geotag.cpp

// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2021 Exiv2 authors
 * This program is part of the Exiv2 distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */
// geotag.cpp
// Sample program to read gpx files and update images with GPS tags
// g++ geotag.cpp -o geotag -lexiv2 -lexpat

#include <exiv2/exiv2.hpp>
#include "unused.h"

#include <iostream>
#include <iomanip>
#include <cassert>
#include <algorithm>

#include <stdio.h>
#include <cstdlib>
#include <time.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <expat.h>

#include <vector>
#include <string>

#if defined(__MINGW32__) || defined(__MINGW64__)
# ifndef  __MINGW__
#  define __MINGW__
# endif
#endif

using namespace std;

#ifndef  lengthof
#define  lengthof(x) (sizeof(*x)/sizeof(x))
#endif

#if defined(_MSC_VER) || defined(__MINGW__)
#include <windows.h>
char*    realpath(const char* file,char* path);
#define  lstat _stat
#define  stat  _stat
#if      _MSC_VER < 1400
#define strcpy_s(d,l,s) strcpy(d,s)
#define strcat_s(d,l,s) strcat(d,s)
#endif
#endif

#if ! defined(_MSC_VER)
#include <dirent.h>
#include <unistd.h>
#include <sys/param.h>
#define  stricmp strcasecmp
#endif

#ifndef _MAX_PATH
#define _MAX_PATH 1024
#endif

// prototypes
class Options;
int getFileType(const char* path ,Options& options);
int getFileType(std::string& path,Options& options);

string getExifTime(time_t t);
time_t parseTime(const char* ,bool bAdjust=false);
int    timeZoneAdjust();

// platform specific code
#if defined(_MSC_VER) || defined(__MINGW__)
char* realpath(const char* file,char* path)
{
    char* result = (char*) malloc(_MAX_PATH);
    if   (result) GetFullPathName(file,_MAX_PATH,result,NULL);
    return result ;
    UNUSED(path);
}
#endif

// Command-line parser
class Options  {
public:
    bool        verbose{false};
    bool        help{false};
    bool        version{false};
    bool        dst{false};
    bool        dryrun{false};
    bool        ascii{false};

    Options() = default;
    virtual ~Options() = default;
} ;

enum
{   resultOK=0
,   resultSyntaxError
,   resultSelectFailed
};

enum                        // keyword indices
{   kwHELP = 0
,   kwVERSION
,   kwDST
,   kwDRYRUN
,   kwASCII
,   kwVERBOSE
,   kwADJUST
,   kwTZ
,   kwDELTA
,   kwMAX                   // manages keyword array
,   kwNEEDVALUE             // bogus keywords for error reporting
,   kwSYNTAX                // -- ditto --
,   kwNOVALUE = -kwVERBOSE  // keywords <= kwNOVALUE are flags (no value needed)
};

// file types supported
enum
{   typeUnknown   = 0
,   typeDirectory = 1
,   typeImage     = 2
,   typeXML       = 3
,   typeFile      = 4
,   typeDoc       = 5
,   typeCode      = 6
,   typeMax       = 7
};

// forward declaration
class Position;

// globals
using TimeDict_t = std::map<time_t, Position>;
using TimeDict_i = std::map<time_t, Position>::iterator;
using strings_t = std::vector<std::string>;
const char* gDeg = nullptr;  // string "°" or "deg"
TimeDict_t   gTimeDict   ;
strings_t    gFiles;

// Position (from gpx file)
class Position
{
public:
    Position(time_t time, double lat, double lon, double ele) :
        time_(time)
      , lon_(lon)
      , lat_(lat)
      , ele_(ele)
    {}

    Position() = default;
    virtual ~Position() = default;

    //  instance methods
    bool good() const
    {
        return time_ || lon_ || lat_ || ele_;
    }
    std::string getTimeString() { if ( times_.empty() ) times_ = getExifTime(time_) ;  return times_; }
    time_t getTime() const
    {
        return time_;
    }
    std::string toString() const;

    //  getters/setters
    double lat() const
    {
        return lat_;
    }
    double lon() const
    {
        return lon_;
    }
    double ele() const
    {
        return ele_;
    }
    int delta() const
    {
        return delta_;
    }
    void   delta(int delta) {delta_=delta  ;}

