hash/crc64: Add tests for ECMA polynomial

Currently we test crc64 only with ISO polynomial.

Change-Id: Ibc5e202db3b960369cbbb18e31eb0fea07b54dba
Reviewed-on: https://go-review.googlesource.com/21309
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/hash/crc64/crc64_test.go

@@ -10,66 +10,75 @@ import (
 )
 
 type test struct {
-	out uint64
+	outISO  uint64
+	outECMA uint64
 	in      string
 }
 
 var golden = []test{
-	{0x0, ""},
-	{0x3420000000000000, "a"},
-	{0x36c4200000000000, "ab"},
-	{0x3776c42000000000, "abc"},
-	{0x336776c420000000, "abcd"},
-	{0x32d36776c4200000, "abcde"},
-	{0x3002d36776c42000, "abcdef"},
-	{0x31b002d36776c420, "abcdefg"},
-	{0xe21b002d36776c4, "abcdefgh"},
-	{0x8b6e21b002d36776, "abcdefghi"},
-	{0x7f5b6e21b002d367, "abcdefghij"},
-	{0x8ec0e7c835bf9cdf, "Discard medicine more than two years old."},
-	{0xc7db1759e2be5ab4, "He who has a shady past knows that nice guys finish last."},
-	{0xfbf9d9603a6fa020, "I wouldn't marry him with a ten foot pole."},
-	{0xeafc4211a6daa0ef, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave"},
-	{0x3e05b21c7a4dc4da, "The days of the digital watch are numbered.  -Tom Stoppard"},
-	{0x5255866ad6ef28a6, "Nepal premier won't resign."},
-	{0x8a79895be1e9c361, "For every action there is an equal and opposite government program."},
-	{0x8878963a649d4916, "His money is twice tainted: 'taint yours and 'taint mine."},
-	{0xa7b9d53ea87eb82f, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977"},
-	{0xdb6805c0966a2f9c, "It's a tiny change to the code and not completely disgusting. - Bob Manchek"},
-	{0xf3553c65dacdadd2, "size:  a.out:  bad magic"},
-	{0x9d5e034087a676b9, "The major problem is with sendmail.  -Mark Horton"},
-	{0xa6db2d7f8da96417, "Give me a rock, paper and scissors and I will move the world.  CCFestoon"},
-	{0x325e00cd2fe819f9, "If the enemy is within range, then so are you."},
-	{0x88c6600ce58ae4c6, "It's well we cannot hear the screams/That we create in others' dreams."},
-	{0x28c4a3f3b769e078, "You remind me of a TV show, but that's all right: I watch it anyway."},
-	{0xa698a34c9d9f1dca, "C is as portable as Stonehedge!!"},
-	{0xf6c1e2a8c26c5cfc, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley"},
-	{0xd402559dfe9b70c, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction.  Lewis-Randall Rule"},
-	{0xdb6efff26aa94946, "How can you write a big system without C++?  -Paul Glick"},
+	{0x0, 0x0, ""},
+	{0x3420000000000000, 0x330284772e652b05, "a"},
+	{0x36c4200000000000, 0xbc6573200e84b046, "ab"},
+	{0x3776c42000000000, 0x2cd8094a1a277627, "abc"},
+	{0x336776c420000000, 0x3c9d28596e5960ba, "abcd"},
+	{0x32d36776c4200000, 0x40bdf58fb0895f2, "abcde"},
+	{0x3002d36776c42000, 0xd08e9f8545a700f4, "abcdef"},
+	{0x31b002d36776c420, 0xec20a3a8cc710e66, "abcdefg"},
+	{0xe21b002d36776c4, 0x67b4f30a647a0c59, "abcdefgh"},
+	{0x8b6e21b002d36776, 0x9966f6c89d56ef8e, "abcdefghi"},
+	{0x7f5b6e21b002d367, 0x32093a2ecd5773f4, "abcdefghij"},
+	{0x8ec0e7c835bf9cdf, 0x8a0825223ea6d221, "Discard medicine more than two years old."},
+	{0xc7db1759e2be5ab4, 0x8562c0ac2ab9a00d, "He who has a shady past knows that nice guys finish last."},
+	{0xfbf9d9603a6fa020, 0x3ee2a39c083f38b4, "I wouldn't marry him with a ten foot pole."},
+	{0xeafc4211a6daa0ef, 0x1f603830353e518a, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave"},
+	{0x3e05b21c7a4dc4da, 0x2fd681d7b2421fd, "The days of the digital watch are numbered.  -Tom Stoppard"},
+	{0x5255866ad6ef28a6, 0x790ef2b16a745a41, "Nepal premier won't resign."},
+	{0x8a79895be1e9c361, 0x3ef8f06daccdcddf, "For every action there is an equal and opposite government program."},
+	{0x8878963a649d4916, 0x49e41b2660b106d, "His money is twice tainted: 'taint yours and 'taint mine."},
+	{0xa7b9d53ea87eb82f, 0x561cc0cfa235ac68, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977"},
+	{0xdb6805c0966a2f9c, 0xd4fe9ef082e69f59, "It's a tiny change to the code and not completely disgusting. - Bob Manchek"},
+	{0xf3553c65dacdadd2, 0xe3b5e46cd8d63a4d, "size:  a.out:  bad magic"},
+	{0x9d5e034087a676b9, 0x865aaf6b94f2a051, "The major problem is with sendmail.  -Mark Horton"},
+	{0xa6db2d7f8da96417, 0x7eca10d2f8136eb4, "Give me a rock, paper and scissors and I will move the world.  CCFestoon"},
+	{0x325e00cd2fe819f9, 0xd7dd118c98e98727, "If the enemy is within range, then so are you."},
+	{0x88c6600ce58ae4c6, 0x70fb33c119c29318, "It's well we cannot hear the screams/That we create in others' dreams."},
+	{0x28c4a3f3b769e078, 0x57c891e39a97d9b7, "You remind me of a TV show, but that's all right: I watch it anyway."},
+	{0xa698a34c9d9f1dca, 0xa1f46ba20ad06eb7, "C is as portable as Stonehedge!!"},
+	{0xf6c1e2a8c26c5cfc, 0x7ad25fafa1710407, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley"},
+	{0xd402559dfe9b70c, 0x73cef1666185c13f, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction.  Lewis-Randall Rule"},
+	{0xdb6efff26aa94946, 0xb41858f73c389602, "How can you write a big system without C++?  -Paul Glick"},
+	{0xe7fcf1006b503b61, 0x27db187fc15bbc72, "This is a test of the emergency broadcast system."},
 }
 
