[gnome-games] core: Add FirmwareManager

[Alexander Mikhaylenko <alexm src gnome org>]

commit e7bc01c279187292f41c1adc400cb99adce971a8
Author: Adwait Rawat <adwait rawat gmail com>
Date:   Thu Jun 11 02:41:43 2020 +0900

    core: Add FirmwareManager
    
    Added FirmwareManager class to handle firmware related actions in a
    different class as they were being handled by RetroCoreSource previously.

 src/core/firmware-manager.vala | 51 ++++++++++++++++++++++++++++++++++++++++++
 src/meson.build                |  1 +
 2 files changed, 52 insertions(+)
---
diff --git a/src/core/firmware-manager.vala b/src/core/firmware-manager.vala
new file mode 100644
index 00000000..1e43c170
--- /dev/null
+++ b/src/core/firmware-manager.vala
@@ -0,0 +1,51 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+errordomain Games.FirmwareError {
+       FIRMWARE_NOT_FOUND,
+}
+
+public class Games.FirmwareManager : Object {
+       public void is_all_firmware_valid (Core core, Platform platform) throws Error {
+               var platforms_dir = Application.get_platforms_dir ();
+               var platform_id = platform.get_id ();
+               var firmware_dir = File.new_for_path (@"$platforms_dir/$platform_id/system");
+
+               foreach (var firmware in core.get_all_firmware (platform)) {
+                       if (!core.get_is_firmware_mandatory (firmware))
+                               continue;
+
+                       var firmware_path = core.get_firmware_path (firmware);
+                       var firmware_file = firmware_dir.get_child (firmware_path);
+                       if (!firmware_file.query_exists ())
+                               throw new FirmwareError.FIRMWARE_NOT_FOUND ("This game requires the %s 
firmware file to run.", firmware_file.get_path ());
+
+                       check_firmware_is_valid (core, firmware, firmware_file);
+               }
+       }
+
+       private void check_firmware_is_valid (Core core, string firmware, File firmware_file) throws Error {
+               var has_md5 = core.has_firmware_md5 (firmware);
+               var has_sha512 = core.has_firmware_sha512 (firmware);
+               if (!has_md5 || !has_sha512)
+                       return;
+
+               var stream = firmware_file.read ();
+
+               stream.seek (0, SeekType.END);
+               var size = (size_t) stream.tell ();
+               stream.seek (0, SeekType.SET);
+               var bytes = stream.read_bytes (size);
+
+               if (has_md5) {
+                       var md5 = core.get_firmware_md5 (firmware);
+                       if (Checksum.compute_for_bytes (ChecksumType.MD5, bytes) != md5)
+                               throw new FirmwareError.FIRMWARE_NOT_FOUND ("This game requires the %s 
firmware file with a MD5 fingerprint of %s to run.", firmware_file.get_path (), md5);
+               }
+
+               if (has_sha512) {
+                       var sha512 = core.get_firmware_sha512 (firmware);
+                       if (Checksum.compute_for_bytes (ChecksumType.SHA512, bytes) != sha512)
+                               throw new FirmwareError.FIRMWARE_NOT_FOUND ("This game requires the %s 
firmware file with a SHA-512 fingerprint of %s to run.", firmware_file.get_path (), sha512);
+               }
+       }
+}
diff --git a/src/meson.build b/src/meson.build
index 5d56f024..ef621bc6 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -17,6 +17,7 @@ vala_sources = [
   'core/core.vala',
   'core/cover.vala',
   'core/cover-loader.vala',
+  'core/firmware-manager.vala',
   'core/game.vala',
   'core/game-callback.vala',
   'core/game-collection.vala',