[Zucchini] Move Zucchini from /chrome/installer/ to /components/.

(Use "git log --follow" to see older revisions of files).

/components/ is the most logical place to put Zucchini, which only
depends on /base and /testing/gtest. This move also enables Zucchini to
be used by the Component Updater. Details:
- Move all files; run the following to change deps and guards:
  sed 's/chrome\/installer/components/' *.cc *.h -i
  sed 's/CHROME_INSTALLER/COMPONENTS/' *.cc *.h -i
  - Sorting works out pretty well!
- Change all 'chrome/installer/zucchini' to 'components/zucchini'
  throughout other parts of the repo; sort if necessary.
- Fix 6 'git cl lint' errors.
- Change 1 Bind() usage to BindRepeated().
- Update OWNER.

Bug: 729154
Change-Id: I50c5a7d411ea85f707b5994ab319dfb2a1acccf7
Reviewed-on: https://chromium-review.googlesource.com/954923
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542857}
NOKEYCHECK=True
GitOrigin-RevId: 577ef6c435e8d43be6e3e60ccbcbd1881780f4ec

1 files changed, 122 insertions, 0 deletions

diff --git a/zucchini_integration.cc b/zucchini_integration.cc
new file mode 100644
index 0000000..3ca4601
--- /dev/null
+++ b/zucchini_integration.cc
@@ -0,0 +1,122 @@
+// Copyright 2017 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.
+
+#include "components/zucchini/zucchini_integration.h"
+
+#include <utility>
+
+#include "base/logging.h"
+#include "components/zucchini/buffer_view.h"
+#include "components/zucchini/mapped_file.h"
+#include "components/zucchini/patch_reader.h"
+
+namespace zucchini {
+
+namespace {
+
+struct FileNames {
+  FileNames() : is_dummy(true) {
+    // Use fake names. If |is_dummy| is true these files are only used for error
+    // output.
+    old_name = old_name.AppendASCII("old_name");
+    patch_name = patch_name.AppendASCII("patch_name");
+    new_name = new_name.AppendASCII("new_name");
+  }
+
+  FileNames(const base::FilePath& old_name,
+            const base::FilePath& patch_name,
+            const base::FilePath& new_name)
+      : old_name(old_name),
+        patch_name(patch_name),
+        new_name(new_name),
+        is_dummy(false) {}
+
+  base::FilePath old_name;
+  base::FilePath patch_name;
+  base::FilePath new_name;
+  const bool is_dummy;
+};
+
+status::Code ApplyCommon(base::File&& old_file_handle,
+                         base::File&& patch_file_handle,
+                         base::File&& new_file_handle,
+                         const FileNames& names) {
+  MappedFileReader patch_file(std::move(patch_file_handle));
+  if (patch_file.HasError()) {
+    LOG(ERROR) << "Error with file " << names.patch_name.value() << ": "
+               << patch_file.error();
+    return status::kStatusFileReadError;
+  }
+
+  auto patch_reader =
+      zucchini::EnsemblePatchReader::Create(patch_file.region());
+  if (!patch_reader.has_value()) {
+    LOG(ERROR) << "Error reading patch header.";
+    return status::kStatusPatchReadError;
+  }
+
+  MappedFileReader old_file(std::move(old_file_handle));
+  if (old_file.HasError()) {
+    LOG(ERROR) << "Error with file " << names.old_name.value() << ": "
+               << old_file.error();
+    return status::kStatusFileReadError;
+  }
+  if (!patch_reader->CheckOldFile(old_file.region())) {
+    LOG(ERROR) << "Invalid old_file.";
+    return status::kStatusInvalidOldImage;
+  }
+
+  zucchini::PatchHeader header = patch_reader->header();
+  // By default, delete output on destruction, to avoid having lingering files
+  // in case of a failure. On Windows deletion can be done by the OS.
+  base::FilePath file_path;
+  if (!names.is_dummy)
+    file_path = base::FilePath(names.new_name);
+
+  MappedFileWriter new_file(file_path, std::move(new_file_handle),
+                            header.new_size);
+  if (new_file.HasError()) {
+    LOG(ERROR) << "Error with file " << names.new_name.value() << ": "
+               << new_file.error();
+    return status::kStatusFileWriteError;
+  }
+
+  zucchini::status::Code result =
+      zucchini::Apply(old_file.region(), *patch_reader, new_file.region());
+  if (result != status::kStatusSuccess) {
+    LOG(ERROR) << "Fatal error encountered while applying patch.";
+    return result;
+  }
+
+  // Successfully patch |new_file|. Explicitly request file to be kept.
+  if (!new_file.Keep())
+    return status::kStatusFileWriteError;
+  return status::kStatusSuccess;
+}
+
+}  // namespace
+
+status::Code Apply(base::File old_file_handle,
+                   base::File patch_file_handle,
+                   base::File new_file_handle) {
+  const FileNames file_names = FileNames();
+  return ApplyCommon(std::move(old_file_handle), std::move(patch_file_handle),
+                     std::move(new_file_handle), file_names);
+}
+
+status::Code Apply(const base::FilePath& old_path,
+                   const base::FilePath& patch_path,
+                   const base::FilePath& new_path) {
+  using base::File;
+  File old_file(old_path, File::FLAG_OPEN | File::FLAG_READ);
+  File patch_file(patch_path, File::FLAG_OPEN | File::FLAG_READ);
+  File new_file(new_path, File::FLAG_CREATE_ALWAYS | File::FLAG_READ |
+                              File::FLAG_WRITE | File::FLAG_SHARE_DELETE |
+                              File::FLAG_CAN_DELETE_ON_CLOSE);
+  const FileNames file_names(old_path, patch_path, new_path);
+  return ApplyCommon(std::move(old_file), std::move(patch_file),
+                     std::move(new_file), file_names);
+}
+
+}  // namespace zucchini