1 files changed, 98 insertions, 0 deletions
diff --git a/toolkit/modules/subprocess/subprocess_shared.js b/toolkit/modules/subprocess/subprocess_shared.js
new file mode 100644
index 000000000..2661096c8
--- /dev/null
+++ b/toolkit/modules/subprocess/subprocess_shared.js
@@ -0,0 +1,98 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+/* exported Library, SubprocessConstants */
+
+if (!ArrayBuffer.transfer) {
+  /**
+   * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/transfer
+   *
+   * @param {ArrayBuffer} buffer
+   * @param {integer} [size = buffer.byteLength]
+   * @returns {ArrayBuffer}
+   */
+  ArrayBuffer.transfer = function(buffer, size = buffer.byteLength) {
+    let u8out = new Uint8Array(size);
+    let u8buffer = new Uint8Array(buffer, 0, Math.min(size, buffer.byteLength));
+
+    u8out.set(u8buffer);
+
+    return u8out.buffer;
+  };
+}
+
+var libraries = {};
+
+class Library {
+  constructor(name, names, definitions) {
+    if (name in libraries) {
+      return libraries[name];
+    }
+
+    for (let name of names) {
+      try {
+        if (!this.library) {
+          this.library = ctypes.open(name);
+        }
+      } catch (e) {
+        // Ignore errors until we've tried all the options.
+      }
+    }
+    if (!this.library) {
+      throw new Error("Could not load libc");
+    }
+
+    libraries[name] = this;
+
+    for (let symbol of Object.keys(definitions)) {
+      this.declare(symbol, ...definitions[symbol]);
+    }
+  }
+
+  declare(name, ...args) {
+    Object.defineProperty(this, name, {
+      configurable: true,
+      get() {
+        Object.defineProperty(this, name, {
+          configurable: true,
+          value: this.library.declare(name, ...args),
+        });
+
+        return this[name];
+      },
+    });
+  }
+}
+
+/**
+ * Holds constants which apply to various Subprocess operations.
+ * @namespace
+ * @lends Subprocess
+ */
+const SubprocessConstants = {
+  /**
+   * @property {integer} ERROR_END_OF_FILE
+   *           The operation failed because the end of the file was reached.
+   *           @constant
+   */
+  ERROR_END_OF_FILE: 0xff7a0001,
+  /**
+   * @property {integer} ERROR_INVALID_JSON
+   *           The operation failed because an invalid JSON was encountered.
+   *           @constant
+   */
+  ERROR_INVALID_JSON: 0xff7a0002,
+  /**
+   * @property {integer} ERROR_BAD_EXECUTABLE
+   *           The operation failed because the given file did not exist, or
+   *           could not be executed.
+   *           @constant
+   */
+  ERROR_BAD_EXECUTABLE: 0xff7a0003,
+};
+
+Object.freeze(SubprocessConstants);