Merge branch 'release/poc5-rc1'

1 files changed, 59 insertions, 0 deletions

diff --git a/ethchain/asm.go b/ethchain/asm.go
new file mode 100644
index 000000000..3194549ba
--- /dev/null
+++ b/ethchain/asm.go
@@ -0,0 +1,59 @@
+package ethchain
+
+import (
+	"fmt"
+	"github.com/ethereum/eth-go/ethutil"
+	"math/big"
+)
+
+func Disassemble(script []byte) (asm []string) {
+	pc := new(big.Int)
+	for {
+		if pc.Cmp(big.NewInt(int64(len(script)))) >= 0 {
+			return
+		}
+
+		// Get the memory location of pc
+		val := script[pc.Int64()]
+		// Get the opcode (it must be an opcode!)
+		op := OpCode(val)
+
+		asm = append(asm, fmt.Sprintf("%v", op))
+
+		switch op {
+		case oPUSH: // Push PC+1 on to the stack
+			pc.Add(pc, ethutil.Big1)
+			data := script[pc.Int64() : pc.Int64()+32]
+			val := ethutil.BigD(data)
+
+			var b []byte
+			if val.Int64() == 0 {
+				b = []byte{0}
+			} else {
+				b = val.Bytes()
+			}
+
+			asm = append(asm, fmt.Sprintf("0x%x", b))
+
+			pc.Add(pc, big.NewInt(31))
+		case oPUSH20:
+			pc.Add(pc, ethutil.Big1)
+			data := script[pc.Int64() : pc.Int64()+20]
+			val := ethutil.BigD(data)
+			var b []byte
+			if val.Int64() == 0 {
+				b = []byte{0}
+			} else {
+				b = val.Bytes()
+			}
+
+			asm = append(asm, fmt.Sprintf("0x%x", b))
+
+			pc.Add(pc, big.NewInt(19))
+		}
+
+		pc.Add(pc, ethutil.Big1)
+	}
+
+	return
+}