test channels are DCT compressed before DWA decompression (#845)

Signed-off-by: Peter Hillman <peterh@wetafx.co.nz>
AcademySoftwareFoundation · Oct 6, 2020 · 7abf780 · 7abf780
1 parent eec0dba
commit 7abf780
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/OpenEXR/IlmImf/ImfDwaCompressor.cpp b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
@@ -2681,6 +2681,10 @@ DwaCompressor::uncompress
         int gChan = _cscSets[csc].idx[1];    
         int bChan = _cscSets[csc].idx[2];    
 
+        if (_channelData[rChan].compression != LOSSY_DCT || _channelData[gChan].compression != LOSSY_DCT || _channelData[bChan].compression != LOSSY_DCT)
+        {
+            throw IEX_NAMESPACE::BaseExc("Bad DWA compression type detected");
+        }
 
         LossyDctDecoderCsc decoder
             (rowPtrs[rChan],