126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
/*
|
|
* Copyright (C) 2015 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 <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <string>
|
|
|
|
#include "android-base/macros.h"
|
|
#include "android-base/off64_t.h"
|
|
#include "android-base/unique_fd.h"
|
|
|
|
#if !defined(_WIN32) && !defined(O_BINARY)
|
|
/** Windows needs O_BINARY, but Unix never mangles line endings. */
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
#if defined(_WIN32) && !defined(O_CLOEXEC)
|
|
/** Windows has O_CLOEXEC but calls it O_NOINHERIT for some reason. */
|
|
#define O_CLOEXEC O_NOINHERIT
|
|
#endif
|
|
|
|
class TemporaryFile {
|
|
public:
|
|
TemporaryFile();
|
|
explicit TemporaryFile(const std::string& tmp_dir);
|
|
~TemporaryFile();
|
|
|
|
// Release the ownership of fd, caller is reponsible for closing the
|
|
// fd or stream properly.
|
|
int release();
|
|
// Don't remove the temporary file in the destructor.
|
|
void DoNotRemove() { remove_file_ = false; }
|
|
|
|
int fd;
|
|
char path[1024];
|
|
|
|
private:
|
|
void init(const std::string& tmp_dir);
|
|
|
|
bool remove_file_ = true;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(TemporaryFile);
|
|
};
|
|
|
|
class TemporaryDir {
|
|
public:
|
|
TemporaryDir();
|
|
~TemporaryDir();
|
|
// Don't remove the temporary dir in the destructor.
|
|
void DoNotRemove() { remove_dir_and_contents_ = false; }
|
|
|
|
char path[1024];
|
|
|
|
private:
|
|
bool init(const std::string& tmp_dir);
|
|
|
|
bool remove_dir_and_contents_ = true;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(TemporaryDir);
|
|
};
|
|
|
|
namespace android {
|
|
namespace base {
|
|
|
|
bool ReadFdToString(borrowed_fd fd, std::string* content);
|
|
bool ReadFileToString(const std::string& path, std::string* content,
|
|
bool follow_symlinks = false);
|
|
|
|
bool WriteStringToFile(const std::string& content, const std::string& path,
|
|
bool follow_symlinks = false);
|
|
bool WriteStringToFd(const std::string& content, borrowed_fd fd);
|
|
|
|
#if !defined(_WIN32)
|
|
bool WriteStringToFile(const std::string& content, const std::string& path,
|
|
mode_t mode, uid_t owner, gid_t group,
|
|
bool follow_symlinks = false);
|
|
#endif
|
|
|
|
bool ReadFully(borrowed_fd fd, void* data, size_t byte_count);
|
|
|
|
// Reads `byte_count` bytes from the file descriptor at the specified offset.
|
|
// Returns false if there was an IO error or EOF was reached before reading `byte_count` bytes.
|
|
//
|
|
// NOTE: On Linux/Mac, this function wraps pread, which provides atomic read support without
|
|
// modifying the read pointer of the file descriptor. On Windows, however, the read pointer does
|
|
// get modified. This means that ReadFullyAtOffset can be used concurrently with other calls to the
|
|
// same function, but concurrently seeking or reading incrementally can lead to unexpected
|
|
// behavior.
|
|
bool ReadFullyAtOffset(borrowed_fd fd, void* data, size_t byte_count, off64_t offset);
|
|
|
|
bool WriteFully(borrowed_fd fd, const void* data, size_t byte_count);
|
|
|
|
bool RemoveFileIfExists(const std::string& path, std::string* err = nullptr);
|
|
|
|
#if !defined(_WIN32)
|
|
bool Realpath(const std::string& path, std::string* result);
|
|
bool Readlink(const std::string& path, std::string* result);
|
|
#endif
|
|
|
|
std::string GetExecutablePath();
|
|
std::string GetExecutableDirectory();
|
|
|
|
// Like the regular basename and dirname, but thread-safe on all
|
|
// platforms and capable of correctly handling exotic Windows paths.
|
|
std::string Basename(const std::string& path);
|
|
std::string Dirname(const std::string& path);
|
|
|
|
} // namespace base
|
|
} // namespace android
|