From 38bd1a30f708565c187e254152f7e451dbbea5c5 Mon Sep 17 00:00:00 2001
From: Daniel Pressler <Daniel.Pressler@govsco.com>
Date: Thu, 11 Jun 2026 07:21:55 -0700
Subject: [PATCH] Bugfix: SubFile.seek for unsignedinteger

---
 CHANGELOG.md      |  3 +++
 jbpy/core.py      | 10 +++++-----
 test/test_core.py |  6 ++++++
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ff2ff7..cf4b800 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- `SubFile.seek` for some integer-like scalar types (e.g. `numpy.unsignedinteger`)
+
 
 ## [0.6.0] - 2026-02-03
 
diff --git a/jbpy/core.py b/jbpy/core.py
index 5dc2d9a..cb37f32 100644
--- a/jbpy/core.py
+++ b/jbpy/core.py
@@ -61,8 +61,8 @@ class SubFile:
 
     def __init__(self, file: Any, start: int, length: int):
         self._file = file
-        self._start = start
-        self._length = length
+        self._start = int(start)
+        self._length = int(length)
         self._pos = 0  # position within the subfile
 
     def seek(self, offset: int, whence: int = 0) -> int:
@@ -82,11 +82,11 @@ def seek(self, offset: int, whence: int = 0) -> int:
             Current offset in the SubFile
         """
         if whence == 0:
-            new_pos = offset
+            new_pos = int(offset)
         elif whence == 1:
-            new_pos = self._pos + offset
+            new_pos = self._pos + int(offset)
         elif whence == 2:
-            new_pos = self._length + offset
+            new_pos = self._length + int(offset)
         else:
             raise ValueError(f"whence value {whence} unsupported")
 
diff --git a/test/test_core.py b/test/test_core.py
index e0d8921..8f7b277 100644
--- a/test/test_core.py
+++ b/test/test_core.py
@@ -9,6 +9,7 @@
 import string
 import tempfile
 
+import numpy as np
 import pytest
 
 import jbpy.core
@@ -784,6 +785,11 @@ def test_subfile(tmp_path):
         subfile.seek(length + 100)
         assert subfile.read() == b""
 
+        # seeking works with int-like
+        subfile.seek(np.uint8(24), os.SEEK_SET)
+        subfile.seek(-8, os.SEEK_CUR)
+        assert subfile.tell() == 16
+
         assert subfile.readable()