void dwgCompressor::copyBlock21(const duint32 length)
{
    if (MaxBlock21Length < length) {
        return;
    }

    const duint8 *order {CopyOrder21[length]};
    if (nullptr == order) {
        return;
    }

    for (duint32 index = 0; (length > index) && buffersGood(); ++index) {
        decompSet( compressedByte( compressedPos + order[index]));
    }
    compressedInc( length);
}
void dwgCompressor::copyBlock21(const duint32 length)
{
    if (MaxBlock21Length < length) {
        return;
    }

    const duint8 *order {CopyOrder21[length]};
    if (nullptr == order) {
        return;
    }

    for (duint32 index = 0; (length > index) && buffersGood(); ++index) {
        decompSet( compressedByte( compressedPos + order[index]));
    }
    compressedInc( length);
}