asidko · April 20, 2022 14:00 · Apr 20, 2022
diff --git a/gzip.js b/gzip.js
@@ -0,0 +1,46 @@
+// Paste the following example to browser console
+
+
+// Comppreses string to GZIP. Retruns a Promise with Base64 string
+const compress = string => {
+    const blobToBase64 = blob => new Promise((resolve, _) => {
+        const reader = new FileReader();
+        reader.onloadend = () => resolve(reader.result.split(',')[1]);
+        reader.readAsDataURL(blob);
+    });
+    const byteArray = new TextEncoder().encode(string);
+    const cs = new CompressionStream('gzip');
+    const writer = cs.writable.getWriter();
+    writer.write(byteArray);
+    writer.close();
+    return new Response(cs.readable).blob().then(blobToBase64);
+};
+
+// Decompresses base64 encoded GZIP string. Retruns a string with original text.
+const decompress = base64string => {
+    const bytes = Uint8Array.from(atob(base64string), c => c.charCodeAt(0));
+    const cs = new DecompressionStream('gzip');
+    const writer = cs.writable.getWriter();
+    writer.write(bytes);
+    writer.close();
+    return new Response(cs.readable).arrayBuffer().then(function (arrayBuffer) {
+        return new TextDecoder().decode(arrayBuffer);
+    });
+}
+
+/////////////////////
+// Checking
+/////////////////////
+Promise.resolve("Hello GZIP!")
+    .then(v => {
+        console.log("Original value: %s", v);
+        return v;
+    })
+    .then(v => compress(v))
+    .then(v => {
+        console.log("Compressed value: %s", v);
+        return v;
+    })
+    .then(v => decompress(v))
+    .then(v => console.log("Decomporessed value: %s", v));
+
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