(had more trouble with push) set fields so that callers can inspect t…

…he state of the hasher

sabuhash.h

@@ -204,6 +204,8 @@ class SabuHash
 			hF = forward(hF) ^ kernelTable[chIn];
 			}
 
+		hForward = hF;
+
 		hF = avalanche(hF);
 		if (hF == 0) return 1;
 		        else return hF;
@@ -224,6 +226,8 @@ class SabuHash
 			hF = forward(hF) ^ kernelTable[chIn];
 			}
 
+		hForward = hF;
+
 		hF = avalanche(hF);
 		if (hF == 0) return 1;
 		        else return hF;
@@ -246,14 +250,16 @@ class SabuHash
 			hF = backward(hF ^ forwardByK2[twoBits]);
 			}
 
+		hForward = hF;
+
 		hF = avalanche(hF);
 		if (hF == 0) return 1;
 		        else return hF;
 		}
 
 	inline std::uint64_t rolling_hash
 	   (const unsigned char chIn,
-		const unsigned char chOut=0)
+		const unsigned char chOut=0)  // this was chIn k characters earlier
 		{
 		// note that we return 0 iff we don't yet have k characters
 
@@ -493,6 +499,9 @@ class SabuHashCanonical
 			hR = SabuHash::backward(hR ^ forwardByK_RC[chIn]);
 			}
 
+		hForward = hF;
+		hRevComp = hR;
+
 		std::uint64_t h = SabuHash::avalanche(hF+hR);
 		if (h == 0) return 1;
 		       else return h;
@@ -515,6 +524,9 @@ class SabuHashCanonical
 			hR = SabuHash::backward(hR ^ forwardByK_RC[chIn]);
 			}
 
+		hForward = hF;
+		hRevComp = hR;
+
 		std::uint64_t h = SabuHash::avalanche(hF+hR);
 		if (h == 0) return 1;
 		       else return h;
@@ -537,14 +549,17 @@ class SabuHashCanonical
 			hR = SabuHash::forward(hR) ^ kernelTable2_RC[twoBits];
 			}
 
+		hForward = hF;
+		hRevComp = hR;
+
 		std::uint64_t h = SabuHash::avalanche(hF+hR);
 		if (h == 0) return 1;
 		       else return h;
 		}
 
 	inline std::uint64_t rolling_hash
 	   (const unsigned char chIn,
-		const unsigned char chOut=0)
+		const unsigned char chOut=0)  // this was chIn k characters earlier
 		{
 		// note that we return 0 iff we don't yet have k characters