| // 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 TINK_PYTHON_CC_PYTHON_OUTPUT_STREAM_H_ |
| #define TINK_PYTHON_CC_PYTHON_OUTPUT_STREAM_H_ |
| |
| #include <memory> |
| |
| #include "tink/output_stream.h" |
| #include "tink/util/status.h" |
| #include "tink/util/statusor.h" |
| #include "tink/python/cc/python_file_object_adapter.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| // An OutputStream that writes to a PythonFileObjectAdapter. |
| class PythonOutputStream : public OutputStream { |
| public: |
| // Constructs an OutputStream that will write to the PythonFileObjectAdapter |
| // specified via 'adapter', using a buffer of the specified size, if any |
| // (if 'buffer_size' <= 0, a reasonable default will be used). |
| explicit PythonOutputStream(std::unique_ptr<PythonFileObjectAdapter> adapter, |
| int buffer_size = 0); |
| |
| ~PythonOutputStream() override; |
| |
| crypto::tink::util::StatusOr<int> Next(void** data) override; |
| |
| void BackUp(int count) override; |
| |
| crypto::tink::util::Status Close() override; |
| |
| int64_t Position() const override; |
| |
| private: |
| util::Status status_; |
| std::unique_ptr<PythonFileObjectAdapter> adapter_; |
| std::string buffer_; |
| bool is_first_call_; |
| int64_t position_; // current position in the underlying stream (from the |
| // beginning) |
| |
| // Counters that describe the state of the data in buffer_. |
| int count_in_buffer_; // # bytes in buffer_ that will be eventually written |
| int buffer_offset_; // offset where the returned *data starts in buffer_ |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_PYTHON_CC_PYTHON_OUTPUT_STREAM_H_ |