Differential updates for components.

chrome/browser/component_updater/component_unpacker.h

 // Copyright (c) 2012 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_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
 
+#include <string>
 #include <vector>
-
+#include "base/basictypes.h"
 #include "base/files/file_path.h"
 
 class ComponentInstaller;
+class ComponentPatcher;
 
 // In charge of unpacking the component CRX package and verifying that it is
 // well formed and the cryptographic signature is correct. If there is no
 // error the component specific installer will be invoked to proceed with
 // the component installation or update.
 //
 // This class should be used only by the component updater. It is inspired
 // and overlaps with code in the extension's SandboxedUnpacker.
 // The main differences are:
 // - The public key hash is full SHA256.
 // - Does not use a sandboxed unpacker. A valid component is fully trusted.
 // - The manifest can have different attributes and resources are not
 //   transcoded.
 class ComponentUnpacker {
  public:
   // Possible error conditions.
+  // Add only to the bottom of this enum; the order must be kept stable.
   enum Error {
     kNone,
     kInvalidParams,
     kInvalidFile,
-    kUzipPathError,
+    kUnzipPathError,
     kUnzipFailed,
     kNoManifest,
     kBadManifest,
     kBadExtension,
     kInvalidId,
     kInstallerError,
+    kIoError,
+    kDeltaVerificationFailure,
+    kDeltaBadCommands,
+    kDeltaUnsupportedCommand,
+    kDeltaOperationFailure,
+    kDeltaPatchProcessFailure,
+    kDeltaMissingExistingFile,
+    kFingerprintWriteFailed,
   };
   // Unpacks, verifies and calls the installer. |pk_hash| is the expected
   // public key SHA256 hash. |path| is the current location of the CRX.
   ComponentUnpacker(const std::vector<uint8>& pk_hash,
                     const base::FilePath& path,
+                    const std::string& fingerprint,
+                    ComponentPatcher* patcher,
                     ComponentInstaller* installer);
 
   // If something went wrong during unpacking or installer invocation, the
   // destructor will delete the unpacked CRX files.
   ~ComponentUnpacker();
 
   Error error() const { return error_; }
 
+  int extended_error() const { return extended_error_; }
+
  private:
   base::FilePath unpack_path_;
   Error error_;
+  int extended_error_;  // Provides additional error information.
 };
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_