/* Save an exif value to a string in a way that we can restore. We only bother
* for the simple formats (that a client might try to change) though.
*
* Keep in sync with vips_exif_from_s() below.
*/
static void
vips_exif_to_s( ExifData *ed, ExifEntry *entry, VipsBuf *buf )
{
unsigned long i;
int iv;
ExifRational rv;
ExifSRational srv;
char txt[256];
if( entry->format == EXIF_FORMAT_ASCII ) {
/* libexif does not null-terminate strings. Copy out and add
* the \0 ourselves.
*/
int len = VIPS_MIN( 254, entry->size );
memcpy( txt, entry->data, len );
txt[len] = '\0';
vips_buf_appendf( buf, "%s ", txt );
}
else if( entry->components < 10 &&
!vips_exif_get_int( ed, entry, 0, &iv ) ) {
for( i = 0; i < entry->components; i++ ) {
vips_exif_get_int( ed, entry, i, &iv );
vips_buf_appendf( buf, "%d ", iv );
}
}
else if( entry->components < 10 &&
!vips_exif_get_rational( ed, entry, 0, &rv ) ) {
for( i = 0; i < entry->components; i++ ) {
vips_exif_get_rational( ed, entry, i, &rv );
vips_buf_appendf( buf, "%u/%u ",
rv.numerator, rv.denominator );
}
}
else if( entry->components < 10 &&
!vips_exif_get_srational( ed, entry, 0, &srv ) ) {
for( i = 0; i < entry->components; i++ ) {
vips_exif_get_srational( ed, entry, i, &srv );
vips_buf_appendf( buf, "%d/%d ",
srv.numerator, srv.denominator );
}
}
else
vips_buf_appendf( buf, "%s ",
exif_entry_get_value( entry, txt, 256 ) );
vips_buf_appendf( buf, "(%s, %s, %lu components, %d bytes)",
exif_entry_get_value( entry, txt, 256 ),
exif_format_get_name( entry->format ),
entry->components,
entry->size );
}
/* Save an exif value to a string in a way that we can restore. We only bother
* for the simple formats (that a client might try to change) though.
*
* Keep in sync with vips_exif_from_s() in vips2jpeg.
*/
static void
vips_exif_to_s( ExifData *ed, ExifEntry *entry, VipsBuf *buf )
{
unsigned long i;
int iv;
ExifRational rv;
ExifSRational srv;
char txt[256];
if( entry->format == EXIF_FORMAT_ASCII )
vips_buf_appendf( buf, "%s ", entry->data );
else if( entry->components < 10 &&
!vips_exif_get_int( ed, entry, 0, &iv ) ) {
for( i = 0; i < entry->components; i++ ) {
vips_exif_get_int( ed, entry, i, &iv );
vips_buf_appendf( buf, "%d ", iv );
}
}
else if( entry->components < 10 &&
!vips_exif_get_rational( ed, entry, 0, &rv ) ) {
for( i = 0; i < entry->components; i++ ) {
vips_exif_get_rational( ed, entry, i, &rv );
vips_buf_appendf( buf, "%u/%u ",
rv.numerator, rv.denominator );
}
}
else if( entry->components < 10 &&
!vips_exif_get_srational( ed, entry, 0, &srv ) ) {
for( i = 0; i < entry->components; i++ ) {
vips_exif_get_srational( ed, entry, i, &srv );
vips_buf_appendf( buf, "%d/%d ",
srv.numerator, srv.denominator );
}
}
else
vips_buf_appendf( buf, "%s ",
exif_entry_get_value( entry, txt, 256 ) );
vips_buf_appendf( buf, "(%s, %s, %lu components, %d bytes)",
exif_entry_get_value( entry, txt, 256 ),
exif_format_get_name( entry->format ),
entry->components,
entry->size );
}
static int
vips_exif_entry_get_int( ExifData *ed, int ifd, ExifTag tag, int *out )
{
ExifEntry *entry;
if( !(entry = exif_content_get_entry( ed->ifd[ifd], tag )) ||
entry->components != 1 )
return( -1 );
return( vips_exif_get_int( ed, entry, 0, out ) );
}
