| // Copyright 2019 The Crashpad Authors. All rights reserved. |
| // |
| // 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 CRASHPAD_UTIL_STREAM_ZLIB_OUTPUT_STREAM_H_ |
| #define CRASHPAD_UTIL_STREAM_ZLIB_OUTPUT_STREAM_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "third_party/zlib/zlib_crashpad.h" |
| #include "util/misc/initialization_state.h" |
| #include "util/stream/output_stream_interface.h" |
| |
| namespace crashpad { |
| |
| //! \brief The class wraps zlib into \a OutputStreamInterface. |
| class ZlibOutputStream : public OutputStreamInterface { |
| public: |
| //! \brief Whether this object is configured to compress or decompress data. |
| enum class Mode : bool { |
| //! \brief Data passed through this object is compressed. |
| kCompress = false, |
| //! \brief Data passed through this object is decompressed. |
| kDecompress = true |
| }; |
| |
| //! \param[in] mode The work mode of this object. |
| //! \param[in] output_stream The output_stream that this object writes to. |
| //! |
| //! To construct an output pipeline, the output stream needs an output stream |
| //! to write the result to. For example, the code below constructs a |
| //! compress->base94-encoding->log output stream pipline. |
| //! |
| //! <code> |
| //! ZlibOutputStream zlib_output_stream( |
| //! ZlibOutputStream::Mode::kDeflate, |
| //! std::make_unique<Base94OutputStream>( |
| //! Base94OutputStream::Mode::kEncode, |
| //! std::make_unique<LogOutputStream>())); |
| //! </code> |
| //! |
| //! |
| ZlibOutputStream(Mode mode, |
| std::unique_ptr<OutputStreamInterface> output_stream); |
| ~ZlibOutputStream() override; |
| |
| // OutputStreamInterface: |
| bool Write(const uint8_t* data, size_t size) override; |
| bool Flush() override; |
| |
| private: |
| // Write compressed/decompressed data to |output_stream_| and empty the output |
| // buffer in |zlib_stream_|. |
| bool WriteOutputStream(); |
| |
| uint8_t buffer_[4096]; |
| z_stream zlib_stream_; |
| std::unique_ptr<OutputStreamInterface> output_stream_; |
| Mode mode_; |
| InitializationState initialized_; // protects zlib_stream_ |
| bool flush_needed_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ZlibOutputStream); |
| }; |
| |
| } // namespace crashpad |
| |
| #endif // CRASHPAD_UTIL_STREAM_ZLIB_OUTPUT_STREAM_H_ |