func DecodeTuple(block1, block2 []byte, bck bucket.Bucket, tuple [][]byte) (e error) {
ts := len(tuple)
e = bck.ELoad(tuple[0], block1)
if e != nil {
return
}
for i := 1; i < ts; i++ {
e = bck.ELoad(tuple[i], block2)
if e != nil {
return
}
blockutil.XorBlock(block1, block2)
}
return
}
func TestDecodeTuple(block1, block2 []byte, bck bucket.Bucket, tuple [][]byte, hashes chan []byte) (ok bool) {
ts := len(tuple)
ok = true
e := bck.ELoad(tuple[0], block1)
if e != nil {
hashes <- tuple[0]
ok = false
}
for i := 1; i < ts; i++ {
e2 := bck.ELoad(tuple[i], block2)
if e2 != nil {
hashes <- tuple[i]
ok = false
}
blockutil.XorBlock(block1, block2)
}
return
}
// block1 should be already initialized
func GenerateTupleFromBlock(block1, block2 []byte, rand io.Reader, bck bucket.Bucket, tupleSize int) (tuple [][]byte, e error) {
tuple = make([][]byte, tupleSize)
for i := 1; i < tupleSize; i++ {
e = blockutil.RandomBlock(rand, block2)
if e != nil {
return
}
tuple[i], e = bucket.StoreBlock(bck, block2)
if e != nil {
return
}
blockutil.XorBlock(block1, block2) // block1 ^= block2
}
tuple[0], e = bucket.StoreBlock(bck, block1)
if e != nil {
return
}
return
}
func MeterDecodeTuple(block1, block2 []byte, bck bucket.Bucket, tuple [][]byte, hashes chan []byte, metrik *Metrik) (ok bool) {
ts := len(tuple)
ok = true
e := bck.ELoad(tuple[0], block1)
metrik.Max++
if e != nil {
hashes <- tuple[0]
ok = false
} else {
metrik.Count++
}
for i := 1; i < ts; i++ {
e2 := bck.ELoad(tuple[i], block2)
metrik.Max++
if e2 != nil {
hashes <- tuple[i]
ok = false
} else {
metrik.Count++
}
blockutil.XorBlock(block1, block2)
}
return
}