//  data
private:
    time_t time_{0};
    double lon_{0.0};
    double lat_{0.0};
    double ele_{0.0};
    std::string times_;
    int delta_{0};

    // public static data
public:
    static int    adjust_  ;
    static int    tz_      ;
    static int    dst_     ;
    static time_t deltaMax_;

// public static member functions

    static int    Adjust() {return Position::adjust_ + Position::tz_ + Position::dst_ ;}
    static int    tz()     {return tz_    ;}
    static int    dst()    {return dst_   ;}
    static int    adjust() {return adjust_;}

    static std::string toExifString(double d,bool bRational,bool bLat);
    static std::string toExifString(double d);
    static std::string toExifTimeStamp(std::string& t);
};

std::string Position::toExifTimeStamp(std::string& t)
{
    char        result[200];
    const char* arg = t.c_str();
    int HH = 0 ;
    int mm = 0 ;
    int SS1 = 0 ;
    if ( strstr(arg,":") || strstr(arg,"-") ) {
        int YY=0,MM=0,DD=0;
        char a=0,b=0,c=0,d=0,e=0;
        sscanf(arg,"%d%c%d%c%d%c%d%c%d%c%d",&YY,&a,&MM,&b,&DD,&c,&HH,&d,&mm,&e,&SS1);
    }
    snprintf(result,sizeof(result),"%d/1 %d/1 %d/1",HH,mm,SS1);
    return std::string(result);
}

std::string Position::toExifString(double d)
{
    char result[200];
    d *= 100;
    snprintf(result, sizeof(result), "%d/100", abs(static_cast<int>(d)));
    return std::string(result);
}

std::string Position::toExifString(double d,bool bRational,bool bLat)
{
    const char* NS   = d>=0.0?"N":"S";
    const char* EW   = d>=0.0?"E":"W";
    const char* NSEW = bLat  ? NS: EW;
    if ( d < 0 ) d = -d;
    int deg = static_cast<int>(d);
    d -= deg;
    d *= 60;
    int min = static_cast<int>(d);
    d -= min;
    d *= 60;
    int sec = static_cast<int>(d);
    char result[200];
    if ( bRational )
        snprintf(result,sizeof(result),"%d/1 %d/1 %d/1" ,deg,min,sec);
    else
        snprintf(result,sizeof(result),"%03d%s%02d'%02d\"%s" ,deg,gDeg,min,sec,NSEW);
    return std::string(result);
}

std::string Position::toString() const
{
    char result[200];
    std::string sLat = Position::toExifString(lat_,false,true );
    std::string sLon = Position::toExifString(lon_,false,false);
    snprintf(result,sizeof(result),"%s %s %-8.3f",sLon.c_str(),sLat.c_str(),ele_);
    return std::string(result);
}

// defaults
int    Position::adjust_   = 0;
int    Position::tz_       = timeZoneAdjust();
int    Position::dst_      = 0;
time_t Position::deltaMax_ = 60 ;

///////////////////////////////////////////////////////////
// UserData - used by XML Parser
struct UserData final
{
    explicit UserData(Options& options)
        : options_(options)
    {}

    //  public data members
    int         indent{0};
    size_t      count{0};
    Position    now ;
    Position    prev;
    int         nTrkpt{0};
    bool        bTime{false};
    bool        bEle{false};
    double      ele{0.};
    double      lat{0.};
    double      lon{0.};
    std::string xmlt;
    std::string exift;
    time_t      time{0};
    Options&    options_;
// static public data memembers
};

// XML Parser Callbacks
static void startElement(void* userData, const char* name, const char** atts )
{
    auto me = static_cast<UserData*>(userData);
    //for ( int i = 0 ; i < me->indent ; i++ ) printf(" ");
    //printf("begin %s\n",name);
    me->bTime = strcmp(name,"time")==0;
    me->bEle  = strcmp(name,"ele")==0;

    if ( strcmp(name,"trkpt")==0 ) {
        me->nTrkpt++;
        while ( *atts ) {
            const char* a=atts[0];
            const char* v=atts[1];
            if ( !strcmp(a,"lat") ) me->lat = atof(v);
            if ( !strcmp(a,"lon") ) me->lon = atof(v);
            atts += 2 ;
        }
    }
    me->count++  ;
    me->indent++ ;
}

static void endElement(void* userData, const char* name)
{
    auto me = static_cast<UserData*>(userData);
    me->indent-- ;
    if ( strcmp(name,"trkpt")==0 ) {

        me->nTrkpt--;
        me->now = Position(me->time,me->lat,me->lon,me->ele) ;

        if ( !me->prev.good() && me->options_.verbose ) {
            printf("trkseg %s begin ",me->now.getTimeString().c_str());
        }

