* If at page start, we must skip over the page header.  But
we can't 
                 * do that until we've read in the page, since the header
size is 
                 * variable. 

i don't know the meaning behind this comments,

 if ((RecPtr->xrecoff % XLogSegSize) == 0) 
it's a long page header, else a short page header,

so "the header size" can be calculated ? right?

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