Function TidToNum

bridge/tidconversions.go:36–56

tidToNum converts a Bluesky TID into a 64-bit number.

(tid string)

// tidToNum converts a Bluesky TID into a 64-bit number.
func TidToNum(tid string) (uint64, error) {
	if len(tid) != 13 {
		return 0, fmt.Errorf("TID must be 13 characters")
	}

	var num uint64
	for _, c := range tid {
		index := strings.IndexRune(tidChars, c)
		if index == -1 {
			return 0, fmt.Errorf("invalid character in TID: %c", c)
		}
		num = (num << 5) | uint64(index)
	}

	// Verify the first bit is 0
	if (num & 0x8000000000000000) != 0 {
		return 0, fmt.Errorf("first bit must be 0")
	}

	return num, nil
}