libprofile/profile/profile_helpers.h

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * 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 ART_LIBPROFILE_PROFILE_PROFILE_HELPERS_H_
#define ART_LIBPROFILE_PROFILE_PROFILE_HELPERS_H_

#include <unistd.h>

#include <vector>

#include "base/globals.h"

namespace art {

// Returns true if all the bytes were successfully written to the file descriptor.
inline bool WriteBuffer(int fd, const uint8_t* buffer, size_t byte_count) {
  while (byte_count > 0) {
    int bytes_written = TEMP_FAILURE_RETRY(write(fd, buffer, byte_count));
    if (bytes_written == -1) {
      return false;
    }
    byte_count -= bytes_written;  // Reduce the number of remaining bytes.
    buffer += bytes_written;  // Move the buffer forward.
  }
  return true;
}

// Add the string bytes to the buffer.
inline void AddStringToBuffer(std::vector<uint8_t>* buffer, const std::string& value) {
  buffer->insert(buffer->end(), value.begin(), value.end());
}

// Insert each byte, from low to high into the buffer.
template <typename T>
inline void AddUintToBuffer(std::vector<uint8_t>* buffer, T value) {
  for (size_t i = 0; i < sizeof(T); i++) {
    buffer->push_back((value >> (i * kBitsPerByte)) & 0xff);
  }
}

}  // namespace art

#endif  // ART_LIBPROFILE_PROFILE_PROFILE_HELPERS_H_