address.c File Reference

Address routines. More...

#include "local_proto.h"

Include dependency graph for address.c:

Go to the source code of this file.

Macros
#define	SEG_N_ROW_NONZERO(SEG, row, col)    (((row) >> (SEG)->srowbits) * (SEG)->spr + ((col) >> (SEG)->scolbits))
#define	SEG_INDEX_ROW_NONZERO(SEG, row, col)
#define	SEG_N_ROW_ZERO(SEG, col)   ((col) >> (SEG)->scolbits)
#define	SEG_INDEX_ROW_ZERO(SEG, col)   ((col) & ((SEG)->scols - 1))
#define	INDEX_ADJ(SEG, i)    ((SEG)->fast_seek ? ((i) << (SEG)->lenbits) : ((i) * (SEG)->len))

Functions
int	seg_address_fast (const SEGMENT *SEG, off_t row, off_t col, int *n, int *index)
int	seg_address_slow (const SEGMENT *SEG, off_t row, off_t col, int *n, int *index)
int	seg_address (const SEGMENT *SEG, off_t row, off_t col, int *n, int *index)
	Internal use only. More...

Detailed Description

Address routines.

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author

GRASS GIS Development Team

Date

2005-2009

Definition in file address.c.

Macro Definition Documentation

INDEX_ADJ

#define INDEX_ADJ	(		SEG,
			i
	)		((SEG)->fast_seek ? ((i) << (SEG)->lenbits) : ((i) * (SEG)->len))

Definition at line 27 of file address.c.

SEG_INDEX_ROW_NONZERO

#define SEG_INDEX_ROW_NONZERO	(		SEG,
			row,
			col
	)

Value:

    ((((row) & ((SEG)->srows - 1)) << (SEG)->scolbits) + \
     ((col) & ((SEG)->scols - 1)))

Definition at line 19 of file address.c.

SEG_INDEX_ROW_ZERO

#define SEG_INDEX_ROW_ZERO	(		SEG,
			col
	)		((col) & ((SEG)->scols - 1))

Definition at line 25 of file address.c.

SEG_N_ROW_NONZERO

#define SEG_N_ROW_NONZERO	(		SEG,
			row,
			col
	)		(((row) >> (SEG)->srowbits) * (SEG)->spr + ((col) >> (SEG)->scolbits))

Definition at line 16 of file address.c.

SEG_N_ROW_ZERO

#define SEG_N_ROW_ZERO	(		SEG,
			col
	)		((col) >> (SEG)->scolbits)

Definition at line 23 of file address.c.

Function Documentation

seg_address()

int seg_address	(	const SEGMENT *	SEG,
		off_t	row,
		off_t	col,
		int *	n,
		int *	index
	)

Internal use only.

Gets segment address and setsn and index.

Parameters

[in]	SEG	segment
[in]	row
[in]	col
[in,out]	n
[in,out]	index

Returns

always returns 0

Definition at line 108 of file address.c.

References SEGMENT::address.

seg_address_fast()

int seg_address_fast	(	const SEGMENT *	SEG,
		off_t	row,
		off_t	col,
		int *	n,
		int *	index
	)

Definition at line 30 of file address.c.

References SEGMENT::fast_seek, INDEX_ADJ, SEGMENT::len, SEGMENT::lenbits, SEGMENT::scolbits, SEGMENT::scols, SEG_INDEX_ROW_NONZERO, SEG_INDEX_ROW_ZERO, SEG_N_ROW_NONZERO, SEG_N_ROW_ZERO, SEGMENT::spr, SEGMENT::srowbits, and SEGMENT::srows.

Referenced by seg_setup().

seg_address_slow()

int seg_address_slow	(	const SEGMENT *	SEG,
		off_t	row,
		off_t	col,
		int *	n,
		int *	index
	)

Definition at line 74 of file address.c.

References SEGMENT::len, SEGMENT::scols, SEGMENT::spr, and SEGMENT::srows.

Referenced by seg_setup().