OVERFLOW_SIZE
if( offset<OVERFLOW_SIZE ){
if( a + offset > OVERFLOW_SIZE ){
a = OVERFLOW_SIZE - offset;
offset -= OVERFLOW_SIZE;
if( n>OVERFLOW_SIZE ){
n = OVERFLOW_SIZE;
memset(pOvfl->aPayload, 0, OVERFLOW_SIZE);
spaceLeft = OVERFLOW_SIZE;
char aPayload[OVERFLOW_SIZE];
Pgno aFree[(OVERFLOW_SIZE-sizeof(int))/sizeof(Pgno)];
int nPage = (sz - MX_LOCAL_PAYLOAD + OVERFLOW_SIZE - 1)/OVERFLOW_SIZE;
assert( sizeof(FreelistInfo)==OVERFLOW_SIZE );