        // remember our location and put it in gTimeDict
        gTimeDict[me->time] = me->now ;
        me->prev = me->now ;
    }
    if ( strcmp(name,"trkseg")==0 && me->options_.verbose ) {
        printf("%s end\n",me->now.getTimeString().c_str());
    }
}

void charHandler(void* userData,const char* s,int len)
{
    auto me = static_cast<UserData*>(userData);

    if ( me->nTrkpt == 1 ) {
        char buffer[100];
        int  l_max = 98 ; // lengthof(buffer) -2 ;

        if ( me->bTime && len > 5 ) {
            if ( len < l_max ) {
                memcpy(buffer,s,len);
                buffer[len]=0;
                char* b = buffer ;
                while ( *b == ' ' && b < buffer+len ) b++ ;
                me->xmlt  = b ;
                me->time  = parseTime(me->xmlt.c_str());
                me->exift = getExifTime(me->time);
            }
            me->bTime=false;
        }
        if ( me->bEle && len > 2 ) {
            if ( len < l_max ) {
                memcpy(buffer,s,len);
                buffer[len]=0;
                char* b = buffer ;
                while ( *b == ' ' && b < buffer+len ) b++ ;
                me->ele = atof(b);
            }
            me->bEle=false;
        }
    }
}

///////////////////////////////////////////////////////////
// Time Functions
time_t parseTime(const char* arg,bool bAdjust)
{
    time_t result = 0 ;
    try {
        //559 rmills@rmills-imac:~/bin $ exiv2 -pa ~/R.jpg | grep -i date
        //Exif.Image.DateTime                          Ascii      20  2009:08:03 08:58:57
        //Exif.Photo.DateTimeOriginal                  Ascii      20  2009:08:03 08:58:57
        //Exif.Photo.DateTimeDigitized                 Ascii      20  2009:08:03 08:58:57
        //Exif.GPSInfo.GPSDateStamp                    Ascii      21  2009-08-03T15:58:57Z

        // <time>2012-07-14T17:33:16Z</time>

        if ( strstr(arg,":") || strstr(arg,"-") ) {
            int  YY=0,MM=0,DD=0,HH=0,mm=0,SS1=0;
            char a=0,b=0,c=0,d=0,e=0;
            sscanf(arg,"%d%c%d%c%d%c%d%c%d%c%d",&YY,&a,&MM,&b,&DD,&c,&HH,&d,&mm,&e,&SS1);

            struct tm T;
            memset(&T,0,sizeof(T));
            T.tm_min  = mm  ;
            T.tm_hour = HH  ;
            T.tm_sec  = SS1 ;
            if ( bAdjust ) T.tm_sec -= Position::Adjust();
            T.tm_year = YY -1900 ;
            T.tm_mon  = MM -1    ;
            T.tm_mday = DD  ;
            T.tm_isdst = -1 ; // determine value automatically (otherwise hour may shift)
            result = mktime(&T);
        }
    } catch ( ... ) {};
    return result ;
}

// West of GMT is negative (PDT = Pacific Daylight = -07:00 == -25200 seconds
int timeZoneAdjust()
{
    time_t now = time(nullptr);
    int       offset;

#if   defined(_MSC_VER) || defined(__MINGW__)
    TIME_ZONE_INFORMATION TimeZoneInfo;
    GetTimeZoneInformation( &TimeZoneInfo );
    offset = - (((int)TimeZoneInfo.Bias + (int)TimeZoneInfo.DaylightBias) * 60);
    UNUSED(now);
#elif defined(__CYGWIN__)
    struct tm lcopy = *localtime(&now);
    time_t    gmt   =  timegm(&lcopy) ; // timegm modifies lcopy
    offset          = (int) ( ((long signed int) gmt) - ((long signed int) now) ) ;
#elif defined(OS_SOLARIS) || defined(__sun__)
    struct tm local = *localtime(&now) ;
    time_t local_tt = (int) mktime(&local);
    time_t time_gmt = (int) mktime(gmtime(&now));
    offset          = time_gmt - local_tt;
#else
    struct tm local = *localtime(&now) ;
    offset          = local.tm_gmtoff ;

