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ifd_enumerate.go: Allow GPS version to not exist 

- Also, log when we're not processing GPS due to incompatible version.
pull/18/head
Dustin Oprea 2019-04-02 11:46:50 -04:00
parent 3f9a27433f
commit 4ff0938c41
1 changed files with 6 additions and 1 deletions
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7
ifd_enumerate.go
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@ -821,8 +821,11 @@ func (ifd *Ifd) GpsInfo() (gi *GpsInfo, err error) {
}
if tags, found := ifd.EntriesByTagId[TagVersionId]; found == false {
log.Panic(ErrNoGpsTags)
// We've seen this. We'll just have to default to assuming we're in a
// 2.2.0.0 format.
ifdEnumerateLogger.Warningf(nil, "No GPS version tag (0x%04x) found.", TagVersionId)
} else if bytes.Compare(tags[0].value, []byte{2, 2, 0, 0}) != 0 {
ifdEnumerateLogger.Errorf(nil, nil, "GPS version not supported: %v", tags[0].value)
log.Panic(ErrNoGpsTags)
}
@ -834,6 +837,7 @@ func (ifd *Ifd) GpsInfo() (gi *GpsInfo, err error) {
latitudeValue, err := ifd.TagValue(tags[0])
log.PanicIf(err)
// Look for whether North or South.
tags, found = ifd.EntriesByTagId[TagLatitudeRefId]
if found == false {
log.Panicf("latitude-ref not found")
@ -850,6 +854,7 @@ func (ifd *Ifd) GpsInfo() (gi *GpsInfo, err error) {
longitudeValue, err := ifd.TagValue(tags[0])
log.PanicIf(err)
// Look for whether West or East.
tags, found = ifd.EntriesByTagId[TagLongitudeRefId]
if found == false {
log.Panicf("longitude-ref not found")