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// 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_BASE94_OUTPUT_STREAM_H_
#define CRASHPAD_UTIL_STREAM_BASE94_OUTPUT_STREAM_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/macros.h"
#include "util/stream/output_stream_interface.h"
namespace crashpad {
//! \brief This class implements Base94 encoding/decoding, it uses all
//! printable characters except space for encoding, and no padding is required.
//!
//! This implementation uses two base94 symbols to encoding 13 or 14 bit data,
//! To maximize encoding efficiency, 14-bit data is encoded into two base94
//! symbols if its low 13-bit is less than 644 ( = 94^2 - 2^13), otherwise
//! 13-bit data is encoded.
class Base94OutputStream : public OutputStreamInterface {
public:
//! \brief Whether this object is configured to encode or decode data.
enum class Mode : bool {
//! \brief Data passed through this object is encoded.
kEncode = false,
//! \brief Data passed through this object is decoded.
kDecode = true
};
//! \param[in] mode The work mode of this object.
//! \param[in] output_stream The output_stream that this object writes to.
Base94OutputStream(Mode mode,
std::unique_ptr<OutputStreamInterface> output_stream);
~Base94OutputStream() override;
// OutputStreamInterface:
bool Write(const uint8_t* data, size_t size) override;
bool Flush() override;
private:
bool Encode(const uint8_t* data, size_t size);
bool Decode(const uint8_t* data, size_t size);
bool FinishEncoding();
bool FinishDecoding();
// Write encoded/decoded data to |output_stream_| and empty the |buffer_|.
bool WriteOutputStream();
Mode mode_;
std::unique_ptr<OutputStreamInterface> output_stream_;
std::vector<uint8_t> buffer_;
uint32_t bit_buf_;
// The number of valid bit in bit_buf_.
size_t bit_count_;
char symbol_buffer_;
bool flush_needed_;
bool flushed_;
DISALLOW_COPY_AND_ASSIGN(Base94OutputStream);
};
} // namespace crashpad
#endif // CRASHPAD_UTIL_STREAM_BASE94_OUTPUT_STREAM_H_