#if EXIV2_DEBUG_MESSAGES
    struct tm utc = *gmtime(&now);
    printf("utc  :  offset = %6d dst = %d time = %s", 0     ,utc  .tm_isdst, asctime(&utc  ));
    printf("local:  offset = %6d dst = %d time = %s", offset,local.tm_isdst, asctime(&local));
    printf("timeZoneAdjust = %6d\n",offset);
#endif
#endif
    return offset ;
}

string getExifTime(const time_t t)
{
    static char result[100];
    strftime(result,sizeof(result),"%Y-%m-%d %H:%M:%S",localtime(&t));
    return result ;
}

std::string makePath(const std::string& dir, const std::string& file)
{
    return dir + std::string(EXV_SEPARATOR_STR) + file ;
}

const char* makePath(const char* dir,const char* file)
{
    static char result[_MAX_PATH] ;
    std::string r = makePath(std::string(dir),std::string(file));
    strcpy(result,r.c_str());
    return result;
}

// file utilities
bool readDir(const char* path,Options& options)
{
    bool bResult = false;

#ifdef _MSC_VER
    DWORD attrs    =  GetFileAttributes(path);
    bool  bOKAttrs =  attrs != INVALID_FILE_ATTRIBUTES;
    bool  bIsDir   = (attrs  & FILE_ATTRIBUTE_DIRECTORY) ? true : false ;

    if( bOKAttrs && bIsDir ) {
        bResult = true ;

        char     search[_MAX_PATH+10];
        strcpy_s(search,_MAX_PATH,path);
        strcat_s(search,_MAX_PATH,"\\*");

        WIN32_FIND_DATA ffd;
        HANDLE  hFind = FindFirstFile(search, &ffd);
        BOOL    bGo = hFind != INVALID_HANDLE_VALUE;

        if ( bGo ) {
            while ( bGo ) {
                if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
                {
                    // _tprintf(TEXT("  %s   <DIR>\n"), ffd.cFileName);
                }
                else
                {
                    std::string pathName = makePath(path,std::string(ffd.cFileName));
                    if ( getFileType(pathName,options) == typeImage ) {
                        gFiles.push_back( pathName );
                    }
                }
                bGo = FindNextFile(hFind, &ffd) != 0;
            }
            // CloseHandle(hFind);
        }
    }
#else
    DIR*    dir = opendir (path);
    if (dir != nullptr) {
        bResult = true;
        struct dirent*  ent;

        // print all the files and directories within directory
        while ((ent = readdir(dir)) != nullptr) {
            std::string pathName = makePath(path,ent->d_name);
            struct stat  buf     ;
            lstat(path, &buf );
            if ( ent->d_name[0] != '.' ) {

                // printf("reading %s => %s\n",ent->d_name,pathName.c_str());
                if ( getFileType(pathName,options) == typeImage ) {
                    gFiles.push_back( pathName );
                }
            }
        }
        closedir (dir);
    }
#endif
    return bResult ;
}

inline size_t sip(FILE* f,char* buffer,size_t max_len,size_t len)
{
    while ( !feof(f) && len < max_len && buffer[len-1] != '>')
        buffer[len++] = fgetc(f);
    return len;
}

bool readXML(const char* path,Options& options)
{
    FILE*       f       = fopen(path,"r");
    XML_Parser parser = XML_ParserCreate(nullptr);
    bool bResult        = f && parser ;
    if ( bResult ) {
        char   buffer[8*1024];
        UserData me(options) ;

        XML_SetUserData            (parser, &me);
        XML_SetElementHandler      (parser, startElement, endElement);
        XML_SetCharacterDataHandler(parser,charHandler);

        // a little sip at the data
        size_t len = fread(buffer,1,sizeof(buffer)-100,f);
        const char* lead   = "<?xml" ;
        bResult = strncmp(lead,buffer,strlen(lead))==0;

