Fill buffer to 4 bytes if needed inside convertBinaryToInteger function

Author: kakato10

index.js

@@ -57,7 +57,11 @@ Header.prototype.parseFieldSubRecord = function(buffer) {
 };
 
 Header.prototype.convertBinaryToInteger = function(buffer) {
-    return buffer.readInt32LE(0, true);
+    const fillerBytesCount = 4 - buffer.length;
+    const fillerBytes = Buffer.alloc(fillerBytesCount, 0);
+    const filledBuffer = Buffer.concat([buffer, fillerBytesCount]);
+    
+    return filledBuffer.readInt32LE(0);
 };