49 lines
807 B
Go
49 lines
807 B
Go
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package cid
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import (
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"encoding/binary"
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mh "github.com/jbenet/go-multihash"
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mbase "github.com/multiformats/go-multibase"
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)
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type Cid struct {
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Version uint64
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Type uint64
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Hash mh.Multihash
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}
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func Decode(v string) (*Cid, error) {
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_, data, err := mbase.Decode(v)
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if err != nil {
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return nil, err
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}
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return Cast(data)
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}
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func Cast(data []byte) (*Cid, error) {
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vers, n := binary.Uvarint(data)
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codec, cn := binary.Uvarint(data[n:])
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rest := data[n+cn:]
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h, err := mh.Cast(rest)
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if err != nil {
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return nil, err
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}
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return &Cid{
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Version: vers,
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Type: codec,
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Hash: h,
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}, nil
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}
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func (c *Cid) Bytes() []byte {
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buf := make([]byte, 8+len(c.Hash))
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n := binary.PutUvarint(buf, c.Version)
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n += binary.PutUvarint(buf[n:], c.Type)
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copy(buf[n:], c.Hash)
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return buf[:n+len(c.Hash)]
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}
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