add turbowarp unpackager

.gitmodules

@@ -25,3 +25,6 @@
 [submodule "src/handlers/gimper"]
 	path = src/handlers/gimper
 	url = https://github.com/ConnorTippets/gimper.git
+[submodule "src/handlers/turbowarp/unpackager"]
+	path = src/handlers/turbowarp/unpackager
+	url = https://github.com/TurboWarp/unpackager.git

package.json

@@ -68,6 +68,7 @@
     "@sqlite.org/sqlite-wasm": "^3.51.2-build6",
     "@stringsync/vexml": "^0.1.8",
     "@toon-format/toon": "^2.1.0",
+    "@turbowarp/unpackager": "./src/handlers/turbowarp/unpackager",
     "@types/bun": "^1.3.9",
     "@types/meyda": "^5.3.0",
     "@types/pako": "^2.0.4",

src/handlers/turbowarp.ts

@@ -3,6 +3,7 @@
 import type { FileData, FileFormat, FormatHandler } from "../FormatHandler.ts";
 import CommonFormats from "src/CommonFormats.ts";
 import { Packager, largeAssets, downloadProject } from "turbowarp-packager-browser";
+import unpackager from "@turbowarp/unpackager";
 
 // patching some assets
 largeAssets.scaffolding.src = "/convert/js/turbowarp-scaffolding/scaffolding-full.js";
@@ -19,13 +20,15 @@ class turbowarpHandler implements FormatHandler {
       extension: "sb3",
       mime: "application/x.scratch.sb3",
       from: true,
-      to: false,
+      to: true,
       internal: "sb3",
       category: "archive",
-      lossless: false,
+      lossless: true, // all project data is in the html 
     },
     CommonFormats.HTML.builder("html")
       .allowTo()
+      .allowFrom()
+      .markLossless()
   ];
   public ready: boolean = false;
 
@@ -40,18 +43,29 @@ class turbowarpHandler implements FormatHandler {
   ): Promise<FileData[]> {
     const outputFiles: FileData[] = [];
     for (const inputFile of inputFiles) {
-      const project = await downloadProject(inputFile.bytes);
-
-      const packager = new Packager();
-      packager.project = project;
-      packager.options.target = "html";
-
-      const bytes = (await packager.package()).data;
-
-      outputFiles.push({ 
-        name: inputFile.name.replace(/\.sb3$/, ".html"), 
-        bytes 
-      });
+      if (inputFormat.internal === "sb3") {
+        const project = await downloadProject(inputFile.bytes);
+
+        const packager = new Packager();
+        packager.project = project;
+        packager.options.target = "html";
+
+        const bytes = (await packager.package()).data;
+
+        outputFiles.push({ 
+          name: inputFile.name.replace(/\.sb3$/, ".html"), 
+          bytes 
+        });
+      } else if (inputFormat.internal === "html") {
+        const data = (await unpackager(inputFile.bytes)).data;
+        const bytes = new Uint8Array(data);
+        outputFiles.push({ 
+          name: inputFile.name.replace(/\.html$/, ".sb3"), 
+          bytes
+        });
+      } else {
+        throw new Error(`turbowarpHandler cannot convert from ${inputFormat.mime} to ${outputFormat.mime}`);
+      }
     }
     return outputFiles;
   }

src/handlers/turbowarp/unpackager.d.ts

@@ -0,0 +1,5 @@
+declare module '@turbowarp/unpackager' {
+  function unpackage(data: Uint8Array): Promise<{ data: Uint8Array }>;
+
+  export default unpackage;
+}