integration/luprex/core/cpp/util.cpp

#include <string>
#include <vector>
#include <fstream>
#include <cstdlib>
#include "util.hpp"
#include <sys/types.h>
#include <sys/stat.h>
#ifndef WIN32
#include <unistd.h>
#define stat _stat
#endif

namespace util {

std::string tolower(std::string input) {
    for (int i = 0; i < int(input.size()); i++) {
        input[i] = std::tolower(input[i]);
    }
    return input;
}

std::string toupper(std::string input) {
    for (int i = 0; i < int(input.size()); i++) {
        input[i] = std::toupper(input[i]);
    }
    return input;
}

int64_t strtoint(const std::string &value, int64_t errval) {
    char *endptr;
    int64_t result = strtoll(value.c_str(), &endptr, 10);
    if (endptr == value.c_str() + value.size()) {
        return result;
    } else {
        return errval;
    }
}

std::string ltrim(std::string s) {
    s.erase(s.begin(), std::find_if(s.begin(), s.end(),
            std::not1(std::ptr_fun<int, int>(std::isspace))));
    return s;
}

std::string rtrim(std::string s) {
    s.erase(std::find_if(s.rbegin(), s.rend(),
            std::not1(std::ptr_fun<int, int>(std::isspace))).base(), s.end());
    return s;
}

std::string trim(std::string s) {
    return ltrim(rtrim(s));
}


std::string get_file_contents(const std::string &fn) {
    std::ifstream fs(fn);
    std::stringstream buffer;
    buffer << fs.rdbuf();
    return buffer.str();
}

stringvec get_file_lines(const std::string &path) {
    stringvec result;
    std::ifstream f;
    f.open(path);
    if (f) {
        std::string line;
        while (std::getline(f, line)) {
            result.push_back(line);
        }
        f.close();
    }
    return result;
}

std::string get_file_fingerprint(const std::string &fn) {
    struct stat result;
    if(stat(fn.c_str(), &result)==0)
    {
        std::stringstream ss;
        ss << result.st_mtime;
        return ss.str();
    }
    return "";
}

double distance_squared(double x1, double y1, double x2, double y2) {
    double dx = x1 - x2;
    double dy = y1 - y2;
    return dx*dx + dy*dy;
}

// These hash functions are part of Bob Jenkins' Lookup3.
#define hash_rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))

#define hash_mix(a,b,c) { \
    a -= c; a ^= hash_rot(c, 4); c += b; \
    b -= a; b ^= hash_rot(a, 6); a += c; \
    c -= b; c ^= hash_rot(b, 8); b += a; \
    a -= c; a ^= hash_rot(c,16); c += b; \
    b -= a; b ^= hash_rot(a,19); a += c; \
    c -= b; c ^= hash_rot(b, 4); b += a; \
}

#define hash_final(a,b,c) { \
    c ^= b; c -= hash_rot(b,14); \
    a ^= c; a -= hash_rot(c,11); \
    b ^= a; b -= hash_rot(a,25); \
    c ^= b; c -= hash_rot(b,16); \
    a ^= c; a -= hash_rot(c,4);  \
    b ^= a; b -= hash_rot(a,14); \
    c ^= b; c -= hash_rot(b,24); \
}

uint32_t hash3(uint32_t a, uint32_t b, uint32_t c) {
    hash_final(a, b, c);
    return c;
}

double hash_to_float(double lo, double hi, uint32_t a, uint32_t b, uint32_t c) {
    double result = hash3(a, b, c); // Lossless.
    result *= (1.0 / 0xFFFFFFFF);
    result *= (hi-lo);
    result += lo;
    return result;
}

std::ostream & operator << (std::ostream &out, const XYZ &xyz) { 
    out << "(" << xyz.x << "," << xyz.y << "," << xyz.z << ")";
    return out; 
}

} // namespace util