-var tab = MakeTable(ISO)
-
 func TestGolden(t *testing.T) {
+	tabISO := MakeTable(ISO)
+	tabECMA := MakeTable(ECMA)
 	for i := 0; i < len(golden); i++ {
 		g := golden[i]
-		c := New(tab)
+		c := New(tabISO)
 		io.WriteString(c, g.in)
 		s := c.Sum64()
-		if s != g.out {
-			t.Errorf("crc64(%s) = 0x%x want 0x%x", g.in, s, g.out)
+		if s != g.outISO {
+			t.Errorf("ISO crc64(%s) = 0x%x want 0x%x", g.in, s, g.outISO)
+			t.FailNow()
+		}
+		c = New(tabECMA)
+		io.WriteString(c, g.in)
+		s = c.Sum64()
+		if s != g.outECMA {
+			t.Errorf("ECMA crc64(%s) = 0x%x want 0x%x", g.in, s, g.outECMA)
 			t.FailNow()
 		}
 	}
 }
 
-func BenchmarkCrc64KB(b *testing.B) {
+func BenchmarkISOCrc64KB(b *testing.B) {
 	b.SetBytes(1024)
 	data := make([]byte, 1024)
 	for i := range data {
 		data[i] = byte(i)
 	}
-	h := New(tab)
+	h := New(MakeTable(ISO))
 	in := make([]byte, 0, h.Size())
 
 	b.ResetTimer()