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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* Exif specifications can be found at
* 2016, version 2.31: http://www.cipa.jp/std/documents/e/DC-008-Translation-2016-E.pdf
* 2012, version 2.3: http://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf
* 2010, version 2.3: http://www.cipa.jp/std/documents/e/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
*
* TIFF specifications can be found at
* version 6.0: https://www.itu.int/itudoc/itu-t/com16/tiff-fx/docs/tiff6.pdf
* version 6.0: http://www.npes.org/pdf/TIFF-v6.pdf
* version 6.0: http://www.alternatiff.com/resources/TIFF6.pdf
*/
#include "exif.h"
#include <QByteArray> // for QByteArray
#include <QDate> // for QDate
#include <QDateTime> // for QDateTime
#include <QFile> // for QFile
#include <QFileInfo> // for QFileInfo
#include <QList> // for QList
#include <QPair> // for QPair
#include <QRegularExpression> // for QRegularExpressionMatch, QRegularExpression
#include <QString> // for QString
#include <QTextCodec> // for QTextCodec
#include <QTime> // for QTime
#ifdef LIGHTWEIGHT_TIMEZONES_SUPPORTED
#include <QTimeZone> // for QTimeZone
#endif
#include <QVariant> // for QVariant
#include <QVector> // for QVector
#include <Qt> // for UTC, ISODate
#include <QtGlobal> // for qPrintable, qint64
#include <algorithm> // for sort, min
#include <cassert> // for assert
#include <cctype> // for isprint, isspace
#include <cfloat> // for DBL_EPSILON
#include <cmath> // for fabs, modf, copysign, round, fmax
#include <cstdint> // for uint32_t, int32_t, uint16_t, int16_t, uint8_t, INT32_MAX
#include <cstdio> // for printf, SEEK_SET, snprintf, SEEK_CUR
#include <cstdlib> // for abs
#include <cstring> // for memcmp, strlen
#include <utility> // for as_const
#include "defs.h" // for Waypoint, fatal, warning, global_options, global_opts, unknown_alt, xfree, route_disp_all, track_disp_all, waypt_disp_all, wp_flags, KNOTS_TO_MPS, KPH_TO_MPS, MPH_TO_MPS, MPS_TO_KPH, WAYPT_HAS, case_ignore_strcmp, waypt_add, fix_2d
#include "garmin_tables.h" // for gt_lookup_datum_index
#include "gbfile.h" // for gbfputuint32, gbfputuint16, gbfgetuint16, gbfgetuint32, gbfseek, gbftell, gbfile, gbfclose, gbfcopyfrom, gbfwrite, gbfopen_be, gbfread, gbfrewind, gbfgetflt, gbfgetint16, gbfopen, gbfputc, gbfputflt, gbsize_t, gbfeof, gbfgetdbl, gbfputdbl, gbfile::(anonymous)
#include "jeeps/gpsmath.h" // for GPS_Math_WGS84_To_Known_Datum_M
#include "src/core/datetime.h" // for DateTime
#define MYNAME "exif"
#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
#define EXIF_TYPE_SBYTE 6 /* TIFF 6.0 */
#define EXIF_TYPE_UNK 7 /* TIFF 6.0 */
#define EXIF_TYPE_SSHORT 8 /* TIFF 6.0 */
#define EXIF_TYPE_SLONG 9 /* TIFF 6.0 */
#define EXIF_TYPE_SRAT 10 /* TIFF 6.0 */
#define EXIF_TYPE_FLOAT 11 /* TIFF 6.0 */
#define EXIF_TYPE_DOUBLE 12 /* TIFF 6.0 */
