Differential updates for components.

chrome/browser/component_updater/component_patcher_operation.h

Index: chrome/browser/component_updater/component_patcher_operation.h
diff --git a/chrome/browser/component_updater/component_patcher_operation.h b/chrome/browser/component_updater/component_patcher_operation.h
new file mode 100644
index 0000000000000000000000000000000000000000..b41fbd258113f9fbf324957618ab9ad00467b9de
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+++ b/chrome/browser/component_updater/component_patcher_operation.h
@@ -0,0 +1,158 @@
+// Copyright (c) 2013 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_PATCHER_OPERATION_H_
+#define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_PATCHER_OPERATION_H_
+
+#include <string>
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/component_updater/component_unpacker.h"
+
+namespace base {
+
+class FilePath;
+class DictionaryValue;
+
+}  // namespace base
+
+class ComponentInstaller;
+class ComponentPatcher;
+
+class DeltaUpdateOp {
+ public:
+
+  DeltaUpdateOp();
+  virtual ~DeltaUpdateOp();
+
+  // Parses, runs, and verifies the operation, returning an error code if an
+  // error is encountered, and DELTA_OK otherwise. In case of errors,
+  // extended error information can be returned in the |error| parameter.
+  ComponentUnpacker::Error Run(
+      base::DictionaryValue* command_args,
+      const base::FilePath& input_dir,
+      const base::FilePath& unpack_dir,
+      ComponentPatcher* patcher,
+      ComponentInstaller* installer,
+      int* error);
+
+ protected:
+  std::string output_sha256_;
+  base::FilePath output_abs_path_;
+
+ private:
+  ComponentUnpacker::Error CheckHash();
+
+  // Subclasses must override DoParseArguments to parse operation-specific
+  // arguments. DoParseArguments returns DELTA_OK on success; any other code
+  // represents failure.
+  virtual ComponentUnpacker::Error DoParseArguments(
+      base::DictionaryValue* command_args,
+      const base::FilePath& input_dir,
+      ComponentInstaller* installer) = 0;
+
+  // Subclasses must override DoRun to actually perform the patching operation.
+  // DoRun returns DELTA_OK on success; any other code represents failure.
+  // Additional error information can be returned in the |error| parameter.
+  virtual ComponentUnpacker::Error DoRun(ComponentPatcher* patcher,
+                                         int* error) = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOp);
+};
+
+// A 'copy' operation takes a file currently residing on the disk and moves it
+// into the unpacking directory: this represents "no change" in the file being
+// installed.
+class DeltaUpdateOpCopy : public DeltaUpdateOp {
+ public:
+  DeltaUpdateOpCopy();
+
+ private:
+  // Overrides of DeltaUpdateOp.
+  virtual ComponentUnpacker::Error DoParseArguments(
+      base::DictionaryValue* command_args,
+      const base::FilePath& input_dir,
+      ComponentInstaller* installer) OVERRIDE;
+
+  virtual ComponentUnpacker::Error DoRun(ComponentPatcher* patcher,
+                                         int* error) OVERRIDE;
+
+  base::FilePath input_abs_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpCopy);
+};
+
+// A 'create' operation takes a full file that was sent in the delta update
+// archive and moves it into the unpacking directory: this represents the
+// addition of a new file, or a file so different that no bandwidth could be
+// saved by transmitting a differential update.
+class DeltaUpdateOpCreate : public DeltaUpdateOp {
+ public:
+  DeltaUpdateOpCreate();
+
+ private:
+  // Overrides of DeltaUpdateOp.
+  virtual ComponentUnpacker::Error DoParseArguments(
+      base::DictionaryValue* command_args,
+      const base::FilePath& input_dir,
+      ComponentInstaller* installer) OVERRIDE;
+
+  virtual ComponentUnpacker::Error DoRun(ComponentPatcher* patcher,
+                                         int* error) OVERRIDE;
+
+  base::FilePath patch_abs_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpCreate);
+};
+
+// A 'bsdiff' operation takes an existing file on disk, and a bsdiff-
+// format patch file provided in the delta update package, and runs bsdiff
+// to construct an output file in the unpacking directory.
+class DeltaUpdateOpPatchBsdiff : public DeltaUpdateOp {
+ public:
+  DeltaUpdateOpPatchBsdiff();
+
+ private:
+  // Overrides of DeltaUpdateOp.
+  virtual ComponentUnpacker::Error DoParseArguments(
+      base::DictionaryValue* command_args,
+      const base::FilePath& input_dir,
+      ComponentInstaller* installer) OVERRIDE;
+
+  virtual ComponentUnpacker::Error DoRun(ComponentPatcher* patcher,
+                                         int* error) OVERRIDE;
+
+  base::FilePath patch_abs_path_;
+  base::FilePath input_abs_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpPatchBsdiff);
+};
+
+// A 'courgette' operation takes an existing file on disk, and a Courgette-
+// format patch file provided in the delta update package, and runs Courgette
+// to construct an output file in the unpacking directory.
+class DeltaUpdateOpPatchCourgette : public DeltaUpdateOp {
+ public:
+  DeltaUpdateOpPatchCourgette();
+
+ private:
+  // Overrides of DeltaUpdateOp.
+  virtual ComponentUnpacker::Error DoParseArguments(
+      base::DictionaryValue* command_args,
+      const base::FilePath& input_dir,
+      ComponentInstaller* installer) OVERRIDE;
+
+  virtual ComponentUnpacker::Error DoRun(ComponentPatcher* patcher,
+                                         int* error) OVERRIDE;
+
+  base::FilePath patch_abs_path_;
+  base::FilePath input_abs_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeltaUpdateOpPatchCourgette);
+};
+
+// Factory function to create DeltaUpdateOp instances.
+DeltaUpdateOp* CreateDeltaUpdateOp(base::DictionaryValue* command);
+
+#endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_PATCHER_OPERATION_H_