move CRC check

src/fsfw/tmtcpacket/pus/tm/PusTmReader.cpp

@@ -57,6 +57,13 @@ ReturnValue_t PusTmReader::parseData(bool crcCheck) {
   if (result != returnvalue::OK) {
     return result;
   }
+  if (crcCheck) {
+    uint16_t crc16 = CRC::crc16ccitt(spReader.getFullData(), getFullPacketLen());
+    if (crc16 != 0) {
+      // Checksum failure
+      return PusIF::INVALID_CRC_16;
+    }
+  }
   size_t currentOffset = SpacePacketReader::getHeaderLen();
   pointers.secHeaderStart = pointers.spHeaderStart + currentOffset;
   currentOffset += PusTmIF::MIN_SEC_HEADER_LEN;
@@ -77,13 +84,6 @@ ReturnValue_t PusTmReader::parseData(bool crcCheck) {
   }
   currentOffset += sourceDataLen;
   pointers.crcStart = pointers.spHeaderStart + currentOffset;
-  if (crcCheck) {
-    uint16_t crc16 = CRC::crc16ccitt(spReader.getFullData(), getFullPacketLen());
-    if (crc16 != 0) {
-      // Checksum failure
-      return PusIF::INVALID_CRC_16;
-    }
-  }
   return returnvalue::OK;
 }
 bool PusTmReader::isNull() const { return spReader.isNull() or pointers.secHeaderStart == nullptr; }