1 files changed, 135 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/byte-streams.js b/tools/addon-sdk-1.3/packages/api-utils/lib/byte-streams.js
new file mode 100644
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+++ b/tools/addon-sdk-1.3/packages/api-utils/lib/byte-streams.js
@@ -0,0 +1,135 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim:set ts=2 sw=2 sts=2 et filetype=javascript
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is
+ * the Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Drew Willcoxon <adw@mozilla.com> (Original Author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+"use strict";
+
+exports.ByteReader = ByteReader;
+exports.ByteWriter = ByteWriter;
+
+const {Cc, Ci} = require("chrome");
+
+// This just controls the maximum number of bytes we read in at one time.
+const BUFFER_BYTE_LEN = 0x8000;
+
+function ByteReader(inputStream) {
+  const self = this;
+
+  let stream = Cc["@mozilla.org/binaryinputstream;1"].
+               createInstance(Ci.nsIBinaryInputStream);
+  stream.setInputStream(inputStream);
+
+  let manager = new StreamManager(this, stream);
+
+  this.read = function ByteReader_read(numBytes) {
+    manager.ensureOpened();
+    if (typeof(numBytes) !== "number")
+      numBytes = Infinity;
+
+    let data = "";
+    let read = 0;
+    try {
+      while (true) {
+        let avail = stream.available();
+        let toRead = Math.min(numBytes - read, avail, BUFFER_BYTE_LEN);
+        if (toRead <= 0)
+          break;
+        data += stream.readBytes(toRead);
+        read += toRead;
+      }
+    }
+    catch (err) {
+      throw new Error("Error reading from stream: " + err);
+    }
+
+    return data;
+  };
+}
+
+function ByteWriter(outputStream) {
+  const self = this;
+
+  let stream = Cc["@mozilla.org/binaryoutputstream;1"].
+               createInstance(Ci.nsIBinaryOutputStream);
+  stream.setOutputStream(outputStream);
+
+  let manager = new StreamManager(this, stream);
+
+  this.write = function ByteWriter_write(str) {
+    manager.ensureOpened();
+    try {
+      stream.writeBytes(str, str.length);
+    }
+    catch (err) {
+      throw new Error("Error writing to stream: " + err);
+    }
+  };
+}
+
+
+// This manages the lifetime of stream, a ByteReader or ByteWriter.  It defines
+// closed and close() on stream and registers an unload listener that closes
+// rawStream if it's still opened.  It also provides ensureOpened(), which
+// throws an exception if the stream is closed.
+function StreamManager(stream, rawStream) {
+  const self = this;
+  this.rawStream = rawStream;
+  this.opened = true;
+
+  stream.__defineGetter__("closed", function stream_closed() {
+    return !self.opened;
+  });
+
+  stream.close = function stream_close() {
+    self.ensureOpened();
+    self.unload();
+  };
+
+  require("./unload").ensure(this);
+}
+
+StreamManager.prototype = {
+  ensureOpened: function StreamManager_ensureOpened() {
+    if (!this.opened)
+      throw new Error("The stream is closed and cannot be used.");
+  },
+  unload: function StreamManager_unload() {
+    this.rawStream.close();
+    this.opened = false;
+  }
+};