Have raczlib check the dictionary TTag
diff --git a/lib/raczlib/reader.go b/lib/raczlib/reader.go
index bc3cd13..2a99272 100644
--- a/lib/raczlib/reader.go
+++ b/lib/raczlib/reader.go
@@ -316,7 +316,7 @@
dict := []byte(nil)
if !chunk.CSecondary.Empty() {
- if dict, err = r.loadDictionary(chunk.CSecondary); err != nil {
+ if dict, err = r.loadDictionary(chunk.CSecondary, chunk.TTag); err != nil {
return err
}
}
@@ -358,15 +358,15 @@
//
// For a description of the RAC+Zlib secondary-data format, see
// https://github.com/google/wuffs/blob/master/doc/spec/rac-spec.md#rac--zlib
-func (r *Reader) loadDictionary(cRange rac.Range) ([]byte, error) {
+func (r *Reader) loadDictionary(cRange rac.Range, tTag uint8) ([]byte, error) {
// Load from the MRU cache, if it was loaded from the same cRange.
if (cRange == r.cachedDictionaryCRange) && !cRange.Empty() {
return r.cachedDictionary, nil
}
r.cachedDictionaryCRange = rac.Range{}
- // Check the cRange size.
- if (cRange.Size() < 6) || (cRange[1] > r.CompressedSize) {
+ // Check the cRange size and the tTag.
+ if (cRange.Size() < 6) || (cRange[1] > r.CompressedSize) || (tTag != 0xFF) {
r.err = errInvalidDictionary
return nil, r.err
}
