amir-arad · July 22, 2022 18:53 · Jul 22, 2022 · Jul 22, 2022
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-I'm adding a save/load feature to my WIP game and thought someone here might find this small module useful
+I'm adding a save/load feature to my WIP game and thought someone might find this small module useful
 
 example usage:
 ```typescript

diff --git a/README.md b/README.md
@@ -0,0 +1,13 @@
+I'm adding a save/load feature to my WIP game and thought someone here might find this small module useful
+
+example usage:
+```typescript
+const saveGameData = new SaveGame(); // make a custom schema for saved games data
+... /* add all state objects from your game manager to saveGameData */
+const serialized = await schemaToString(saveGameData);
+... /* save to file, read from file etc. */
+const loadedGameData: SaveGame = await stringToSchema(SaveGame, serialized );
+... /* take game state object from loadedGameData into your game manager */
+```
+
+https://raw.githubusercontent.com/starwards/starwards/1a35eea8aacb80ef704df9bbd246a115f653b042/modules/server/src/serialization/game-state-serialization.ts
diff --git a/schema-serialization.ts b/schema-serialization.ts
@@ -0,0 +1,20 @@
+import { gzip, unzip } from 'node:zlib';
+
+import { Schema } from '@colyseus/schema';
+import { promisify } from 'node:util';
+
+const do_gzip = promisify(gzip);
+const do_unzip = promisify(unzip);
+
+export async function schemaToString(fragment: Schema) {
+    const zipped = await do_gzip(Buffer.from(fragment.encodeAll()));
+    return zipped.toString('base64');
+}
+type Constructor<T extends Schema> = new (...args: unknown[]) => T;
+
+export async function stringToSchema<T extends Schema>(ctor: Constructor<T>, serialized: string) {
+    const unzipped = await do_unzip(Buffer.from(serialized, 'base64'));
+    const result = new ctor();
+    result.decode([...unzipped]);
+    return result;
+}
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