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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package crc
import (
"hash/crc32"
"reflect"
"testing"
)
// TestHash32 tests that Hash32 provided by this package can take an initial
// crc and behaves exactly the same as the standard one in the following calls.
func TestHash32(t *testing.T) {
stdhash := crc32.New(crc32.IEEETable)
if _, err := stdhash.Write([]byte("test data")); err != nil {
t.Fatalf("unexpected write error: %v", err)
}
// create a new hash with stdhash.Sum32() as initial crc
hash := New(stdhash.Sum32(), crc32.IEEETable)
wsize := stdhash.Size()
if g := hash.Size(); g != wsize {
t.Errorf("size = %d, want %d", g, wsize)
}
wbsize := stdhash.BlockSize()
if g := hash.BlockSize(); g != wbsize {
t.Errorf("block size = %d, want %d", g, wbsize)
}
wsum32 := stdhash.Sum32()
if g := hash.Sum32(); g != wsum32 {
t.Errorf("Sum32 = %d, want %d", g, wsum32)
}
wsum := stdhash.Sum(make([]byte, 32))
if g := hash.Sum(make([]byte, 32)); !reflect.DeepEqual(g, wsum) {
t.Errorf("sum = %v, want %v", g, wsum)
}
// write something
if _, err := stdhash.Write([]byte("test data")); err != nil {
t.Fatalf("unexpected write error: %v", err)
}
if _, err := hash.Write([]byte("test data")); err != nil {
t.Fatalf("unexpected write error: %v", err)
}
wsum32 = stdhash.Sum32()
if g := hash.Sum32(); g != wsum32 {
t.Errorf("Sum32 after write = %d, want %d", g, wsum32)
}
// reset
stdhash.Reset()
hash.Reset()
wsum32 = stdhash.Sum32()
if g := hash.Sum32(); g != wsum32 {
t.Errorf("Sum32 after reset = %d, want %d", g, wsum32)
}
}
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