fix #394 don't mangle binary files

Author: gjsjohnmurray

src/providers/FileSystemPovider/File.ts

@@ -8,13 +8,13 @@ export class File implements vscode.FileStat {
   public fileName: string;
   public name: string;
   public data?: Uint8Array;
-  public constructor(name: string, fileName: string, ts: string, size: number, data: string) {
+  public constructor(name: string, fileName: string, ts: string, size: number, data: string | Buffer) {
     this.type = vscode.FileType.File;
     this.ctime = new Date(ts).getTime();
     this.mtime = new Date(ts).getTime();
     this.size = size;
     this.fileName = fileName;
     this.name = name;
-    this.data = Buffer.from(data);
+    this.data = typeof data === "string" ? Buffer.from(data) : data;
   }
 }

src/providers/FileSystemPovider/FileSystemProvider.ts

@@ -336,8 +336,8 @@ export class FileSystemProvider implements vscode.FileSystemProvider {
             name,
             fileName,
             ts,
-            Array.isArray(content) ? content.join("\n").length : String(content).length,
-            Array.isArray(content) ? content.join("\n") : String(content)
+            Array.isArray(content) ? content.join("\n").length : content.length,
+            Array.isArray(content) ? content.join("\n") : content
           )
       )
       .then((entry) =>