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/* mnote-apple-entry.c
*
* Copyright (c) 2018 zhanwang-sky <[email protected]>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include "mnote-apple-entry.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libexif/exif-entry.h>
#include <libexif/exif-format.h>
#include <libexif/exif-utils.h>
#include <libexif/i18n.h>
char *
mnote_apple_entry_get_value(MnoteAppleEntry *entry, char *v, unsigned int maxlen) {
ExifLong vl;
ExifSLong vsl;
ExifShort vs;
ExifSShort vss;
ExifRational vr;
ExifSRational vsr;
size_t size;
unsigned char *data;
if (!entry)
return NULL;
memset(v, 0, maxlen);
maxlen--;
size = entry->size;
data = entry->data;
switch (entry->tag) {
case MNOTE_APPLE_TAG_HDR:
if (size < 4) return NULL;
if (entry->format != EXIF_FORMAT_SLONG) return NULL;
if (entry->components != 1) return NULL;
vsl = exif_get_slong(data, entry->order);
snprintf(v, maxlen, "%d", vsl);
break;
case MNOTE_APPLE_TAG_IMAGE_UNIQUE_ID:
case MNOTE_APPLE_TAG_BURST_UUID:
case MNOTE_APPLE_TAG_MEDIA_GROUP_UUID:
if (entry->format != EXIF_FORMAT_ASCII) return NULL;
strncpy (v, (char *) data, MIN (maxlen-1, size));
v[MIN (maxlen-1, size)] = 0;
break;
default:
switch (entry->format) {
case EXIF_FORMAT_ASCII:
strncpy (v, (char *)data, MIN(maxlen, size));
break;
case EXIF_FORMAT_SHORT: {
size_t i, len = 0;
for(i=0; i<entry->components; i++) {
if (size < 2)
break;
if (len > maxlen)
break;
vs = exif_get_short (data, entry->order);
snprintf (v+len, maxlen-len, "%hu ", vs);
len = strlen(v);
data += 2;
size -= 2;
}
}
break;
case EXIF_FORMAT_SSHORT: {
size_t i, len = 0;
for(i=0; i<entry->components; i++) {
if (size < 2)
break;
if (len > maxlen)
break;
vss = exif_get_sshort (data, entry->order);
snprintf (v+len, maxlen-len, "%hi ", vss);
len = strlen(v);
data += 2;
size -= 2;
}
}
break;
case EXIF_FORMAT_LONG: {
size_t i, len = 0;
for(i=0; i<entry->components; i++) {
if (size < 4)
break;
if (len > maxlen)
break;
vl = exif_get_long (data, entry->order);
snprintf (v+len, maxlen-len, "%lu ", (long unsigned) vl);
len = strlen(v);
data += 4;
size -= 4;
}
}
break;
case EXIF_FORMAT_SLONG: {
size_t i, len = 0;
for(i=0; i<entry->components; i++) {
if (size < 4)
break;
if (len > maxlen)
break;
vsl = exif_get_slong (data, entry->order);
snprintf (v+len, maxlen-len, "%li ", (long int) vsl);
len = strlen(v);
data += 4;
size -= 4;
}
}
break;
case EXIF_FORMAT_RATIONAL:
vr = exif_get_rational (data, entry->order);
if (!vr.denominator) break;
snprintf (v, maxlen, "%2.4f", (double) vr.numerator /
vr.denominator);
break;
case EXIF_FORMAT_SRATIONAL:
vsr = exif_get_srational (data, entry->order);
if (!vsr.denominator) break;
snprintf (v, maxlen, "%2.4f", (double) vsr.numerator /
vsr.denominator);
break;
case EXIF_FORMAT_UNDEFINED:
default:
snprintf (v, maxlen, _("%i bytes unknown data"), entry->size);
break;
}
break;
}
return v;
}
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