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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package commp | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "math/bits" | ||
|
|
||
| "github.com/ipfs/go-cid" | ||
| "golang.org/x/xerrors" | ||
|
|
||
| ffi "github.com/filecoin-project/filecoin-ffi" | ||
| "github.com/filecoin-project/go-padreader" | ||
| "github.com/filecoin-project/go-state-types/abi" | ||
|
|
||
| "github.com/filecoin-project/lotus/api" | ||
| "github.com/filecoin-project/lotus/extern/sector-storage/ffiwrapper" | ||
| "github.com/filecoin-project/lotus/extern/sector-storage/zerocomm" | ||
| ) | ||
|
|
||
| const commPBufPad = abi.PaddedPieceSize(8 << 20) | ||
| const CommPBuf = abi.UnpaddedPieceSize(commPBufPad - (commPBufPad / 128)) // can't use .Unpadded() for const | ||
|
|
||
| type Writer struct { | ||
| len int64 | ||
| buf [CommPBuf]byte | ||
| leaves []cid.Cid | ||
| } | ||
|
|
||
| func (w *Writer) Write(p []byte) (int, error) { | ||
| n := len(p) | ||
| for len(p) > 0 { | ||
| buffered := int(w.len % int64(len(w.buf))) | ||
| toBuffer := len(w.buf) - buffered | ||
| if toBuffer > len(p) { | ||
| toBuffer = len(p) | ||
| } | ||
|
|
||
| copied := copy(w.buf[buffered:], p[:toBuffer]) | ||
| p = p[copied:] | ||
| w.len += int64(copied) | ||
|
|
||
| if copied > 0 && w.len%int64(len(w.buf)) == 0 { | ||
| leaf, err := ffiwrapper.GeneratePieceCIDFromFile(abi.RegisteredSealProof_StackedDrg32GiBV1, bytes.NewReader(w.buf[:]), CommPBuf) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| w.leaves = append(w.leaves, leaf) | ||
| } | ||
| } | ||
| return n, nil | ||
| } | ||
|
|
||
| func (w *Writer) Sum() (api.DataCIDSize, error) { | ||
| // process last non-zero leaf if exists | ||
| lastLen := w.len % int64(len(w.buf)) | ||
| rawLen := w.len | ||
|
|
||
| // process remaining bit of data | ||
| if lastLen != 0 { | ||
| if len(w.leaves) != 0 { | ||
| copy(w.buf[lastLen:], make([]byte, int(int64(CommPBuf)-lastLen))) | ||
| lastLen = int64(CommPBuf) | ||
| } | ||
|
|
||
| r, sz := padreader.New(bytes.NewReader(w.buf[:lastLen]), uint64(lastLen)) | ||
| p, err := ffiwrapper.GeneratePieceCIDFromFile(abi.RegisteredSealProof_StackedDrg32GiBV1, r, sz) | ||
| if err != nil { | ||
| return api.DataCIDSize{}, err | ||
| } | ||
|
|
||
| if sz < CommPBuf { // special case for pieces smaller than 16MiB | ||
| return api.DataCIDSize{ | ||
| PayloadSize: w.len, | ||
| PieceSize: sz.Padded(), | ||
| PieceCID: p, | ||
| }, nil | ||
| } | ||
|
|
||
| w.leaves = append(w.leaves, p) | ||
| } | ||
|
|
||
| // pad with zero pieces to power-of-two size | ||
| fillerLeaves := (1 << (bits.Len(uint(len(w.leaves) - 1)))) - len(w.leaves) | ||
| for i := 0; i < fillerLeaves; i++ { | ||
| w.leaves = append(w.leaves, zerocomm.ZeroPieceCommitment(CommPBuf)) | ||
| } | ||
|
|
||
| if len(w.leaves) == 1 { | ||
| return api.DataCIDSize{ | ||
| PayloadSize: rawLen, | ||
| PieceSize: abi.PaddedPieceSize(len(w.leaves)) * commPBufPad, | ||
| PieceCID: w.leaves[0], | ||
| }, nil | ||
| } | ||
|
|
||
| pieces := make([]abi.PieceInfo, len(w.leaves)) | ||
| for i, leaf := range w.leaves { | ||
| pieces[i] = abi.PieceInfo{ | ||
| Size: commPBufPad, | ||
| PieceCID: leaf, | ||
| } | ||
| } | ||
|
|
||
| p, err := ffi.GenerateUnsealedCID(abi.RegisteredSealProof_StackedDrg32GiBV1, pieces) | ||
| if err != nil { | ||
| return api.DataCIDSize{}, xerrors.Errorf("generating unsealed CID: %w", err) | ||
| } | ||
|
|
||
| return api.DataCIDSize{ | ||
| PayloadSize: rawLen, | ||
| PieceSize: abi.PaddedPieceSize(len(w.leaves)) * commPBufPad, | ||
| PieceCID: p, | ||
| }, nil | ||
| } |
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