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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package head | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "fmt" | ||
|
|
||
| "github.com/ipld/go-ipld-prime" | ||
| "github.com/ipld/go-ipld-prime/codec/dagcbor" | ||
| "github.com/ipld/go-ipld-prime/node/basicnode" | ||
| ) | ||
|
|
||
| func Marshal(head []ipld.Link) ([]byte, error) { | ||
| np := basicnode.Prototype.Any | ||
| nb := np.NewBuilder() | ||
| la, err := nb.BeginList(int64(len(head))) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for _, l := range head { | ||
| err := la.AssembleValue().AssignLink(l) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| err = la.Finish() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| n := nb.Build() | ||
| buf := bytes.NewBuffer([]byte{}) | ||
| err = dagcbor.Encode(n, buf) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("CBOR encoding: %w", err) | ||
| } | ||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| func Unmarshal(b []byte) ([]ipld.Link, error) { | ||
| var head []ipld.Link | ||
|
|
||
| np := basicnode.Prototype.List | ||
| nb := np.NewBuilder() | ||
| err := dagcbor.Decode(nb, bytes.NewReader(b)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("decoding shard: %w", err) | ||
| } | ||
| n := nb.Build() | ||
|
|
||
| values := n.ListIterator() | ||
| if values == nil { | ||
| return nil, errors.New("not a list") | ||
| } | ||
| for { | ||
| if values.Done() { | ||
| break | ||
| } | ||
| _, n, err := values.Next() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("iterating links: %w", err) | ||
| } | ||
| link, err := n.AsLink() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("decoding link: %w", err) | ||
| } | ||
| head = append(head, link) | ||
| } | ||
|
|
||
| return head, nil | ||
| } |
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