first cut: establishes base helper classes and main

active_main_firmware.cc

Index: active_main_firmware.cc
diff --git a/active_main_firmware.cc b/active_main_firmware.cc
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index 0000000000000000000000000000000000000000..c44cfa9e5160cd0b456b6e2839efcee418a29dd9
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+++ b/active_main_firmware.cc
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+// Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// ActiveMainFirmware implementation
+
+#include "active_main_firmware.h"
+
+#include <sys/types.h>
+
+#include "helpers.h"
+
+namespace cros_boot_mode {
+
+const char *ActiveMainFirmware::kActiveMainFirmwareText[] = {
+ "recovery",
+ "a",
+ "b",
+};
+
+const char *ActiveMainFirmware::c_str() const {
+  return (value() >= 0 ? kActiveMainFirmwareText[value()] : "unsupported");
+}
+
+const size_t ActiveMainFirmware::kActiveMainFirmwareCount =
+  sizeof(kActiveMainFirmwareText) / sizeof(*kActiveMainFirmwareText);
+
+ActiveMainFirmware::ActiveMainFirmware() { }
+ActiveMainFirmware::~ActiveMainFirmware() { }
+
+int ActiveMainFirmware::Process(const char *contents, size_t length) {
+  int volume = helpers::to_int(contents, length);
+  if (volume >= 0 &&
+      volume < static_cast<int>(kActiveMainFirmwareCount))
+    return volume;
+  return kUnsupported;
+}
+
+}  // namespace cros_boot_mode