Merge pull request #377 from ekawas-vrify/patch-1

Fix UnboundLocalError when reading byte_stream

Author: JamesParrott

README.md

@@ -93,10 +93,13 @@ part of your geospatial project.
 
 # Version Changes
 
-## Next
+
+## 3.0.3.dev
+### Bug fix
+- Prevented UnboundLocalError when reading non-single point M and Z type Shapefiles (@ekawas-vrify).
 
 ### Testing.
-- Test PyShp on the Python 3.14 official release (officially released this week, no longer in beta)
+- Test PyShp on the Python 3.14 official release (officially released this week, no longer in beta).
 
 ## 3.0.2
 
@@ -1572,6 +1575,7 @@ Casey Meisenzahl
 Charles Arnold
 David A. Riggs
 davidh-ssec
+Edward Kawas
 Evan Heidtmann
 ezcitron
 fiveham

changelog.txt

@@ -1,4 +1,8 @@
-VERSION NEXT
+VERSION 3.0.3.dev
+
+2025-10-25
+	Bug fix:
+	* Prevented UnboundLocalError when reading non-single point M and Z type Shapefiles (@ekawas-vrify).
 
 2025-10-10
 	Testing:

src/shapefile.py

@@ -8,7 +8,7 @@
 
 from __future__ import annotations
 
-__version__ = "3.0.3.dev0"
+__version__ = "3.0.3.dev"
 
 import array
 import doctest
@@ -1492,7 +1492,8 @@ class _HasM(_CanHaveBBox):
     @staticmethod
     def _read_ms_from_byte_stream(
         b_io: ReadSeekableBinStream, nPoints: int, next_shape: int
-    ) -> tuple[MBox, list[float | None]]:
+    ) -> tuple[MBox | None, list[float | None]]:
+        mbox = None  # Ensure mbox is always defined
         if next_shape - b_io.tell() >= 16:
             mbox = unpack("<2d", b_io.read(16))
         # Measure values less than -10e38 are nodata values according to the spec