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.

absl_helper/jedec_size_flag.h

@@ -0,0 +1,61 @@
+/*
+ * 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.
+ */
+
+#ifndef ABSL_HELPER_JEDEC_SIZE_FLAG_H_
+#define ABSL_HELPER_JEDEC_SIZE_FLAG_H_
+
+#include <string>
+
+#include "absl/flags/flag.h"
+#include "absl/flags/marshalling.h"
+#include "absl/strings/string_view.h"
+
+namespace cdc_ft {
+
+// Supported JEDEC unit suffixes.
+enum class JedecUnit : char {
+  Unkown = 0,
+  Byte = 'B',  // optional
+  Kilo = 'K',
+  Mega = 'M',
+  Giga = 'G',
+  Tera = 'T',
+  Peta = 'P',
+};
+
+// This class parses flag arguments that represent human readable data sizes,
+// such as 1024, 2K, 3M, 4G, or 5T.
+//
+// See https://en.wikipedia.org/wiki/JEDEC_memory_standards.
+class JedecSize {
+ public:
+  explicit JedecSize(uint64_t size = 0) : size_(size) {}
+  uint64_t Size() const { return size_; }
+  void SetSize(uint64_t size) { size_ = size; }
+
+ private:
+  uint64_t size_;
+};
+
+// Abseil flags parser for JedecSize.
+bool AbslParseFlag(absl::string_view text, JedecSize* flag, std::string* err);
+
+// Abseil flags unparser for JedecSize.
+std::string AbslUnparseFlag(const JedecSize& size);
+
+};  // namespace cdc_ft
+
+#endif  // ABSL_HELPER_JEDEC_SIZE_FLAG_H_