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exif.cc
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exif.cc
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/*
Support for embedded (JPEG) Exif-GPS information.
Copyright (C) 2008 Olaf Klein, [email protected]
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., 59 Temple Place - Suite 330, Boston, MA 02111 USA
*/
/*
* Exif specifications can be found at
* 2012, version 2.3: http://www.cipa.jp/english/hyoujunka/kikaku/pdf/DC-008-2012_E.pdf
* 2010, version 2.3: http://www.cipa.jp/english/hyoujunka/kikaku/pdf/DC-008-2010_E.pdf
* 2002, version 2.2: http://www.exif.org/Exif2-2.PDF
* 1998, version 2.1: http://www.exif.org/Exif2-1.PDF
*/
#include "defs.h"
#include "garmin_tables.h"
#include "jeeps/gpsmath.h"
#include <QtCore/QFile>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#define MYNAME "exif"
// #define EXIF_DBG
#define UNKNOWN_TIMESTAMP 999999999
#define IFD0 0
#define IFD1 1
#define EXIF_IFD 2 /* dummy index */
#define GPS_IFD 3 /* dummy index */
#define INTER_IFD 4 /* dummy index */
#define EXIF_TYPE_BYTE 1
#define EXIF_TYPE_ASCII 2
#define EXIF_TYPE_SHORT 3
#define EXIF_TYPE_LONG 4
#define EXIF_TYPE_RAT 5
/* TIFF 6.0 */
#define EXIF_TYPE_SBYTE 6
#define EXIF_TYPE_UNK 7
#define EXIF_TYPE_SSHORT 8
#define EXIF_TYPE_SLONG 9
#define EXIF_TYPE_SRAT 10
#define EXIF_TYPE_FLOAT 11
#define EXIF_TYPE_DOUBLE 12
#define EXIF_TYPE_IFD 13
#define EXIF_TYPE_UNICODE 14
#define EXIF_TYPE_COMPLEX 15
#define EXIF_TYPE_LONG8 16
#define EXIF_TYPE_SLONG8 17
#define EXIF_TYPE_IFD8 18
#define BYTE_TYPE(a) ( (a==EXIF_TYPE_BYTE) || (a==EXIF_TYPE_ASCII) || (a==EXIF_TYPE_UNK) )
#define WORD_TYPE(a) ( (a==EXIF_TYPE_SHORT) || (a==EXIF_TYPE_SSHORT) )
#define LONG_TYPE(a) ( (a==EXIF_TYPE_LONG) || (a==EXIF_TYPE_SLONG) || (a==EXIF_TYPE_IFD) )
#define IFD0_TAG_EXIF_IFD_OFFS 0x8769
#define IFD0_TAG_GPS_IFD_OFFS 0x8825
#define IFD1_TAG_STRIP_OFFS 0x0111
#define IFD1_TAG_JPEG_OFFS 0x0201
#define IFD1_TAG_JPEG_SIZE 0x0202
#define EXIF_IFD_TAG_USER_CMT 0x9286
#define EXIF_IFD_TAG_INTER_IFD_OFFS 0xA005
#define GPS_IFD_TAG_VERSION 0x0000
#define GPS_IFD_TAG_LATREF 0x0001
#define GPS_IFD_TAG_LAT 0x0002
#define GPS_IFD_TAG_LONREF 0x0003
#define GPS_IFD_TAG_LON 0x0004
#define GPS_IFD_TAG_ALTREF 0x0005
#define GPS_IFD_TAG_ALT 0x0006
#define GPS_IFD_TAG_TIMESTAMP 0x0007
#define GPS_IFD_TAG_SAT 0x0008
#define GPS_IFD_TAG_MODE 0x000A
#define GPS_IFD_TAG_DOP 0x000B
#define GPS_IFD_TAG_SPEEDREF 0x000C
#define GPS_IFD_TAG_SPEED 0x000D
#define GPS_IFD_TAG_DATUM 0x0012
#define GPS_IFD_TAG_DATESTAMP 0x001D
typedef struct exif_tag_s {
queue Q;
