jeanlemotan
48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#pragma once
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#include "fs/ISource.h"
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#include "tl/memory_buffer.h"
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namespace fs
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{
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/**
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* ISource interface implementation where the access to the underneath source
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* is done in buffered mode. This class must be used when there a lot of tiny
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* random access to the source. For further information please check ISource.
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*/
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template<typename SourceType>
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class BufferedSource final : public ISource
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{
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public:
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explicit BufferedSource(SourceType source, size_t bufferSize = 4096u);
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BufferedSource(BufferedSource&& other) = default;
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BufferedSource& operator=(BufferedSource&& other) = default;
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BufferedSource(const BufferedSource& other) = delete;
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BufferedSource& operator=(const BufferedSource& other) = delete;
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tl::optional<Error> getLastError() const override;
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size_t read(tl::span<uint8_t> data) override;
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void seekBeg(uint64_t offset) override;
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void seekRel(int64_t offset) override;
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uint64_t tell() const override;
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uint64_t getSize() const override;
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bool isEOS() const override;
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size_t getPreferredBufferSize() const override;
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private:
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SourceType m_source;
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uint64_t m_bufferStartOffset = 0;
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uint64_t m_bufferOffset = 0;
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bool m_endOfSource = false;
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tl::memory_buffer m_buffer;
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mutable tl::optional<Error> m_optLastError;
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};
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}
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