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#include "cru/base/io/AutoReadStream.h"
#include "cru/base/io/Stream.h"
#include <thread>
namespace cru::io {
AutoReadStream::AutoReadStream(Stream* stream, bool auto_close,
bool auto_delete,
const AutoReadStreamOptions& options)
: Stream(false, true, stream->CanSeek()),
auto_close_(auto_close),
auto_delete_(auto_delete) {
auto buffer_stream_options = options.GetBufferStreamOptions();
stream_ = stream;
size_per_read_ = buffer_stream_options.GetBlockSizeOrDefault();
buffer_stream_ = std::make_unique<BufferStream>(buffer_stream_options);
background_thread_ = std::thread(&AutoReadStream::BackgroundThreadRun, this);
}
AutoReadStream::~AutoReadStream() {
DoClose();
background_thread_.join();
}
Index AutoReadStream::DoRead(std::byte* buffer, Index offset, Index size) {
return buffer_stream_->Read(buffer, offset, size);
}
Index AutoReadStream::DoWrite(const std::byte* buffer, Index offset,
Index size) {
return stream_->Write(buffer, offset, size);
}
void AutoReadStream::DoFlush() { stream_->Flush(); }
void AutoReadStream::DoClose() {
CRU_STREAM_BEGIN_CLOSE
if (auto_close_) {
stream_->Close();
}
if (auto_delete_) {
delete stream_;
stream_ = nullptr;
}
buffer_stream_->Close();
}
void AutoReadStream::BackgroundThreadRun() {
std::vector<std::byte> buffer(size_per_read_);
while (true) {
try {
auto read = stream_->Read(buffer.data(), buffer.size());
if (read == 0) {
buffer_stream_->SetEof();
break;
} else {
buffer_stream_->Write(buffer.data(), read);
}
} catch (const StreamClosedException& exception) {
buffer_stream_->Close();
break;
}
}
}
} // namespace cru::io
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