Releasing the former Stadia file transfer tools

The tools allow efficient and fast synchronization of large directory
trees from a Windows workstation to a Linux target machine.

cdc_rsync* support efficient copy of files by using content-defined
chunking (CDC) to identify chunks within files that can be reused.

asset_stream_manager + cdc_fuse_fs support efficient streaming of a
local directory to a remote virtual file system based on FUSE. It also
employs CDC to identify and reuse unchanged data chunks.

cdc_rsync_cli/main.cc

@@ -0,0 +1,72 @@
+// Copyright 2022 Google LLC
+//
+// 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.
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include <string>
+#include <vector>
+
+#include "cdc_rsync/cdc_rsync.h"
+#include "cdc_rsync_cli/params.h"
+#include "common/util.h"
+
+int wmain(int argc, wchar_t* argv[]) {
+  cdc_ft::params::Parameters parameters;
+
+  // Convert args from wide to UTF8 strings.
+  std::vector<std::string> utf8_str_args;
+  utf8_str_args.reserve(argc);
+  for (int i = 0; i < argc; i++) {
+    utf8_str_args.push_back(cdc_ft::Util::WideToUtf8Str(argv[i]));
+  }
+
+  // Convert args from UTF8 strings to UTF8 c-strings.
+  std::vector<const char*> utf8_args;
+  utf8_args.reserve(argc);
+  for (const auto& utf8_str_arg : utf8_str_args) {
+    utf8_args.push_back(utf8_str_arg.c_str());
+  }
+
+  if (!cdc_ft::params::Parse(argc, utf8_args.data(), &parameters)) {
+    return 1;
+  }
+
+  // Convert sources from string-vec to c-str-vec.
+  std::vector<const char*> sources_ptr;
+  sources_ptr.reserve(parameters.sources.size());
+  for (const std::string& source : parameters.sources) {
+    sources_ptr.push_back(source.c_str());
+  }
+
+  // Convert filter rules from string-structs to c-str-structs.
+  std::vector<cdc_ft::FilterRule> filter_rules;
+  filter_rules.reserve(parameters.filter_rules.size());
+  for (const cdc_ft::params::Parameters::FilterRule& rule :
+       parameters.filter_rules) {
+    filter_rules.emplace_back(rule.type, rule.pattern.c_str());
+  }
+
+  const char* error_message = nullptr;
+  cdc_ft::ReturnCode code = cdc_ft::Sync(
+      &parameters.options, filter_rules.data(), parameters.filter_rules.size(),
+      parameters.sources_dir.c_str(), sources_ptr.data(),
+      parameters.sources.size(), parameters.destination.c_str(),
+      &error_message);
+
+  if (error_message) {
+    fprintf(stderr, "Error: %s\n", error_message);
+  }
+  return static_cast<int>(code);
+}