[gnome-games] pc-engine: Support CD-ROM² games

[Adrien Plazas <aplazas src gnome org>]

commit c3c621cf855cc73fcc24a236c83c871701f54130
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Jul 29 12:56:08 2016 +0200

    pc-engine: Support CD-ROM² games
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769496

 plugins/pc-engine/data/pc-engine.plugin     |    2 +-
 plugins/pc-engine/src/Makefile.am           |    1 +
 plugins/pc-engine/src/pc-engine-error.vala  |    5 +++
 plugins/pc-engine/src/pc-engine-plugin.vala |   39 +++++++++++++++++++++++++++
 4 files changed, 46 insertions(+), 1 deletions(-)
---
diff --git a/plugins/pc-engine/data/pc-engine.plugin b/plugins/pc-engine/data/pc-engine.plugin
index 3496f58..dc41af0 100644
--- a/plugins/pc-engine/data/pc-engine.plugin
+++ b/plugins/pc-engine/data/pc-engine.plugin
@@ -1,6 +1,6 @@
 [Plugin]
 Module=libgames-pc-engine-plugin
 Name=PC-Engine Plugin
-Description=Provides support for PC-Engine/TurboGrafx-16 games.
+Description=Provides support for PC-Engine/TurboGrafx-16 and CD-ROM² games.
 Authors=Adrien Plazas <kekun plazas laposte net>
 Copyright=Copyright © 2016 Adrien Plazas
diff --git a/plugins/pc-engine/src/Makefile.am b/plugins/pc-engine/src/Makefile.am
index 9c2dca2..60f0e93 100644
--- a/plugins/pc-engine/src/Makefile.am
+++ b/plugins/pc-engine/src/Makefile.am
@@ -6,6 +6,7 @@ libgames_pc_engine_plugin_la_DEPENDENCIES = \
        $(NULL)
 
 libgames_pc_engine_plugin_la_SOURCES = \
+       pc-engine-error.vala \
        pc-engine-plugin.vala \
        $(NULL)
 
diff --git a/plugins/pc-engine/src/pc-engine-error.vala b/plugins/pc-engine/src/pc-engine-error.vala
new file mode 100644
index 0000000..737da83
--- /dev/null
+++ b/plugins/pc-engine/src/pc-engine-error.vala
@@ -0,0 +1,5 @@
+// This file is part of GNOME Games. License: GPLv3
+
+private errordomain Games.PcEngineError {
+       INVALID_DISC,
+}
diff --git a/plugins/pc-engine/src/pc-engine-plugin.vala b/plugins/pc-engine/src/pc-engine-plugin.vala
index ae70362..d5838b3 100644
--- a/plugins/pc-engine/src/pc-engine-plugin.vala
+++ b/plugins/pc-engine/src/pc-engine-plugin.vala
@@ -2,16 +2,24 @@
 
 private class Games.PcEnginePlugin : Object, Plugin {
        private const string FINGERPRINT_PREFIX = "pc-engine";
+
        private const string MIME_TYPE = "application/x-pc-engine-rom";
+
+       private const string CUE_MIME_TYPE = "application/x-cue";
+       private const string CD_MAGIC_VALUE = "PC Engine CD-ROM SYSTEM";
+
        private const string MODULE_BASENAME = "libretro-pc-engine.so";
        private const bool SUPPORTS_SNAPSHOTTING = true;
 
        public GameSource get_game_source () throws Error {
                var game_uri_adapter = new GenericSyncGameUriAdapter (game_for_uri);
+               var cd_game_uri_adapter = new GenericSyncGameUriAdapter (cd_game_for_uri);
                var query = new MimeTypeTrackerQuery (MIME_TYPE, game_uri_adapter);
+               var cd_query = new MimeTypeTrackerQuery (CUE_MIME_TYPE, cd_game_uri_adapter);
                var connection = Tracker.Sparql.Connection.@get ();
                var source = new TrackerGameSource (connection);
                source.add_query (query);
+               source.add_query (cd_query);
 
                return source;
        }
@@ -28,6 +36,37 @@ private class Games.PcEnginePlugin : Object, Plugin {
 
                return new GenericGame (title, icon, cover, runner);
        }
+
+       private static Game cd_game_for_uri (string uri) throws Error {
+               if (!is_valid_disc (uri))
+                       throw new PcEngineError.INVALID_DISC ("'%s' isn't a valid PC-Engine CD-ROM² disc.", 
uri);
+
+               var uid = new FingerprintUid (uri, FINGERPRINT_PREFIX);
+               var title = new FilenameTitle (uri);
+               var icon = new DummyIcon ();
+               var media = new GriloMedia (title, MIME_TYPE);
+               var cover = new GriloCover (media, uid);
+               var runner = new RetroRunner.with_mime_types (uri, uid, { CUE_MIME_TYPE, MIME_TYPE }, 
MODULE_BASENAME, SUPPORTS_SNAPSHOTTING);
+
+               return new GenericGame (title, icon, cover, runner);
+       }
+
+       private static bool is_valid_disc (string uri) throws Error {
+               var cue_file = File.new_for_uri (uri);
+               var cue_sheet = new CueSheet (cue_file);
+               if (cue_sheet.tracks_number < 2)
+                       return false;
+
+               var track = cue_sheet.get_track (1);
+               if (!track.track_mode.is_mode1 ())
+                       return false;
+
+               var bin_file = track.file.file;
+               var path = bin_file.get_path ();
+               var offsets = Grep.get_offsets (path, CD_MAGIC_VALUE);
+
+               return offsets.length > 0;
+       }
 }
 
 [ModuleInit]