minor fixes found from issues

adm-zip.js

@@ -429,7 +429,7 @@ module.exports = function (/**String*/ input, /** object */ options) {
             // prepare new entry
             if (!update) {
                 entry = new ZipEntry();
-                entry.entryName = entryName;
+                entry.entryName = Utils.canonical(entryName);
             }
             entry.comment = comment || "";
 
@@ -464,6 +464,8 @@ module.exports = function (/**String*/ input, /** object */ options) {
 
             entry.setData(content);
             if (!update) _zip.setEntry(entry);
+
+            return entry;
         },
 
         /**

package.json

@@ -37,7 +37,7 @@
     "url": "https://github.com/cthackers/adm-zip.git"
   },
   "engines": {
-    "node": ">=6.0"
+    "node": ">=12.0"
   },
   "devDependencies": {
     "chai": "^4.3.4",

test/mocha.js

@@ -218,6 +218,16 @@ describe("adm-zip", () => {
         fs.unlinkSync("./text.txt");
     });
 
+    it("passes issue-438-AddFile with windows path sepator", () => {
+        const zip = new Zip();
+        zip.addFile("foo\\bar.txt", "test", "test");
+        zip.extractAllTo(destination);
+
+        const files = walk(destination);
+
+        expect(files.sort()).to.deep.equal([pth.normalize("./test/xxx/foo/bar.txt")].sort());
+    });
+
     it("testing noSort option", () => {
         const content = "test";
         const comment = "comment";

zipEntry.js

@@ -12,7 +12,8 @@ module.exports = function (/*Buffer*/ input) {
         _extra = Buffer.alloc(0);
 
     function getCompressedDataFromZip() {
-        if (!input || !Buffer.isBuffer(input)) {
+        //if (!input || !Buffer.isBuffer(input)) {
+        if (!input || !(input instanceof Uint8Array)) {
             return Buffer.alloc(0);
         }
         _centralHeader.loadLocalHeaderFromBinary(input);