100 lines
2.0 KiB
C++
100 lines
2.0 KiB
C++
/**
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* =========================================================================
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* File : stream.cpp
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* Project : 0 A.D.
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* Description :
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_STREAM
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#define INCLUDED_STREAM
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#include "codec.h"
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// note: this is similar in function to std::vector, but we don't need
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// iterators etc. and would prefer to avoid initializing each byte.
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class OutputBufferManager
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{
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public:
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OutputBufferManager();
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void Reset();
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void SetBuffer(u8* buffer, size_t size);
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/**
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* allocate a new output buffer.
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*
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* @param size [bytes] to allocate.
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*
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* notes:
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* - if a buffer had previously been allocated and is large enough,
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* it is reused (this reduces the number of allocations).
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* - this class manages the lifetime of the buffer.
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**/
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void AllocateBuffer(size_t size);
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u8* Buffer() const
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{
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return m_buffer;
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}
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size_t Size() const
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{
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return m_size;
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}
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private:
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bool IsAllowableBuffer(u8* buffer, size_t size);
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u8* m_buffer;
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size_t m_size;
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shared_ptr<u8> m_mem;
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// size of m_mem. allows reusing previously allocated buffers
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// (user-specified buffers can't be reused because we have no control
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// over their lifetime)
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size_t m_capacity;
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};
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class Stream
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{
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public:
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Stream(const PICodec& codec);
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void SetOutputBuffer(u8* out, size_t outSize);
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void AllocateOutputBuffer(size_t outSizeMax);
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/**
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* 'feed' the codec with a data block.
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**/
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LibError Feed(const u8* in, size_t inSize);
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LibError Finish();
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size_t OutSize() const
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{
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return m_outProduced;
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}
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u32 Checksum() const
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{
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return m_checksum;
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}
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private:
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PICodec m_codec;
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OutputBufferManager m_outputBufferManager;
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size_t m_inConsumed;
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size_t m_outProduced;
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u32 m_checksum;
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};
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extern LibError FeedStream(uintptr_t cbData, const u8* in, size_t inSize);
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#endif // #ifndef INCLUDED_STREAM
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