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_server/BUILD

@@ -0,0 +1,158 @@
+package(default_visibility = [
+    "//:__subpackages__",
+])
+
+cc_library(
+    name = "file_deleter_and_sender",
+    srcs = ["file_deleter_and_sender.cc"],
+    hdrs = ["file_deleter_and_sender.h"],
+    deps = [
+        "//cdc_rsync/base:message_pump",
+        "//cdc_rsync/protos:messages_cc_proto",
+        "//common:path",
+        "//common:status",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_test(
+    name = "file_deleter_and_sender_test",
+    srcs = ["file_deleter_and_sender_test.cc"],
+    deps = [
+        ":file_deleter_and_sender",
+        "//cdc_rsync/base:fake_socket",
+        "//common:status_test_macros",
+        "//common:test_main",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+cc_library(
+    name = "file_finder",
+    srcs = ["file_finder.cc"],
+    hdrs = ["file_finder.h"],
+    deps = [
+        ":file_info",
+        "//common:path",
+        "//common:path_filter",
+        "//common:status",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_test(
+    name = "file_finder_test",
+    srcs = ["file_finder_test.cc"],
+    data = ["testdata/root.txt"] + glob(["testdata/file_finder/**"]),
+    deps = [
+        ":file_finder",
+        "//common:status_test_macros",
+        "//common:test_main",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+cc_library(
+    name = "file_diff_generator",
+    srcs = ["file_diff_generator.cc"],
+    hdrs = ["file_diff_generator.h"],
+    deps = [
+        ":file_info",
+        "//cdc_rsync/protos:messages_cc_proto",
+        "//common:log",
+        "//common:path",
+        "//common:util",
+    ],
+)
+
+cc_test(
+    name = "file_diff_generator_test",
+    srcs = ["file_diff_generator_test.cc"],
+    data = ["testdata/root.txt"] + glob(["testdata/file_diff_generator/**"]),
+    deps = [
+        ":file_diff_generator",
+        "//common:status_test_macros",
+        "//common:test_main",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+cc_binary(
+    name = "cdc_rsync_server",
+    srcs = [
+        "cdc_rsync_server.cc",
+        "cdc_rsync_server.h",
+        "main.cc",
+    ],
+    copts = select({
+        #":debug_build": ["-fstandalone-debug"],
+        "//conditions:default": [],
+    }),
+    deps = [
+        ":file_deleter_and_sender",
+        ":file_diff_generator",
+        ":file_finder",
+        ":file_info",
+        ":server_socket",
+        ":unzstd_stream",
+        "//cdc_rsync/base:cdc_interface",
+        "//cdc_rsync/base:message_pump",
+        "//cdc_rsync/base:server_exit_code",
+        "//common:clock",
+        "//common:gamelet_component",
+        "//common:log",
+        "//common:path_filter",
+        "//common:status",
+        "//common:stopwatch",
+        "//common:threadpool",
+        "//common:util",
+    ],
+)
+
+config_setting(
+    name = "debug_build",
+    values = {
+        "compilation_mode": "dbg",
+    },
+)
+
+cc_library(
+    name = "file_info",
+    hdrs = ["file_info.h"],
+)
+
+cc_library(
+    name = "server_socket",
+    srcs = ["server_socket.cc"],
+    hdrs = ["server_socket.h"],
+    target_compatible_with = ["@platforms//os:linux"],
+    deps = [
+        "//cdc_rsync/base:socket",
+        "//common:log",
+        "//common:status",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_library(
+    name = "unzstd_stream",
+    srcs = ["unzstd_stream.cc"],
+    hdrs = ["unzstd_stream.h"],
+    deps = [
+        "//cdc_rsync/base:message_pump",
+        "//cdc_rsync/base:socket",
+        "//common:status",
+        "@com_github_zstd//:zstd",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+filegroup(
+    name = "all_test_sources",
+    srcs = glob(["*_test.cc"]),
+)
+
+filegroup(
+    name = "all_test_data",
+    srcs = glob(["testdata/**"]),
+)