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[geohash] Modified geohash implementation (based on python-geohash) with no mallocs

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Al
2015-07-04 00:30:35 -04:00
parent f825dcb939
commit 3f07cc6c71
2 changed files with 519 additions and 326 deletions
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108
src/geohash/geohash.h
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@@ -1,77 +1,49 @@
/*
* geohash.h
* libgeohash
*
* Created by Derek Smith on 10/6/09.
* Copyright (c) 2010, SimpleGeo
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
/*** MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
* Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer. Redistributions in binary form must
* reproduce the above copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the distribution.
* Neither the name of the SimpleGeo nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
// Metric in meters
typedef struct GeoBoxDimensionStruct {
double height;
double width;
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
} GeoBoxDimension;
#ifndef GEOHASH_H
#define GEOHASH_H
typedef struct GeoCoordStruct {
double latitude;
double longitude;
double north;
double east;
double south;
double west;
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
GeoBoxDimension dimension;
} GeoCoord;
#ifdef __cplusplus
extern "C" {
#endif
/*
* Creates a the hash at the specified precision. If precision is set to 0.
* or less than it defaults to 12.
*/
extern char* geohash_encode(double lat, double lng, int precision);
enum {
GEOHASH_OK,
GEOHASH_NOTSUPPORTED,
GEOHASH_INVALIDCODE,
GEOHASH_INVALIDARGUMENT,
GEOHASH_INTERNALERROR,
GEOHASH_NOMEMORY
};
/*
* Returns the latitude and longitude used to create the hash along with
* the bounding box for the encoded coordinate.
*/
extern GeoCoord geohash_decode(char* hash);
int geohash_encode(double latitude, double longitude, char* r, size_t capacity);
int geohash_decode(char* r, size_t length, double *latitude, double *longitude);
int geohash_neighbors(char *hashcode, char* dst, size_t dst_length, int *string_count);
/*
* Return an array of geohashes that represent the neighbors of the passed
* in value. The neighbors are indexed as followed:
*
* N, NE, E, SE, S, SW, W, NW
* 0, 1, 2, 3, 4, 5, 6, 7
*/
extern char** geohash_neighbors(char* hash);
#ifdef __cplusplus
}
#endif
/*
* Returns the width and height of a precision value.
*/
extern GeoBoxDimension geohash_dimensions_for_precision(int precision);
#endif