d7322b6f2f
They were under /deps since they originate from a different source tree, however at this point they are very modified and we took ownership of both the files making changes, fixing bugs, so there is no upgrade path from the original code tree. Given that, better to move the code under /src with proper dependencies and with a more simpler editing experience.
119 lines
4.0 KiB
C
119 lines
4.0 KiB
C
/*
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* Copyright (c) 2013-2014, yinqiwen <yinqiwen@gmail.com>
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* Copyright (c) 2014, Matt Stancliff <matt@genges.com>.
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* Copyright (c) 2015, Salvatore Sanfilippo <antirez@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GEOHASH_H_
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#define GEOHASH_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <stdint.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#define HASHISZERO(r) (!(r).bits && !(r).step)
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#define RANGEISZERO(r) (!(r).max && !(r).min)
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#define RANGEPISZERO(r) (r == NULL || RANGEISZERO(*r))
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#define GEO_STEP_MAX 26 /* 26*2 = 52 bits. */
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/* Limits from EPSG:900913 / EPSG:3785 / OSGEO:41001 */
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#define GEO_LAT_MIN -85.05112878
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#define GEO_LAT_MAX 85.05112878
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#define GEO_LONG_MIN -180
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#define GEO_LONG_MAX 180
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typedef enum {
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GEOHASH_NORTH = 0,
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GEOHASH_EAST,
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GEOHASH_WEST,
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GEOHASH_SOUTH,
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GEOHASH_SOUTH_WEST,
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GEOHASH_SOUTH_EAST,
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GEOHASH_NORT_WEST,
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GEOHASH_NORT_EAST
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} GeoDirection;
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typedef struct {
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uint64_t bits;
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uint8_t step;
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} GeoHashBits;
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typedef struct {
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double min;
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double max;
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} GeoHashRange;
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typedef struct {
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GeoHashBits hash;
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GeoHashRange longitude;
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GeoHashRange latitude;
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} GeoHashArea;
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typedef struct {
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GeoHashBits north;
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GeoHashBits east;
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GeoHashBits west;
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GeoHashBits south;
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GeoHashBits north_east;
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GeoHashBits south_east;
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GeoHashBits north_west;
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GeoHashBits south_west;
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} GeoHashNeighbors;
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/*
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* 0:success
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* -1:failed
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*/
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void geohashGetCoordRange(GeoHashRange *long_range, GeoHashRange *lat_range);
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int geohashEncode(GeoHashRange *long_range, GeoHashRange *lat_range,
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double longitude, double latitude, uint8_t step,
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GeoHashBits *hash);
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int geohashEncodeType(double longitude, double latitude,
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uint8_t step, GeoHashBits *hash);
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int geohashEncodeWGS84(double longitude, double latitude, uint8_t step,
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GeoHashBits *hash);
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int geohashDecode(const GeoHashRange long_range, const GeoHashRange lat_range,
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const GeoHashBits hash, GeoHashArea *area);
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int geohashDecodeType(const GeoHashBits hash, GeoHashArea *area);
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int geohashDecodeWGS84(const GeoHashBits hash, GeoHashArea *area);
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int geohashDecodeAreaToLongLat(const GeoHashArea *area, double *xy);
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int geohashDecodeToLongLatType(const GeoHashBits hash, double *xy);
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int geohashDecodeToLongLatWGS84(const GeoHashBits hash, double *xy);
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int geohashDecodeToLongLatMercator(const GeoHashBits hash, double *xy);
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void geohashNeighbors(const GeoHashBits *hash, GeoHashNeighbors *neighbors);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* GEOHASH_H_ */
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