Add lz4diff patch routines

Test: th
Bug: 206729162

Change-Id: I76a404e233e7683812bac65520c6c065e9a1ffe2

1 files changed, 50 insertions, 0 deletions

diff --git a/lz4diff/lz4patch.h b/lz4diff/lz4patch.h
new file mode 100644
index 00000000..56108917
--- /dev/null
+++ b/lz4diff/lz4patch.h
@@ -0,0 +1,50 @@
+//
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_LZ4DIFF_LZ4PATCH_H_
+#define UPDATE_ENGINE_LZ4DIFF_LZ4PATCH_H_
+
+#include "lz4diff_format.h"
+
+namespace chromeos_update_engine {
+bool Lz4Patch(std::string_view src_data,
+              std::string_view patch_data,
+              Blob* output);
+
+std::ostream& operator<<(std::ostream& out, const Lz4diffHeader&);
+
+template <typename T>
+std::ostream& operator<<(std::ostream& out,
+                         const google::protobuf::RepeatedPtrField<T>& arr) {
+  if (arr.empty()) {
+    out << "[]";
+    return out;
+  }
+  out << "[";
+  auto begin = arr.begin();
+  out << *begin;
+  ++begin;
+  for (; begin != arr.end(); ++begin) {
+    out << ", " << *begin;
+  }
+  out << "]";
+
+  return out;
+}
+
+}  // namespace chromeos_update_engine
+
+#endif