uint16_t id;
uint16_t type;
uint32_t count;
uint32_t value;
uint32_t origin;
uint32_t size;
#ifdef EXIF_DBG
uint32_t offs;
#endif
unsigned char data_is_dynamic:1;
void* data;
} exif_tag_t;
typedef struct exif_ifd_s {
queue Q;
uint32_t next_ifd;
uint16_t nr;
uint16_t count;
queue tags;
} exif_ifd_t, *exif_ifd_p;
typedef struct exif_app_s {
queue Q;
uint16_t marker;
gbsize_t len;
gbfile* fcache;
gbfile* fexif;
queue ifds;
} exif_app_t;
static gbfile* fin, *fout;
static queue exif_apps;
static exif_app_t* exif_app;
const Waypoint* exif_wpt_ref;
time_t exif_time_ref;
static char exif_success;
static QString exif_fout_name;
static char* opt_filename, *opt_overwrite, *opt_frame, *opt_name;
static uint8_t writer_gps_tag_version[4] = {2, 0, 0, 0};
arglist_t exif_args[] = {
{ "filename", &opt_filename, "Set waypoint name to source filename", "Y", ARGTYPE_BOOL, ARG_NOMINMAX, nullptr },
{ "frame", &opt_frame, "Time-frame (in seconds)", "10", ARGTYPE_INT, "0", NULL, nullptr },
{ "name", &opt_name, "Locate waypoint for tagging by this name", NULL, ARGTYPE_STRING, ARG_NOMINMAX, nullptr },
{ "overwrite", &opt_overwrite, "!OVERWRITE! the original file. Default=N", "N", ARGTYPE_BOOL, ARG_NOMINMAX, nullptr },
ARG_TERMINATOR
};
#ifdef EXIF_DBG
static void
print_buff(const char* buf, int sz, const char* cmt)
{
int i;
printf("%s: ", cmt);
for (i = 0; i < sz; i++) {
printf("%02x ", buf[i] & 0xFF);
}
for (i = 0; i < sz; i++) {
char c = buf[i];
if (isspace(c)) {
c = ' ';
} else if (! isprint(c)) {
c = '.';
}
printf("%c", c);
}
}
#endif
static uint16_t
exif_type_size(const uint16_t type)
{
uint16_t size;
switch (type) {
case EXIF_TYPE_BYTE:
case EXIF_TYPE_ASCII:
case EXIF_TYPE_UNK:
size = 1;
break;
case EXIF_TYPE_SHORT:
case EXIF_TYPE_SSHORT:
case EXIF_TYPE_UNICODE:
size = 2;
break;
case EXIF_TYPE_IFD:
case EXIF_TYPE_LONG:
case EXIF_TYPE_SLONG:
case EXIF_TYPE_FLOAT:
size = 4;
break;
case EXIF_TYPE_RAT:
case EXIF_TYPE_SRAT:
case EXIF_TYPE_DOUBLE:
case EXIF_TYPE_LONG8:
case EXIF_TYPE_SLONG8:
case EXIF_TYPE_IFD8:
size = 8;
break;
default:
fatal(MYNAME ": Unknown data type %d! Please report.\n", type);
}
return size;
}
// TODO: If this were actually ever used (!?!?!) it could probably be
// replaced by return QDateTime(time).toString("yyyy/MM/dd, hh:mm:ss);
static QString
exif_time_str(const time_t time)
{
struct tm tm;
tm = *localtime(&time);
tm.tm_year += 1900;
tm.tm_mon += 1;
return QString().sprintf("%04d/%02d/%02d, %02d:%02d:%02d",
tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
}
static char*
exif_read_str(exif_tag_t* tag)
{
// Panasonic DMC-TZ10 stores datum with trailing spaces.
