CDImageDevice: Implement disc reading for Linux

And fix it for Windows. SubQ reading should now work.

.github/workflows/rolling-release.yml

@@ -232,7 +232,7 @@ jobs:
           extra-cmake-modules libcurl4-openssl-dev libssl-dev libasound2-dev libpulse-dev libx11-xcb-dev build-essential git libclang-dev \
           libclang-11-dev libclang-12-dev patchelf libglib2.0-dev libfontconfig1-dev libharfbuzz-dev libjpeg-dev libpng-dev libfreetype-dev \
           libinput-dev libxcb-*-dev libxkbcommon-dev libxkbcommon-x11-dev libxrender-dev libwayland-dev libgl1-mesa-dev libegl-dev \
-          libwebp-dev libzstd-dev libegl1-mesa-dev libgl1-mesa-dev libssl-dev libx11-dev libx11-xcb-dev libfuse2 \
+          libwebp-dev libzstd-dev libegl1-mesa-dev libgl1-mesa-dev libssl-dev libx11-dev libx11-xcb-dev libfuse2 libudev-dev \
           llvm-16 lld-16 clang-16
 
     - name: Cache Dependencies

CMakeModules/DuckStationDependencies.cmake

@@ -7,6 +7,9 @@ if(NOT WIN32 AND NOT ANDROID)
 	find_package(WebP REQUIRED)
   find_package(ZLIB REQUIRED)
 endif()
+if(LINUX AND NOT ANDROID)
+  find_package(UDEV REQUIRED)
+endif()
 if(UNIX AND NOT APPLE)
   find_package(Libbacktrace)
   if(NOT LIBBACKTRACE_FOUND)

CMakeModules/FindUDEV.cmake

@@ -0,0 +1,32 @@
+# - Try to find UDEV
+# Once done, this will define
+#
+#  UDEV_FOUND - system has UDEV
+#  UDEV_INCLUDE_DIRS - the UDEV include directories
+#  UDEV_LIBRARIES - the UDEV library
+find_package(PkgConfig)
+
+pkg_check_modules(UDEV_PKGCONF libudev)
+
+find_path(UDEV_INCLUDE_DIRS
+  NAMES libudev.h
+  PATHS ${UDEV_PKGCONF_INCLUDE_DIRS}
+)
+
+find_library(UDEV_LIBRARIES
+  NAMES udev
+  PATHS ${UDEV_PKGCONF_LIBRARY_DIRS}
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(UDEV DEFAULT_MSG UDEV_INCLUDE_DIRS UDEV_LIBRARIES)
+
+mark_as_advanced(UDEV_INCLUDE_DIRS UDEV_LIBRARIES)
+
+if(UDEV_FOUND AND NOT (TARGET UDEV::UDEV))
+  add_library (UDEV::UDEV UNKNOWN IMPORTED)
+  set_target_properties(UDEV::UDEV
+    PROPERTIES
+    IMPORTED_LOCATION ${UDEV_LIBRARIES}
+    INTERFACE_INCLUDE_DIRECTORIES ${UDEV_INCLUDE_DIRS})
+endif()

src/util/CMakeLists.txt

@@ -276,6 +276,10 @@ elseif(NOT ANDROID)
   pkg_check_modules(DBUS REQUIRED dbus-1)
   target_include_directories(util PRIVATE ${DBUS_INCLUDE_DIRS})
   target_link_libraries(util PRIVATE ${DBUS_LINK_LIBRARIES})
+
+  if(LINUX)
+    target_link_libraries(util PRIVATE UDEV::UDEV)
+  endif()
 endif()
 
 if(NOT WIN32 AND NOT ANDROID)

src/util/cd_image.cpp

@@ -61,14 +61,21 @@ std::unique_ptr<CDImage> CDImage::Open(const char* filename, bool allow_patches,
   extension = std::strrchr(filename, '.');
 #endif
 
+  std::unique_ptr<CDImage> image;
   if (!extension)
   {
-    Log_ErrorPrintf("Invalid filename: '%s'", filename);
-    return nullptr;
+    // Device filenames on Linux don't have extensions.
+    if (IsDeviceName(filename))
+    {
+      image = OpenDeviceImage(filename, error);
+    }
+    else
+    {
+      Log_ErrorPrintf("Invalid filename: '%s'", filename);
+      return nullptr;
+    }
   }
-
-  std::unique_ptr<CDImage> image;
-  if (StringUtil::Strcasecmp(extension, ".cue") == 0)
+  else if (StringUtil::Strcasecmp(extension, ".cue") == 0)
   {
     image = OpenCueSheetImage(filename, error);
   }