Compatibility with cstruct v4

dissect/thumbcache/c_thumbcache.py

@@ -1,6 +1,6 @@
 from dissect.cstruct import cstruct
 
-c_thumbcache_index_def = """
+thumbcache_index_def = """
 struct INDEX_HEADER_V1 {
     char    Signature[4];   // 0x00
     uint32  Version;        // 0x04
@@ -75,5 +75,4 @@
     uint32  Unknown;        // 0x28
 }; // 0x2C
 """
-c_thumbcache_index = cstruct()
-c_thumbcache_index.load(c_thumbcache_index_def)
+c_thumbcache_index = cstruct().load(thumbcache_index_def)

dissect/thumbcache/index.py

@@ -3,7 +3,6 @@
 from datetime import datetime
 from typing import BinaryIO, Iterator
 
-from dissect.cstruct import Structure
 from dissect.util import ts
 
 from dissect.thumbcache.c_thumbcache import c_thumbcache_index
@@ -30,12 +29,12 @@ def __init__(self, fh: BinaryIO) -> None:
         self._header = None
 
     @property
-    def header(self) -> Structure:
+    def header(self) -> c_thumbcache_index.INDEX_HEADER_V1 | c_thumbcache_index.INDEX_HEADER_V2:
         if self._header is None:
             self._header = self._find_header(self.fh)
         return self._header
 
-    def _find_header(self, fh: BinaryIO) -> Structure:
+    def _find_header(self, fh: BinaryIO) -> c_thumbcache_index.INDEX_HEADER_V1 | c_thumbcache_index.INDEX_HEADER_V2:
         """Searches for the header signature, and puts ``fh`` at the correct position.
 
         From Windows 8.1 onward, the two fields seem to use a 64-bit format field
@@ -118,12 +117,16 @@ def __init__(self, fh: BinaryIO, type: ThumbnailType) -> None:
         self._data = None
 
     @property
-    def header(self) -> Structure:
+    def header(
+        self,
+    ) -> c_thumbcache_index.VISTA_ENTRY | c_thumbcache_index.WINDOWS7_ENTRY | c_thumbcache_index.WINDOWS8_ENTRY:
         if not self._header:
             self._header = self._select_header()
         return self._header
 
-    def _select_header(self) -> Structure:
+    def _select_header(
+        self,
+    ) -> c_thumbcache_index.VISTA_ENTRY | c_thumbcache_index.WINDOWS7_ENTRY | c_thumbcache_index.WINDOWS8_ENTRY:
         """Selects header version according to the thumbnailtype."""
         if self.type == ThumbnailType.WINDOWS_VISTA:
             return c_thumbcache_index.VISTA_ENTRY(self.fh)

dissect/thumbcache/thumbcache_file.py

@@ -2,8 +2,6 @@
 
 from typing import Any, BinaryIO
 
-from dissect.cstruct import Structure
-
 from dissect.thumbcache.c_thumbcache import c_thumbcache_index
 from dissect.thumbcache.exceptions import (
     InvalidSignatureError,
@@ -41,7 +39,7 @@ def __init__(self, fh: BinaryIO) -> None:
         self._header = self._get_header_type(self.fh)
         self._cached_entries: dict[int, ThumbcacheEntry] = {}
 
-    def _get_header_type(self, fh: BinaryIO) -> Structure:
+    def _get_header_type(self, fh: BinaryIO) -> c_thumbcache_index.CACHE_HEADER_VISTA | c_thumbcache_index.CACHE_HEADER:
         tmp_header = c_thumbcache_index.CACHE_HEADER(fh)
 
         if self._signature != tmp_header.Signature:
@@ -55,7 +53,7 @@ def _get_header_type(self, fh: BinaryIO) -> Structure:
             return tmp_header
 
     @property
-    def header(self) -> Structure:
+    def header(self) -> c_thumbcache_index.CACHE_HEADER_VISTA | c_thumbcache_index.CACHE_HEADER:
         return self._header
 
     @property
@@ -134,7 +132,9 @@ def __init__(self, fh: BinaryIO, type: ThumbnailType) -> None:
 
         self._data = fh.read(self._header.Size - header_size)
 
-    def _get_header(self, thumbnail_type: ThumbnailType) -> type[Structure]:
+    def _get_header(
+        self, thumbnail_type: ThumbnailType
+    ) -> type[c_thumbcache_index.CACHE_ENTRY_VISTA | c_thumbcache_index.CACHE_ENTRY]:
         if thumbnail_type == ThumbnailType.WINDOWS_VISTA:
             return c_thumbcache_index.CACHE_ENTRY_VISTA
         else:

pyproject.toml

@@ -25,8 +25,8 @@ classifiers = [
   "Topic :: Utilities",
 ]
 dependencies = [
-    "dissect.cstruct>=3.0.dev,<4.0.dev",
-    "dissect.util>=3.0.dev,<4.0.dev",
+    "dissect.cstruct>=4.0.dev,<5",
+    "dissect.util>=3,<4",
 ]
 dynamic = ["version"]
 
@@ -35,6 +35,12 @@ homepage = "https://dissect.tools"
 documentation = "https://docs.dissect.tools/en/latest/projects/dissect.thumbcache"
 repository = "https://github.com/fox-it/dissect.thumbcache"
 
+[project.optional-dependencies]
+dev = [
+    "dissect.cstruct>=4.0.dev,<5.0.dev",
+    "dissect.util>=3.0.dev,<4.0.dev",
+]
+
 [project.scripts]
 thumbcache-extract = "dissect.thumbcache.tools.extract_images:main"
 thumbcache-extract-indexed = "dissect.thumbcache.tools.extract_with_index:main"

tox.ini

@@ -11,6 +11,7 @@ minversion = 4.4.3
 requires = virtualenv>=20.16.6
 
 [testenv]
+extras = dev
 deps =
     pytest
     pytest-cov