Fix problem with MultiEncoder DecodeParms. Fixes #97.

Author: Gunnsteinn Hall

pdf/core/encoding.go

@@ -1667,10 +1667,11 @@ func newMultiEncoderFromStream(streamObj *PdfObjectStream) (*MultiEncoder, error
 		arr, isArray := obj.(*PdfObjectArray)
 		if isArray {
 			for _, dictObj := range *arr {
+				dictObj = TraceToDirectObject(dictObj)
 				if dict, is := dictObj.(*PdfObjectDictionary); is {
 					decodeParamsArray = append(decodeParamsArray, dict)
 				} else {
-					decodeParamsArray = append(decodeParamsArray, nil)
+					decodeParamsArray = append(decodeParamsArray, MakeDict())
 				}
 			}
 		}
@@ -1713,7 +1714,7 @@ func newMultiEncoderFromStream(streamObj *PdfObjectStream) (*MultiEncoder, error
 			dParams = dict
 		}
 
-		common.Log.Trace("Next name: %s", *name)
+		common.Log.Trace("Next name: %s, dp: %v, dParams: %v", *name, dp, dParams)
 		if *name == StreamEncodingFilterNameFlate {
 			// XXX: need to separate out the DecodeParms..
 			encoder, err := newFlateEncoderFromStream(streamObj, dParams)