146 lines
3.9 KiB
C++
146 lines
3.9 KiB
C++
// Copyright 2014 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include <packager/file/local_file.h>
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#if defined(OS_WIN)
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#include <windows.h>
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#else
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#include <sys/stat.h>
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#endif // defined(OS_WIN)
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#include <cstdio>
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#include <filesystem>
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#include <absl/log/check.h>
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#include <absl/log/log.h>
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#include <packager/macros.h>
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namespace shaka {
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// Always open files in binary mode.
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const char kAdditionalFileMode[] = "b";
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LocalFile::LocalFile(const char* file_name, const char* mode)
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: File(file_name), file_mode_(mode), internal_file_(NULL) {
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if (file_mode_.find(kAdditionalFileMode) == std::string::npos)
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file_mode_ += kAdditionalFileMode;
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}
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bool LocalFile::Close() {
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bool result = true;
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if (internal_file_) {
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result = fclose(internal_file_) == 0;
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internal_file_ = NULL;
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}
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delete this;
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return result;
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}
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int64_t LocalFile::Read(void* buffer, uint64_t length) {
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DCHECK(buffer != NULL);
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DCHECK(internal_file_ != NULL);
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size_t bytes_read = fread(buffer, sizeof(char), length, internal_file_);
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VLOG(2) << "Read " << length << " return " << bytes_read << " error "
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<< ferror(internal_file_);
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if (bytes_read == 0 && ferror(internal_file_) != 0) {
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return -1;
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}
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return bytes_read;
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}
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int64_t LocalFile::Write(const void* buffer, uint64_t length) {
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DCHECK(buffer != NULL);
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DCHECK(internal_file_ != NULL);
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size_t bytes_written = fwrite(buffer, sizeof(char), length, internal_file_);
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VLOG(2) << "Write " << length << " return " << bytes_written << " error "
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<< ferror(internal_file_);
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if (bytes_written == 0 && ferror(internal_file_) != 0) {
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return -1;
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}
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return bytes_written;
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}
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void LocalFile::CloseForWriting() {}
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int64_t LocalFile::Size() {
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DCHECK(internal_file_ != NULL);
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// Flush any buffered data, so we get the true file size.
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if (!Flush()) {
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LOG(ERROR) << "Cannot flush file.";
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return -1;
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}
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std::error_code ec;
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auto file_path = std::filesystem::u8path(file_name());
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int64_t file_size = std::filesystem::file_size(file_path, ec);
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if (ec) {
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LOG(ERROR) << "Cannot get file size, error: " << ec;
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return -1;
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}
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return file_size;
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}
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bool LocalFile::Flush() {
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DCHECK(internal_file_ != NULL);
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return ((fflush(internal_file_) == 0) && !ferror(internal_file_));
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}
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bool LocalFile::Seek(uint64_t position) {
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#if defined(OS_WIN)
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return _fseeki64(internal_file_, static_cast<__int64>(position), SEEK_SET) ==
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0;
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#else
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return fseeko(internal_file_, position, SEEK_SET) >= 0;
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#endif // !defined(OS_WIN)
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}
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bool LocalFile::Tell(uint64_t* position) {
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#if defined(OS_WIN)
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__int64 offset = _ftelli64(internal_file_);
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#else
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off_t offset = ftello(internal_file_);
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#endif // !defined(OS_WIN)
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if (offset < 0)
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return false;
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*position = static_cast<uint64_t>(offset);
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return true;
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}
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LocalFile::~LocalFile() {}
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bool LocalFile::Open() {
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auto file_path = std::filesystem::u8path(file_name());
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// Create upper level directories for write mode.
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if (file_mode_.find("w") != std::string::npos) {
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// From the return value of filesystem::create_directories, you can't tell
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// the difference between pre-existing directories and failure. So check
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// first if it needs to be created.
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auto parent_path = file_path.parent_path();
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std::error_code ec;
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if (parent_path != "" && !std::filesystem::is_directory(parent_path, ec)) {
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if (!std::filesystem::create_directories(parent_path, ec)) {
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return false;
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}
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}
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}
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internal_file_ = fopen(file_path.u8string().c_str(), file_mode_.c_str());
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return (internal_file_ != NULL);
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}
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bool LocalFile::Delete(const char* file_name) {
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auto file_path = std::filesystem::u8path(file_name);
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std::error_code ec;
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// On error (ec truthy), remove() will return false anyway.
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return std::filesystem::remove(file_path, ec);
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}
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} // namespace shaka
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