typedef struct MetaBlock MetaBlock;
typedef struct MetaEntry MetaEntry;

#define MaxBlock (1UL<<31)

enum {
       BytesPerEntry = 100,    /* estimate of bytes per dir entries - determines number of index entries in the block */
       FullPercentage = 80,    /* don't allocate in block if more than this percentage full */
       FlushSize = 200,        /* number of blocks to flush */
       DirtyPercentage = 50    /* maximum percentage of dirty blocks */
};


struct MetaEntry
{
       uchar *p;
       ushort size;
};

struct MetaBlock
{
       int maxsize;            /* size of block */
       int size;               /* size used */
       int free;               /* free space within used size */
       int maxindex;           /* entries allocated for table */
       int nindex;             /* amount of table used */
       int unbotch;
       uchar *buf;
};

struct VacDirEnum
{
       VacFile *file;
       u32int boff;
       int i, n;
       VacDir *buf;
};