70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
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// mem_buf.h
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//
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/*
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The MIT License (MIT)
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Copyright (c) 2012-2019 HouSisong
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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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
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __mem_buf_h
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#define __mem_buf_h
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#include <stdlib.h> //malloc free
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#include <string.h> //size_t
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#include <stdexcept> //std::runtime_error
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#include <string>
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namespace hdiff_private{
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struct TAutoMem{
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inline explicit TAutoMem(size_t size=0) :_data(0),_data_end(0){ realloc(size); }
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inline ~TAutoMem(){ clear(); }
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inline unsigned char* data(){ return _data; }
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inline const unsigned char* data()const{ return _data; }
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inline unsigned char* data_end(){ return _data_end; }
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inline const unsigned char* data_end()const{ return _data_end; }
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inline size_t size()const{ return (size_t)(_data_end-_data); }
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inline bool empty()const{ return (_data_end==_data); }
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inline void clear(){ if (_data) { free(_data); _data=0; _data_end=0; } }
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inline void realloc(size_t newSize){
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if (newSize!=size()){
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clear();
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if (newSize>0){
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_data=(unsigned char*)malloc(newSize);
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if (0==_data) throw std::runtime_error("TAutoMem::TAutoMem() malloc() error!");
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_data_end=_data+newSize;
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}
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}
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}
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inline void reduceSize(size_t reserveSize){
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if (reserveSize<=size())
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_data_end=_data+reserveSize;
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else
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throw std::runtime_error("TAutoMem::reduceSize() error!");
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}
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private:
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unsigned char* _data;
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unsigned char* _data_end;
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};
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}//namespace hdiff_private
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#endif //__mem_buf_h
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