elexis
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
134 lines
3.1 KiB
C++
134 lines
3.1 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* output buffer and 'stream' layered on top of a compression codec
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*/
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#ifndef INCLUDED_STREAM
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#define INCLUDED_STREAM
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#include "lib/file/archive/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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Status Feed(const u8* in, size_t inSize);
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Status 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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// avoids the need for std::bind (not supported on all compilers) and boost::bind (can't be
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// used at work)
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struct StreamFeeder
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{
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NONCOPYABLE(StreamFeeder);
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public:
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StreamFeeder(Stream& stream)
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: stream(stream)
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{
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}
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Status operator()(const u8* data, size_t size) const
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{
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return stream.Feed(data, size);
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}
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private:
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Stream& stream;
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};
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#endif // #ifndef INCLUDED_STREAM
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