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jakcron
66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/**
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* @file StreamSource.h
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* @brief Declaration of tc::io::StreamSource
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* @author Jack (jakcron)
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* @version 0.2
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* @date 2020/03/29
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**/
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#pragma once
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#include <tc/io/ISource.h>
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#include <tc/io/IStream.h>
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#include <tc/ArgumentNullException.h>
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#include <tc/NotSupportedException.h>
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namespace tc { namespace io {
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/**
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* @class StreamSource
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* @brief An IStream wrapped in an ISource.
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**/
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class StreamSource : public tc::io::ISource
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{
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public:
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/**
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* @brief Default constructor
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* @post This will create an unusable StreamSource, it will have to be assigned from a valid StreamSource object to be usable.
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**/
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StreamSource();
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/**
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* @brief Create StreamSource
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*
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* @param[in] stream The base IStream object which this sub source will derive from.
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*
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* @pre The base stream must support reading.
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*
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* @throw tc::ArgumentNullException @p stream is a @p nullptr.
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* @throw tc::NotSupportedException @p stream does not support reading.
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* @throw tc::NotSupportedException @p stream does not support seeking.
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**/
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StreamSource(const std::shared_ptr<tc::io::IStream>& stream);
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/**
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* @brief Gets the length of the source.
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**/
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int64_t length();
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/**
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* @brief Pull data from source
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*
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* @param[in] offset Zero-based offset in source to pull data.
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* @param[in] count The maximum number of bytes to be pull from the source.
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*
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* @return ByteData containing data pulled from source
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**/
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tc::ByteData pullData(int64_t offset, size_t count);
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private:
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static const std::string kClassName;
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std::shared_ptr<tc::io::IStream> mBaseStream;
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int64_t mBaseSourceOffset;
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int64_t mStreamSourceLength;
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};
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}} // namespace tc::io
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