80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
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/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: ViewReader.hpp
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Date: 2022-12-11
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Author: Reece
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***/
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#pragma once
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namespace Aurora::IO::Buffered
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{
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struct ViewReader : IStreamReader
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{
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AU_NO_COPY(ViewReader)
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inline ViewReader(const AuSPtr<Memory::MemoryViewRead> &view) : pView_(view)
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{ }
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inline ViewReader()
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{ }
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inline ~ViewReader()
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{ }
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inline virtual EStreamError IsOpen() override
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{
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if (!this->pView_)
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{
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return EStreamError::eErrorStreamNotOpen;
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}
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if (!(*this->pView_.get()))
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{
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return EStreamError::eErrorStreamNotOpen;
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}
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return EStreamError::eErrorNone;
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}
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inline virtual EStreamError Read(const Memory::MemoryViewStreamWrite ¶meters) override
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{
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parameters.outVariable = 0;
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if (!this->pView_)
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{
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return EStreamError::eErrorStreamNotOpen;
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}
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if (!(*this->pView_.get()))
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{
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this->pView_.reset();
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return this->uOffset_ ? EStreamError::eErrorStreamNotOpen : EStreamError::eErrorNone;
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}
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auto uToRead = AuMin(this->pView_->length - this->uOffset_, parameters.length);
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parameters.outVariable = uToRead;
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AuMemcpy(parameters.ptr, this->pView_->Begin<AuUInt8>() + this->uOffset_, uToRead);
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this->uOffset_ += uToRead;
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return parameters.outVariable == 0 ? EStreamError::eErrorEndOfStream : EStreamError::eErrorNone;
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}
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inline virtual void Close() override
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{
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this->pView_.reset();
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}
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inline AuUInt &GetOffset()
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{
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return this->uOffset_;
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}
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inline const AuUInt &GetOffset() const
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{
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return this->uOffset_;
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}
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private:
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AuSPtr<Memory::MemoryViewRead> pView_;
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AuUInt uOffset_ {};
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};
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}
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