common/types.go


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package common

import (
    "math/big"
    "math/rand"
    "reflect"
)

const (
    hashLength    = 32
    addressLength = 20
)

type (
    Hash    [hashLength]byte
    Address [addressLength]byte
)

func BytesToHash(b []byte) Hash {
    var h Hash
    h.SetBytes(b)
    return h
}
func StringToHash(s string) Hash { return BytesToHash([]byte(s)) }
func BigToHash(b *big.Int) Hash  { return BytesToHash(b.Bytes()) }
func HexToHash(s string) Hash    { return BytesToHash(FromHex(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[:]) }
func (h Hash) Bytes() []byte { return h[:] }
func (h Hash) Big() *big.Int { return Bytes2Big(h[:]) }
func (h Hash) Hex() string   { return "0x" + Bytes2Hex(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) {
        b = b[len(b)-hashLength:]
    }

    copy(h[hashLength-len(b):], b)
}

// 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
    }
}

// Generate implements testing/quick.Generator.
func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
    m := rand.Intn(len(h))
    for i := len(h) - 1; i > m; i-- {
        h[i] = byte(rand.Uint32())
    }
    return reflect.ValueOf(h)
}

/////////// Address
func BytesToAddress(b []byte) Address {
    var a Address
    a.SetBytes(b)
    return a
}
func StringToAddress(s string) Address { return BytesToAddress([]byte(s)) }
func BigToAddress(b *big.Int) Address  { return BytesToAddress(b.Bytes()) }
func HexToAddress(s string) Address    { return BytesToAddress(FromHex(s)) }

// Get the string representation of the underlying address
func (a Address) Str() string   { return string(a[:]) }
func (a Address) Bytes() []byte { return a[:] }
func (a Address) Big() *big.Int { return Bytes2Big(a[:]) }
func (a Address) Hash() Hash    { return BytesToHash(a[:]) }
func (a Address) Hex() string   { return "0x" + Bytes2Hex(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) {
        b = b[len(b)-addressLength:]
    }
    copy(a[addressLength-len(b):], b)
}

// 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
    }
}