Function parse_hex_line

LoadFile/teensy_loader_cli.c:689–749

int
parse_hex_line(char *line)
{
	int addr, code, num;
	int sum, len, cksum, i;
	char *ptr;

	num = 0;
	if (line[0] != ':') return 0;
	if (strlen(line) < 11) return 0;
	ptr = line+1;
	if (!sscanf(ptr, "%02x", &len)) return 0;
	ptr += 2;
	if ((int)strlen(line) < (11 + (len * 2)) ) return 0;
	if (!sscanf(ptr, "%04x", &addr)) return 0;
	ptr += 4;
	  /* printf("Line: length=%d Addr=%d\n", len, addr); */
	if (!sscanf(ptr, "%02x", &code)) return 0;
	if (addr + extended_addr + len >= MAX_MEMORY_SIZE) return 0;
	ptr += 2;
	sum = (len & 255) + ((addr >> 8) & 255) + (addr & 255) + (code & 255);
	if (code != 0) {
		if (code == 1) {
			end_record_seen = 1;
			return 1;
		}
		if (code == 2 && len == 2) {
			if (!sscanf(ptr, "%04x", &i)) return 1;
			ptr += 4;
			sum += ((i >> 8) & 255) + (i & 255);
			if (!sscanf(ptr, "%02x", &cksum)) return 1;
			if (((sum & 255) + (cksum & 255)) & 255) return 1;
			extended_addr = i << 4;
			//printf("ext addr = %05X\n", extended_addr);
		}
		if (code == 4 && len == 2) {
			if (!sscanf(ptr, "%04x", &i)) return 1;
			ptr += 4;
			sum += ((i >> 8) & 255) + (i & 255);
			if (!sscanf(ptr, "%02x", &cksum)) return 1;
			if (((sum & 255) + (cksum & 255)) & 255) return 1;
			extended_addr = i << 16;
			//printf("ext addr = %08X\n", extended_addr);
		}
		return 1;       // non-data line
	}
	byte_count += len;
	while (num != len) {
		if (sscanf(ptr, "%02x", &i) != 1) return 0;
		i &= 255;
		firmware_image[addr + extended_addr + num] = i;
		firmware_mask[addr + extended_addr + num] = 1;
		ptr += 2;
		sum += i;
		(num)++;
		if (num >= 256) return 0;
	}
	if (!sscanf(ptr, "%02x", &cksum)) return 0;