51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: BlobArbitraryReader.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::Buffered
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{
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class BlobArbitraryReader : public IArbitraryStreamer
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{
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public:
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AU_NO_COPY_NO_MOVE(BlobArbitraryReader)
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BlobArbitraryReader(const AuList<AuUInt8> &buffer) : buffer_(buffer) {}
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BlobArbitraryReader() {}
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~BlobArbitraryReader(){}
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virtual EStreamError Open() override
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{
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return EStreamError::eErrorNone;
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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 (buffer_.empty()) return EStreamError::eErrorEndOfStream;
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auto endOffset = offset + oldLen;
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auto realEndOffset = std::min(AuUInt32(buffer_.size()), endOffset);
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auto actualLength = realEndOffset - offset;
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if (actualLength < 0) return EStreamError::eErrorEndOfStream;
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len = actualLength;
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std::memcpy(buffer, buffer_.data() + offset, len);
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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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buffer_.clear();
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}
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private:
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AuList<AuUInt8> buffer_;
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};
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} |