#define EXIF_TYPE_IFD 13
#define EXIF_TYPE_UNICODE 14
#define EXIF_TYPE_COMPLEX 15
#define EXIF_TYPE_LONG8 16 /* BigTIFF */
#define EXIF_TYPE_SLONG8 17 /* BigTIFF */
#define EXIF_TYPE_IFD8 18 /* BigTIFF */
#define BYTE_TYPE(a) ( (a==EXIF_TYPE_BYTE) || (a==EXIF_TYPE_ASCII) || (a==EXIF_TYPE_SBYTE) || (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_COMPRESSION 0x0103 // Compression, 1 => uncompressed, 6 => JPEG compression
#define IFD1_TAG_STRIP_OFFS 0x0111 // StripOffsets
#define IFD1_TAG_STRIP_BYTE_COUNTS 0x0117 // StripByteCounts
#define IFD1_TAG_JPEG_OFFS 0x0201 // JPEGInterchangeFormat
#define IFD1_TAG_JPEG_SIZE 0x0202 // JPEGInterchangeFormatLength
#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
// for debug only
void
ExifFormat::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);
}
}
uint16_t
ExifFormat::exif_type_size(const uint16_t type)
{
uint16_t size;
switch (type) {
case EXIF_TYPE_BYTE:
case EXIF_TYPE_ASCII:
case EXIF_TYPE_SBYTE:
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_COMPLEX:
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;
}
QString
ExifFormat::exif_time_str(const QDateTime& time)
{
QString str = time.toString(u"yyyy/MM/dd hh:mm:ss t");
if (time.timeSpec() != Qt::UTC) {
str.append(" (");
str.append(time.toUTC().toString(u"yyyy/MM/dd hh:mm:ss t"));
str.append(")");
}
return str;
}
QByteArray
ExifFormat::exif_read_str(ExifTag* tag)
{
// Panasonic DMC-TZ10 stores datum with trailing spaces.
// Kodak stores zero count ASCII tags.
QByteArray buf = (tag->count == 0) ? QByteArray("") : tag->data.at(0).toByteArray();
// If the bytearray contains internal NULL(s), get rid of the first and
// anything after it.
if (auto idx = buf.indexOf('\0'); idx >= 0) {
buf = buf.left(idx);
}
while ((buf.size() > 0) && isspace(buf.back())) {
buf.chop(1);
}
return buf;
}
double
ExifFormat::exif_read_double(const ExifTag* tag, const int index)
{
if (tag->type == EXIF_TYPE_RAT) {
auto num = tag->data.at(index * 2).value<uint32_t>();
auto den = tag->data.at((index * 2) + 1).value<uint32_t>();
return (double)num / (double)den;
} else { // EXIF_TYPE_SRAT
auto num = tag->data.at(index * 2).value<int32_t>();
auto den = tag->data.at((index * 2) + 1).value<int32_t>();
return (double)num / (double)den;
}
}
double
ExifFormat::exif_read_coord(const ExifTag* tag)
{
double res = exif_read_double(tag, 0);
if (tag->count == 1) {
return res;
}
double min = exif_read_double(tag, 1);
res += (min / 60);
if (tag->count == 2) {
return res;
}
double sec = exif_read_double(tag, 2);
res += (sec / 3600);
return res;
}
QTime
ExifFormat::exif_read_timestamp(const ExifTag* tag)
{
double hour = exif_read_double(tag, 0);
double min = exif_read_double(tag, 1);
double sec = exif_read_double(tag, 2);
return QTime(0, 0).addMSecs(lround((((hour * 60.0) + min) * 60.0 + sec) * 1000.0));
}
QDate
ExifFormat::exif_read_datestamp(const ExifTag* tag)
