first cut: establishes base helper classes and main

bootloader_type.h

Index: bootloader_type.h
diff --git a/bootloader_type.h b/bootloader_type.h
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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.
+//
+// Defines the BootloaderType class.  This class wraps the kernel commandline
+// to determine the bootloader type.  Our bootloaders are configured to boot
+// with identifying kernel command lines:
+// - EFI uses cros_efi
+// - Legacy uses cros_legacy
+// - Chrome OS uses cros_secure
+// - A debug override can use cros_debug.
+// This done by walking /proc/cmdline.
+//
+#ifndef CROS_BOOT_MODE_BOOTLOADER_TYPE_H_
+#define CROS_BOOT_MODE_BOOTLOADER_TYPE_H_
+
+#include <sys/types.h>
+
+#include "platform_reader.h"
+
+namespace cros_boot_mode {
+
+class BootloaderType : public PlatformReader {
+ public:
+  static const char *kBootloaderTypePath;
+  enum {
+    kChromeOS = 0,
+    kEFI,
+    kLegacy,
+    kDebug,
+  };
+  // API-exposed names
+  static const char *kBootloaderTypeText[];
+  static const size_t kBootloaderTypeCount;
+  // Maximum allowed /proc/cmdline size.
+  static const int kMaxKernelCmdlineSize;
+  // Functional names found in /proc/cmdline.
+  static const char *kSupportedBootloaders[];
+
+
+  BootloaderType();
+  virtual ~BootloaderType();
+
+  // Process walks over the /proc/cmdline and converts it to the enum
+  // above.  The conversion is done by finding the first match in
+  // kSupportedBootloaders and then emits the enum that corresponds to
+  // the matching array index (or kUnsupported).
+  virtual int Process(const char *contents, size_t length);
+  virtual const char *name() const {
+    return "bootloader_type";
+  }
+  virtual const char *c_str() const {
+    return (value() >= 0 ? kBootloaderTypeText[value()] : "unsupported");
+  }
+  virtual const char *default_platform_file_path() const {
+    return "/proc/cmdline";
+  }
+  virtual size_t max_size() const {
+    return kMaxKernelCmdlineSize;
+  }
+};
+
+}  // namespace cros_boot_mode
+#endif  // CROS_BOOT_MODE_BOOTLOADER_TYPE_H_