crashpad/util/stream/base94_output_stream.h
Peter Boström 1aa478d161 Remove DISALLOW_* macros in crashpad
This change was partially scripted and partially done manually with vim
regex + manually placing the deleted constructors.

The script change looked for destructors in the public: section of a
class, if that existed the deleted constructors would go before the
destructor.

For manual placement I looked for any constructor in the public: section
of the corresponding class. If there wasn't one, then it would ideally
have gone as the first entry except below enums, classes and typedefs.
This may not have been perfect, but is hopefully good enough. Fingers
crossed.

#include "base/macros.h" is removed from files that don't use
ignore_result, which is the only other thing defined in base/macros.h.

Bug: chromium:1010217
Change-Id: I099526255a40b1ac1264904b4ece2f3f503c9418
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3171034
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
2021-09-21 15:09:44 +00:00

81 lines
2.7 KiB
C++

// 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 "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(const Base94OutputStream&) = delete;
Base94OutputStream& operator=(const Base94OutputStream&) = delete;
~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_;
};
} // namespace crashpad
#endif // CRASHPAD_UTIL_STREAM_BASE94_OUTPUT_STREAM_H_