{
return QDate::fromString(tag->data.at(0).toByteArray().constData(), u"yyyy:MM:dd");
}
void
ExifFormat::exif_release_apps()
{
for (auto* app : std::as_const(*exif_apps)) {
if (app->fcache) {
gbfclose(app->fcache);
}
if (app->fexif) {
gbfclose(app->fexif);
}
delete app;
}
delete exif_apps;
exif_apps = nullptr;
}
uint32_t
ExifFormat::exif_ifd_size(ExifIfd* ifd)
{
uint32_t res = 6; /* nr of tags + next_ifd */
res += (ifd->count * 12);
for (auto& tag_instance : ifd->tags) {
ExifTag* tag = &tag_instance;
if (tag->size > 4) {
uint32_t size = tag->size;
if (size & 1u) {
size++;
}
res += size;
}
}
return res;
}
ExifFormat::ExifApp*
ExifFormat::exif_load_apps()
{
exif_app_ = nullptr;
while (! gbfeof(fin_)) {
exif_apps->append(new ExifApp);
ExifApp* app = exif_apps->last();
app->fcache = gbfopen(nullptr, "wb", MYNAME);
app->marker = gbfgetuint16(fin_);
app->len = gbfgetuint16(fin_);
if (global_opts.debug_level >= 3) {
printf(MYNAME ": api = %02X, len = %u (0x%04x), offs = 0x%08X\n", app->marker & 0xFF, app->len, app->len, gbftell(fin_));
}
if (exif_app_ || (app->marker == 0xFFDA)) { /* compressed data */
gbfcopyfrom(app->fcache, fin_, 0x7FFFFFFF);
if (global_opts.debug_level >= 3) {
printf(MYNAME ": compressed data size = %u\n", gbftell(app->fcache));
}
} else {
gbfcopyfrom(app->fcache, fin_, app->len - 2);
if (app->marker == 0xFFE1) {
exif_app_ = app;
}
}
}
return exif_app_;
}
#ifndef NDEBUG
void
ExifFormat::exif_validate_tag_structure(const ExifTag* tag)
{
// The count times the element size should match the saved size.
assert((tag->count * exif_type_size(tag->type)) == tag->size);
// for BYTE_TYPE we store a QByteArray as the only component of the QVector,
// and the count should match the size of the byte array.
assert((!BYTE_TYPE(tag->type)) ||
((tag->data.size() == 0) && (tag->count == 0)) ||
((tag->data.size() == 1) && (static_cast<unsigned>(tag->data.at(0).toByteArray().size()) == tag->count)));
// EXIF_TYPE_RAT and EXIF_TYPE_SRAT are stored as two values per item.
assert(((tag->type != EXIF_TYPE_RAT) && (tag->type != EXIF_TYPE_SRAT)) ||
(static_cast<unsigned>(tag->data.size()) == (2 * tag->count)));
// types other that BYTE_TYPE, RAT, SRAT are stored as one value per item.
assert(BYTE_TYPE(tag->type) || (tag->type == EXIF_TYPE_RAT) || (tag->type == EXIF_TYPE_SRAT) ||
(static_cast<unsigned>(tag->data.size()) == tag->count));
// For EXIF_TYPE_ASCII the last byte of the value must be NUL (binary 0).
assert((tag->type != EXIF_TYPE_ASCII) ||
((tag->data.size() == 0) && (tag->count == 0)) ||
((tag->data.size() == 1) && (tag->data.at(0).toByteArray().endsWith('\0'))));
}
#endif
ExifFormat::ExifIfd*
ExifFormat::exif_read_ifd(ExifApp* app, const uint16_t ifd_nr, const gbsize_t offs,
uint32_t* exif_ifd_ofs, uint32_t* gps_ifd_ofs, uint32_t* inter_ifd_ofs)
{
gbfile* fin = app->fexif;
app->ifds.append(ExifIfd());
