ADDINC128
ADDINC128(context->bitcount, freespace << 3);
ADDINC128(context->bitcount, len << 3);
ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
ADDINC128(context->bitcount, len << 3);
ADDINC128(context->bitcount, freespace << 3);
ADDINC128(context->bitcount, len << 3);
ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
ADDINC128(context->bitcount, len << 3);