140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "export/output/export_output_file.h"
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#include "export/output/export_output_result.h"
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#include "export/output/export_output_stats.h"
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#include "base/qt/qt_string_view.h"
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#include <QtCore/QFileInfo>
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#include <QtCore/QDir>
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#include <gsl/gsl_util>
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namespace Export {
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namespace Output {
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File::File(const QString &path, Stats *stats) : _path(path), _stats(stats) {
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}
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int64 File::size() const {
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return _offset;
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}
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bool File::empty() const {
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return !_offset;
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}
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Result File::writeBlock(const QByteArray &block) {
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const auto result = writeBlockAttempt(block);
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if (!result) {
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_file.reset();
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}
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return result;
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}
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Result File::writeBlockAttempt(const QByteArray &block) {
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if (_stats && !_inStats) {
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_inStats = true;
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_stats->incrementFiles();
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}
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if (const auto result = reopen(); !result) {
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return result;
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}
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const auto size = block.size();
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if (!size) {
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return Result::Success();
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}
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if (_file->write(block) == size && _file->flush()) {
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_offset += size;
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if (_stats) {
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_stats->incrementBytes(size);
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}
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return Result::Success();
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}
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return error();
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}
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Result File::reopen() {
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if (_file && _file->isOpen()) {
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return Result::Success();
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}
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_file.emplace(_path);
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if (_file->exists()) {
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if (_file->size() < _offset) {
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return fatalError();
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} else if (!_file->resize(_offset)) {
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return error();
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}
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} else if (_offset > 0) {
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return fatalError();
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}
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if (_file->open(QIODevice::Append)) {
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return Result::Success();
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}
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const auto info = QFileInfo(_path);
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const auto dir = info.absoluteDir();
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return (!dir.exists()
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&& dir.mkpath(dir.absolutePath())
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&& _file->open(QIODevice::Append))
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? Result::Success()
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: error();
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}
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Result File::error() const {
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return Result(Result::Type::Error, _path);
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}
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Result File::fatalError() const {
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return Result(Result::Type::FatalError, _path);
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}
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QString File::PrepareRelativePath(
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const QString &folder,
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const QString &suggested) {
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if (!QFile::exists(folder + suggested)) {
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return suggested;
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}
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// Not lastIndexOf('.') so that "file.tar.xz" won't be messed up.
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const auto position = suggested.indexOf('.');
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const auto base = suggested.mid(0, position);
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const auto extension = (position >= 0)
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? base::StringViewMid(suggested, position)
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: QStringView();
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const auto relativePart = [&](int attempt) {
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auto result = base + QString(" (%1)").arg(attempt);
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result.append(extension);
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return result;
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};
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auto attempt = 0;
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while (true) {
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const auto relativePath = relativePart(++attempt);
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if (!QFile::exists(folder + relativePath)) {
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return relativePath;
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}
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}
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}
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Result File::Copy(
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const QString &source,
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const QString &path,
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Stats *stats) {
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QFile f(source);
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if (!f.exists() || !f.open(QIODevice::ReadOnly)) {
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return Result(Result::Type::FatalError, source);
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}
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const auto bytes = f.readAll();
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if (bytes.size() != f.size()) {
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return Result(Result::Type::FatalError, source);
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}
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return File(path, stats).writeBlock(bytes);
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}
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} // namespace Output
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} // namespace File
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