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- #ifndef GRASS_SEGMENT_H
- #define GRASS_SEGMENT_H
- #include <grass/gis.h>
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #ifdef HAVE_SYS_TYPES_H
- #include <sys/types.h>
- #endif
- struct aq { /* age queue */
- int cur; /* segment number */
- struct aq *younger, *older; /* pointer to next younger and next older */
- } ;
- typedef struct
- {
- int open; /* open flag */
- off_t nrows; /* rows in original data */
- off_t ncols; /* cols in original data */
- int len; /* bytes per data value */
- int srows; /* rows in segments */
- int scols; /* cols in segments */
- int srowscols; /* rows x cols in segments */
- int size; /* size in bytes of a segment */
- int spr; /* segments per row */
- int spill; /* cols in last segment in row */
- /* fast mode */
- int fast_adrs; /* toggles fast address mode */
- off_t scolbits; /* column bitshift */
- off_t srowbits; /* row bitshift */
- off_t segbits; /* segment bitshift */
- int fast_seek; /* toggles fast seek mode */
- int lenbits; /* data size bitshift */
- int sizebits; /* segment size bitshift */
- int (*address)();
- int (*seek)();
-
- char *fname; /* segment file name */
- int fd; /* file descriptor to read/write segment */
- struct scb /* control blocks */
- {
- char *buf; /* data buffer */
- char dirty; /* dirty flag */
- struct aq *age; /* pointer to position in age queue */
- int n; /* segment number */
- } *scb;
- int *load_idx; /* index of loaded segments */
- int nfreeslots; /* number of free slots */
- int *freeslot; /* array of free slots */
- struct aq *agequeue, /* queue of age for order of access */
- *youngest, /* youngest in age queue */
- *oldest; /* oldest in age queue */
- int nseg; /* number of segments in memory */
- int cur; /* last accessed segment */
- int offset; /* offset of data past header */
- char *cache; /* all in memory cache */
- } SEGMENT;
- #include <grass/defs/segment.h>
- #endif /* GRASS_SEGMENT_H */
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