This prevents girders from erasing landbacktex (square windows in tunnels and such), at the cost of requiring lfBasic and lfObject to be treated the same apart from graphically
#include "quaadler32.h"
#include "zlib.h"
QuaAdler32::QuaAdler32()
{
reset();
}
quint32 QuaAdler32::calculate(const QByteArray &data)
{
return adler32( adler32(0L, Z_NULL, 0), (const Bytef*)data.data(), data.size() );
}
void QuaAdler32::reset()
{
checksum = adler32(0L, Z_NULL, 0);
}
void QuaAdler32::update(const QByteArray &buf)
{
checksum = adler32( checksum, (const Bytef*)buf.data(), buf.size() );
}
quint32 QuaAdler32::value()
{
return checksum;
}