mirror of
https://github.com/openharmony/third_party_libexif.git
synced 2026-08-27 23:20:22 -04:00
duanhan
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/** \file test-extract.c
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* \brief Extract EXIF data from a file and write it to another file.
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*
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* Copyright (C) 2019 Dan Fandrich <dan@coneharvesters.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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* SPDX-License-Identifier: LGPL-2.0-or-later
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*/
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#include "libexif/exif-data.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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static const unsigned char header[4] = {'\xff', '\xd8', '\xff', '\xe1'};
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int main(const int argc, const char *argv[])
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{
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int first = 1;
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const char *fn = "input.jpg";
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const char *outfn = "output.exif";
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ExifData *d;
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unsigned char *buf;
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unsigned int len;
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FILE *f;
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unsigned char lenbuf[2];
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if (argc > 1 && !strcmp(argv[1], "-o")) {
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outfn = argv[2];
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first += 2;
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}
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if (argc > first) {
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fn = argv[first];
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++first;
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}
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if (argc > first) {
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fprintf (stderr, "Too many arguments\n");
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return 1;
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}
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d = exif_data_new_from_file(fn);
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if (!d) {
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fprintf (stderr, "Could not load data from '%s'!\n", fn);
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return 1;
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}
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exif_data_save_data(d, &buf, &len);
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exif_data_unref(d);
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if (!buf) {
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fprintf (stderr, "Could not extract EXIF data!\n");
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return 2;
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}
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f = fopen(outfn, "wb");
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if (!f) {
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fprintf (stderr, "Could not open '%s' for writing!\n", outfn);
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return 1;
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}
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/* Write EXIF with headers and length. */
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if (fwrite(header, 1, sizeof(header), f) != sizeof(header)) {
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fprintf (stderr, "Could not write to '%s'!\n", outfn);
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return 3;
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}
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/*
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* FIXME: The buffer from exif_data_save_data() seems to contain extra 0xffd8
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* 0xffd9 JPEG markers at the end that I wasn't expecting, making the length
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* seem too long. Should those markers really be included?
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*/
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exif_set_short(lenbuf, EXIF_BYTE_ORDER_MOTOROLA, len);
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if (fwrite(lenbuf, 1, 2, f) != 2) {
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fprintf (stderr, "Could not write to '%s'!\n", outfn);
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return 3;
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}
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if (fwrite(buf, 1, len, f) != len) {
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fprintf (stderr, "Could not write to '%s'!\n", outfn);
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return 3;
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}
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if (fclose(f) != 0) {
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fprintf (stderr, "Could not close '%s'!\n", outfn);
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return 3;
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}
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free(buf);
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fprintf (stderr, "Wrote EXIF data to '%s'\n", outfn);
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return 0;
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}
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