shared_buf.h

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/*
 * 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.
 */
#pragma once
 
#include <string>
#include <string_view>
#include <vector>
 
#include "cuttlefish/common/libs/fs/shared_fd.h"
 
namespace cuttlefish {
 
ssize_t ReadExact(SharedFD fd, std::string* buf);
 
ssize_t ReadExact(SharedFD fd, std::vector<char>* buf);
 
ssize_t ReadExact(SharedFD fd, char* buf, size_t size);
 
/*
 * Reads from fd until reading `sizeof(T)` bytes or errors.
 *
 * On a successful read, returns `sizeof(T)`.
 *
 * If a read error is encountered, returns -1. buf will contain any data read
 * up until that point and errno will be set.
 */
template <typename T>
ssize_t ReadExactBinary(SharedFD fd, T* binary_data) {
  return ReadExact(fd, (char*)binary_data, sizeof(*binary_data));
}
 
ssize_t WriteAll(SharedFD fd, std::string_view buf);
 
ssize_t WriteAll(SharedFD fd, const std::vector<char>& buf);
 
ssize_t WriteAll(SharedFD fd, const char* buf, size_t size);
 
template <typename T>
ssize_t WriteAllBinary(SharedFD fd, const T* binary_data) {
  return WriteAll(fd, (const char*)binary_data, sizeof(*binary_data));
}
 
bool SendAll(SharedFD sock, std::string_view msg);
 
}  // namespace cuttlefish