Some new dependencies for py7r

bypy/sources.json

@@ -806,6 +806,48 @@
         }
     },
 
+    {
+        "name": "multivolumefile",
+		"comment": "Needed by py7zr",
+        "unix": {
+            "filename": "multivolumefile-0.2.3.tar.gz",
+            "hash": "sha256:a0648d0aafbc96e59198d5c17e9acad7eb531abea51035d08ce8060dcad709d6",
+            "urls": ["pypi"]
+        }
+    },
+
+    {
+        "name": "python-brotli",
+		"comment": "Needed by py7zr",
+        "unix": {
+            "filename": "brotli-1.0.9.zip",
+            "hash": "sha256:4d1b810aa0ed773f81dceda2cc7b403d01057458730e309856356d4ef4188438",
+            "urls": ["pypi"]
+        }
+    },
+
+    {
+        "name": "pyzstd",
+		"comment": "Needed by py7zr",
+        "unix": {
+            "filename": "pyzstd-0.15.0.tar.gz",
+            "hash": "sha256:bf15a39cb3c9b662775e22ffa8c4da09fdde6a15ece5e0ed710b6d3b4329cf36",
+            "urls": ["pypi"]
+        }
+    },
+
+
+    {
+        "name": "pyppmd",
+		"comment": "Needed by py7zr",
+        "unix": {
+            "filename": "pyppmd-0.17.3.tar.gz",
+            "hash": "sha256:05a4765833623d5cc1c9afc27d9b05fb64f0319711beffe0b44d9695eb1beb0a",
+            "urls": ["pypi"]
+        }
+    },
+
+
     {
         "name": "py7zr",
         "unix": {

src/calibre/constants.py

@@ -206,6 +206,10 @@ class DeVendor:
         if fullname.startswith('PyQt5.'):
             # this is present for third party plugin compat
             return ModuleSpec(fullname, DeVendorLoader('qt.webengine' if 'QWebEngine' in fullname else 'qt.core'))
+        if fullname.startswith('Cryptodome'):
+            # this is needed for py7zr which uses pycryptodomex instead of
+            # pycryptodome for some reason
+            return ModuleSpec(fullname, DeVendorLoader(fullname.replace('dome', '', 1)))
 
 
 class ExtensionsPackageLoader: