add user api

actor/user/testuser.go

+package user
+
+import(
+	"context"
+)
+
+func TestUser() error {
+	
+}
\ No newline at end of file

actor/user/type.go

+package user
+
+import(
+	"io"
+	"context"
+
+	"fil_integrate/build/state-types/abi"
+	"fil_integrate/build/storage"
+)
+
+type UserAPI interface {
+	EncodeDataToPieces(ctx context.Context, file storage.Data) (storage.Piece, []storage.Piece, error)
+	ReadPieceRange(ctx context.Context, out io.Writer, piece storage.Piece, offset storiface.UnpaddedByteIndex, size abi.UnpaddedPieceSize) error
+}
\ No newline at end of file

actor/user/user.go

+package user
+
+import(
+	"context"
+
+	"fil_integrate/build/storage"
+	"fil_integrate/seal"
+)
+
+type User struct{
+	sectorSize abi.SectorSize
+	encoder seal.PieceEncoder
+}
+
+var _ UserAPI = &User{}
+
+func (u *User) EncodeDataToPieces(ctx context.Context, file storage.Data) (storage.Piece, []storage.Piece, error) {
+	finalPiece, pieces, err := u.encoder.EncodeDataToPieces(ctx, u.sectorSize, file)
+	// map(file) -> finalPiece ...
+	// err := PostPiecesToProvider(pieces)
+	return finalPiece, pieces, err
+}
+
+func (u *User) ReadPieceRange(
+	ctx context.Context, 
+	out io.Writer, 
+	piece storage.Piece, 
+	offset uint64, 
+	size uint64,
+) error {
+	UnpaddedSectorSize := abi.PaddedPieceSize(u.sectorSize).Unpadded()
+	DataLen := uint32(UnpaddedSectorSize) - seal.TagLen
+
+	data, err := u.getPiece(ctx, piece.Hash)
+	if err != nil {
+		return err
+	}
+	piecesHash := data.PieceHash
+
+	for data.HasPre {
+		data, err = u.getPiece(ctx, data.PreHash)
+		if err != nil {
+			return err
+		}
+		piecesHash = append(data.PieceHash, piecesHash...)
+	}
+	buf := data.Data[:]
+	maxSize := uint64(len(piecesHash)) * uint64(DataLen) + uint64(len(buf))
+
+	if offset == 0 && size == 0{
+		size = maxSize
+	}
+	if size + offset > maxSize {
+		return xerrors.Errorf("Piece Size is Out of Range [offset: %w, size:%w, max_size:%w]", offset, size, max_size)
+	}
+
+	piecesHash = piecesHash[offset/uint64(DataLen):]
+	rangePiece := RangePiece{
+		offset: offset,
+		size: size,
+		lenth: uint64(DataLen),
+	}
+	for{
+		rstart, rsize := rangePiece.nextRange()
+		if rsize == 0 {
+			break
+		}
+		if len(piecesHash) != 0 {
+			data, err := u.getPiece(ctx, piecesHash[0])
+			if err != nil {
+				return err
+			}
+			wbuf = data.Data[rstart:]
+			piecesHash = piecesHash[1:]
+		} else {
+			wbuf = buf[rstart:]
+		}
+		_, err = out.Write(wbuf[:rsize])
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (u *User) getPiece(ctx context.Context, pieceHash storage.Hash) (*storage.DecodedData, error) {
+	// GET from chian/provider
+	// buf, err := GetPieceFromProvider(pieceHash)
+	unpaddedSectorSize := abi.PaddedPieceSize(u.sectorSize).Unpadded()
+	buf := make([]byte, unpaddedSectorSize)
+
+	read, err := in.Read(buf[:])
+	if err != nil && err != io.EOF {
+		return storage.DecodedData{}, err
+	}
+
+	var data *storage.DecodedData = &storage.DecodedData{}
+	err = data.Deserialize(buf[:read])
+	return data, err
+}
+
+type RangePiece struct {
+	offset uint64
+	size uint64
+	lenth uint64
+}
+
+func (rp RangePiece) nextRange() (uint64, uint64) {
+	start := rp.offset % rp.lenth
+	size := min(rp.size, rp.lenth-rp.start)
+	rp.offset = rp.offset + size
+	rp.size = rp.size - size
+	return start, size
+}
\ No newline at end of file

build/pieces/pieces.go

 package pieces
 
 import (
-	"github.com/minio/sha256-simd"
 	"math/bits"
 
 	"golang.org/x/xerrors"
 	
+	"github.com/minio/sha256-simd"
+
 	"fil_integrate/build/fr32"
 	"fil_integrate/build/state-types/abi"
 )

build/storage/storage.go

@@ -17,6 +17,8 @@ type Data = io.Reader
 
 type Hash = [32]byte
 
+type PieceRef Hash
+
 type SectorRef struct {
 	ID        abi.SectorID
 	ProofType abi.RegisteredSealProof

seal/type.go

@@ -4,11 +4,11 @@ import (
 	"context"
 	"io"
 
-	"fil_integrate/build/state-types/abi"
 	"github.com/ipfs/go-cid"
 	"github.com/minio/blake2b-simd"
 
 	spproof "fil_integrate/build/proof"
+	"fil_integrate/build/state-types/abi"
 	"fil_integrate/build/storage"
 	"fil_integrate/build/storiface"
 	"fil_integrate/seal/basicfs"