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package common

type Hash [32]byte

var (
    zeroHash    Hash
    zeroAddress Address
)

func BytesToHash(b []byte) Hash {
    var h Hash
    h.SetBytes(b)
    return h
}
func StringToHash(s string) Hash { return BytesToHash([]byte(s)) }

func BytesToAddress(b []byte) Address {
    var a Address
    a.SetBytes(b)
    return a
}
func StringToAddress(s string) Address { return BytesToAddress([]byte(s)) }

// Don't use the default 'String' method in case we want to overwrite

// Get the string representation of the underlying hash
func (h Hash) Str() string {
    return string(h[:])
}

// Sets the hash to the value of b. If b is larger than len(h) it will panic
func (h *Hash) SetBytes(b []byte) {
    if len(b) > len(h) {
        panic("unable to set bytes. too big")
    }

    // reverse loop
    for i := len(b) - 1; i >= 0; i-- {
        h[i] = b[i]
    }
}

// Set string `s` to h. If s is larger than len(h) it will panic
func (h *Hash) SetString(s string) { h.SetBytes([]byte(s)) }

// Sets h to other
func (h *Hash) Set(other Hash) {
    for i, v := range other {
        h[i] = v
    }
}

type Address [20]byte

// Get the string representation of the underlying address
func (a Address) Str() string {
    return string(a[:])
}

// Sets the address to the value of b. If b is larger than len(a) it will panic
func (a *Address) SetBytes(b []byte) {
    if len(b) > len(a) {
        panic("unable to set bytes. too big")
    }

    // reverse loop
    for i := len(b); i >= 0; i-- {
        a[i] = b[i]
    }
}

// Set string `s` to a. If s is larger than len(a) it will panic
func (a *Address) SetString(s string) { a.SetBytes([]byte(s)) }

// Sets a to other
func (a *Address) Set(other Address) {
    for i, v := range other {
        a[i] = v
    }
}