/*
 * Simple filter to convert a binary file (stdin) to motorola
 * s-records on stdout.  Generates s-records from address zero,
 * so supply an offset to the load command on the target board.
 */

#include <stdio.h>

main()
{
	unsigned char ibuf[32], *ip;
	char obuf[100], *op;
	int addr = 0;
	unsigned char sum;
	int cnt;

	while (cnt = fread (ibuf, 1, 32, stdin))
	{
		sum = cnt+4;
		sum += (unsigned char)addr;
		sum += (unsigned char)(addr >> 8);
		sum += (unsigned char)(addr >> 16);
		op = obuf;
		ip = ibuf;
		op += sprintf (op, "S2%02X%06X", cnt+4, addr);
		addr += cnt;
		while (cnt--)
		{
			sum += *ip;
			op += sprintf (op, "%02X", *ip++);
		}
		sprintf (op, "%02X", (unsigned char)~sum);
		puts (obuf);
	}
}