53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
package change
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import (
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"encoding/binary"
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"encoding/hex"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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)
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// ClaimID represents a Claim's ClaimID.
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const ClaimIDSize = 20
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type ClaimID [ClaimIDSize]byte
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// NewClaimID returns a Claim ID calculated from Ripemd160(Sha256(OUTPOINT).
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func NewClaimID(op wire.OutPoint) (id ClaimID) {
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var buffer [chainhash.HashSize + 4]byte // hoping for stack alloc
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copy(buffer[:], op.Hash[:])
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binary.BigEndian.PutUint32(buffer[chainhash.HashSize:], op.Index)
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copy(id[:], btcutil.Hash160(buffer[:]))
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return id
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}
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// NewIDFromString returns a Claim ID from a string.
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func NewIDFromString(s string) (id ClaimID, err error) {
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if len(s) == 40 {
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_, err = hex.Decode(id[:], []byte(s))
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} else {
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copy(id[:], s)
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}
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for i, j := 0, len(id)-1; i < j; i, j = i+1, j-1 {
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id[i], id[j] = id[j], id[i]
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}
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return id, err
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}
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// Key is for in-memory maps
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func (id ClaimID) Key() string {
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return string(id[:])
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}
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// String is for anything written to a DB
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func (id ClaimID) String() string {
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for i, j := 0, len(id)-1; i < j; i, j = i+1, j-1 {
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id[i], id[j] = id[j], id[i]
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}
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return hex.EncodeToString(id[:])
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}
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