// Copyright 2020 The Pigweed 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

//

//     https://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 "pw_bytes/byte_builder.h"

namespace pw {

ByteBuilder& ByteBuilder::append(size_t count, std::byte b) {

  std::byte* const append_destination = buffer_.data() + size_;

  std::fill_n(append_destination, ResizeForAppend(count), b);

  return *this;

}

ByteBuilder& ByteBuilder::append(const void* bytes, size_t count) {

  std::byte* const append_destination = buffer_.data() + size_;

  std::copy_n(static_cast<const std::byte*>(bytes),

              ResizeForAppend(count),

              append_destination);

  return *this;

}

size_t ByteBuilder::ResizeForAppend(size_t bytes_to_append) {

  if (!status_.ok()) {

    return 0;

  }

  if (bytes_to_append > max_size() - size()) {

    status_ = Status::ResourceExhausted();

    return 0;

  }

  size_ += bytes_to_append;

  status_ = OkStatus();

  return bytes_to_append;

}

void ByteBuilder::resize(size_t new_size) {

  if (new_size <= size_) {

    size_ = new_size;

    status_ = OkStatus();

  } else {

    status_ = Status::OutOfRange();

  }

}

}  // namespace pw