lotus/blockstore/splitstore/splitstore_util.go

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package splitstore
import (
"encoding/binary"
"golang.org/x/xerrors"
cid "github.com/ipfs/go-cid"
mh "github.com/multiformats/go-multihash"
"github.com/filecoin-project/go-state-types/abi"
)
func epochToBytes(epoch abi.ChainEpoch) []byte {
return uint64ToBytes(uint64(epoch))
}
func bytesToEpoch(buf []byte) abi.ChainEpoch {
return abi.ChainEpoch(bytesToUint64(buf))
}
func int64ToBytes(i int64) []byte {
return uint64ToBytes(uint64(i))
}
func bytesToInt64(buf []byte) int64 {
return int64(bytesToUint64(buf))
}
func uint64ToBytes(i uint64) []byte {
buf := make([]byte, 16)
n := binary.PutUvarint(buf, i)
return buf[:n]
}
func bytesToUint64(buf []byte) uint64 {
i, _ := binary.Uvarint(buf)
return i
}
func isUnitaryObject(c cid.Cid) bool {
pre := c.Prefix()
switch pre.Codec {
case cid.FilCommitmentSealed, cid.FilCommitmentUnsealed:
return true
default:
return pre.MhType == mh.IDENTITY
}
}
func isIdentiyCid(c cid.Cid) bool {
return c.Prefix().MhType == mh.IDENTITY
}
func decodeIdentityCid(c cid.Cid) ([]byte, error) {
dmh, err := mh.Decode(c.Hash())
if err != nil {
return nil, xerrors.Errorf("error decoding identity cid %s: %w", c, err)
}
// sanity check
if dmh.Code != mh.IDENTITY {
return nil, xerrors.Errorf("error decoding identity cid %s: hash type is not identity", c)
}
return dmh.Digest, nil
}