witness as display string

src/main/java/com/sparrowwallet/drongo/protocol/Script.java

@@ -246,10 +246,14 @@ public class Script {
     }
 
     public String toDisplayString() {
+        return toDisplayString(chunks);
+    }
+
+    static String toDisplayString(List<ScriptChunk> scriptChunks) {
         StringBuilder builder = new StringBuilder();
         int signatureCount = 1;
         int pubKeyCount = 1;
-        for(ScriptChunk chunk : chunks) {
+        for(ScriptChunk chunk : scriptChunks) {
             if(chunk.isSignature()) {
                 builder.append("<signature").append(signatureCount++).append(">");
             } else if(chunk.isScript()) {

src/main/java/com/sparrowwallet/drongo/protocol/ScriptChunk.java

@@ -145,6 +145,16 @@ public class ScriptChunk {
         return opcodeLength + pushDataSizeLength + dataLength;
     }
 
+    static int getOpcodeForLength(int length) {
+        if(length <= 0xFF) {
+            return OP_PUSHDATA1;
+        }
+        if(length <= 0xFFFF) {
+            return OP_PUSHDATA2;
+        }
+        return OP_PUSHDATA4;
+    }
+
     public String toString() {
         if (data == null) {
             return "OP_" + getOpCodeName(opcode);

src/main/java/com/sparrowwallet/drongo/protocol/TransactionWitness.java

@@ -56,19 +56,28 @@ public class TransactionWitness {
 
     @Override
     public String toString() {
-        StringBuffer buffer = new StringBuffer();
+        StringBuilder builder = new StringBuilder();
         for (byte[] push : pushes) {
             if (push == null) {
-                buffer.append("NULL");
+                builder.append("NULL");
             } else if (push.length == 0) {
-                buffer.append("EMPTY");
+                builder.append("EMPTY");
             } else {
-                buffer.append(Hex.toHexString(push));
+                builder.append(Hex.toHexString(push));
             }
-            buffer.append(" ");
+            builder.append(" ");
         }
 
-        return buffer.toString().trim();
+        return builder.toString().trim();
+    }
+
+    public String toDisplayString() {
+        List<ScriptChunk> scriptChunks = new ArrayList<>(pushes.size());
+        for(byte[] push : pushes) {
+           scriptChunks.add(new ScriptChunk(ScriptChunk.getOpcodeForLength(push.length), push));
+        }
+
+        return Script.toDisplayString(scriptChunks);
     }
 
     @Override