50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
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/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: FileArbitraryReader.hpp
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Date: 2021-6-10
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Author: Reece
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***/
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#pragma once
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namespace Aurora::IO::FS
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{
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class FileArbitraryReader : public IArbitraryStreamer
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{
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public:
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AU_NO_COPY_NO_MOVE(FileArbitraryReader)
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FileArbitraryReader() {}
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~FileArbitraryReader() {}
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template<typename... T>
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bool OpenFile(T... args)
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{
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stream_ = OpenReadUnique(args...);
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return stream_ != nullptr;
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}
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virtual EStreamError Open() override
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{
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return stream_ ? EStreamError::eErrorNone : EStreamError::eErrorStreamInterrupted;
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}
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virtual EStreamError ArbitraryRead(AuUInt32 offset, void *buffer, AuUInt32 &len) override
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{
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auto oldLen = std::exchange(len, 0);
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if (!stream_) return EStreamError::eErrorStreamNotOpen;
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stream_->SetOffset(offset);
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len = stream_->Read(buffer, oldLen);
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if (len == 0) return EStreamError::eErrorEndOfStream;
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return EStreamError::eErrorNone;
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}
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virtual void Close() override
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{
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stream_.reset();
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}
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private:
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OpenReadUnique_t stream_{};
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};
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}
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