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package contentenc
import (
"fmt"
"testing"
"github.com/rfjakob/gocryptfs/v2/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
// y values in this order:
// 0 ... CipherSizeToPlainSize
// 1 ... PlainSizeToCipherSize
// 2 ... PlainOffToCipherOff
var yTable [rangeMax][3]uint64
// Calculate values
for x := range yTable {
yTable[x][0] = ce.CipherSizeToPlainSize(uint64(x))
yTable[x][1] = ce.PlainSizeToCipherSize(uint64(x))
yTable[x][2] = ce.PlainOffToCipherOff(uint64(x))
}
// Print data table
fmt.Print("x\tCipherSizeToPlainSize\tPlainSizeToCipherSize\tPlainOffToCipherOff\n")
for x := range yTable {
if x > 1 && x < 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.
interesting := false
for i := 0; i <= 2; i++ {
if yTable[x-1][i]+1 != yTable[x][i] && yTable[x][i]+1 != yTable[x+1][i]+1 {
interesting = true
}
// Monotonicity check
if yTable[x][i] < yTable[x-1][i] {
t.Errorf("column %d is non-monotonic!", i)
}
}
if !interesting {
continue
}
}
fmt.Printf("%d\t%d\t%d\t%d\n", x, yTable[x][0], yTable[x][1], yTable[x][2])
}
}
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