add int casting to input offset

Author: h-mayorquin

neo/rawio/blackrockrawio.py

@@ -988,24 +988,24 @@ def __read_nsx_dataheader_variant_b(
 
         data_header = {}
 
-        offset_to_first_data_block = offset or int(self.__nsx_basic_header[nsx_nb]["bytes_in_headers"])
+        offset_to_first_data_block = int(offset or self.__nsx_basic_header[nsx_nb]["bytes_in_headers"])
 
         channel_count = int(self.__nsx_basic_header[nsx_nb]["channel_count"])
-        offset = offset_to_first_data_block
+        current_offset = offset_to_first_data_block
         data_block_index = 0
-        while offset < filesize:
-            packet_header = self.__read_nsx_dataheader(nsx_nb, offset)
+        while current_offset < filesize:
+            packet_header = self.__read_nsx_dataheader(nsx_nb, current_offset)
             header_flag = packet_header["header_flag"]
             # NSX data blocks must have header_flag = 1, other values indicate file corruption
             if header_flag != 1:
                 raise ValueError(
-                    f"Invalid NSX data block header at offset {offset:#x} in ns{nsx_nb} file. "
+                    f"Invalid NSX data block header at offset {current_offset:#x} in ns{nsx_nb} file. "
                     f"Expected header_flag=1, got {header_flag}. "
                     f"This may indicate file corruption or unsupported NSX format variant. "
                     f"Block index: {data_block_index}, File size: {filesize} bytes"
                 )
             timestamp = packet_header["timestamp"]
-            offset_to_data_block_start = offset + packet_header.dtype.itemsize
+            offset_to_data_block_start = current_offset + packet_header.dtype.itemsize
             num_data_points = int(packet_header["nb_data_points"])
 
             data_header[data_block_index] = {
@@ -1017,7 +1017,7 @@ def __read_nsx_dataheader_variant_b(
 
             # Jump to the next data block
             data_block_size = num_data_points * channel_count * np.dtype("int16").itemsize
-            offset = offset_to_data_block_start + data_block_size
+            current_offset = offset_to_data_block_start + data_block_size
 
             data_block_index += 1