VFS: Add VDirOpenArchive

src/gba/context/context.c

@@ -73,7 +73,25 @@ void GBAContextDeinit(struct GBAContext* context) {
 }
 
 bool GBAContextLoadROM(struct GBAContext* context, const char* path, bool autoloadSave) {
-	context->rom = VFileOpen(path, O_RDONLY);
+	struct VDir* dir = VDirOpenArchive(path);
+	if (dir) {
+		struct VDirEntry* de;
+		while ((de = dir->listNext(dir))) {
+			struct VFile* vf = dir->openFile(dir, de->name(de), O_RDONLY);
+			if (!vf) {
+				continue;
+			}
+			if (GBAIsROM(vf)) {
+				context->rom = vf;
+				break;
+			}
+			vf->close(vf);
+		}
+		dir->close(dir);
+	} else {
+		context->rom = VFileOpen(path, O_RDONLY);
+	}
+
 	if (!context->rom) {
 		return false;
 	}

src/gba/supervisor/thread.c

@@ -683,16 +683,9 @@ void GBAThreadPauseFromThread(struct GBAThread* threadContext) {
 void GBAThreadLoadROM(struct GBAThread* threadContext, const char* fname) {
 	threadContext->rom = VFileOpen(fname, O_RDONLY);
 	threadContext->gameDir = 0;
-#if USE_LIBZIP
 	if (!threadContext->gameDir) {
-		threadContext->gameDir = VDirOpenZip(fname, 0);
+		threadContext->gameDir = VDirOpenArchive(fname);
 	}
-#endif
-#if USE_LZMA
-	if (!threadContext->gameDir) {
-		threadContext->gameDir = VDirOpen7z(fname, 0);
-	}
-#endif
 }
 
 static void _loadGameDir(struct GBAThread* threadContext) {

src/util/vfs.c

@@ -96,6 +96,21 @@ struct VFile* VFileOpen(const char* path, int flags) {
 #endif
 }
 
+struct VDir* VDirOpenArchive(const char* path) {
+	struct VDir* dir = 0;
+#if USE_LIBZIP
+	if (!dir) {
+		dir = VDirOpenZip(path, 0);
+	}
+#endif
+#if USE_LZMA
+	if (!dir) {
+		dir = VDirOpen7z(path, 0);
+	}
+#endif
+	return dir;
+}
+
 ssize_t VFileReadline(struct VFile* vf, char* buffer, size_t size) {
 	size_t bytesRead = 0;
 	while (bytesRead < size - 1) {

src/util/vfs.h

@@ -69,6 +69,7 @@ struct VFile* VFileFromMemory(void* mem, size_t size);
 struct VFile* VFileFromFILE(FILE* file);
 
 struct VDir* VDirOpen(const char* path);
+struct VDir* VDirOpenArchive(const char* path);
 
 #ifdef USE_LIBZIP
 struct VDir* VDirOpenZip(const char* path, int flags);