Add MAX and MIN tx types

src_common/ethUstream.c

@@ -265,9 +265,13 @@ static parserStatus_e processTxInternal(txContext_t *context) {
         }
         // EIP 2718: TransactionType might be present before the TransactionPayload.
         if (*context->workBuffer > 0x00 && *context->workBuffer < 0x7f) {
+            PRINTF("TX TYPE: %u\n", context->txType);
+            if (*context->workBuffer < MIN_TX_TYPE || *context->workBuffer > MAX_TX_TYPE ) {
+                PRINTF("Transaction type not supported\n");
+                return USTREAM_FAULT;
+            }
             context->txType = *context->workBuffer;
             context->workBuffer++;
-            PRINTF("TX TYPE: %u\n", context->txType);
         }
         if (!context->processingField) {
             PRINTF("PROCESSING FIELD\n");

src_common/ethUstream.h

@@ -55,8 +55,10 @@ typedef enum rlpTxField_e {
 
 // EIP 2718 TransactionType
 typedef enum txType_e {
-    LegacyTransaction = 1,
-    BerlinTransaction = 2
+    MIN_TX_TYPE,
+    LEGACY_TX,
+    BERLIN_TX,
+    MAX_TX_TYPE,
 } txType_e;
 
 typedef enum parserStatus_e {