Fix NDS and files backup

cores/GNUmakefile

@@ -24,8 +24,9 @@ fetch-%:
 	@target=`pwd`/lib$*.a && \
 	name=`jq -r '."$*".repository // "$*"' cores.json` && \
 	owner=`jq -r '."$*".owner // "libretro"' cores.json` && \
+	branch=`jq -r '."$*".branch // "master"' cores.json` && \
 	echo Fetching $$name... && \
-	git -C $$name pull $(QUIET) || git clone https://github.com/$$owner/$$name.git $(QUIET)
+	git -C $$name pull $(QUIET) || git clone -b $$branch https://github.com/$$owner/$$name.git $(QUIET)
 
 build-%: fetch-%
 	@target=`pwd`/lib$*.a && \

cores/cores.json

@@ -30,6 +30,8 @@
 	"desmume": {
 		"name": "DeSmuME",
 		"directory": "desmume/src/frontend/libretro",
+		"owner": "Namaneo",
+		"branch": "advsc_has-database",
 		"systems": [
 			{
 				"name": "Nintendo DS",

ui/sources/pages/saves-page.jsx

@@ -40,9 +40,9 @@ export const SavesPage = () => {
 		document.body.appendChild(a);
 
 		const files = []
-		// for (const save of saves)
-		// 	for (const path of save.paths)
-		// 		files.push(await Database.file(path));
+		for (const save of saves)
+			for (const path of save.paths)
+				files.push(new File([await Files.read(path)], path));
 
 		const blob = await Zip.compress(files);
 
@@ -66,8 +66,10 @@ export const SavesPage = () => {
 
 		fileInput.current.value = '';
 
-		// for (const file of files)
-		// 	await Database.add(file.name, file);
+		for (const file of files) {
+			const buffer = new Uint8Array(await file.arrayBuffer());
+			await Files.write(file.name, buffer);
+		}
 
 		setSaves(await Files.Saves.get());
 	}

ui/sources/services/wasi.js

@@ -128,7 +128,7 @@ export const WASI_ENV = {
 	},
 	fd_read: (fd, iovs, iovs_len, nread) => {
 		if (fd < 3)
-			return __WASI_ERRNO_SUCCESS;
+			return __WASI_ERRNO_BADF;
 
 		const size = JUN.filesystem.size(JUN.fds[fd].path);
 		if (size == -1)
@@ -171,7 +171,7 @@ export const WASI_ENV = {
 				JUN.fds[fd].offset += Number(offset);
 				break;
 			case WHENCE_END:
-				JUN.fds[fd].offset = size - Number(offset);
+				JUN.fds[fd].offset = size + Number(offset);
 				break;
 		}