package tape

// MaxStructureLength determines how long a TAPE data structure can be. This
// applies to:
//
//  - OTA
//  - SBA/LBA
//  - KTV
//
// By default it is set at 2^20 (about a million).
// You shouldn't need to change this. If you do, it should only be set once at
// the start of the program.
var MaxStructureLength = 1024 * 1024

// MaxInt is the maximum value an int can hold. This varies depending on the
// system.
const MaxInt int = int(^uint(0) >> 1)

// Uint64ToIntSafe casts the input to an int if it can be done without overflow,
// or returns an error otherwise.
func Uint64ToIntSafe(input uint64) (int, error) {
	if input > uint64(MaxInt) {
		return 0, ErrTooLarge
	}
	return int(input), nil
}