138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
/*
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Copyright (c) 2006 Alex Tingle
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "utils.h"
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#include <fstream>
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#include <iostream>
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#include <cmath>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace FloodUtils {
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unsigned short sqrt(unsigned long a) {
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return std::sqrt(a);
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}
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std::list<std::string> split(const std::string& s, char token) {
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std::list<std::string> result;
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std::string::size_type pos=0;
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while(true)
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{
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pos=s.find_first_not_of(token,pos);
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if(pos==std::string::npos) break;
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std::string::size_type token_pos=s.find_first_of(token,pos);
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result.push_back( s.substr(pos,token_pos-pos) );
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pos=token_pos;
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}
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return result;
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}
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void googleXY_to_latlng(
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double x, double y, int zoom,
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double& lng, double& lat
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)
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{
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googleX_to_lng(zoom,x,lng);
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googleY_to_lat(zoom,y,lat);
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}
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void googleX_to_lng(int zoom, double x, double& lng)
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{
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long tilesAtThisZoom =googleMaxTiles(zoom);
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lng = -180.0 + (x * 360.0 / double(tilesAtThisZoom));
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}
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void googleY_to_lat(int zoom, double y, double& lat)
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{
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// This function is the inverse Mercator projection.
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// Look up 'Mercator projection' on Wikipedia for details.
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long pixels = googleMaxTiles(zoom) * 256L;
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double pixelsPerLonRadian = pixels / (2.0 * M_PI);
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double bitmapOrigo = pixels / 2;
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double Y = (bitmapOrigo - y*256) / pixelsPerLonRadian;
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double latRad = 2.0 * ::atan( ::exp(Y) ) - M_PI_2;
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lat = latRad * 180.0 / M_PI;
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}
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/*
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* Implementation copyright (C) 2004, Alex Tingle.
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*/
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size_t strlcpy(char* dst, const char* src, size_t bufsize)
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{
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size_t srclen =strlen(src);
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size_t result =srclen; /* Result is always the length of the src string */
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if(bufsize>0)
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{
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if(srclen>=bufsize)
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srclen=bufsize-1;
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if(srclen>0)
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memcpy(dst,src,srclen);
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dst[srclen]='\0';
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}
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return result;
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}
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size_t strlcat(char* dst, const char* src, size_t bufsize)
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{
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size_t dstlen =strlen(dst);
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size_t srclen =strlen(src);
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size_t result =dstlen+srclen;
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/* truncate srclen to the buffer */
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if(result>=bufsize)
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srclen=bufsize-dstlen-1;
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if(srclen>0) /* if there is anything left to copy. */
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{
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dst+=dstlen;
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memcpy(dst,src,srclen);
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dst[srclen]='\0';
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}
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return result;
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}
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int getpid()
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{
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return int(::getpid());
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}
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const char* getenvz(const char* name, const char* dflt)
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{
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const char* result =::getenv(name);
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if(!result)
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result=dflt;
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return result;
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}
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bool exists(const char* path) {
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std::ifstream ifile(path);
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return ifile;
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}
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} // end namespace FloodUtils
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