ExifIfd* ifd = &app->ifds.last();
ifd->nr = ifd_nr;
gbfseek(fin, offs, SEEK_SET);
ifd->count = gbfgetuint16(fin);
if (global_opts.debug_level >= 3) {
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);
}
if (ifd->count == 0) {
return ifd;
}
for (uint16_t i = 0; i < ifd->count; i++) {
ifd->tags.append(ExifTag());
ExifTag* tag = &ifd->tags.last();
if (global_opts.debug_level >= 3) {
tag->tag_offset = gbftell(fin);
}
tag->id = gbfgetuint16(fin);
tag->type = gbfgetuint16(fin);
tag->count = gbfgetuint32(fin);
tag->size = exif_type_size(tag->type) * tag->count;
if (tag->size <= 4) { // data is in value offset field
if (BYTE_TYPE(tag->type)) {
assert(tag->count <= 4);
if (tag->count > 0) {
QByteArray qba(tag->count, 0);
gbfread(qba.data(), tag->count, 1, fin);
tag->data.append(qba);
}
} else if (WORD_TYPE(tag->type)) {
assert(tag->count <= 2);
for (unsigned idx=0; idx < tag->count; ++idx) {
tag->data.append(gbfgetuint16(fin));
}
} else if (LONG_TYPE(tag->type)) {
assert(tag->count <= 1);
if (tag->count == 1) {
tag->data.append(gbfgetuint32(fin));
}
} else if (tag->type == EXIF_TYPE_FLOAT) {
assert(tag->count <= 1);
if (tag->count == 1) {
tag->data.append(gbfgetflt(fin));
}
} else {
fatal(MYNAME "Unknown type %d has size <= 4! Please report.\n", tag->type);
}
int skip_bytes = 4 - tag->size;
if (skip_bytes > 0) {
gbfseek(fin, skip_bytes, SEEK_CUR);
}
if (global_opts.debug_level >= 3) {
gbfseek(fin, -4, SEEK_CUR);
gbfread(tag->raw, 4, 1, fin);
}
} else { // offset is in value offset field
tag->offset = gbfgetuint32(fin);
}
if (ifd_nr == IFD0) {
if (tag->id == IFD0_TAG_EXIF_IFD_OFFS) {
*exif_ifd_ofs = tag->toLong();
} else if (tag->id == IFD0_TAG_GPS_IFD_OFFS) {
*gps_ifd_ofs = tag->toLong();
}
} else if (ifd_nr == EXIF_IFD) {
if (tag->id == EXIF_IFD_TAG_INTER_IFD_OFFS) {
*inter_ifd_ofs = tag->toLong();
}
}
}
gbsize_t next_ifd_offs;
if (global_opts.debug_level >= 3) {
next_ifd_offs = gbftell(fin);
}
ifd->next_ifd = gbfgetuint32(fin);
for (auto& tag_instance : ifd->tags) {
ExifTag* tag = &tag_instance;
if ((tag->size > 4) && (tag->offset)) {
gbfseek(fin, tag->offset, SEEK_SET);
if (BYTE_TYPE(tag->type)) {
QByteArray qba(tag->count, 0);
gbfread(qba.data(), tag->count, 1, fin);
tag->data.append(qba);
} else for (unsigned i = 0; i < tag->count; i++) {
switch (tag->type) {
case EXIF_TYPE_SHORT:
case EXIF_TYPE_SSHORT:
tag->data.append(gbfgetuint16(fin));
break;
case EXIF_TYPE_IFD:
case EXIF_TYPE_LONG:
case EXIF_TYPE_SLONG:
tag->data.append(gbfgetuint32(fin));
break;
case EXIF_TYPE_RAT:
case EXIF_TYPE_SRAT:
tag->data.append(gbfgetuint32(fin));
tag->data.append(gbfgetuint32(fin));
break;
case EXIF_TYPE_FLOAT:
tag->data.append(gbfgetflt(fin));
break;
case EXIF_TYPE_DOUBLE:
tag->data.append(gbfgetdbl(fin));
break;
default: {
// We know the size for this tag type, but not the layout.
// Save it is a byte array we can echo on write.