char* buf = xstrndup((char*)tag->data, tag->size);
rtrim(buf);
return buf;
}
static double
exif_read_double(const exif_tag_t* tag, const int index)
{
unsigned int num, den;
int32_t* data = (int32_t*)tag->data;
num = data[index * 2];
den = data[(index * 2) + 1];
if (den == 0) {
den = 1;
}
return (double)num / (double)den;
}
static double
exif_read_coord(const exif_tag_t* tag)
{
double res, min, sec;
res = exif_read_double(tag, 0);
if (tag->count == 1) {
return res;
}
min = exif_read_double(tag, 1);
res += (min / 60);
if (tag->count == 2) {
return res;
}
sec = exif_read_double(tag, 2);
res += (sec / 3600);
return res;
}
static time_t
exif_read_timestamp(const exif_tag_t* tag)
{
double hour, min, sec;
hour = exif_read_double(tag, 0);
min = exif_read_double(tag, 1);
sec = exif_read_double(tag, 2);
return ((int)hour * SECONDS_PER_HOUR) + ((int)min * 60) + (int)sec;
}
static time_t
exif_read_datestamp(const exif_tag_t* tag)
{
struct tm tm;
char* str;
memset(&tm, 0, sizeof(tm));
str = xstrndup((char*)tag->data, tag->size);
sscanf(str, "%d:%d:%d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
xfree(str);
tm.tm_year -= 1900;
tm.tm_mon -= 1;
return mkgmtime(&tm);
}
static void
exif_release_tag(exif_tag_t* tag)
{
dequeue(&tag->Q);
if (tag->data_is_dynamic) {
xfree(tag->data);
}
xfree(tag);
}
static void
exif_release_ifd(exif_ifd_t* ifd)
{
if (ifd != NULL) {
queue* elem, *tmp;
QUEUE_FOR_EACH(&ifd->tags, elem, tmp) {
exif_release_tag((exif_tag_t*)elem);
}
xfree(ifd);
}
}
static void
exif_release_apps()
{
queue* e0, *t0;
QUEUE_FOR_EACH(&exif_apps, e0, t0) {
queue* e1, *t1;
exif_app_t* app = (exif_app_t*)dequeue(e0);
if (app->fcache) {
gbfclose(app->fcache);
}
if (app->fexif) {
gbfclose(app->fexif);
}
QUEUE_FOR_EACH(&app->ifds, e1, t1) {
exif_ifd_t* ifd = (exif_ifd_t*)dequeue(e1);
exif_release_ifd(ifd);
}
xfree(app);
}
}
static uint32_t
exif_ifd_size(exif_ifd_t* ifd)
{
queue* elem, *tmp;
uint32_t res = 6; /* nr of tags + next_ifd */
res += (ifd->count * 12);
QUEUE_FOR_EACH(&ifd->tags, elem, tmp) {
exif_tag_t* tag = (exif_tag_t*)elem;
if (tag->size > 4) {
uint32_t size = tag->size;
if (size & 1) {
size++;
}
res += size;
}
}
return res;
}
static exif_app_t*
exif_load_apps()
{
exif_app_t* exif_app = NULL;
while (! gbfeof(fin)) {
exif_app_t* app = (exif_app_t*) xcalloc(sizeof(*app), 1);
ENQUEUE_TAIL(&exif_apps, &app->Q);
QUEUE_INIT(&app->ifds);
app->fcache = gbfopen(NULL, "wb", MYNAME);
app->marker = gbfgetuint16(fin);
app->len = gbfgetuint16(fin);
#ifdef EXIF_DBG
printf(MYNAME ": api = %02X, len = %d (0x%04x), offs = 0x%08X\n", app->marker & 0xFF, app->len, app->len, gbftell(fin));
#endif
if (exif_app || (app->marker == 0xFFDA)) /* compressed data */ {
gbfcopyfrom(app->fcache, fin, 0x7FFFFFFF);
#ifdef EXIF_DBG
printf(MYNAME ": compressed data size = %d\n", gbftell(app->fcache));
#endif
} else {
gbfcopyfrom(app->fcache, fin, app->len - 2);
if (app->marker == 0xFFE1) {
exif_app = app;
}
}
}
return exif_app;
}
static exif_ifd_t*
exif_read_ifd(exif_app_t* app, const uint16_t ifd_nr, gbsize_t offs,
uint32_t* exif_ifd_ofs, uint32_t* gps_ifd_ofs, uint32_t* inter_ifd_ofs)
{
queue* elem, *tmp;
uint16_t i;
exif_ifd_t* ifd;
gbfile* fin = app->fexif;
ifd = (exif_ifd_t*) xcalloc(sizeof(*ifd), 1);
QUEUE_INIT(&ifd->tags);
ENQUEUE_TAIL(&app->ifds, &ifd->Q);
ifd->nr = ifd_nr;
gbfseek(fin, offs, SEEK_SET);
ifd->count = gbfgetuint16(fin);
#ifdef EXIF_DBG
{
const char* name;
switch (ifd_nr) {
case IFD0:
name = "IFD0";
break;
case IFD1:
name = "IFD1";
