add block header

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

@@ -1,4 +1,60 @@
 package com.sparrowwallet.drongo.protocol;
 
-public class BlockHeader {
+import java.util.Date;
+
+public class BlockHeader extends Message {
+    private long version;
+    private Sha256Hash prevBlockHash;
+    private Sha256Hash merkleRoot, witnessRoot;
+    private long time;
+    private long difficultyTarget; // "nBits"
+    private long nonce;
+
+    public BlockHeader(byte[] rawheader) {
+        super(rawheader, 0);
+    }
+
+    @Override
+    protected void parse() throws ProtocolException {
+        version = readUint32();
+        prevBlockHash = readHash();
+        merkleRoot = readHash();
+        time = readUint32();
+        difficultyTarget = readUint32();
+        nonce = readUint32();
+
+        length = cursor - offset;
+    }
+
+    public long getVersion() {
+        return version;
+    }
+
+    public Sha256Hash getPrevBlockHash() {
+        return prevBlockHash;
+    }
+
+    public Sha256Hash getMerkleRoot() {
+        return merkleRoot;
+    }
+
+    public Sha256Hash getWitnessRoot() {
+        return witnessRoot;
+    }
+
+    public long getTime() {
+        return time;
+    }
+
+    public Date getTimeAsDate() {
+        return new Date(time);
+    }
+
+    public long getDifficultyTarget() {
+        return difficultyTarget;
+    }
+
+    public long getNonce() {
+        return nonce;
+    }
 }

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

@@ -13,7 +13,7 @@ public abstract class Message {
     public static final int MAX_SIZE = 0x02000000; // 32MB
     public static final int UNKNOWN_LENGTH = Integer.MIN_VALUE;
 
-    protected byte[] rawtx;
+    protected byte[] payload;
 
     // The offset is how many bytes into the provided byte array this message payload starts at.
     protected int offset;
@@ -23,8 +23,8 @@ public abstract class Message {
 
     protected int length = UNKNOWN_LENGTH;
 
-    public Message(byte[] rawtx, int offset) {
+    public Message(byte[] payload, int offset) {
-        this.rawtx = rawtx;
+        this.payload = payload;
         this.cursor = this.offset = offset;
 
         parse();
@@ -53,7 +53,7 @@ public abstract class Message {
 
     protected long readUint32() throws ProtocolException {
         try {
-            long u = Utils.readUint32(rawtx, cursor);
+            long u = Utils.readUint32(payload, cursor);
             cursor += 4;
             return u;
         } catch (ArrayIndexOutOfBoundsException e) {
@@ -63,7 +63,7 @@ public abstract class Message {
 
     protected long readInt64() throws ProtocolException {
         try {
-            long u = Utils.readInt64(rawtx, cursor);
+            long u = Utils.readInt64(payload, cursor);
             cursor += 8;
             return u;
         } catch (ArrayIndexOutOfBoundsException e) {
@@ -72,12 +72,12 @@ public abstract class Message {
     }
 
     protected byte[] readBytes(int length) throws ProtocolException {
-        if ((length > MAX_SIZE) || (cursor + length > rawtx.length)) {
+        if ((length > MAX_SIZE) || (cursor + length > payload.length)) {
             throw new ProtocolException("Claimed value length too large: " + length);
         }
         try {
             byte[] b = new byte[length];
-            System.arraycopy(rawtx, cursor, b, 0, length);
+            System.arraycopy(payload, cursor, b, 0, length);
             cursor += length;
             return b;
         } catch (IndexOutOfBoundsException e) {
@@ -91,7 +91,7 @@ public abstract class Message {
 
     protected long readVarInt(int offset) throws ProtocolException {
         try {
-            VarInt varint = new VarInt(rawtx, cursor + offset);
+            VarInt varint = new VarInt(payload, cursor + offset);
             cursor += offset + varint.getOriginalSizeInBytes();
             return varint.value;
         } catch (ArrayIndexOutOfBoundsException e) {

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

@@ -182,7 +182,7 @@ public class Transaction extends ChildMessage {
         // version
         version = readUint32();
         // peek at marker
-        byte marker = rawtx[cursor];
+        byte marker = payload[cursor];
         segwit = (marker == 0);
         // marker, flag
         if (segwit) {
@@ -206,7 +206,7 @@ public class Transaction extends ChildMessage {
         long numInputs = readVarInt();
         inputs = new ArrayList<>(Math.min((int) numInputs, Utils.MAX_INITIAL_ARRAY_LENGTH));
         for (long i = 0; i < numInputs; i++) {
-            TransactionInput input = new TransactionInput(this, rawtx, cursor);
+            TransactionInput input = new TransactionInput(this, payload, cursor);
             inputs.add(input);
             long scriptLen = readVarInt(TransactionOutPoint.MESSAGE_LENGTH);
             cursor += scriptLen + 4;
@@ -217,7 +217,7 @@ public class Transaction extends ChildMessage {
         long numOutputs = readVarInt();
         outputs = new ArrayList<>(Math.min((int) numOutputs, Utils.MAX_INITIAL_ARRAY_LENGTH));
         for (long i = 0; i < numOutputs; i++) {
-            TransactionOutput output = new TransactionOutput(this, rawtx, cursor);
+            TransactionOutput output = new TransactionOutput(this, payload, cursor);
             outputs.add(output);
             long scriptLen = readVarInt(8);
             cursor += scriptLen;
@@ -227,7 +227,7 @@ public class Transaction extends ChildMessage {
     private void parseWitnesses() {
         int numWitnesses = inputs.size();
         for (int i = 0; i < numWitnesses; i++) {
-            TransactionWitness witness = new TransactionWitness(this, rawtx, cursor);
+            TransactionWitness witness = new TransactionWitness(this, payload, cursor);
             inputs.get(i).setWitness(witness);
             cursor += witness.getLength();
         }

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

@@ -31,7 +31,7 @@ public class TransactionInput extends ChildMessage {
     }
 
     protected void parse() throws ProtocolException {
-        outpoint = new TransactionOutPoint(rawtx, cursor, this);
+        outpoint = new TransactionOutPoint(payload, cursor, this);
         cursor += outpoint.getMessageSize();
         int scriptLen = (int) readVarInt();
         length = cursor - offset + scriptLen + 4;
@@ -62,7 +62,7 @@ public class TransactionInput extends ChildMessage {
     }
 
     void setScriptBytes(byte[] scriptBytes) {
-        super.rawtx = null;
+        super.payload = null;
         this.scriptSig = null;
         int oldLength = length;
         this.scriptBytes = scriptBytes;

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

@@ -34,7 +34,7 @@ public class TransactionOutput extends ChildMessage {
         try {
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             bitcoinSerializeToStream(baos);
-            rawtx = baos.toByteArray();
+            payload = baos.toByteArray();
         } catch(IOException e) {
             //ignore
         }