QByteArray qba(tag->count, 0);
gbfread(qba.data(), exif_type_size(tag->type), 1, fin);
tag->data.append(qba);
}
break;
}
}
}
if (global_opts.debug_level >= 3) {
printf(MYNAME "-offs 0x%08X: ifd=%d id=0x%04X t=0x%04X c=%4u s=%4u",
tag->tag_offset, ifd->nr, tag->id, tag->type, tag->count, tag->size);
if (tag->size > 4) {
printf(" o=0x%08X", tag->offset);
} else {
printf(" v=0x%02X%02X%02X%02X", tag->raw[0], tag->raw[1], tag->raw[2], tag->raw[3]);
}
if (tag->type == EXIF_TYPE_ASCII) {
QByteArray str = exif_read_str(tag);
printf(" \"%s\"", str.constData());
} else {
for (unsigned idx = 0; idx < std::min(tag->count, 4u); ++idx) {
if (tag->type == EXIF_TYPE_BYTE) {
printf(" %u", tag->data.at(0).toByteArray().at(idx));
} else if (tag->type == EXIF_TYPE_SBYTE) {
printf(" %d", tag->data.at(0).toByteArray().at(idx));
} else if (tag->type == EXIF_TYPE_UNK) {
printf(" 0x%02X", tag->data.at(0).toByteArray().at(idx));
} else if (tag->type == EXIF_TYPE_RAT) {
printf(" %+#g(%u/%u)", exif_read_double(tag, idx), tag->data.at(idx * 2).value<uint32_t>(), tag->data.at((idx * 2) + 1).value<uint32_t>());
} else if (tag->type == EXIF_TYPE_SRAT) {
printf(" %+#g(%d/%d)", exif_read_double(tag, idx), tag->data.at(idx * 2).value<int32_t>(), tag->data.at((idx * 2) + 1).value<int32_t>());
} else if (tag->type == EXIF_TYPE_SHORT) {
printf(" %u", tag->data.at(idx).value<uint16_t>());
} else if (tag->type == EXIF_TYPE_SSHORT) {
printf(" %d", tag->data.at(idx).value<int16_t>());
} else if (tag->type == EXIF_TYPE_LONG) {
printf(" %u", tag->data.at(idx).value<uint32_t>());
} else if (tag->type == EXIF_TYPE_SLONG) {
printf(" %d", tag->data.at(idx).value<int32_t>());
} else if (tag->type == EXIF_TYPE_FLOAT) {
printf(" %+#g", tag->data.at(idx).value<float>());
} else if (tag->type == EXIF_TYPE_DOUBLE) {
printf(" %+#g", tag->data.at(idx).value<double>());
} else {
printf(" 0x%0*X", 2 * exif_type_size(tag->type), tag->data.at(idx).value<uint32_t>());
}
}
if (tag->count > 4) {
printf(" ...");
}
}
printf("\n");
}
#ifndef NDEBUG
exif_validate_tag_structure(tag);
#endif
}
if (global_opts.debug_level >= 3) {
printf(MYNAME "-offs 0x%08X: Next IFD=0x%08X\n", next_ifd_offs, ifd->next_ifd);
}
return ifd;
}
void
ExifFormat::exif_read_app(ExifApp* app)
{
gbsize_t offs;
uint32_t exif_ifd_ofs;
uint32_t gps_ifd_ofs;
uint32_t inter_ifd_ofs;
ExifIfd* ifd;
gbfile* fin = app->fexif;
if (global_opts.debug_level >= 3) {
printf(MYNAME ": read_app...\n");
print_buff((const char*)fin->handle.mem, 8, MYNAME "-offs 0x00000000: Image File Header");
printf("\n");
}
exif_ifd_ofs = gps_ifd_ofs = inter_ifd_ofs = 0;
gbfseek(fin, 4, SEEK_SET);
offs = gbfgetuint32(fin); // Image File Header Bytes 4-7, the offset (in bytes) of the first IFD.
ifd = exif_read_ifd(app, IFD0, offs, &exif_ifd_ofs, &gps_ifd_ofs, &inter_ifd_ofs);
if (ifd == nullptr) {
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, nullptr, nullptr, &inter_ifd_ofs);
}
if (gps_ifd_ofs) {
ifd = exif_read_ifd(app, 3, gps_ifd_ofs, nullptr, nullptr, nullptr);
}
if (inter_ifd_ofs) {
ifd = exif_read_ifd(app, 4, inter_ifd_ofs, nullptr, nullptr, nullptr);
}
// The return values of exif_read_ifd above aren't actually used.
