Merge remote-tracking branch 'ethereum/conversion' into conversion

2 files changed, 57 insertions, 0 deletions

diff --git a/common/common.go b/common/common.go
index 1371d18d4..155bb5c2a 100644
--- a/common/common.go
+++ b/common/common.go
@@ -65,6 +65,15 @@ func DefaultDataDir() string {
 	}
 }
 
+func ToHex(b []byte) string {
+	hex := Bytes2Hex(b)
+	// Prefer output of "0x0" instead of "0x"
+	if len(hex) == 0 {
+		hex = "0"
+	}
+	return "0x" + hex
+}
+
 func FromHex(s string) []byte {
 	if len(s) > 1 {
 		if s[0:2] == "0x" {
diff --git a/common/types_template.go b/common/types_template.go
new file mode 100644
index 000000000..1c82a36dc
--- /dev/null
+++ b/common/types_template.go
@@ -0,0 +1,48 @@
+// +build none
+//sed -e 's/_N_/Hash/g' -e 's/_S_/32/g' -e '1d' types_template.go | gofmt -w hash.go
+
+package common
+
+import "math/big"
+
+type _N_ [_S_]byte
+
+func BytesTo_N_(b []byte) _N_ {
+	var h _N_
+	h.SetBytes(b)
+	return h
+}
+func StringTo_N_(s string) _N_ { return BytesTo_N_([]byte(s)) }
+func BigTo_N_(b *big.Int) _N_  { return BytesTo_N_(b.Bytes()) }
+func HexTo_N_(s string) _N_    { return BytesTo_N_(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 _N_) Str() string   { return string(h[:]) }
+func (h _N_) Bytes() []byte { return h[:] }
+func (h _N_) Big() *big.Int { return Bytes2Big(h[:]) }
+func (h _N_) 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 *_N_) SetBytes(b []byte) {
+	// Use the right most bytes
+	if len(b) > len(h) {
+		b = b[len(b)-_S_:]
+	}
+
+	// Reverse the loop
+	for i := len(b) - 1; i >= 0; i-- {
+		h[_S_-len(b)+i] = b[i]
+	}
+}
+
+// Set string `s` to h. If s is larger than len(h) it will panic
+func (h *_N_) SetString(s string) { h.SetBytes([]byte(s)) }
+
+// Sets h to other
+func (h *_N_) Set(other _N_) {
+	for i, v := range other {
+		h[i] = v
+	}
+}