        // swallow it
        if ( bResult ) {
            len = sip(f,buffer,sizeof buffer,len);
            bResult = XML_Parse(parser, buffer, static_cast<int>(len), len == 0) == XML_STATUS_OK;
        }

        // drink the rest of the file
        while ( bResult && len != 0 ) {
            len = fread(buffer,1,sizeof(buffer)-100,f);
            len = sip(f,buffer,sizeof buffer,len);
            bResult = XML_Parse(parser, buffer, static_cast<int>(len), len == 0) == XML_STATUS_OK;
        };
    }

    if ( f      ) fclose(f);
    if ( parser ) XML_ParserFree(parser);

    return bResult ;
}

bool readImage(const char* path,Options& /* options */)
{
    using namespace Exiv2;
    bool bResult = false ;

    try {
        Image::UniquePtr image = ImageFactory::open(path);
        if ( image.get() ) {
            image->readMetadata();
            ExifData &exifData = image->exifData();
            bResult = !exifData.empty();
        }
    } catch ( ... ) {};
    return bResult ;
}

time_t readImageTime(const std::string& path, std::string* pS = nullptr)
{
    using namespace Exiv2;

    time_t       result       = 0 ;

    const char* dateStrings[] = {"Exif.Photo.DateTimeOriginal", "Exif.Photo.DateTimeDigitized", "Exif.Image.DateTime",
                                 nullptr};
    const char* dateString = dateStrings[0] ;

    do {
        try {
            Image::UniquePtr image = ImageFactory::open(path);
            if ( image.get() ) {
                image->readMetadata();
                ExifData &exifData = image->exifData();
            //  printf("%s => %s\n",dateString, exifData[dateString].toString().c_str());
                result = parseTime(exifData[dateString].toString().c_str(),true);
                if ( result && pS ) *pS = exifData[dateString].toString();
            }
        } catch ( ... ) {};
    } while ( !result && ++dateString );

    return result ;
}

bool sina(const char* s,const char** a)
{
    bool bResult = false ;
    int i = 0 ;
    while ( *s == '-' ) s++;
    while ( !bResult && a[i]) {
        const char* A = a[i] ;
        while ( *A == '-' ) A++ ;
        bResult = stricmp(s,A)==0;
        i++;
    }
    return bResult;
}

int readFile(const char* path, const Options& /* options */)
{
    FILE* f     = fopen(path,"r");
    int nResult = f ? typeFile : typeUnknown;
    if (  f ) {
        const char*  ext   = strstr(path,".");
        if  ( ext ) {
            const char* docs[] = {".doc", ".txt", nullptr};
            const char* code[] = {".cpp", ".h", ".pl", ".py", ".pyc", nullptr};
            if ( sina(ext,docs) )
                nResult = typeDoc;
            if ( sina(ext,code) )
                nResult = typeCode;
        }
        fclose(f);
    }

    return nResult ;
}

Position* searchTimeDict(TimeDict_t& td, const time_t& time,long long delta)
{
    Position* result = nullptr;
    for ( int t = 0 ; !result && t < delta ; t++ ) {
        for ( int x = 0 ; !result && x < 2 ; x++ ) {
            int T = t * ((x==0)?-1:1);
            if ( td.count(time+T) ) {
                result = &td[time+T];
                result->delta(T);
            }
        }
    }
    return result;
}

int getFileType(std::string& path,Options& options) { return getFileType(path.c_str(),options); }
int getFileType(const char* path,Options& options)
{
    return readXML  (path,options) ? typeXML
        :  readDir  (path,options) ? typeDirectory
        :  readImage(path,options) ? typeImage
        :  readFile (path,options)
        ;
}

int version(const char* program)
{
    printf("%s: %s %s\n",program,__DATE__,__TIME__);
    return 0;
}

int help(const char* program,char const* words[],int nWords,bool /*bVerbose*/)
{
    printf("usage: %s ",program);
    for ( int i = 0 ; i < nWords ; i++ ) {
        if ( words[i] )
            printf("%c-%s%s",i?'|':'{',words[i],i>(-kwNOVALUE)?" value":"");
    }
    printf("}+ path+\n");
    return 0;
}