// Warning hush.
(void) ifd;
}
void
ExifFormat::exif_examine_app(ExifApp* app)
{
gbfile* ftmp = app->fcache;
gbfrewind(ftmp);
uint32_t ident = gbfgetuint32(ftmp);
if (ident != 0x66697845) {
fatal(MYNAME ": Invalid EXIF header magic.");
}
if (gbfgetint16(ftmp) != 0) {
fatal(MYNAME ": Error in EXIF header.");
}
uint16_t endianness = gbfgetint16(ftmp);
if (global_opts.debug_level >= 3) {
printf(MYNAME ": endianness = 0x%04X\n", endianness);
}
if (endianness == 0x4949) {
ftmp->big_endian = 0;
} else if (endianness == 0x4D4D) {
ftmp->big_endian = 1;
} else {
fatal(MYNAME ": Invalid endianness identifier 0x%04X!\n", endianness);
}
gbfseek(ftmp, 6, SEEK_SET);
app->fexif = gbfopen(nullptr, "wb", MYNAME);
app->fexif->big_endian = ftmp->big_endian;
gbfcopyfrom(app->fexif, ftmp, 0x7FFFFFFF);
exif_read_app(app);
}
ExifFormat::ExifIfd*
ExifFormat::exif_find_ifd(ExifApp* app, const uint16_t ifd_nr)
{
for (auto& ifd_instance : app->ifds) {
ExifIfd* ifd = &ifd_instance;
if (ifd->nr == ifd_nr) {
return ifd;
}
}
return nullptr;
}
ExifFormat::ExifTag*
ExifFormat::exif_find_tag(ExifApp* app, const uint16_t ifd_nr, const uint16_t tag_id)
{
ExifIfd* ifd = exif_find_ifd(app, ifd_nr);
if (ifd != nullptr) {
for (auto& tag_instance : ifd->tags) {
ExifTag* tag = &tag_instance;
if (tag->id == tag_id) {
return tag;
}
}
}
return nullptr;
}
QDateTime
ExifFormat::exif_get_exif_time(ExifApp* app) const
{
QDateTime res;
ExifTag* 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) {
QByteArray str = exif_read_str(tag);
// This assumes the Qt::TimeSpec is Qt::LocalTime, i.e. the current system time zone.
// Note the assumption of local time can be problematic if the data
// is processed in a different time zone than was used in recording
// the time in the image.
res = QDateTime::fromString(str, u"yyyy:MM:dd hh:mm:ss");
// Exif 2.31 added offset tags to record the offset to UTC.
// If these are present use them, otherwise assume local time.
ExifTag* offset_tag = nullptr;
ExifTag* subsec_tag = nullptr;
switch (tag->id) {
case 0x9003:
offset_tag = exif_find_tag(app, EXIF_IFD, 0x9011); /* OffsetTimeOriginal from EXIF */
subsec_tag = exif_find_tag(app, EXIF_IFD, 0x9291); /* SubSecTimeOriginal from EXIF */
break;
case 0x0132:
offset_tag = exif_find_tag(app, EXIF_IFD, 0x9010); /* OffsetTime from EXIF */
subsec_tag = exif_find_tag(app, EXIF_IFD, 0x9290); /* SubSecTime from EXIF */
break;
case 0x9004:
offset_tag = exif_find_tag(app, EXIF_IFD, 0x9012); /* OffsetTimeDigitized from EXIF */
subsec_tag = exif_find_tag(app, EXIF_IFD, 0x9292); /* SubSecTimeDigitized from EXIF */
break;
}
if (offset_tag || opt_offsettime) {
QByteArray time_tag = opt_offsettime? QByteArray(opt_offsettime) : exif_read_str(offset_tag);
// string should be +HH:MM or -HH:MM
static const QRegularExpression re(R"(^([+-])(\d{2}):(\d{2})$)");
assert(re.isValid());
QRegularExpressionMatch match = re.match(time_tag);
if (match.hasMatch()) {
// Correct the date time by supplying the offset from UTC.
