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ifd_enumerate: Properly handle unknown-type tags during the initial parse.

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This commit is contained in:
Dustin Oprea 2018-06-07 23:18:36 -04:00
parent cda05ba702
commit 4c3a9d79f1
1 changed files with 37 additions and 33 deletions
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16
ifd_enumerate.go
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@ -194,8 +194,14 @@ func (ie *IfdEnumerate) resolveTagValue(ite *IfdTagEntry) (valueBytes []byte, is
}
value, err := UndefinedValue(ite.Ii, ite.TagId, valueContext, ie.byteOrder)
log.PanicIf(err)
if err != nil {
if log.Is(err, ErrUnhandledUnknownTypedTag) == true {
valueBytes = []byte(UnparseableUnknownTagValuePlaceholder)
return valueBytes, true, nil
} else {
log.Panic(err)
}
} else {
switch value.(type) {
case []byte:
return value.([]byte), false, nil
@ -203,9 +209,6 @@ func (ie *IfdEnumerate) resolveTagValue(ite *IfdTagEntry) (valueBytes []byte, is
return []byte(value.(string)), false, nil
case UnknownTagValue:
valueBytes, err := value.(UnknownTagValue).ValueBytes()
// TODO(dustin): Is this always bytes? What about the tag-specific structures that are built? Handle unhandled unknown. Set isUnhandledUnknown.
log.PanicIf(err)
return valueBytes, false, nil
@ -214,7 +217,7 @@ func (ie *IfdEnumerate) resolveTagValue(ite *IfdTagEntry) (valueBytes []byte, is
log.Panicf("can not produce bytes for unknown-type tag (0x%04x): [%s]", ite.TagId, reflect.TypeOf(value))
}
}
} else {
originalType := NewTagType(ite.TagType, ie.byteOrder)
byteCount := uint32(originalType.Size()) * ite.UnitCount
@ -233,6 +236,7 @@ func (ie *IfdEnumerate) resolveTagValue(ite *IfdTagEntry) (valueBytes []byte, is
valueBytes, err = tt.ParseBytes(addressableData[ite.ValueOffset:], byteCount)
log.PanicIf(err)
}
}
return valueBytes, false, nil
}