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/*
This file is part of darktable,
2014 Edouard Gomez
Copyright (C) 2025 darktable developers.
darktable 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 3 of the License, or
(at your option) any later version.
darktable 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 darktable. If not, see <http://www.gnu.org/licenses/>.
*/
// avoid error reported when including exiv2.hpp on macOS (XCode 15.2)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#include <exiv2/exif.hpp>
#include <exiv2/error.hpp>
#include <exiv2/image.hpp>
#pragma GCC diagnostic pop
#include <cstdio>
#include <cassert>
using namespace std;
extern "C" int
exif_get_ascii_datafield(
const char* filename,
const char* key,
char* buf,
size_t buflen)
{
int ret = -1;
try
{
auto image = Exiv2::ImageFactory::open(filename);
assert(image.get() != 0);
image->readMetadata();
Exiv2::ExifData &exifData = image->exifData();
auto val = exifData[key].getValue();
if (val->typeId() != Exiv2::asciiString)
{
ret = -1;
goto exit;
}
if ((size_t)val->size() >= buflen)
{
ret = val->size()+1;
goto exit;
}
snprintf(buf, buflen, "%s", val->toString().c_str());
ret = 0;
}
catch (Exiv2::Error& e)
{
ret = -1;
}
exit:
return ret;
}
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