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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.
90 lines
2.5 KiB
C++
90 lines
2.5 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 "cdc_rsync_server/unzstd_stream.h"
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#include "cdc_rsync/base/socket.h"
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#include "common/status.h"
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namespace cdc_ft {
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UnzstdStream::UnzstdStream(Socket* socket) : socket_(socket) {
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init_status_ =
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WrapStatus(Initialize(), "Failed to initialize stream decompressor");
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}
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UnzstdStream::~UnzstdStream() {
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if (dctx_) {
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ZSTD_freeDCtx(dctx_);
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dctx_ = nullptr;
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}
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}
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absl::Status UnzstdStream::Read(void* out_buffer, size_t out_size,
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size_t* bytes_read, bool* eof) {
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*bytes_read = 0;
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*eof = false;
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if (!init_status_.ok()) {
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return init_status_;
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}
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ZSTD_outBuffer output = {out_buffer, out_size, 0};
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while (output.pos < output.size && !*eof) {
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if (input_.pos == input_.size) {
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// Read more compressed input data.
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// Allow partial reads since the stream could end any time.
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size_t in_size;
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absl::Status status =
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socket_->Receive(in_buffer_.data(), in_buffer_.size(),
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/*allow_partial_read=*/true, &in_size);
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if (!status.ok()) {
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return WrapStatus(status, "socket_->ReceiveEx() failed");
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}
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input_.pos = 0;
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input_.size = in_size;
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}
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// Decompress.
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size_t ret = ZSTD_decompressStream(dctx_, &output, &input_);
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if (ZSTD_isError(ret)) {
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return MakeStatus("Failed to decompress data: %s",
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ZSTD_getErrorName(ret));
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}
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*eof = (ret == 0);
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if (*eof && input_.pos < input_.size) {
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return MakeStatus("EOF with %u bytes input data available",
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input_.size - input_.pos);
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}
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}
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// Output buffer is full or eof.
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*bytes_read = output.pos;
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return absl::OkStatus();
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}
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absl::Status UnzstdStream::Initialize() {
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dctx_ = ZSTD_createDCtx();
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if (!dctx_) {
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return MakeStatus("Decompression context creation failed");
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}
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in_buffer_.resize(ZSTD_DStreamInSize());
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input_ = {in_buffer_.data(), 0, 0};
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return absl::OkStatus();
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}
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} // namespace cdc_ft
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