int offset_hours = match.captured(1).append(match.captured(2)).toInt();
int offset_mins = match.captured(1).append(match.captured(3)).toInt();
#ifdef LIGHTWEIGHT_TIMEZONES_SUPPORTED
res.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(((offset_hours * 60) + offset_mins) * 60));
#else
res.setOffsetFromUtc(((offset_hours * 60) + offset_mins) * 60);
#endif
} else if (opt_offsettime) {
// Only warn for user supplied offsets.
// Offset tags may indicate the offset was unknown, e.g. " : ".
warning(MYNAME ": OffsetTime is expected to be +HH:MM or -HH:MM, but was %s.\n", time_tag.constData());
}
}
if (subsec_tag) {
QByteArray subsec = exif_read_str(subsec_tag);
bool ok;
double ss = subsec.prepend("0.").toDouble(&ok);
if (ok) {
res = res.addMSecs(lround(1000.0 * ss));
}
}
}
return res.toUTC();
}
Waypoint*
ExifFormat::exif_waypt_from_exif_app(ExifApp* app) const
{
ExifTag* tag;
char lat_ref = '\0';
char lon_ref = '\0';
char alt_ref = 0;
char speed_ref = 'K';
QByteArray datum;
char mode = '\0';
double gpsdop = unknown_alt;
double alt = unknown_alt;
QTime timestamp;
QDate datestamp;
QDateTime gps_datetime;
ExifIfd* ifd = exif_find_ifd(app, GPS_IFD);
if (ifd == nullptr) {
return nullptr;
}
auto* wpt = new Waypoint;
wpt->latitude = unknown_alt;
wpt->longitude = unknown_alt;
for (auto& tag_instance : ifd->tags) {
tag = &tag_instance;
switch (tag->id) {
case GPS_IFD_TAG_VERSION:
break;
case GPS_IFD_TAG_LATREF:
lat_ref = tag->data.at(0).toByteArray().at(0);
break;
case GPS_IFD_TAG_LAT:
wpt->latitude = exif_read_coord(tag);
break;
case GPS_IFD_TAG_LONREF:
lon_ref = tag->data.at(0).toByteArray().at(0);
break;
case GPS_IFD_TAG_LON:
wpt->longitude = exif_read_coord(tag);
break;
case GPS_IFD_TAG_ALTREF:
alt_ref = tag->data.at(0).toByteArray().at(0);
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 = tag->data.at(0).toByteArray().toInt();
break;
case GPS_IFD_TAG_MODE:
mode = tag->data.at(0).toByteArray().at(0);
break;
case GPS_IFD_TAG_DOP:
gpsdop = exif_read_double(tag, 0);
break;
case GPS_IFD_TAG_SPEEDREF:
speed_ref = tag->data.at(0).toByteArray().at(0);
break;
case GPS_IFD_TAG_SPEED:
wpt->set_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(ast).\n");
}
if (global_opts.debug_level >= 3) {
printf(MYNAME "-GPSLatitude = %12.7f\n", wpt->latitude);
printf(MYNAME "-GPSLongitude = %12.7f\n", wpt->longitude);
}
if (!datum.isEmpty()) {
int idatum = gt_lookup_datum_index(datum, MYNAME);
if (idatum < 0) {
fatal(MYNAME ": Unknown GPSMapDatum \"%s\"!\n", datum.constData());
}
if (idatum != kDatumWGS84) {
GPS_Math_WGS84_To_Known_Datum_M(wpt->latitude, wpt->longitude, 0.0,
&wpt->latitude, &wpt->longitude, &alt, idatum);
}
}
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;
if (global_opts.debug_level >= 3) {
printf(MYNAME "-GPSAltitude = %12.7f m\n", wpt->altitude);
}
}
if (wpt->speed_has_value()) {
switch (speed_ref) {
case 'K':
wpt->set_speed(KPH_TO_MPS(wpt->speed_value()));
break;
case 'M':
wpt->set_speed(MPH_TO_MPS(wpt->speed_value()));
break;
case 'N':
wpt->set_speed(KNOTS_TO_MPS(wpt->speed_value()));
break;
default:
wpt->reset_speed();
warning(MYNAME ": Unknown GPSSpeedRef unit %c (0x%02x)!\n", speed_ref, speed_ref);
}
if (global_opts.debug_level >= 3) {
if (wpt->speed_has_value()) {
printf(MYNAME "-GPSSpeed = %12.2f m/s\n", wpt->speed_value());
}
}
}
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;
}
}
gps_datetime = QDateTime(datestamp, timestamp, QtUTC);
if (gps_datetime.isValid()) {
if (global_opts.debug_level >= 3) {
printf(MYNAME "-GPSTimeStamp = %s\n", qPrintable(gps_datetime.toString(Qt::ISODateWithMs)));
}
wpt->SetCreationTime(gps_datetime);
} 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)) {
// TODO: User comments with JIS and Undefined Code Designations are ignored.
