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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <libexif/exif-data.h>
#include <libexif/exif-loader.h>
#include <stddef.h>
#include <stdlib.h>
/* Extract all MakerNote tags */
static void mnote_dump(ExifData *data) {
ExifMnoteData *mn = exif_data_get_mnote_data(data);
if (mn) {
int num = exif_mnote_data_count(mn);
/* Loop through all MakerNote tags */
for (int i=0; i < num; ++i) {
char buf[1024];
exif_mnote_data_get_value(mn, i, buf, sizeof(buf));
}
}
}
static void dump_value(ExifEntry *entry, void *user_data) {
char buf[1024];
exif_entry_get_value(entry, buf, sizeof(buf));
}
static void data_func(ExifContent *content, void *user_data) {
exif_content_foreach_entry(content, dump_value, NULL);
}
/* This is like exif_data_dump but without writing to stdout */
static void data_dump(ExifData *data) {
exif_data_foreach_content(data, data_func, NULL);
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
// Parse tags using (ultimately) exif_data_load_data()
auto image = exif_data_new_from_data(data, size);
if (image) {
// Exercise the EXIF tag manipulation code
exif_data_get_mnote_data(image);
data_dump(image);
mnote_dump(image);
unsigned char *buf;
unsigned int sz;
exif_data_save_data(image, &buf, &sz);
free(buf);
exif_data_fix(image);
exif_data_unref(image);
}
return 0;
}
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