add old v0.4 code

client/javascript/util.js

@@ -0,0 +1,70 @@
+//a case insensitive dictionary for request headers
+class HeadersDict {
+  constructor(obj) {
+    for (let key in obj) {
+      this[key] = obj[key];
+    }
+    return new Proxy(this, this);
+  }
+  get(target, prop) {
+    let keys = Object.keys(this);
+    for (let key of keys) {
+      if (key.toLowerCase() === prop.toLowerCase()) {
+        return this[key];
+      }
+    }
+  }
+  set(target, prop, value) {
+    let keys = Object.keys(this);
+    for (let key of keys) {
+      if (key.toLowerCase() === prop.toLowerCase()) {
+        this[key] = value;
+      }
+    }
+    this[prop] = value;
+    return true;
+  }
+}
+
+function allocate_str(str) {
+  return allocate(intArrayFromString(str), ALLOC_NORMAL);
+}
+
+function allocate_array(array) {
+  return allocate(array, ALLOC_NORMAL);
+}
+
+//convert any data to a uint8array
+function any_to_array(data) {
+  let data_array;
+  if (typeof data === "string") {
+    data_array = new TextEncoder().encode(data);
+  }
+  else if (data instanceof Blob) {
+    data.arrayBuffer().then(array_buffer => {
+      data_array = new Uint8Array(array_buffer);
+      this.send(data_array);
+    });
+    return;
+  }
+  //any typedarray
+  else if (data instanceof ArrayBuffer) {
+    //dataview objects
+    if (ArrayBuffer.isView(data) && data instanceof DataView) {
+      data_array = new Uint8Array(data.buffer);
+    }
+    //regular arraybuffers
+    else {
+      data_array = new Uint8Array(data);
+    }
+  }
+  //regular typed arrays
+  else if (ArrayBuffer.isView(data)) {
+    data_array = Uint8Array.from(data);
+  }
+  else {
+    throw "invalid data type";
+  }
+
+  return data_array;
+}