if (memcmp(tag->data.at(0).toByteArray().constData(), "ASCII\0\0\0", 8) == 0) {
wpt->notes = QString::fromLatin1(tag->data.at(0).toByteArray().constData() + 8, tag->size - 8);
} else if (memcmp(tag->data.at(0).toByteArray().constData(), "UNICODE\0", 8) == 0) {
QTextCodec* utf16_codec;
if (app->fcache->big_endian) {
utf16_codec = QTextCodec::codecForName("UTF-16BE");
} else {
utf16_codec = QTextCodec::codecForName("UTF-16LE");
}
wpt->notes = utf16_codec->toUnicode(tag->data.at(0).toByteArray().constData() + 8, tag->size - 8);
}
}
if (opt_filename) {
QFileInfo fi(fin_->name);
// No directory, no extension.
wpt->shortname = fi.baseName();
}
return wpt;
}
// TODO: we could achieve an increased domain and accuracy for TIFF RATIONAL
// types if we handled them separately (int32_t -> uint32_t, INT32_MAX -> UINT32_MAX).
ExifFormat::Rational<int32_t> ExifFormat::exif_dec2frac(double val, double tolerance = DBL_EPSILON)
{
constexpr double upper_limit = INT32_MAX;
constexpr double lower_limit = 1.0/upper_limit;
const double pval = fabs(val);
const double tol = fmax(tolerance, DBL_EPSILON);
if (pval < lower_limit) {
return Rational<int32_t>(0, upper_limit);
} else if (pval > upper_limit) {
fatal(MYNAME ": Value (%f) to big for a rational representation!\n", val);
return Rational<int32_t>(copysign(upper_limit, val), 1);
}
double b;
double remainder = modf(pval, &b);
Rational<double> prev_prev(1.0, 0.0);
Rational<double> prev(b, 1.0);
Rational<double> curr = prev;
// phi = (1.0+sqrt(5.0))/2.0 is badly approximable and the slowest to converge.
// This is a good test case to see the maximum number of iterations required.
for (int idx = 0; idx < 64; ++idx) {
// Calculate the next simple continued fraction coefficient (b), and remainder (remainder).
if (remainder < lower_limit) {
break; // remainder is nearly zero, use current estimate.
}
remainder = modf(1.0/remainder, &b);
// Convert the truncated simple continued fraction, a.k.a. a convergent, to an ordinary fraction (curr.num/curr.den).
Rational<double> candidate((b * prev.num) + prev_prev.num, (b * prev.den) + prev_prev.den);
if (candidate.num > upper_limit) {
break; // numerator too big, use current estimate.
}
if (candidate.den > upper_limit) {
break; // denominator too big, use current estimate.
}
curr = candidate;
if (fabs(pval- (curr.num/curr.den)) < (pval * tol)) {
break; // close enough, use current estimate.
}