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126 lines
3.9 KiB
126 lines
3.9 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <string>
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#include "android-base/macros.h"
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#include "android-base/off64_t.h"
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#include "android-base/unique_fd.h"
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#if !defined(_WIN32) && !defined(O_BINARY)
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/** Windows needs O_BINARY, but Unix never mangles line endings. */
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#define O_BINARY 0
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#endif
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#if defined(_WIN32) && !defined(O_CLOEXEC)
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/** Windows has O_CLOEXEC but calls it O_NOINHERIT for some reason. */
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#define O_CLOEXEC O_NOINHERIT
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#endif
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class TemporaryFile {
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public:
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TemporaryFile();
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explicit TemporaryFile(const std::string& tmp_dir);
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~TemporaryFile();
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// Release the ownership of fd, caller is reponsible for closing the
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// fd or stream properly.
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int release();
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// Don't remove the temporary file in the destructor.
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void DoNotRemove() { remove_file_ = false; }
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int fd;
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char path[1024];
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private:
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void init(const std::string& tmp_dir);
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bool remove_file_ = true;
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DISALLOW_COPY_AND_ASSIGN(TemporaryFile);
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};
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class TemporaryDir {
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public:
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TemporaryDir();
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~TemporaryDir();
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// Don't remove the temporary dir in the destructor.
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void DoNotRemove() { remove_dir_and_contents_ = false; }
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char path[1024];
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private:
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bool init(const std::string& tmp_dir);
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bool remove_dir_and_contents_ = true;
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DISALLOW_COPY_AND_ASSIGN(TemporaryDir);
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};
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namespace android {
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namespace base {
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bool ReadFdToString(borrowed_fd fd, std::string* content);
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bool ReadFileToString(const std::string& path, std::string* content,
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bool follow_symlinks = false);
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bool WriteStringToFile(const std::string& content, const std::string& path,
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bool follow_symlinks = false);
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bool WriteStringToFd(const std::string& content, borrowed_fd fd);
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#if !defined(_WIN32)
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bool WriteStringToFile(const std::string& content, const std::string& path,
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mode_t mode, uid_t owner, gid_t group,
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bool follow_symlinks = false);
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#endif
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bool ReadFully(borrowed_fd fd, void* data, size_t byte_count);
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// Reads `byte_count` bytes from the file descriptor at the specified offset.
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// Returns false if there was an IO error or EOF was reached before reading `byte_count` bytes.
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//
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// NOTE: On Linux/Mac, this function wraps pread, which provides atomic read support without
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// modifying the read pointer of the file descriptor. On Windows, however, the read pointer does
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// get modified. This means that ReadFullyAtOffset can be used concurrently with other calls to the
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// same function, but concurrently seeking or reading incrementally can lead to unexpected
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// behavior.
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bool ReadFullyAtOffset(borrowed_fd fd, void* data, size_t byte_count, off64_t offset);
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bool WriteFully(borrowed_fd fd, const void* data, size_t byte_count);
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bool RemoveFileIfExists(const std::string& path, std::string* err = nullptr);
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#if !defined(_WIN32)
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bool Realpath(const std::string& path, std::string* result);
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bool Readlink(const std::string& path, std::string* result);
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#endif
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std::string GetExecutablePath();
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std::string GetExecutableDirectory();
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// Like the regular basename and dirname, but thread-safe on all
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// platforms and capable of correctly handling exotic Windows paths.
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std::string Basename(const std::string& path);
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std::string Dirname(const std::string& path);
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} // namespace base
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} // namespace android
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