '-') {
/*
 * This is a -xyz style options list.  Work out the options specified.
 */
	    arg++;			/* skip the '-' */
	    while (option = *arg++) {	/* until we reach the '0' string
					 * terminator */
		option = tolower(option);
		switch (option) {
		    case 'h': 
			usage();
			exit(1);
		    case 'v': 		/* verbose, allow upper and lower case
					 */
			_SEEN(option) = TRUE;
			break;


		    default: 
			usage();
			exit(0);
			break;
		}
	    }
	} else {
/*
 *  Filename.
 */
	    if (image == NULL)
		image = arg;
	    else {
		if (out == NULL) 
		    out = arg;
		else
		    _error("too many filenames given");
	    }
	}
    }
/*
 *  Announce ourselves.
 */
    fprintf(stderr, "data [V2.0]\n");
/*
 *  Check the arguments passed.
 */
    /* check for an image file */
    if (image == NULL)
	_error("no image file given");

/*
 *  Tell the world what the arguments are.
 */
    if _OPTION('v') {
	fprintf(stderr, "\timage file is %s\n", image);
	fprintf(stderr, "\toutput file is %s\n", out == NULL ? "stdout" : out);
    }

/*
 *  Open the files.
 */
    ifile = fopen(image, "rb");
    if (ifile == NULL) 
	_error("failed to open input file");

    if (out == NULL)
	ofile = stdout;
    else {
	ofile = fopen(out, "wb");
	if (ofile == NULL) {
	    fclose(ifile);
	    _error("failed to open output file");
	}
    }

    size = fsize(ifile) ;
    fprintf(ofile, "\tAREA\timage, CODE, READONLY\n") ;
    fprintf(ofile, "|__main|\n") ;
    fprintf(ofile, "\tENTRY\n") ;
    output_image(ifile, ofile, size) ;
    fprintf(ofile, "\tEND\n");

/*
 *  Close up shop and exit.
 */
    fclose(ifile);
    if (out != NULL) fclose(ofile);

    return EXIT_SUCCESS;

}					/* end of main() */

/****************************************************************
 * Output the image to the output file                          *
 ****************************************************************/
void output_image(FILE *ifile, FILE *ofile, int size) 
{
    int n, byte;
    unsigned char ch;
    unsigned int i;

    /*
     * This assumes little-endian byte-order.
     */
    n = 0; i = 0;
    while (size--) {
	byte = n % 4;
	ch = getc(ifile);
	i |= (unsigned long long) ch << (8 * byte);
	if (byte == 3) {
	  fprintf(ofile, "\tDCD\t0x%04x\n", i);
	  i = 0;
	}
	++n;
    }
}

/****************************************************************
 * How do you use this thing?                                   *
 ****************************************************************/
void usage()
{
    fprintf(stderr, "data\n\n");
    fprintf(stderr, "> data [-v] input-file output-file\n");
    fprintf(stderr, "\nwhere:\n");
    fprintf(stderr, "\nFlags: -hv\n");
    fprintf(stderr, "\t-h: print this help text\n");
    fprintf(stderr, "\t-v: verbose\n");
    fprintf(stderr, "Example\n\n");
    fprintf(stderr, "\tdata -v bootp bootp.s\n\n");
}

int64 fsize(FILE *fp)
{
    int c;
    int64 size;

    size = 0;
    fseek(fp, 0, 0);
    while ((c = getc(fp)) != EOF)
	 size++;
    fseek(fp, 0, 0);
    return size;
}