Add sanity checks

Author: flanglet

src/transform/BWT.cpp

@@ -116,7 +116,9 @@ bool BWT::forward(SliceArray<byte>& input, SliceArray<byte>& output, int count)
          _sa = new int[_saSize];
     }
 
-    _saAlgo.computeBWT(src, dst, _sa, count, _primaryIndexes, getBWTChunks(count));
+    if (_saAlgo.computeBWT(src, dst, _sa, count, _primaryIndexes, getBWTChunks(count)) <= 0)
+        return false;
+
     input._index += count;
     output._index += count;
     return true;

src/transform/DivSufSort.cpp

@@ -170,6 +170,10 @@ int DivSufSort::computeBWT(const byte input[], byte output[], int bwt[], int len
     reset();
     const int m = sortTypeBstar(_bucketA, _bucketB, length);
     const int pIdx = constructBWT(_bucketA, _bucketB, length, m, indexes, idxCount);
+
+    if (pIdx < 0)
+        return -1;
+
     output[0] = input[length - 1];
 
     for (int i = 0; i < pIdx; i++)