OpenEXR/IlmImfTest/testHuf.cpp: Do the compressVerify() on determinis…

…tic data sets.

Updated to run compressVerify() on the fill4() and fill5() data sets which are
deterministic across platforms.
Added a comment to explain how these DEK hash are determined aprior for code
defines.

Signed-off-by: Arkell Rasiah <arasiah@pixsystem.com>

OpenEXR/IlmImfTest/testHuf.cpp

@@ -176,6 +176,15 @@ compressUncompressSubset(const unsigned short raw[], int n)
 //  This check is intended to test for regressions
 //  in the hufCompress() result or difference results across OSes.
 // 
+// The platform agnostic DEK hash of the huf compressed data for
+// the set of numbers generated by fill4() and fill5().
+// This DEK hash is determined from an aprior initial run of this
+// test noting its value from the assert message compressVerify().
+// 
+#define  HUF_COMPRESS_DEK_HASH_FOR_FILL4_USHRT_MAX_PLUS_ONE 2956869585U
+#define  HUF_COMPRESS_DEK_HASH_FOR_FILL4_N 3414126535U
+#define  HUF_COMPRESS_DEK_HASH_FOR_FILL5_N 169791374U
+
 void
 compressVerify (const unsigned short raw[], 
                 int n,
@@ -221,7 +230,6 @@ testHuf (const std::string&)
 	Array <unsigned short> raw (N);
 
 	fill1 (raw, N, 1, rand48);	  // test various symbol distributions
-        compressVerify(raw, N, 3762495704U);
 	compressUncompress (raw, N);
 	compressUncompressSubset (raw, N);
 	fill1 (raw, N, 10, rand48);
@@ -261,9 +269,11 @@ testHuf (const std::string&)
 	compressUncompressSubset (raw, N);
 
 	fill4 (raw, USHRT_MAX + 1);
+        compressVerify(raw, USHRT_MAX + 1, HUF_COMPRESS_DEK_HASH_FOR_FILL4_USHRT_MAX_PLUS_ONE);
 	compressUncompress (raw, USHRT_MAX + 1);
 	compressUncompressSubset (raw, USHRT_MAX + 1);
 	fill4 (raw, N);
+        compressVerify(raw, N, HUF_COMPRESS_DEK_HASH_FOR_FILL4_N);
 	compressUncompress (raw, N);
 	compressUncompressSubset (raw, N);
 
@@ -277,6 +287,7 @@ testHuf (const std::string&)
 	compressUncompress (raw, 3);
 
 	fill5 (raw, N);			// test run-length coding of code table
+        compressVerify(raw, N, HUF_COMPRESS_DEK_HASH_FOR_FILL5_N);
 	compressUncompress (raw, N);
 	compressUncompressSubset (raw, N);