int compare(const char* a,const char* b)
{
    int result=*a && *b;
    while ( result && *a && *b) {
        char A=*a++;
        char B=*b++;
        result=tolower(A)==tolower(B);
    }
    return result;
}

int find(const char* arg,char const* words[],int nWords)
{
    if ( arg[0] != '-' ) return kwSYNTAX;

    int result=0;
    int count =0;

    for ( int i = 0 ; i < nWords ; i++) {
        int j = 0 ;
        while ( arg[j] == '-' ) j++;
        if ( ::compare(arg+j,words[i]) ) {
            result = i ;
            count++;
        }
    }

    return count==1?result:kwSYNTAX;
}

int parseTZ(const char* adjust)
{
    int   h=0;
    int   m=0;
    char  c=0;
    try {
        sscanf(adjust,"%d%c%d",&h,&c,&m);
    } catch ( ... ) {} ;

    return (3600*h)+(60*m);
}

bool mySort(const std::string& a, const std::string& b)
{
    time_t A = readImageTime(a);
    time_t B = readImageTime(b);
    return (A<B);
}

int main(int argc,const char* argv[])
{
    Exiv2::XmpParser::initialize();
    ::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
    Exiv2::enableBMFF();
#endif

    int result=0;
    const char* program = argv[0];

    const char* types[typeMax];
    types[typeUnknown  ] = "unknown";
    types[typeDirectory] = "directory";
    types[typeImage    ] = "image";
    types[typeXML      ] = "xml";
    types[typeDoc      ] = "doc";
    types[typeCode     ] = "code";
    types[typeFile     ] = "file";

    char const* keywords[kwMAX];
    memset(keywords,0,sizeof(keywords));
    keywords[kwHELP    ] = "help";
    keywords[kwVERSION ] = "version";
    keywords[kwVERBOSE ] = "verbose";
    keywords[kwDRYRUN  ] = "dryrun";
    keywords[kwASCII   ] = "ascii";
    keywords[kwDST     ] = "dst";
    keywords[kwADJUST  ] = "adjust";
    keywords[kwTZ      ] = "tz";
    keywords[kwDELTA   ] = "delta";

    map<std::string,string> shorts;
    shorts["-?"] = "-help";
    shorts["-h"] = "-help";
    shorts["-v"] = "-verbose";
    shorts["-V"] = "-version";
    shorts["-d"] = "-dst";
    shorts["-a"] = "-adjust";
    shorts["-t"] = "-tz";
    shorts["-D"] = "-delta";
    shorts["-s"] = "-delta";
    shorts["-X"] = "-dryrun";
    shorts["-A"] = "-ascii";

    Options options ;
    options.help    = sina(keywords[kwHELP   ],argv) || argc < 2;
    options.verbose = sina(keywords[kwVERBOSE],argv);
    options.dryrun  = sina(keywords[kwDRYRUN ],argv);
    options.version = sina(keywords[kwVERSION],argv);
    options.dst     = sina(keywords[kwDST    ],argv);
    options.ascii   = sina(keywords[kwASCII  ],argv);

    for ( int i = 1 ; !result && i < argc ; i++ ) {
        const char* arg   = argv[i++];
        if ( shorts.count(arg) ) arg = shorts[arg].c_str();

        const char* value = argv[i  ];
        int        ivalue = ::atoi(value?value:"0");
        int         key   = ::find(arg,keywords,kwMAX);
        int         needv = key < kwMAX && key > (-kwNOVALUE);

        if (!needv ) i--;
        if ( needv && !value) key = kwNEEDVALUE;

