Method readdir

SerialFlashDirectory.cpp:333–379

}

bool SerialFlashChip::readdir(char *filename, uint32_t strsize, uint32_t &filesize)
{
	uint32_t maxfiles, index, straddr;
	uint32_t i, n;
	uint32_t buf[2];
	uint16_t hash;
	char str[16], *p=filename;

	filename[0] = 0;
	maxfiles = check_signature();
	if (!maxfiles) return false;
	maxfiles &= 0xFFFF; 
	index = dirindex;
	while (1) {
		if (index >= maxfiles) return false;
		 //Serial.printf("readdir, index = %u\n", index);
		SerialFlash.read(8 + index * 2, &hash, 2);
		if (hash != 0) break;
		index++;  // skip deleted entries
	}
	dirindex = index + 1;
	buf[1] = 0;
	SerialFlash.read(8 + 4 + maxfiles * 2 + index * 10, buf, 6);
	if (buf[0] == 0xFFFFFFFF) return false;
	filesize = buf[0];
	straddr = 8 + maxfiles * 12 + buf[1] * 4;
	 //Serial.printf("  length = %u\n", buf[0]);
	 //Serial.printf("  straddr = %u\n", straddr);

	while (strsize) {
		n = strsize;
		if (n > sizeof(str)) n = sizeof(str);
		SerialFlash.read(straddr, str, n);
		for (i=0; i < n; i++) {
			*p++ = str[i];
			if (str[i] == 0) {
				 //Serial.printf("  name = %s\n", filename);
				return true;
			}
		}
		strsize -= n;
		straddr += n;
	}
	*(p - 1) = 0;
	 //Serial.printf("  name(overflow) = %s\n", filename);
	return true;
}


void SerialFlashFile::erase()