diff --git a/cros/omaha_response.h b/cros/omaha_response.h
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+//
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_CROS_OMAHA_RESPONSE_H_
+#define UPDATE_ENGINE_CROS_OMAHA_RESPONSE_H_
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <limits>
+#include <string>
+#include <vector>
+
+namespace chromeos_update_engine {
+
+// This struct encapsulates the data Omaha's response for the request.
+// The strings in this struct are not XML escaped.
+struct OmahaResponse {
+  // True iff there is an update to be downloaded.
+  bool update_exists = false;
+
+  // If non-zero, server-dictated poll interval in seconds.
+  int poll_interval = 0;
+
+  // These are only valid if update_exists is true:
+  std::string version;
+
+  struct Package {
+    // The ordered list of URLs in the Omaha response. Each item is a complete
+    // URL (i.e. in terms of Omaha XML, each value is a urlBase + packageName)
+    std::vector<std::string> payload_urls;
+    uint64_t size = 0;
+    uint64_t metadata_size = 0;
+    std::string metadata_signature;
+    std::string hash;
+    // True if the payload described in this response is a delta payload.
+    // False if it's a full payload.
+    bool is_delta = false;
+    // True if the payload can be excluded from updating if consistently faulty.
+    // False if the payload is critical to update.
+    bool can_exclude = false;
+    // The App ID associated with the package.
+    std::string app_id;
+  };
+  std::vector<Package> packages;
+
+  std::string more_info_url;
+  std::string deadline;
+  int max_days_to_scatter = 0;
+  // The number of URL-related failures to tolerate before moving on to the
+  // next URL in the current pass. This is a configurable value from the
+  // Omaha Response attribute, if ever we need to fine tune the behavior.
+  uint32_t max_failure_count_per_url = 0;
+  bool prompt = false;
+
+  // True if the Omaha rule instructs us to disable the back-off logic
+  // on the client altogether. False otherwise.
+  bool disable_payload_backoff = false;
+
+  // True if the Omaha rule instructs us to disable p2p for downloading.
+  bool disable_p2p_for_downloading = false;
+
+  // True if the Omaha rule instructs us to disable p2p for sharing.
+  bool disable_p2p_for_sharing = false;
+
+  // True if the Omaha rule instructs us to powerwash.
+  bool powerwash_required = false;
+
+  // If not blank, a base-64 encoded representation of the PEM-encoded
+  // public key in the response.
+  std::string public_key_rsa;
+
+  // If not -1, the number of days since the epoch Jan 1, 2007 0:00
+  // PST, according to the Omaha Server's clock and timezone (PST8PDT,
+  // aka "Pacific Time".)
+  int install_date_days = -1;
+
+  // True if the returned image is a rollback for the device.
+  bool is_rollback = false;
+
+  struct RollbackKeyVersion {
+    // Kernel key version. 0xffff if the value is unknown.
+    uint16_t kernel_key = std::numeric_limits<uint16_t>::max();
+    // Kernel version. 0xffff if the value is unknown.
+    uint16_t kernel = std::numeric_limits<uint16_t>::max();
+    // Firmware key verison. 0xffff if the value is unknown.
+    uint16_t firmware_key = std::numeric_limits<uint16_t>::max();
+    // Firmware version. 0xffff if the value is unknown.
+    uint16_t firmware = std::numeric_limits<uint16_t>::max();
+  };
+
+  // Key versions of the returned rollback image. Values are 0xffff if the
+  // image not a rollback, or the fields were not present.
+  RollbackKeyVersion rollback_key_version;
+
+  // Key versions of the N - rollback_allowed_milestones release. For example,
+  // if the current version is 70 and rollback_allowed_milestones is 4, this
+  // will contain the key versions of version 66. This is used to ensure that
+  // the kernel and firmware keys are at most those of v66 so that v66 can be
+  // rolled back to.
+  RollbackKeyVersion past_rollback_key_version;
+};
+static_assert(sizeof(off_t) == 8, "off_t not 64 bit");
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_CROS_OMAHA_RESPONSE_H_