104 lines
2.4 KiB
C++
104 lines
2.4 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 "media/streaming/media_streaming_loader_local.h"
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#include "storage/cache/storage_cache_types.h"
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namespace Media {
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namespace Streaming {
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namespace {
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// This is the maximum file size in Telegram API.
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constexpr auto kMaxFileSize = 3000 * 512 * 1024;
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int ValidateLocalSize(int64 size) {
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return (size > 0 && size <= kMaxFileSize) ? int(size) : 0;
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}
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} // namespace
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LoaderLocal::LoaderLocal(std::unique_ptr<QIODevice> device)
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: _device(std::move(device))
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, _size(ValidateLocalSize(_device->size())) {
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Expects(_device != nullptr);
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if (!_size || !_device->open(QIODevice::ReadOnly)) {
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fail();
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}
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}
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std::optional<Storage::Cache::Key> LoaderLocal::baseCacheKey() const {
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return std::nullopt;
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}
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int LoaderLocal::size() const {
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return _size;
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}
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void LoaderLocal::load(int offset) {
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if (_device->pos() != offset && !_device->seek(offset)) {
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fail();
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return;
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}
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auto result = _device->read(kPartSize);
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if (result.isEmpty()
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|| ((result.size() != kPartSize)
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&& (offset + result.size() != size()))) {
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fail();
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return;
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}
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crl::on_main(this, [=, result = std::move(result)]() mutable {
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_parts.fire({ offset, std::move(result) });
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});
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}
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void LoaderLocal::fail() {
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crl::on_main(this, [=] {
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_parts.fire({ LoadedPart::kFailedOffset });
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});
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}
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void LoaderLocal::cancel(int offset) {
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}
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void LoaderLocal::increasePriority() {
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}
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void LoaderLocal::stop() {
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}
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rpl::producer<LoadedPart> LoaderLocal::parts() const {
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return _parts.events();
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}
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void LoaderLocal::attachDownloader(
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Storage::StreamedFileDownloader *downloader) {
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Unexpected("Downloader attached to a local streaming loader.");
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}
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void LoaderLocal::clearAttachedDownloader() {
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Unexpected("Downloader detached from a local streaming loader.");
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}
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std::unique_ptr<LoaderLocal> MakeFileLoader(const QString &path) {
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return std::make_unique<LoaderLocal>(std::make_unique<QFile>(path));
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}
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std::unique_ptr<LoaderLocal> MakeBytesLoader(const QByteArray &bytes) {
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auto device = std::make_unique<QBuffer>();
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auto copy = new QByteArray(bytes);
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QObject::connect(device.get(), &QBuffer::destroyed, [=] {
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delete copy;
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});
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device->setBuffer(copy);
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return std::make_unique<LoaderLocal>(std::move(device));
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}
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} // namespace Streaming
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} // namespace Media
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