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74 lines
1.2 KiB
C++
74 lines
1.2 KiB
C++
/*
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* CMemoryBuffer.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "CMemoryBuffer.h"
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///CMemoryBuffer
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CMemoryBuffer::CMemoryBuffer():
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position(0)
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{
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buffer.reserve(4096);
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}
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si64 CMemoryBuffer::write(const ui8 * data, si64 size)
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{
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//do not shrink
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const si64 newSize = tell()+size;
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if(newSize>getSize())
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buffer.resize(newSize);
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std::copy(data, data + size, buffer.data() + position);
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position += size;
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return size;
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}
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si64 CMemoryBuffer::read(ui8 * data, si64 size)
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{
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si64 toRead = std::min(getSize() - tell(), size);
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if(toRead > 0)
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{
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std::copy(buffer.data() + position, buffer.data() + position + toRead, data);
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position += toRead;
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}
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return toRead;
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}
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si64 CMemoryBuffer::seek(si64 position)
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{
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this->position = position;
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if (this->position >getSize())
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this->position = getSize();
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return this->position;
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}
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si64 CMemoryBuffer::tell()
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{
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return position;
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}
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si64 CMemoryBuffer::skip(si64 delta)
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{
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auto old_position = tell();
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return seek(old_position + delta) - old_position;
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}
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si64 CMemoryBuffer::getSize()
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{
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return buffer.size();
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}
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