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1
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#include <exiv2/exiv2.hpp>
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2
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3
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#include <iostream>
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4
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#include <iomanip>
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5
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#include <cassert>
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6
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7
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int main(int argc, char* const argv[])
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8
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{
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9
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if (argc != 2) {
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10
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std::cout << "Usage: " << argv[0] << " file\n";
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11
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return 1;
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12
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}
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13
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14
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Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(argv[1]);
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15
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assert(image.get() != 0);
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16
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image->readMetadata();
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17
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18
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Exiv2::ExifData exifData = image->exifData();
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19
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20
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if (exifData.empty()) {
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21
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std::cerr << "exif data is empty\n";
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22
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exifData = Exiv2::ExifData();
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23
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}
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24
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25
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bool isTiff = (image->mimeType() == "image/tiff");
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26
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27
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// ok, let's try to save the thumbnail...
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28
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try {
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29
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30
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Exiv2::ExifThumb eThumb(exifData);
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31
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32
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if (isTiff) {
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33
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eThumb.erase();
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34
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35
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Exiv2::ExifData::const_iterator pos = exifData.findKey(Exiv2::ExifKey("Exif.Image.NewSubfileType"));
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36
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if (pos == exifData.end() || pos->count() != 1 || pos->toLong() != 0) {
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37
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throw Exiv2::Error(1, "Exif.Image.NewSubfileType missing or not set as main image");
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38
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}
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39
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std::string subImage1("SubImage1");
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40
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for (Exiv2::ExifData::iterator md = exifData.begin(); md != exifData.end();)
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41
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{
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42
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if (md->groupName() == subImage1)
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md = exifData.erase(md);
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44
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else
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++md;
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46
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}
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47
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}
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48
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49
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Exiv2::DataBuf buf(256);
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50
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memset(buf.pData_, 0x88, buf.size_);
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51
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52
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if (isTiff) {
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53
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Exiv2::ULongValue val;
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54
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val.read("0");
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55
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val.setDataArea(buf.pData_, buf.size_);
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56
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exifData["Exif.SubImage1.JPEGInterchangeFormat"] = val;
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57
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exifData["Exif.SubImage1.JPEGInterchangeFormatLength"] = uint32_t(buf.size_);
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58
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exifData["Exif.SubImage1.Compression"] = uint16_t(6); // JPEG (old-style)
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59
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exifData["Exif.SubImage1.NewSubfileType"] = uint32_t(1); // Thumbnail image
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60
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std::cerr << "As you told me to, I am writing the TIFF thumbs...\n";
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61
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62
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} else {
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63
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eThumb.setJpegThumbnail(buf.pData_, buf.size_);
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64
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std::cerr << "As you told me to, I am writing the JPEG thumbs...\n";
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65
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}
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66
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67
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image->setExifData(exifData);
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68
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image->writeMetadata();
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69
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}
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70
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catch (Exiv2::Error& e) {
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71
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std::cout << "Caught Exiv2 exception '" << e.what() << "'\n";
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72
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return -1;
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73
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}
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74
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75
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return 0;
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76
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}
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