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https://github.com/nestriness/cdc-file-transfer.git
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4326e972ac
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.
94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl_helper/jedec_size_flag.h"
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namespace cdc_ft {
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namespace {
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JedecUnit ToJedecUnit(char c) {
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switch (c) {
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case 'b':
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case 'B':
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return JedecUnit::Byte;
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case 'k':
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case 'K':
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return JedecUnit::Kilo;
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case 'm':
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case 'M':
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return JedecUnit::Mega;
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case 'g':
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case 'G':
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return JedecUnit::Giga;
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case 't':
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case 'T':
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return JedecUnit::Tera;
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case 'p':
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case 'P':
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return JedecUnit::Peta;
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default:
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return JedecUnit::Unkown;
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}
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}
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int LeftShiftAmount(JedecUnit unit) {
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switch (unit) {
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case JedecUnit::Kilo:
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return 10;
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case JedecUnit::Mega:
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return 20;
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case JedecUnit::Giga:
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return 30;
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case JedecUnit::Tera:
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return 40;
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case JedecUnit::Peta:
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return 50;
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default:
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return 0;
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}
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}
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} // namespace
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bool AbslParseFlag(absl::string_view text, JedecSize* flag, std::string* err) {
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if (text.empty()) return false;
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JedecUnit unit = ToJedecUnit(text.back());
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if (unit != JedecUnit::Unkown) {
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text.remove_suffix(1);
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} else {
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// Are we dealing with a digit character?
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if (text.back() >= '0' && text.back() <= '9') {
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unit = JedecUnit::Byte;
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} else {
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*err =
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"Supported size units are (B)yte, (K)ilo, (M)ega, (G)iga, (T)era, "
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"(P)eta.";
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return false;
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}
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}
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// Try to parse a plain uint64_t value.
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uint64_t size;
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if (!absl::ParseFlag(text, &size, err)) {
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return false;
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}
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flag->SetSize(size << LeftShiftAmount(unit));
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return true;
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}
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std::string AbslUnparseFlag(const JedecSize& size) {
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return absl::UnparseFlag(size.Size());
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}
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}; // namespace cdc_ft
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