overte/shared/src/SharedUtil.cpp

//
//  SharedUtil.cpp
//  hifi
//
//  Created by Stephen Birarda on 2/22/13.
//
//

#include <cstdlib>
#include <cstdio>
#include "SharedUtil.h"

#ifdef __APPLE__
#include <CoreFoundation/CoreFoundation.h>
#endif

double usecTimestamp(timeval *time) {
    return (time->tv_sec * 1000000.0 + time->tv_usec);
}

double usecTimestampNow() {
    timeval now;
    gettimeofday(&now, NULL);
    return (now.tv_sec * 1000000.0 + now.tv_usec);
}

float randFloat () {
    return (rand() % 10000)/10000.f;
}

unsigned char randomColorValue(int miniumum) {
    return miniumum + (rand() % (255 - miniumum));
}

bool randomBoolean() {
    return rand() % 2;
}

void outputBits(unsigned char byte) {
    printf("%d: ", byte);
    
    for (int i = 0; i < 8; i++) {
        printf("%d", byte >> (7 - i) & 1);
    }
    
    printf("\n");
}

int numberOfOnes(unsigned char byte) {
    return (byte >> 7)
        + ((byte >> 6) & 1)
        + ((byte >> 5) & 1)
        + ((byte >> 4) & 1)
        + ((byte >> 3) & 1)
        + ((byte >> 2) & 1)
        + ((byte >> 1) & 1)
        + (byte & 1);
}

bool oneAtBit(unsigned char byte, int bitIndex) {
    return (byte >> (7 - bitIndex) & 1);
}

void switchToResourcesIfRequired() {
#ifdef __APPLE__
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef resourcesURL = CFBundleCopyResourcesDirectoryURL(mainBundle);
    char path[PATH_MAX];
    if (!CFURLGetFileSystemRepresentation(resourcesURL, TRUE, (UInt8 *)path, PATH_MAX)) {
        // error!
    }
    CFRelease(resourcesURL);
    
    chdir(path);
#endif
}

//////////////////////////////////////////////////////////////////////////////////////////
// Function:    getCmdOption()
// Description: Handy little function to tell you if a command line flag and option was
//              included while launching the application, and to get the option value
//              immediately following the flag. For example if you ran:
//                      ./app -i filename.txt
//              then you're using the "-i" flag to set the input file name.
// Usage:       char * inputFilename = getCmdOption(argv, argv + argc, "-i");
// Complaints:  Brad :)
char* getCmdOption(char ** begin, char ** end, const std::string & option)
{
    char ** itr = std::find(begin, end, option);
    if (itr != end && ++itr != end)
    {
        return *itr;
    }
    return 0;
}

//////////////////////////////////////////////////////////////////////////////////////////
// Function:    getCmdOption()
// Description: Handy little function to tell you if a command line option flag was
//              included while launching the application. Returns bool true/false
// Usage:       bool wantDump   = cmdOptionExists(argv, argv+argc, "-d");
// Complaints:  Brad :)
bool cmdOptionExists(char** begin, char** end, const std::string& option)
{
    return std::find(begin, end, option) != end;
}