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package cryptocore
import (
"bytes"
"compress/flate"
"runtime"
"sync"
"testing"
)
// TestRandPrefetch hammers the randPrefetcher with 100 goroutines and verifies
// that the result is incompressible
func TestRandPrefetch(t *testing.T) {
runtime.GOMAXPROCS(10)
p := 100
l := 200
vec := make([][]byte, p)
var wg sync.WaitGroup
for i := 0; i < p; i++ {
wg.Add(1)
go func(i int) {
var tmp []byte
for x := 0; x < l; x++ {
tmp = append(tmp, randPrefetcher.read(l)...)
}
vec[i] = tmp
wg.Done()
}(i)
}
wg.Wait()
var b bytes.Buffer
fw, _ := flate.NewWriter(&b, flate.BestCompression)
for _, v := range vec {
fw.Write(v)
}
fw.Close()
if b.Len() < p*l*l {
t.Errorf("random data should be incompressible, but: in=%d compressed=%d\n", p*l*l, b.Len())
}
}
func BenchmarkRandPrefetch(b *testing.B) {
// 16-byte nonces are default since gocryptfs v0.7
b.SetBytes(16)
for i := 0; i < b.N; i++ {
randPrefetcher.read(16)
}
}
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