remove emscripten socket file descriptor limit

client/javascript/ftp.js

@@ -0,0 +1,44 @@
+//unfinished!
+
+class FTPSession {
+  constructor(url, options={}) {
+    if (!url.startsWith("ftp://") || !url.startsWith("ftps://")) {
+      throw "invalid url protocol";
+    }
+
+    this.url = url;
+    this.cwd = new URL(url).pathname;
+    this.options = options;
+    this.http_handle = null;
+  }
+
+  do_request(url) {
+    return new Promise((resolve, reject) => {
+      let http_handle;
+      let data_callback = (data) => {this.data_callback(data)};
+      let finish_callback = (error) => {
+        _cleanup_handle(http_handle);
+        if (error) {
+          reject();
+        }
+        else {
+          resolve();
+        }
+      };
+      let headers_callback = () => {this.headers_callback()};
+
+      http_handle = create_handle(url, data_callback, finish_callback, headers_callback);
+      _ftp_set_options(http_handle, url, 1);
+      start_request(http_handle);
+    });
+  }
+
+  async download(path) {
+    let url = new URL(path, this.url);
+    _ftp_set_options(this.http_handle, url, 0);
+  }
+
+  cleanup() {
+
+  }
+}