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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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70
ifd_enumerate.go
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@ -194,44 +194,48 @@ func (ie *IfdEnumerate) resolveTagValue(ite *IfdTagEntry) (valueBytes []byte, is
} }
value, err := UndefinedValue(ite.Ii, ite.TagId, valueContext, ie.byteOrder) 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
case string:
return []byte(value.(string)), false, nil
case UnknownTagValue:
valueBytes, err := value.(UnknownTagValue).ValueBytes()
log.PanicIf(err)
switch value.(type) { return valueBytes, false, nil
case []byte: default:
return value.([]byte), false, nil
case string:
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
default:
// TODO(dustin): !! Finish translating the rest of the types (make reusable and replace into other similar implementations?) // TODO(dustin): !! Finish translating the rest of the types (make reusable and replace into other similar implementations?)
log.Panicf("can not produce bytes for unknown-type tag (0x%04x): [%s]", ite.TagId, reflect.TypeOf(value)) log.Panicf("can not produce bytes for unknown-type tag (0x%04x): [%s]", ite.TagId, reflect.TypeOf(value))
}
} }
}
originalType := NewTagType(ite.TagType, ie.byteOrder)
byteCount := uint32(originalType.Size()) * ite.UnitCount
tt := NewTagType(TypeByte, ie.byteOrder)
if tt.ValueIsEmbedded(byteCount) == true {
iteLogger.Debugf(nil, "Reading BYTE value (ITE; embedded).")
// In this case, the bytes normally used for the offset are actually
// data.
valueBytes, err = tt.ParseBytes(ite.RawValueOffset, byteCount)
log.PanicIf(err)
} else { } else {
iteLogger.Debugf(nil, "Reading BYTE value (ITE; at offset).") originalType := NewTagType(ite.TagType, ie.byteOrder)
byteCount := uint32(originalType.Size()) * ite.UnitCount
valueBytes, err = tt.ParseBytes(addressableData[ite.ValueOffset:], byteCount) tt := NewTagType(TypeByte, ie.byteOrder)
log.PanicIf(err)
if tt.ValueIsEmbedded(byteCount) == true {
iteLogger.Debugf(nil, "Reading BYTE value (ITE; embedded).")
// In this case, the bytes normally used for the offset are actually
// data.
valueBytes, err = tt.ParseBytes(ite.RawValueOffset, byteCount)
log.PanicIf(err)
} else {
iteLogger.Debugf(nil, "Reading BYTE value (ITE; at offset).")
valueBytes, err = tt.ParseBytes(addressableData[ite.ValueOffset:], byteCount)
log.PanicIf(err)
}
} }
return valueBytes, false, nil return valueBytes, false, nil