modify piece hash construction in EncodeDataToPieces

build/storage/storage.go

@@ -11,6 +11,13 @@ type Data = io.Reader
 
 type Hash = [32]byte
 
+type DecodedData struct {
+	HasPre    bool
+	PreHash   Hash
+	Data      []byte
+	PieceHash []Hash
+}
+
 type SectorRef struct {
 	ID        abi.SectorID
 	ProofType abi.RegisteredSealProof

seal/type.go

@@ -21,8 +21,8 @@ type SectorSealer interface{
 	Sealed(ctx context.Context, sid storage.SectorRef, seed abi.InteractiveSealRandomness, ticket abi.SealRandomness, pieces []abi.PieceInfo) (storage.SectorCids, []byte, error) 
 	// Split and encode data into pieces
 	// Pieces structure is [ Tag | MetaData | HashData ] or [ Tag | PreHash | HashData]
-	EncodeDataToPieces(ctx context.Context, sectorSize abi.SectorSize, file storage.Data) (storage.Hash, error)
-	DecodePiece(ctx context.Context, sectorSize abi.SectorSize, in io.Reader, start storiface.UnpaddedByteIndex, end storiface.UnpaddedByteIndex) (bool, storage.Hash, []byte, []storage.Hash, error)
+	EncodeDataToPieces(ctx context.Context, sectorSize abi.SectorSize, file storage.Data) (storage.Hash, []storage.Hash, error)
+	DecodePiece(ctx context.Context, sectorSize abi.SectorSize, in io.Reader, start storiface.UnpaddedByteIndex, end storiface.UnpaddedByteIndex) (storage.DecodedData, error)
 	GenerateCommit2Proof( ctx context.Context, sid storage.SectorRef, seed abi.InteractiveSealRandomness, ticket abi.SealRandomness, pieces []abi.PieceInfo, cids storage.SectorCids) (storage.Proof, error)
 	GenerateWindowPoStProofs(ctx context.Context, minerID abi.ActorID, sectorInfo []spproof.SectorInfo, randomness abi.PoStRandomness) ([]spproof.PoStProof, []abi.SectorID, error)
 	UnsealedRange(ctx context.Context, sid storage.SectorRef, sectorSize abi.SectorSize, ticket abi.SealRandomness, commd cid.Cid, out io.Writer, offset storiface.UnpaddedByteIndex, size abi.UnpaddedPieceSize) error