extracted CRC32C for some Intel chips; refactored checksum tests

Author: source-c

src-clj/zlib_tiny/core.clj

@@ -6,7 +6,7 @@
                           DeflaterInputStream
                           Deflater
                           ZipException
-                          CRC32)
+                          CRC32 CRC32C)
            (zlib_tiny CRC64)
            (org.apache.commons.io IOUtils)
            (java.security MessageDigest)
@@ -100,6 +100,10 @@
   ^Long [^bytes b]
   (wrap-crc CRC32 b))
 
+(defn crc32c
+  ^Long [^bytes b]
+  (wrap-crc CRC32C b))
+
 (defn crc64
   ^Long [^bytes b]
   (wrap-crc CRC64 b))

test/zlib_tiny/checksum.clj

@@ -6,10 +6,19 @@
 (def test-string "test it!")
 
 (deftest checksums
-  (testing "CRC32"
-    (is (= 3421780262 (crc32 (.getBytes "123456789")))))
-  (testing "CRC64"
-    (is (= -7395533204333446662 (crc64 (.getBytes "123456789"))))))
+  (let [input "123456789"
+        bs (.getBytes input)]
+    (println "Test input string:" input)
+    (println "Test input bytes:" (hexlify bs))
+    (testing "CRC32"
+      (println "CRC32 checks:")
+      (is (= 3421780262 (time (crc32 bs))) "CRC32 mismatch"))
+    (testing "CRC32C"
+      (println "CRC32C checks:")
+      (is (= 3808858755 (time (crc32c bs))) "CRC32C mismatch"))
+    (testing "CRC64"
+      (println "CRC64 checks:")
+      (is (= -7395533204333446662 (time (crc64 bs))) "CRC64 mismatch"))))
 
 (deftest digests
   (testing "MD5"