Class FileExtractSink

switch/source/transfer.cpp:222–252

ExtractSink writing under a destination root via FILE*.

    // ExtractSink writing under a destination root via FILE*.
    struct FileExtractSink : TransferProto::ExtractSink {
        std::string destRoot;
        FILE* output = nullptr;
        explicit FileExtractSink(std::string root) : destRoot(std::move(root)) {}
        bool makeDir(const std::string& relPath) override
        {
            std::string dirPath = destRoot + relPath;
            if (!io::directoryExists(dirPath)) {
                io::createDirectory(dirPath);
            }
            return true;
        }
        bool beginFile(const std::string& relPath, uint32_t) override
        {
            ensureDirectoryPath(destRoot, relPath);
            output = fopen((destRoot + relPath).c_str(), "wb");
            return output != nullptr;
        }
        bool writeFile(const void* data, size_t n) override
        {
            fwrite(data, 1, n, output);
            return true;
        }
        void endFile() override
        {
            if (output != nullptr) {
                fclose(output);
                output = nullptr;
            }
        }
    };

    // FileReader opening backup files via FILE* for the send.
    struct StdFileReader : TransferProto::FileReader {