break;
case GPS_IFD:
name = "GPS";
break;
case EXIF_IFD:
name = "EXIF";
break;
case INTER_IFD:
name = "INTER";
break;
default:
name = "private";
break;
}
printf(MYNAME "-offs 0x%08X: Number of items in IFD%d \"%s\" = %d (0x%04x)\n",
offs, ifd_nr, name, ifd->count, ifd->count);
}
#endif
if (ifd->count == 0) {
return ifd;
}
for (i = 0; i < ifd->count; i++) {
exif_tag_t* tag;
tag = (exif_tag_t*) xcalloc(sizeof(*tag), 1);
#ifdef EXIF_DBG
offs = gbftell(fin);
tag->offs = offs;
#endif
ENQUEUE_TAIL(&ifd->tags, &tag->Q);
tag->id = gbfgetuint16(fin);
tag->type = gbfgetuint16(fin);
tag->count = gbfgetuint32(fin);
tag->size = exif_type_size(tag->type) * tag->count;
tag->data = &tag->value;
if (BYTE_TYPE(tag->type) && (tag->count <= 4)) {
gbfread(tag->data, 4, 1, fin);
} else {
tag->value = gbfgetuint32(fin);
tag->origin = tag->value;
}
if (ifd_nr == IFD0) {
if (tag->id == IFD0_TAG_EXIF_IFD_OFFS) {
*exif_ifd_ofs = tag->value;
} else if (tag->id == IFD0_TAG_GPS_IFD_OFFS) {
*gps_ifd_ofs = tag->value;
}
} else if (ifd_nr == EXIF_IFD) {
if (tag->id == EXIF_IFD_TAG_INTER_IFD_OFFS) {
*inter_ifd_ofs = tag->value;
}
}
}
#ifdef EXIF_DBG
gbsize_t next_ifd_offs = gbftell(fin);
#endif
ifd->next_ifd = gbfgetuint32(fin);
QUEUE_FOR_EACH(&ifd->tags, elem, tmp) {
exif_tag_t* tag = (exif_tag_t*)elem;
if ((tag->size > 4) && (tag->value)) {
uint16_t i;
char* ptr;
tag->data = xmalloc(tag->size);
tag->data_is_dynamic = 1;
ptr = (char*) tag->data;
gbfseek(fin, tag->value, SEEK_SET);
if (BYTE_TYPE(tag->type)) {
gbfread(ptr, tag->count, 1, fin);
} else for (i = 0; i < tag->count; i++) {
switch (tag->type) {
case EXIF_TYPE_SHORT:
case EXIF_TYPE_SSHORT:
*(int16_t*)ptr = gbfgetuint16(fin);
break;
case EXIF_TYPE_IFD:
case EXIF_TYPE_LONG:
case EXIF_TYPE_SLONG:
*(int32_t*)ptr = gbfgetuint32(fin);
break;
case EXIF_TYPE_RAT:
case EXIF_TYPE_SRAT:
*(int32_t*)ptr = gbfgetuint32(fin);
*(int32_t*)(ptr+4) = gbfgetuint32(fin);
break;
case EXIF_TYPE_FLOAT:
*(float*)ptr = gbfgetflt(fin);
break;
case EXIF_TYPE_DOUBLE:
*(double*)ptr = gbfgetdbl(fin);
break;
default:
gbfread(ptr, 1, 1, fin);
break;
}
ptr += (tag->size / tag->count);
}
}
#ifdef EXIF_DBG
printf(MYNAME "-offs 0x%08X: ifd=%d id=0x%04X t=0x%04X c=%4d s=%4d v=0x%08X",
tag->offs, ifd->nr, tag->id, tag->type, tag->count, tag->size, tag->value);
if (tag->type == EXIF_TYPE_ASCII) {
printf(" \"%s\"", exif_read_str(tag));
}
printf("\n");
#endif
}
#ifdef EXIF_DBG
printf(MYNAME "-offs 0x%08X: Next IFD=0x%08X\n", next_ifd_offs, ifd->next_ifd);
#endif
return ifd;
}
static void
exif_read_app(exif_app_t* app)
{
gbsize_t offs;
uint32_t exif_ifd_ofs, gps_ifd_ofs, inter_ifd_ofs;
exif_ifd_t* ifd;
gbfile* fin = app->fexif;
#ifdef EXIF_DBG
printf(MYNAME ": read_app...\n");
print_buff((const char*)fin->handle.mem, 8, MYNAME "-offs 0x00000000: Image File Header");
printf("\n");
#endif
exif_ifd_ofs = gps_ifd_ofs = inter_ifd_ofs = 0;
gbfseek(fin, 4, SEEK_SET);
offs = gbfgetuint32(fin);
ifd = exif_read_ifd(app, IFD0, offs, &exif_ifd_ofs, &gps_ifd_ofs, &inter_ifd_ofs);
if (ifd == NULL) {
return;
}
if (ifd->next_ifd) {
ifd = exif_read_ifd(app, IFD1, ifd->next_ifd, &exif_ifd_ofs, &gps_ifd_ofs, &inter_ifd_ofs);
}
if (exif_ifd_ofs) {
ifd = exif_read_ifd(app, EXIF_IFD, exif_ifd_ofs, NULL, NULL, &inter_ifd_ofs);
}
if (gps_ifd_ofs) {
ifd = exif_read_ifd(app, 3, gps_ifd_ofs, NULL, NULL, NULL);
}
if (inter_ifd_ofs) {
ifd = exif_read_ifd(app, 4, inter_ifd_ofs, NULL, NULL, NULL);
}
// The return values of exif_read_ifd above aren't actually used.
