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78 lines
1.7 KiB
78 lines
1.7 KiB
package merkle
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import (
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. "github.com/tendermint/tendermint/binary"
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"os"
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"fmt"
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"crypto/sha256"
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)
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/*
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Compute a deterministic merkle hash from a list of byteslices.
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*/
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func HashFromBinarySlice(items []Binary) ByteSlice {
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switch len(items) {
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case 0:
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panic("Cannot compute hash of empty slice")
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case 1:
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hasher := sha256.New()
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_, err := items[0].WriteTo(hasher)
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if err != nil { panic(err) }
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return ByteSlice(hasher.Sum(nil))
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default:
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hasher := sha256.New()
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_, err := HashFromBinarySlice(items[0:len(items)/2]).WriteTo(hasher)
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if err != nil { panic(err) }
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_, err = HashFromBinarySlice(items[len(items)/2:]).WriteTo(hasher)
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if err != nil { panic(err) }
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return ByteSlice(hasher.Sum(nil))
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}
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}
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func PrintIAVLNode(node *IAVLNode) {
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fmt.Println("==== NODE")
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if node != nil {
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printIAVLNode(node, 0)
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}
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fmt.Println("==== END")
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}
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func printIAVLNode(node *IAVLNode, indent int) {
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indentPrefix := ""
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for i:=0; i<indent; i++ {
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indentPrefix += " "
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}
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if node.right != nil {
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printIAVLNode(node.rightFilled(nil), indent+1)
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}
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fmt.Printf("%s%v:%v\n", indentPrefix, node.key, node.height)
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if node.left != nil {
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printIAVLNode(node.leftFilled(nil), indent+1)
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}
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}
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func randstr(length int) String {
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if urandom, err := os.Open("/dev/urandom"); err != nil {
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panic(err)
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} else {
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slice := make([]byte, length)
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if _, err := urandom.Read(slice); err != nil {
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panic(err)
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}
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urandom.Close()
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return String(slice)
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}
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panic("unreachable")
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}
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func maxUint8(a, b uint8) uint8 {
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if a > b {
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return a
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}
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return b
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}
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