Initial constants and config for the max initcode size

In order to implement the verification of initcode size, necessary for the RSKIP438,
we need the constant value with the max allowed value. So we can start to validate
and use it on the logic of the verification

rskj-core/src/main/java/org/ethereum/config/Constants.java

@@ -48,6 +48,9 @@ public class Constants {
 
     private static final long DEFAULT_MAX_TIMESTAMPS_DIFF_IN_SECS = 5L * 60;  // 5 mins
     private static final long TESTNET_MAX_TIMESTAMPS_DIFF_IN_SECS = 120L * 60; // 120 mins
+    private static final int MAX_CONTRACT_SIZE = 0x6000;
+    private static final int MAX_INITCODE_SIZE = 2 * MAX_CONTRACT_SIZE;
+
 
     private final byte chainId;
     private final boolean seedCowAccounts;
@@ -214,7 +217,11 @@ public static BigInteger getTransactionGasCap() {
     }
 
     public static int getMaxContractSize() {
-        return 0x6000;
+        return MAX_CONTRACT_SIZE;
+    }
+
+    public static int getMaxInitCodeSize() {
+        return MAX_INITCODE_SIZE;
     }
 
     public static int getMaxAddressByteLength() {

rskj-core/src/main/java/org/ethereum/config/blockchain/upgrades/ConsensusRule.java

@@ -94,7 +94,8 @@ public enum ConsensusRule {
     RSKIP415("rskip415"),
     RSKIP417("rskip417"),
     RSKIP428("rskip428"),
-    RSKIP434("rskip434")
+    RSKIP434("rskip434"),
+    RSKIP438("rskip438")
     ;
 
     private String configKey;

rskj-core/src/main/resources/expected.conf

@@ -96,7 +96,8 @@ blockchain = {
              rskip417 = <hardforkName>
              rskip428 = <hardforkName>
              rskip434 = <hardforkName>
-         }
+             rskip438 = <hardforkName>
+        }
     }
     gc = {
         enabled = <enabled>

rskj-core/src/main/resources/reference.conf

@@ -81,6 +81,7 @@ blockchain = {
             rskip417 = arrowhead600
             rskip428 = lovell700
             rskip434 = arrowhead631
+            rskip438 = lovell700
         }
     }
     gc = {

rskj-core/src/test/java/org/ethereum/config/ConstantsTest.java

@@ -81,4 +81,14 @@ void rskip297ActivationTest() {
         assertEquals(300, Constants.testnet(activationConfig).getMaxTimestampsDiffInSecs(preRskip297Config));
         assertEquals(7200, Constants.testnet(activationConfig).getMaxTimestampsDiffInSecs(postRskip297Config));
     }
+
+    @Test
+    void maxInitcodeSizeTest() {
+        //given
+        int maxInitCodeSizeExpected = 49152;
+        //when
+        int maxInitCodeSize = Constants.getMaxInitCodeSize();
+        //then
+        assertEquals(maxInitCodeSizeExpected, maxInitCodeSize);
+    }
 }

rskj-core/src/test/java/org/ethereum/config/blockchain/upgrades/ActivationConfigTest.java

@@ -123,6 +123,7 @@ class ActivationConfigTest {
             "    rskip417: arrowhead600",
             "    rskip434: arrowhead631",
             "    rskip428: lovell700",
+            "    rskip438: lovell700",
             "}"
     ));