// Warning hush.
(void) ifd;
}
static void
exif_examine_app(exif_app_t* app)
{
uint16_t endianess;
uint32_t ident;
gbfile* ftmp = exif_app->fcache;
gbfrewind(ftmp);
ident = gbfgetuint32(ftmp);
is_fatal(ident != 0x66697845, MYNAME ": Invalid EXIF header magic.");
is_fatal(gbfgetint16(ftmp) != 0, MYNAME ": Error in EXIF header.");
endianess = gbfgetint16(ftmp);
#ifdef EXIF_DBG
printf(MYNAME ": endianess = 0x%04X\n", endianess);
#endif
if (endianess == 0x4949) {
ftmp->big_endian = 0;
} else if (endianess == 0x4D4D) {
ftmp->big_endian = 1;
} else {
fatal(MYNAME ": Invalid endianess identifier 0x%04X!\n", endianess);
}
gbfseek(ftmp, 6, SEEK_SET);
app->fexif = gbfopen(NULL, "wb", MYNAME);
app->fexif->big_endian = ftmp->big_endian;
gbfcopyfrom(app->fexif, ftmp, 0x7FFFFFFF);
exif_read_app(exif_app);
}
static exif_ifd_t*
exif_find_ifd(exif_app_t* app, const uint16_t ifd_nr)
{
queue* e0, *t0;
QUEUE_FOR_EACH(&app->ifds, e0, t0) {
exif_ifd_t* ifd = (exif_ifd_t*)e0;
if (ifd->nr == ifd_nr) {
return ifd;
}
}
return NULL;
}
static exif_tag_t*
exif_find_tag(exif_app_t* app, const uint16_t ifd_nr, const uint16_t tag_id)
{
exif_ifd_t* ifd = exif_find_ifd(app, ifd_nr);
if (ifd != NULL) {
queue* elem, *tmp;
QUEUE_FOR_EACH(&ifd->tags, elem, tmp) {
exif_tag_t* tag = (exif_tag_t*)elem;
if (tag->id == tag_id) {
return tag;
}
}
}
return NULL;
}
static time_t
exif_get_exif_time(exif_app_t* app)
{
QDateTime res;
exif_tag_t* tag;
tag = exif_find_tag(app, EXIF_IFD, 0x9003); /* DateTimeOriginal from EXIF */
if (! tag) {
tag = exif_find_tag(app, IFD0, 0x0132); /* DateTime from IFD0 */
}
if (! tag) {
tag = exif_find_tag(app, EXIF_IFD, 0x9004); /* DateTimeDigitized from EXIF */
}
if (tag) {
char* str;
str = exif_read_str(tag);
res = QDateTime::fromString(str, "yyyy:MM:dd hh:mm:ss");
xfree(str);
}
return res.toTime_t();
}
static Waypoint*
exif_waypt_from_exif_app(exif_app_t* app)
{
Waypoint* wpt;
queue* elem, *tmp;
exif_ifd_t* ifd;
exif_tag_t* tag;
char lat_ref = '\0';
char lon_ref = '\0';
char alt_ref = 0;
char speed_ref = 'K';
char* datum = NULL;
char mode = '\0';
double gpsdop = unknown_alt;
double alt = unknown_alt;
time_t timestamp = UNKNOWN_TIMESTAMP;
time_t datestamp = UNKNOWN_TIMESTAMP;
ifd = exif_find_ifd(app, GPS_IFD);
if (ifd == NULL) {
return NULL;
}
wpt = new Waypoint;
wpt->latitude = unknown_alt;
wpt->longitude = unknown_alt;
QUEUE_FOR_EACH(&ifd->tags, elem, tmp) {
tag = (exif_tag_t*)elem;
switch (tag->id) {
case GPS_IFD_TAG_VERSION:
break;
case GPS_IFD_TAG_LATREF:
lat_ref = *(char*)tag->data;
break;
case GPS_IFD_TAG_LAT:
wpt->latitude = exif_read_coord(tag);
break;
case GPS_IFD_TAG_LONREF:
lon_ref = *(char*)tag->data;
break;
case GPS_IFD_TAG_LON:
wpt->longitude = exif_read_coord(tag);
break;
case GPS_IFD_TAG_ALTREF:
