Use Ubuntu 20.04 on GitHub Actions for Python 3.6 support (hopefully)

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ jobs:
   test:
     strategy:
       matrix:
-        platform: [macos-latest, ubuntu-latest, windows-latest]
+        platform: [macos-latest, ubuntu-20.04, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3
@@ -12,6 +12,6 @@ jobs:
           python-version: "3.6"
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - run: python -m pip install --upgrade tox
       - run: tox

README.md

@@ -128,6 +128,8 @@ see the ["resource forks" section of the mac_file_format_docs repo](https://gith
 
 * Added `open` and `open_raw` methods to `Resource` objects,
   for stream-based access to resource data.
+* Fixed reading of compressed resource headers with the header length field incorrectly set to 0
+  (because real Mac OS apparently accepts this).
 
 ### Version 1.8.0
 

setup.cfg

@@ -18,6 +18,7 @@ classifiers =
 	Programming Language :: Python :: 3.8
 	Programming Language :: Python :: 3.9
 	Programming Language :: Python :: 3.10
+	Programming Language :: Python :: 3.11
 	Topic :: Software Development :: Disassemblers
 	Topic :: System
 	Topic :: Utilities
@@ -66,15 +67,24 @@ extend-exclude =
 # The following issues are ignored because they do not match our code style:
 ignore =
 	# These E1 checks report many false positives for code that is (consistently) indented with tabs alone.
-	E101, # indentation contains mixed spaces and tabs
-	E117, # over-indented
-	E126, # continuation line over-indented for hanging indent
-	E226, # missing whitespace around arithmetic operator
-	E261, # at least two spaces before inline comment
-	E501, # line too long
-	W191, # indentation contains tabs
-	W293, # blank line contains whitespace
-	W503, # line break before binary operator
+	# indentation contains mixed spaces and tabs
+	E101,
+	# over-indented
+	E117,
+	# continuation line over-indented for hanging indent
+	E126,
+	# missing whitespace around arithmetic operator
+	E226,
+	# at least two spaces before inline comment
+	E261,
+	# line too long
+	E501,
+	# indentation contains tabs
+	W191,
+	# blank line contains whitespace
+	W293,
+	# line break before binary operator
+	W503,
 
 [mypy]
 files=src/**/*.py

src/rsrcfork/api.py

@@ -152,12 +152,12 @@ class Resource(object):
 	
 	@property
 	def resource_type(self) -> bytes:
-		warnings.warn(DeprecationWarning("The resource_type attribute has been deprecated and will be removed in a future version. Please use the type attribute instead."))
+		warnings.warn(DeprecationWarning("The resource_type attribute has been deprecated and will be removed in a future version. Please use the type attribute instead."), stacklevel=2)
 		return self.type
 	
 	@property
 	def resource_id(self) -> int:
-		warnings.warn(DeprecationWarning("The resource_id attribute has been deprecated and will be removed in a future version. Please use the id attribute instead."))
+		warnings.warn(DeprecationWarning("The resource_id attribute has been deprecated and will be removed in a future version. Please use the id attribute instead."), stacklevel=2)
 		return self.id
 	
 	@property
@@ -369,7 +369,7 @@ class ResourceFile(typing.Mapping[bytes, typing.Mapping[int, Resource]], typing.
 				fork = "rsrc"
 			else:
 				fork = "data"
-			warnings.warn(DeprecationWarning(f"The rsrcfork parameter has been deprecated and will be removed in a future version. Please use fork={fork!r} instead of rsrcfork={kwargs['rsrcfork']!r}."))
+			warnings.warn(DeprecationWarning(f"The rsrcfork parameter has been deprecated and will be removed in a future version. Please use fork={fork!r} instead of rsrcfork={kwargs['rsrcfork']!r}."), stacklevel=2)
 			del kwargs["rsrcfork"]
 		
 		if fork == "auto":

src/rsrcfork/compress/common.py

@@ -46,8 +46,8 @@ class CompressedHeaderInfo(object):
 			raise DecompressError("Invalid header")
 		if signature != COMPRESSED_SIGNATURE:
 			raise DecompressError(f"Invalid signature: {signature!r}, expected {COMPRESSED_SIGNATURE!r}")
-		if header_length != 0x12:
-			raise DecompressError(f"Unsupported header length: 0x{header_length:>04x}, expected 0x12")
+		if header_length not in {0, 0x12}:
+			raise DecompressError(f"Unsupported header length value: 0x{header_length:>04x}, expected 0x12 or 0")
 		
 		if compression_type == COMPRESSED_TYPE_8:
 			working_buffer_fractional_size, expansion_buffer_size, dcmp_id, reserved = STRUCT_COMPRESSED_TYPE_8_HEADER.unpack(remainder)

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 # When updating the Python versions here,
 # please also update the corresponding Python versions in the GitHub Actions workflow (.github/workflows/ci.yml).
-envlist = py{36,310},flake8,mypy,package
+envlist = py{36,311},flake8,mypy,package
 
 [testenv]
 commands = python -m unittest discover --start-directory ./tests