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package contentenc
import (
"fmt"
"testing"
"github.com/rfjakob/gocryptfs/internal/cryptocore"
)
// TestSizeToSize tests CipherSizeToPlainSize and PlainSizeToCipherSize
func TestSizeToSize(t *testing.T) {
key := make([]byte, cryptocore.KeyLen)
cc := cryptocore.New(key, cryptocore.BackendGoGCM, DefaultIVBits, true, false)
ce := New(cc, DefaultBS, false)
const rangeMax = 10000
var c2p [rangeMax]uint64
var p2c [rangeMax]uint64
// Calculate values
for i := range c2p {
c2p[i] = ce.CipherSizeToPlainSize(uint64(i))
p2c[i] = ce.PlainSizeToCipherSize(uint64(i))
}
// Print data table
fmt.Print("x\tToPlainSize\tToCipherSize\n")
for i := range c2p {
if i > 1 && i < rangeMax-1 {
// If the point before has value-1 and the point after has value+1,
// it is not interesting. Don't print it out.
if c2p[i] == c2p[i-1]+1 && p2c[i] == p2c[i-1]+1 && c2p[i+1] == c2p[i]+1 && p2c[i+1] == p2c[i]+1 {
continue
}
}
fmt.Printf("%d\t%d\t%d\n", i, c2p[i], p2c[i])
}
// Monotonicity check
for i := range c2p {
if i < 1 {
continue
}
if c2p[i-1] > c2p[i] {
t.Errorf("error: c2p is non-monotonic: c2p[%d]=%d c2p[%d]=%d ", i-1, c2p[i-1], i, c2p[i])
}
if p2c[i-1] > p2c[i] {
t.Errorf("error: p2c is non-monotonic: p2c[%d]=%d p2c[%d]=%d ", i-1, p2c[i-1], i, p2c[i])
}
}
}
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