Mojo: Use network service to load non-local Mojo Apps.

mojo/common/data_pipe_utils.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/common/data_pipe_utils.h"
+
+#include <stdio.h>
+
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/files/scoped_file.h"
+#include "base/message_loop/message_loop.h"
+#include "base/task_runner_util.h"
+#include "mojo/common/handle_watcher.h"
+
+namespace mojo {
+namespace common {
+
+bool BlockingCopyToFile(ScopedDataPipeConsumerHandle source,
+                        const base::FilePath& destination) {
+  base::ScopedFILE fp(base::OpenFile(destination, "wb"));
+  if (!fp)
+    return false;
+
+  for (;;) {
+    const void* buffer;
+    uint32_t num_bytes;
+    MojoResult result = BeginReadDataRaw(source.get(), &buffer, &num_bytes,
+                                         MOJO_READ_DATA_FLAG_NONE);
+    if (result == MOJO_RESULT_OK) {
+      fwrite(buffer, 1, num_bytes, fp.get());
+      result = EndReadDataRaw(source.get(), num_bytes);
+      if (result != MOJO_RESULT_OK)
+        return false;
+    } else if (result == MOJO_RESULT_SHOULD_WAIT) {
+      result = Wait(source.get(),
+                    MOJO_WAIT_FLAG_READABLE,
+                    MOJO_DEADLINE_INDEFINITE);
+      if (result != MOJO_RESULT_OK) {
+        // If the producer handle was closed, then treat as EOF.
+        return result == MOJO_RESULT_FAILED_PRECONDITION;
+      }
+    } else if (result == MOJO_RESULT_FAILED_PRECONDITION) {
+      // If the producer handle was closed, then treat as EOF.
+      return true;
+    } else {
+      // Some other error occurred.
+      break;
+    }
+  }
+
+  return false;
+}
+
+void CompleteBlockingCopyToFile(const base::Callback<void(bool)>& callback,
+                                bool result) {
+  callback.Run(result);
+}
+
+void CopyToFile(ScopedDataPipeConsumerHandle source,
+                const base::FilePath& destination,
+                base::TaskRunner* task_runner,
+                const base::Callback<void(bool)>& callback) {
+  base::PostTaskAndReplyWithResult(
+      task_runner,
+      FROM_HERE,
+      base::Bind(&BlockingCopyToFile, base::Passed(&source), destination),
+      callback);
+}
+
+}  // namespace common
+}  // namespace mojo