swarm/storage: remove unused methods from Chunk interface

swarm/storage/common_test.go

@@ -179,8 +179,9 @@ func testStoreCorrect(m ChunkStore, n int, chunksize int64, t *testing.T) {
 			return fmt.Errorf("key does not match retrieved chunk Address")
 		}
 		hasher := MakeHashFunc(DefaultHash)()
-		hasher.ResetWithLength(chunk.SpanBytes())
-		hasher.Write(chunk.Payload())
+		data := chunk.Data()
+		hasher.ResetWithLength(data[:8])
+		hasher.Write(data[8:])
 		exp := hasher.Sum(nil)
 		if !bytes.Equal(h, exp) {
 			return fmt.Errorf("key is not hash of chunk data")

swarm/storage/memstore.go

@@ -57,7 +57,7 @@ func (m *MemStore) Get(_ context.Context, addr Address) (Chunk, error) {
 	if !ok {
 		return nil, ErrChunkNotFound
 	}
-	return c.(*chunk), nil
+	return c.(Chunk), nil
 }
 
 func (m *MemStore) Put(_ context.Context, c Chunk) error {

swarm/storage/types.go

@@ -184,9 +184,6 @@ func (c AddressCollection) Swap(i, j int) {
 // Chunk interface implemented by context.Contexts and data chunks
 type Chunk interface {
 	Address() Address
-	Payload() []byte
-	SpanBytes() []byte
-	Span() int64
 	Data() []byte
 }
 
@@ -208,25 +205,10 @@ func (c *chunk) Address() Address {
 	return c.addr
 }
 
-func (c *chunk) SpanBytes() []byte {
-	return c.sdata[:8]
-}
-
-func (c *chunk) Span() int64 {
-	if c.span == -1 {
-		c.span = int64(binary.LittleEndian.Uint64(c.sdata[:8]))
-	}
-	return c.span
-}
-
 func (c *chunk) Data() []byte {
 	return c.sdata
 }
 
-func (c *chunk) Payload() []byte {
-	return c.sdata[8:]
-}
-
 // String() for pretty printing
 func (self *chunk) String() string {
 	return fmt.Sprintf("Address: %v TreeSize: %v Chunksize: %v", self.addr.Log(), self.span, len(self.sdata))