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forgejo/vendor/github.com/boombuler/barcode/utils/runeint.go

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package utils
// RuneToInt converts a rune between '0' and '9' to an integer between 0 and 9
// If the rune is outside of this range -1 is returned.
func RuneToInt(r rune) int {
if r >= '0' && r <= '9' {
return int(r - '0')
}
return -1
}
// IntToRune converts a digit 0 - 9 to the rune '0' - '9'. If the given int is outside
// of this range 'F' is returned!
func IntToRune(i int) rune {
if i >= 0 && i <= 9 {
return rune(i + '0')
}
return 'F'
}