fix: support Java 22 and newer clients for packs that disregard ZIP spec

These changes were tested to work well up to Java 24 and should not
impact older Java versions.

Fixes #294.

CHANGELOG.md

@@ -69,6 +69,9 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 #### Fixed
 
+- Packs generated with the `zip_spec_conformance_level` option set to
+  `disregard` now reliably work on Minecraft clients running Java 22 or newer.
+  (Thanks _@mrkinau_ and _@mihannnik_ for reporting the issue!)
 - Shaders that depend on `#moj_import`ed or parent-defined preprocessor
   variables to be syntactically correct or expand to the intended source code
   will no longer cause PackSquash to fail or change their semantics.

packages/packsquash/src/squash_zip/obfuscation_engine.rs

@@ -206,12 +206,12 @@ impl ObfuscationEngine {
 						4096 + central_directory_header.compressed_size % 4096;
 				}
 				central_directory_header.local_header_disk_number =
-					(random_u32(seed) % 32768) as u16 + 32768;
+					(random_u32(seed) % 32768) as u16 + 32767;
 			} else {
 				if obfuscate_uncompressed_size {
 					central_directory_header.uncompressed_size = 0xFFFFFF7F;
 				}
-				central_directory_header.local_header_disk_number = u16::MAX;
+				central_directory_header.local_header_disk_number = u16::MAX - 1;
 			}
 
 			if let SizeIncreasingObfuscation::Enabled {