Merge pull request #150 from fjl/develop

Merge eth-go repo into go-ethereum

1 files changed, 53 insertions, 0 deletions

diff --git a/ethtrie/slice.go b/ethtrie/slice.go
new file mode 100644
index 000000000..f0edc9532
--- /dev/null
+++ b/ethtrie/slice.go
@@ -0,0 +1,53 @@
+package ethtrie
+
+import (
+	"bytes"
+	"math"
+)
+
+// Helper function for comparing slices
+func CompareIntSlice(a, b []int) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i, v := range a {
+		if v != b[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// Returns the amount of nibbles that match each other from 0 ...
+func MatchingNibbleLength(a, b []byte) int {
+	var i, length = 0, int(math.Min(float64(len(a)), float64(len(b))))
+
+	for i < length {
+		if a[i] != b[i] {
+			break
+		}
+		i++
+	}
+
+	return i
+}
+
+func HasTerm(s []byte) bool {
+	return s[len(s)-1] == 16
+}
+
+func RemTerm(s []byte) []byte {
+	if HasTerm(s) {
+		return s[:len(s)-1]
+	}
+
+	return s
+}
+
+func BeginsWith(a, b []byte) bool {
+	if len(b) > len(a) {
+		return false
+	}
+
+	return bytes.Equal(a[:len(b)], b)
+}