alt_ref = *(char*)tag->data;
break;
case GPS_IFD_TAG_ALT:
alt = exif_read_double(tag, 0);
break;
case GPS_IFD_TAG_TIMESTAMP:
timestamp = exif_read_timestamp(tag);
break;
case GPS_IFD_TAG_SAT:
wpt->sat = atoi((char*)tag->data);
break;
case GPS_IFD_TAG_MODE:
mode = *(char*)tag->data;
break;
case GPS_IFD_TAG_DOP:
gpsdop = exif_read_double(tag, 0);
break;
case GPS_IFD_TAG_SPEEDREF:
speed_ref = *(char*)tag->data;
break;
case GPS_IFD_TAG_SPEED:
WAYPT_SET(wpt, speed, exif_read_double(tag, 0));
break;
case GPS_IFD_TAG_DATUM:
datum = exif_read_str(tag);
break;
case GPS_IFD_TAG_DATESTAMP:
datestamp = exif_read_datestamp(tag);
break;
}
}
if ((wpt->latitude == unknown_alt) || (wpt->longitude == unknown_alt)) {
fatal(MYNAME ": Missing GPSLatitude and/or GPSLongitude!\n");
}
if (lat_ref == 'S') {
wpt->latitude *= -1;
} else if (lat_ref != 'N') {
warning(MYNAME ": GPSLatitudeRef not set! Using N(orth).\n");
}
if (lon_ref == 'W') {
wpt->longitude *= -1;
} else if (lon_ref != 'E') {
warning(MYNAME ": GPSLongitudeRef not set! Using E(east).\n");
}
#ifdef EXIF_DBG
printf(MYNAME "-GPSLatitude = %12.7f\n", wpt->latitude);
printf(MYNAME "-GPSLongitude = %12.7f\n", wpt->longitude);
#endif
if (datum) {
int idatum = gt_lookup_datum_index(datum, MYNAME);
if (idatum < 0) {
fatal(MYNAME ": Unknown GPSMapDatum \"%s\"!\n", datum);
}
if (idatum != DATUM_WGS84) {
double alt;
GPS_Math_WGS84_To_Known_Datum_M(wpt->latitude, wpt->longitude, 0.0,
&wpt->latitude, &wpt->longitude, &alt, idatum);
}
xfree(datum);
}
if (alt != unknown_alt) {
double sign;
switch (alt_ref) {
case 0:
sign = 1.0;
break;
case 1:
sign = -1.0;
break;
default:
warning(MYNAME ": Invalid GPSAltitudeRef (%d)! Using default value 0 (= Sea level).\n", alt_ref);
sign = 1.0;
}
wpt->altitude = sign * alt;
#ifdef EXIF_DBG
printf(MYNAME "-GPSAltitude = %12.7f m\n", wpt->altitude);
#endif
}
if WAYPT_HAS(wpt, speed) {
switch (speed_ref) {
case 'K':
wpt->speed = KPH_TO_MPS(wpt->speed);
break;
case 'M':
wpt->speed = MPH_TO_MPS(wpt->speed);
break;
case 'N':
wpt->speed = KNOTS_TO_MPS(wpt->speed);
break;
default:
wpt->speed = 0;
WAYPT_UNSET(wpt, speed);
warning(MYNAME ": Unknown GPSSpeedRef unit %c (0x%02x)!\n", speed_ref, speed_ref);
}
#ifdef EXIF_DBG
if WAYPT_HAS(wpt, speed) {
printf(MYNAME "-GPSSpeed = %12.2f m/s\n", wpt->speed);
}
#endif
}
if (mode == '2') {
wpt->fix = fix_2d;
if (gpsdop != unknown_alt) {
wpt->hdop = gpsdop;
}
} else if (mode == '3') {
wpt->fix = fix_3d;
if (gpsdop != unknown_alt) {
wpt->pdop = gpsdop;
}
}
if (timestamp != UNKNOWN_TIMESTAMP) {
if (datestamp != UNKNOWN_TIMESTAMP) {
timestamp += datestamp;
}
} else {
timestamp = datestamp;
}
if (timestamp != UNKNOWN_TIMESTAMP) {
#ifdef EXIF_DBG
QString str = QDateTime::fromTime_t(timestamp).toUTC().toString(Qt::ISODate);