        switch ( key ) {
            case kwDST      : options.dst         = true ; break;
            case kwHELP     : options.help        = true ; break;
            case kwVERSION  : options.version     = true ; break;
            case kwDRYRUN   : options.dryrun      = true ; break;
            case kwVERBOSE  : options.verbose     = true ; break;
            case kwASCII    : options.ascii       = true ; break;
            case kwTZ       : Position::tz_       = parseTZ(value);break;
            case kwADJUST   : Position::adjust_   = ivalue;break;
            case kwDELTA    : Position::deltaMax_ = ivalue;break;
            case kwNEEDVALUE: fprintf(stderr,"error: %s requires a value\n",arg); result = resultSyntaxError ; break ;
            case kwSYNTAX   : default:
            {
                int  type   = getFileType(arg,options) ;
                if ( options.verbose ) printf("%s %s ",arg,types[type]) ;
                if ( type == typeImage ) {
                    time_t t    = readImageTime(std::string(arg)) ;
#ifdef __APPLE__
                    char   buffer[1024];
#else
                    char* buffer = nullptr;
#endif
                    char*  path = realpath(arg,buffer);
                    if  ( t && path ) {
                        if (options.verbose)
                            printf("%s %ld %s", path, static_cast<long int>(t), asctime(localtime(&t)));
                        gFiles.push_back(path);
                    }
                    if (path && path != buffer)
                        ::free(path);
                }
                if ( type == typeUnknown ) {
                    fprintf(stderr,"error: illegal syntax %s\n",arg);
                    result = resultSyntaxError ;
                }
            } break;
        }
    }

    if ( options.help    ) ::help(program,keywords,kwMAX,options.verbose);
    if ( options.version ) ::version(program);
    gDeg = options.ascii ? "deg" : "°";

    if ( !result ) {
        sort(gFiles.begin(),gFiles.end(),mySort);
        if ( options.dst ) Position::dst_ = 3600;
        if ( options.verbose ) {
            int t = Position::tz();
            int d = Position::dst();
            int a = Position::adjust();
            int A = Position::Adjust();
            int s = A     ;
            int h = s/3600;
                s-= h*3600;
                s = abs(s);
            int m = s/60  ;
                s-= m*60  ;
            printf("tz,dst,adjust = %d,%d,%d total = %dsecs (= %d:%d:%d)\n",t,d,a,A,h,m,s);
        }
/*
        if ( options.verbose ) {
            printf("Time Dictionary\n");
            for ( TimeDict_i it = gTimeDict.begin() ;  it != gTimeDict.end() ; it++ ) {
                std::string sTime = getExifTime(it->first);
                Position*   pPos  = &it->second;
                std::string sPos  = Position::toExifString(pPos->lat(),false,true)
                                  + " "
                                  + Position::toExifString(pPos->lon(),false,true)
                                  ;
                printf("%s %s\n",sTime.c_str(), sPos.c_str());
            }
        }
*/
        for (auto&& path : gFiles) {
            std::string stamp ;
            try {
                time_t t       = readImageTime(path,&stamp) ;
                Position* pPos = searchTimeDict(gTimeDict,t,Position::deltaMax_);
                Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(path);
                if ( image.get() ) {
                    image->readMetadata();
                    Exiv2::ExifData& exifData = image->exifData();
                    if ( pPos ) {
                        exifData["Exif.GPSInfo.GPSProcessingMethod" ] = "charset=Ascii HYBRID-FIX";
                        exifData["Exif.GPSInfo.GPSVersionID"        ] = "2 2 0 0";
                        exifData["Exif.GPSInfo.GPSMapDatum"         ] = "WGS-84";

                        exifData["Exif.GPSInfo.GPSLatitude"         ] = Position::toExifString(pPos->lat(),true,true);
                        exifData["Exif.GPSInfo.GPSLongitude"        ] = Position::toExifString(pPos->lon(),true,false);
                        exifData["Exif.GPSInfo.GPSAltitude"         ] = Position::toExifString(pPos->ele());

                        exifData["Exif.GPSInfo.GPSAltitudeRef"      ] = pPos->ele()<0.0?"1":"0";
                        exifData["Exif.GPSInfo.GPSLatitudeRef"      ] = pPos->lat()>0?"N":"S";
                        exifData["Exif.GPSInfo.GPSLongitudeRef"     ] = pPos->lon()>0?"E":"W";

                        exifData["Exif.GPSInfo.GPSDateStamp"        ] = stamp;
                        exifData["Exif.GPSInfo.GPSTimeStamp"        ] = Position::toExifTimeStamp(stamp);
                        exifData["Exif.Image.GPSTag"                ] = 4908;

                        printf("%s %s % 2d\n",path.c_str(),pPos->toString().c_str(),pPos->delta());
                    } else {
                        printf("%s *** not in time dict ***\n",path.c_str());
                    }
                    if ( !options.dryrun ) image->writeMetadata();
                }
            } catch ( ... ) {};
        }
    }

    return result ;
}

// That's all Folks!
////