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    • Jim Fulton's avatar
      We recently added estimated_size. We originally added it as a new · dc125607
      Jim Fulton authored
      unsigned long field after a signed char state field and a 3-character
      reserved field.  This didn't work because there are packages in the
      wild that have their own copies of cPersistence.h that didn't see the
      update.
      
      To get around this, we used the reserved space by making
      estimated_size a 24-bit bit field in the space occupied by the old
      3-character reserved field.  To fit in 24 bits, we made the units of
      estimated_size 64-character blocks.  This allows is to handle up to a
      GB.  We should never see that, but to be paranoid, we also truncate
      sizes greater than 1GB.  We also set the minimum size to 64 bytes.
      dc125607