128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/system/file_wrapper.h"
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#include "rtc_base/numerics/safe_conversions.h"
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#include <cerrno>
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#ifdef _WIN32
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#include <Windows.h>
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#else
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#include <string.h>
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#endif
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#include <utility>
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namespace webrtc {
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namespace {
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FILE* FileOpen(const char* file_name_utf8, bool read_only, int* error) {
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#if defined(_WIN32)
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int len = MultiByteToWideChar(CP_UTF8, 0, file_name_utf8, -1, nullptr, 0);
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std::wstring wstr(len, 0);
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MultiByteToWideChar(CP_UTF8, 0, file_name_utf8, -1, &wstr[0], len);
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FILE* file = _wfopen(wstr.c_str(), read_only ? L"rb" : L"wb");
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#else
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FILE* file = fopen(file_name_utf8, read_only ? "rb" : "wb");
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#endif
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if (!file && error) {
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*error = errno;
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}
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return file;
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}
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const char* GetCstrCheckNoEmbeddedNul(const std::string& s) {
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const char* p = s.c_str();
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RTC_CHECK_EQ(strlen(p), s.size())
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<< "Invalid filename, containing NUL character";
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return p;
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}
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} // namespace
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// static
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FileWrapper FileWrapper::OpenReadOnly(const char* file_name_utf8) {
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return FileWrapper(FileOpen(file_name_utf8, true, nullptr));
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}
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// static
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FileWrapper FileWrapper::OpenReadOnly(const std::string& file_name_utf8) {
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return OpenReadOnly(GetCstrCheckNoEmbeddedNul(file_name_utf8));
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}
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// static
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FileWrapper FileWrapper::OpenWriteOnly(const char* file_name_utf8,
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int* error /*=nullptr*/) {
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return FileWrapper(FileOpen(file_name_utf8, false, error));
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}
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// static
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FileWrapper FileWrapper::OpenWriteOnly(const std::string& file_name_utf8,
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int* error /*=nullptr*/) {
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return OpenWriteOnly(GetCstrCheckNoEmbeddedNul(file_name_utf8), error);
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}
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FileWrapper::FileWrapper(FileWrapper&& other) {
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operator=(std::move(other));
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}
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FileWrapper& FileWrapper::operator=(FileWrapper&& other) {
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Close();
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file_ = other.file_;
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other.file_ = nullptr;
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return *this;
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}
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bool FileWrapper::SeekRelative(int64_t offset) {
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RTC_DCHECK(file_);
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return fseek(file_, rtc::checked_cast<long>(offset), SEEK_CUR) == 0;
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}
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bool FileWrapper::SeekTo(int64_t position) {
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RTC_DCHECK(file_);
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return fseek(file_, rtc::checked_cast<long>(position), SEEK_SET) == 0;
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}
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bool FileWrapper::Flush() {
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RTC_DCHECK(file_);
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return fflush(file_) == 0;
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}
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size_t FileWrapper::Read(void* buf, size_t length) {
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RTC_DCHECK(file_);
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return fread(buf, 1, length, file_);
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}
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bool FileWrapper::ReadEof() const {
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RTC_DCHECK(file_);
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return feof(file_);
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}
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bool FileWrapper::Write(const void* buf, size_t length) {
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RTC_DCHECK(file_);
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return fwrite(buf, 1, length, file_) == length;
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}
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bool FileWrapper::Close() {
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if (file_ == nullptr)
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return true;
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bool success = fclose(file_) == 0;
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file_ = nullptr;
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return success;
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}
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FILE* FileWrapper::Release() {
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FILE* file = file_;
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file_ = nullptr;
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return file;
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}
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} // namespace webrtc
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