Imported Upstream version 4.8.1

[platform/upstream/gcc48.git] / libgo / go / hash / adler32 / adler32_test.go

diff --git a/libgo/go/hash/adler32/adler32_test.go b/libgo/go/hash/adler32/adler32_test.go
index 01f931c..0e9c938 100644 (file)
--- a/libgo/go/hash/adler32/adler32_test.go
+++ b/libgo/go/hash/adler32/adler32_test.go
@@ -5,26 +5,23 @@
 package adler32
 
 import (
-       "bytes"
-       "io"
+       "strings"
        "testing"
 )
 
-type _Adler32Test struct {
+var golden = []struct {
        out uint32
        in  string
-}
-
-var golden = []_Adler32Test{
-       {0x1, ""},
-       {0x620062, "a"},
-       {0x12600c4, "ab"},
-       {0x24d0127, "abc"},
-       {0x3d8018b, "abcd"},
-       {0x5c801f0, "abcde"},
-       {0x81e0256, "abcdef"},
-       {0xadb02bd, "abcdefg"},
-       {0xe000325, "abcdefgh"},
+}{
+       {0x00000001, ""},
+       {0x00620062, "a"},
+       {0x012600c4, "ab"},
+       {0x024d0127, "abc"},
+       {0x03d8018b, "abcd"},
+       {0x05c801f0, "abcde"},
+       {0x081e0256, "abcdef"},
+       {0x0adb02bd, "abcdefg"},
+       {0x0e000325, "abcdefgh"},
        {0x118e038e, "abcdefghi"},
        {0x158603f8, "abcdefghij"},
        {0x3f090f02, "Discard medicine more than two years old."},
@@ -48,30 +45,61 @@ var golden = []_Adler32Test{
        {0x91dd304f, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction.  Lewis-Randall Rule"},
        {0x2e5d1316, "How can you write a big system without C++?  -Paul Glick"},
        {0xd0201df6, "'Invariant assertions' is the most elegant programming technique!  -Tom Szymanski"},
+       {0x211297c8, strings.Repeat("\xff", 5548) + "8"},
+       {0xbaa198c8, strings.Repeat("\xff", 5549) + "9"},
+       {0x553499be, strings.Repeat("\xff", 5550) + "0"},
+       {0xf0c19abe, strings.Repeat("\xff", 5551) + "1"},
+       {0x8d5c9bbe, strings.Repeat("\xff", 5552) + "2"},
+       {0x2af69cbe, strings.Repeat("\xff", 5553) + "3"},
+       {0xc9809dbe, strings.Repeat("\xff", 5554) + "4"},
+       {0x69189ebe, strings.Repeat("\xff", 5555) + "5"},
+       {0x86af0001, strings.Repeat("\x00", 1e5)},
+       {0x79660b4d, strings.Repeat("a", 1e5)},
+       {0x110588ee, strings.Repeat("ABCDEFGHIJKLMNOPQRSTUVWXYZ", 1e4)},
+}
+
+// checksum is a slow but simple implementation of the Adler-32 checksum.
+// It is a straight port of the sample code in RFC 1950 section 9.
+func checksum(p []byte) uint32 {
+       s1, s2 := uint32(1), uint32(0)
+       for _, x := range p {
+               s1 = (s1 + uint32(x)) % mod
+               s2 = (s2 + s1) % mod
+       }
+       return s2<<16 | s1
 }
 
 func TestGolden(t *testing.T) {
-       for i := 0; i < len(golden); i++ {
-               g := golden[i]
-               c := New()
-               io.WriteString(c, g.in)
-               s := c.Sum32()
-               if s != g.out {
-                       t.Errorf("adler32(%s) = 0x%x want 0x%x", g.in, s, g.out)
-                       t.FailNow()
+       for _, g := range golden {
+               in := g.in
+               if len(in) > 220 {
+                       in = in[:100] + "..." + in[len(in)-100:]
+               }
+               p := []byte(g.in)
+               if got := checksum(p); got != g.out {
+                       t.Errorf("simple implementation: checksum(%q) = 0x%x want 0x%x", in, got, g.out)
+                       continue
+               }
+               if got := Checksum(p); got != g.out {
+                       t.Errorf("optimized implementation: Checksum(%q) = 0x%x want 0x%x", in, got, g.out)
+                       continue
                }
        }
 }
 
-func BenchmarkGolden(b *testing.B) {
-       b.StopTimer()
-       c := New()
-       var buf bytes.Buffer
-       for _, g := range golden {
-               buf.Write([]byte(g.in))
+func BenchmarkAdler32KB(b *testing.B) {
+       b.SetBytes(1024)
+       data := make([]byte, 1024)
+       for i := range data {
+               data[i] = byte(i)
        }
-       b.StartTimer()
+       h := New()
+       in := make([]byte, 0, h.Size())
+
+       b.ResetTimer()
        for i := 0; i < b.N; i++ {
-               c.Write(buf.Bytes())
+               h.Reset()
+               h.Write(data)
+               h.Sum(in)
        }
 }