Revert "BUG=12114"

chrome/browser/extensions/extension_creator.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CREATOR_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CREATOR_H_
 
 #include "base/command_line.h"
 #include "base/crypto/rsa_private_key.h"
 #include "base/file_path.h"
 #include "base/values.h"
 
 // This class create an installable extension (.crx file) given an input
 // directory that contains a valid manifest.json and the extension's resources
 // contained within that directory. The output .crx file is always signed with a
 // private key that is either provided in |private_key_path| or is internal
 // generated randomly (and optionally written to |output_private_key_path|.
 class ExtensionCreator {
  public:
+  // The size of the magic character sequence at the beginning of each crx file,
+  // in bytes. This should be a multiple of 4.
+  static const size_t kExtensionHeaderMagicSize = 4;
+
+  // The magic character sequence at the beginning of each crx file.
+  static const char kExtensionHeaderMagic[];
+
+  // The current version of the crx format.
+  static const uint32 kCurrentVersion = 2;
+
+  // This header is the first data at the beginning of an extension. Its
+  // contents are purposely 32-bit aligned so that it can just be slurped into
+  // a struct without manual parsing.
+  struct ExtensionHeader {
+    char magic[kExtensionHeaderMagicSize];
+    uint32 version;
+    size_t key_size;  // The size of the public key, in bytes.
+    size_t signature_size;  // The size of the signature, in bytes.
+    // An ASN.1-encoded PublicKeyInfo structure follows.
+    // The signature follows.
+  };
+
   ExtensionCreator() {}
 
   bool Run(const FilePath& extension_dir,
            const FilePath& crx_path,
            const FilePath& private_key_path,
            const FilePath& private_key_output_path);
 
   // Returns the error message that will be present if Run(...) returned false.
   std::string error_message() { return error_message_; }
 
@@ skipping 28 matching lines @@
                 const std::vector<uint8>& signature,
                 const FilePath& crx_path);
 
   // Holds a message for any error that is raised during Run(...).
   std::string error_message_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionCreator);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CREATOR_H_