printf(MYNAME "-GPSTimeStamp = %s\n", qPrintable(str));
#endif
wpt->SetCreationTime(timestamp);
} else {
wpt->SetCreationTime(exif_get_exif_time(app));
}
tag = exif_find_tag(app, EXIF_IFD, EXIF_IFD_TAG_USER_CMT); /* UserComment */
if (tag && (tag->size > 8)) {
QString str;
if (memcmp(tag->data, "ASCII\0\0\0", 8) == 0) {
wpt->notes = QString::fromLatin1((char*) tag->data + 8, tag->size - 8);
} else if (memcmp(tag->data, "UNICODE\0", 8) == 0) {
// I'm not at all sure that casting alignment away like this is a good
// idea in light of arches that don't allow unaligned loads, but in the
// absence of test data that captures it and the grubbiness of the code
// that was here before, I'm going to do this and then come back to it
// if it's a problem.
wpt->notes = QString::fromUtf16((const uint16_t*)((char*) tag->data + 8), tag->size - 8);
}
}
if (opt_filename) {
char* c, *cx;
char* str = xstrdup(fin->name);
cx = str;
if ((c = strrchr(cx, ':'))) {
cx = c + 1;
}
if ((c = strrchr(cx, '\\'))) {
cx = c + 1;
}
if ((c = strrchr(cx, '/'))) {
cx = c + 1;
}
if (((c = strchr(cx, '.'))) && (c != cx)) {
*c = '\0';
}
wpt->shortname = cx;
xfree(str);
}
return wpt;
}
static void
exif_dec2frac(double val, int32_t* num, int32_t* den)
{
char sval[16], snum[16];
char dot = 0;
int den1 = 1;
int num1, num2, den2, rem;
char* cx;
double vx;
if (val < 0.000000001) {
val = 0.0;
} else if (val > 999999999.0) {
fatal(MYNAME ": Value (%f) to big for a rational representation!\n", val);
}
num1 = 0;
vx = fabs(val);
while (vx > 1) {
num1++;
vx = vx / 10;
}
snprintf(sval, sizeof(sval), "%*.*f", 9, 9 - num1, fabs(val));
snum[0] = '\0';
cx = sval;
while (*cx) {
if (dot) {
den1 *= 10;
}
if (*cx == '.') {
dot = 1;
} else {
strncat(snum, cx, 1);
}
cx++;
}
num1 = atoi(snum);
if (den1 == 1) {
*num = num1;
*den = den1;
}
num2 = num1;
den2 = den1;
rem = 1;
/* Euclid's Algorithm to find the gcd */
while (num2 % den2) {
rem = num2 % den2;
num2 = den2;
den2 = rem;
}
if (den2 != den1) {
rem = den2;
}
*num = num1 / rem;
*den = den1 / rem;
}
static exif_tag_t*
exif_put_value(const int ifd_nr, const uint16_t tag_id, const uint16_t type, const uint32_t count, const int index, const void* data)
{
exif_tag_t* tag = NULL;
exif_ifd_t* ifd;
uint16_t item_size, size;
ifd = exif_find_ifd(exif_app, ifd_nr);
if (ifd == NULL) {
ifd = (exif_ifd_t*) xcalloc(sizeof(*ifd), 1);
ifd->nr = ifd_nr;
QUEUE_INIT(&ifd->tags);
ENQUEUE_TAIL(&exif_app->ifds, &ifd->Q);
} else {
tag = exif_find_tag(exif_app, ifd_nr, tag_id);
}
item_size = exif_type_size(type);
if ((data == NULL) || (count < 1) || (index < 0)) {
size = 0;
} else {
size = (index + count) * item_size;
}
if (tag == NULL) {
if (size == 0) {
return NULL;
}
tag = (exif_tag_t*) xcalloc(sizeof(*tag), 1);