Allow user-provided boot ROMs in iOS

Cocoa/Document.m

@@ -255,21 +255,6 @@ static void debuggerReloadCallback(GB_gameboy_t *gb)
     return self;
 }
 
-- (NSString *)bootROMPathForName:(NSString *)name
-{
-    NSURL *url = [[NSUserDefaults standardUserDefaults] URLForKey:@"GBBootROMsFolder"];
-    if (url) {
-        NSString *path = [url path];
-        path = [path stringByAppendingPathComponent:name];
-        path = [path stringByAppendingPathExtension:@"bin"];
-        if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
-            return path;
-        }
-    }
-    
-    return [[NSBundle mainBundle] pathForResource:name ofType:@"bin"];
-}
-
 - (GB_model_t)internalModel
 {
     switch (_currentModel) {
@@ -647,6 +632,21 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
     GB_debugger_set_disabled(&_gb, false);
 }
 
+- (NSString *)bootROMPathForName:(NSString *)name
+{
+    NSURL *url = [[NSUserDefaults standardUserDefaults] URLForKey:@"GBBootROMsFolder"];
+    if (url) {
+        NSString *path = [url path];
+        path = [path stringByAppendingPathComponent:name];
+        path = [path stringByAppendingPathExtension:@"bin"];
+        if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
+            return path;
+        }
+    }
+    
+    return [[NSBundle mainBundle] pathForResource:name ofType:@"bin"];
+}
+
 - (void)loadBootROM: (GB_boot_rom_t)type
 {
     static NSString *const names[] = {

iOS/GBROMManager.m

@@ -59,6 +59,7 @@
 - (NSString *)romFileForROM:(NSString *)rom
 {
     if ([rom isEqualToString:@"Inbox"]) return nil;
+    if ([rom isEqualToString:@"Boot ROMs"]) return nil;
     if (rom == _currentROM) {
         return self.romFile;
     }

iOS/GBSettingsViewController.m

@@ -163,6 +163,31 @@ static NSString const *typeLightTemp = @"typeLightTemp";
                 return @"";
             }
         },
+        @{
+            @"header": @"Boot ROMs",
+            @"items": @[
+                @{@"type": typeRadio, @"pref": @"GBCustomBootROMs", @"title": @"Use Built-in Boot ROMs", @"value": @NO,},
+                @{@"type": typeRadio, @"pref": @"GBCustomBootROMs", @"title": @"Use Boot ROMs from Files", @"value": @YES,},
+                @{@"type": typeBlock, @"title": @"Open Boot ROMs Folder", @"block": ^bool(GBSettingsViewController *controller) {
+                    
+                    NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)[0];
+                    path = [path stringByAppendingPathComponent:@"Boot ROMs"];
+                    [[NSFileManager defaultManager] createDirectoryAtPath:path
+                                              withIntermediateDirectories:true
+                                                               attributes:nil
+                                                                    error:nil];
+                    
+                    
+                    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"shareddocuments://%@", [path stringByReplacingOccurrencesOfString:@" "
+                                                                                                                                                                        withString:@"%20"]]]
+                                                       options:nil
+                                             completionHandler:nil];
+
+                    return false;
+                }},
+            ],
+            @"footer": @"Put your boot ROM files (dmg_boot.bin, cgb_boot.bin, etc.) in the Boot ROMs folder to use them"
+        },
         @{
             @"header": @"Emulated Revisions",
             @"items": @[

iOS/GBViewController.m

@@ -965,6 +965,23 @@ didReceiveNotificationResponse:(UNNotificationResponse *)response
         [_audioLock unlock];
     }
 }
+
+
+- (NSString *)bootROMPathForName:(NSString *)name
+{
+    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"GBCustomBootROMs"]) {
+        NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)[0];
+        path = [path stringByAppendingPathComponent:@"Boot ROMs"];
+        path = [path stringByAppendingPathComponent:name];
+        path = [path stringByAppendingPathExtension:@"bin"];
+        if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
+            return path;
+        }
+    }
+    
+    return [[NSBundle mainBundle] pathForResource:name ofType:@"bin"];
+}
+
 - (void)loadBootROM: (GB_boot_rom_t)type
 {
     static NSString *const names[] = {
@@ -975,9 +992,24 @@ didReceiveNotificationResponse:(UNNotificationResponse *)response
         [GB_BOOT_ROM_SGB2] = @"sgb2_boot",
         [GB_BOOT_ROM_CGB_0] = @"cgb0_boot",
         [GB_BOOT_ROM_CGB] = @"cgb_boot",
+        [GB_BOOT_ROM_CGB_E] = @"cgbE_boot",
+        [GB_BOOT_ROM_AGB_0] = @"agb0_boot",
         [GB_BOOT_ROM_AGB] = @"agb_boot",
     };
-    GB_load_boot_rom(&_gb, [[[NSBundle mainBundle] pathForResource:names[type] ofType:@"bin"] UTF8String]);
+    NSString *name = names[type];
+    NSString *path = [self bootROMPathForName:name];
+    /* These boot types are not commonly available, and they are indentical
+     from an emulator perspective, so fall back to the more common variants
+     if they can't be found. */
+    if (!path && type == GB_BOOT_ROM_CGB_E) {
+        [self loadBootROM:GB_BOOT_ROM_CGB];
+        return;
+    }
+    if (!path && type == GB_BOOT_ROM_AGB_0) {
+        [self loadBootROM:GB_BOOT_ROM_AGB];
+        return;
+    }
+    GB_load_boot_rom(&_gb, [path UTF8String]);
 }
 
 - (void)vblankWithType:(GB_vblank_type_t)type