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