chromium/third_party/crashpad/crashpad/util/stream/base94_output_stream.cc

// Copyright 2019 The Crashpad Authors
//
// 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.

#include "util/stream/base94_output_stream.h"

#include <algorithm>

#include "base/check.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"

namespace crashpad {

namespace {
// To improve the space efficiency, we can encode 14 bits into two symbols
// if 14-bit number is less than 94^2 which is total number can be encoded
// by 2 digits of base94 number, in another word, if 13 bit number is
// smaller than 643, we could read one more bit, because even if the 14th
// bit is 1, the 14-bit number doesn’t exceed the max value.
constexpr uint16_t kMaxValueOf14BitEncoding = …;

constexpr size_t kMaxBuffer = …;

inline uint8_t EncodeByte(uint8_t byte) { … }

inline uint8_t DecodeByte(uint8_t byte) { … }

}  // namespace

Base94OutputStream::Base94OutputStream(
    Mode mode,
    std::unique_ptr<OutputStreamInterface> output_stream)
    : … { … }

Base94OutputStream::~Base94OutputStream() { … }

bool Base94OutputStream::Write(const uint8_t* data, size_t size) { … }

bool Base94OutputStream::Flush() { … }

bool Base94OutputStream::Encode(const uint8_t* data, size_t size) { … }

bool Base94OutputStream::Decode(const uint8_t* data, size_t size) { … }

bool Base94OutputStream::FinishEncoding() { … }

bool Base94OutputStream::FinishDecoding() { … }

bool Base94OutputStream::WriteOutputStream() { … }

}  // namespace crashpad