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66 lines
1.8 KiB
66 lines
1.8 KiB
4 months ago
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#include <libexif/exif-data.h>
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#include <libexif/exif-loader.h>
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#include <stddef.h>
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#include <stdlib.h>
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/* Extract all MakerNote tags */
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static void mnote_dump(ExifData *data) {
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ExifMnoteData *mn = exif_data_get_mnote_data(data);
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if (mn) {
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int num = exif_mnote_data_count(mn);
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/* Loop through all MakerNote tags */
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for (int i = 0; i < num; ++i) {
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char buf[1024];
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exif_mnote_data_get_value(mn, i, buf, sizeof(buf));
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}
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}
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}
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static void dump_value(ExifEntry *entry, void *) {
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char buf[1024];
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exif_entry_get_value(entry, buf, sizeof(buf));
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}
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static void data_func(ExifContent *content, void *) {
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exif_content_foreach_entry(content, dump_value, NULL);
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}
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/* This is like exif_data_dump but without writing to stdout */
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static void data_dump(ExifData *data) {
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exif_data_foreach_content(data, data_func, NULL);
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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// Parse tags using (ultimately) exif_data_load_data()
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auto image = exif_data_new_from_data(data, size);
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if (image) {
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// Exercise the EXIF tag manipulation code
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exif_data_get_mnote_data(image);
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data_dump(image);
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mnote_dump(image);
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unsigned char *buf;
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unsigned int sz;
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exif_data_save_data(image, &buf, &sz);
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free(buf);
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exif_data_fix(image);
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exif_data_unref(image);
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}
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// Parse tags again, but using exif_loader_write(), which is a separate
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// parser. There is no need to fuzz the parsed ExifData again, since it will
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// be identical to what has been loaded (and fuzzed) above.
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ExifLoader *loader = exif_loader_new();
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if (!loader) {
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return 0;
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}
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exif_loader_write(loader, const_cast<unsigned char *>(data), size);
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image = exif_loader_get_data(loader);
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if (image) {
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exif_data_unref(image);
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}
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exif_loader_unref(loader);
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return 0;
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}
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