90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
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// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package ipld
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/ipfs/go-cid"
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mh "github.com/multiformats/go-multihash"
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)
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// IPLD Codecs for Ethereum
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// See the authoritative document:
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// https://github.com/multiformats/multicodec/blob/master/table.csv
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const (
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RawBinary = 0x55
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MEthHeader = 0x90
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MEthHeaderList = 0x91
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MEthTxTrie = 0x92
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MEthTx = 0x93
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MEthTxReceiptTrie = 0x94
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MEthTxReceipt = 0x95
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MEthStateTrie = 0x96
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MEthAccountSnapshot = 0x97
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MEthStorageTrie = 0x98
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MBitcoinHeader = 0xb0
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MBitcoinTx = 0xb1
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)
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// rawdataToCid takes the desired codec and a slice of bytes
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// and returns the proper cid of the object.
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func rawdataToCid(codec uint64, rawdata []byte, multiHash uint64) (cid.Cid, error) {
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c, err := cid.Prefix{
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Codec: codec,
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Version: 1,
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MhType: multiHash,
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MhLength: -1,
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}.Sum(rawdata)
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if err != nil {
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return cid.Cid{}, err
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}
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return c, nil
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}
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// keccak256ToCid takes a keccak256 hash and returns its cid based on
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// the codec given.
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func keccak256ToCid(codec uint64, h []byte) cid.Cid {
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buf, err := mh.Encode(h, mh.KECCAK_256)
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if err != nil {
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panic(err)
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}
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return cid.NewCidV1(codec, mh.Multihash(buf))
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}
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// commonHashToCid takes a go-ethereum common.Hash and returns its
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// cid based on the codec given,
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func commonHashToCid(codec uint64, h common.Hash) cid.Cid {
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mhash, err := mh.Encode(h[:], mh.KECCAK_256)
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if err != nil {
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panic(err)
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}
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return cid.NewCidV1(codec, mhash)
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}
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// sha256ToCid takes a sha246 hash and returns its cid based on the
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// codec given
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func sha256ToCid(codec uint64, h []byte) cid.Cid {
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hash, err := mh.Encode(h, mh.DBL_SHA2_256)
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if err != nil {
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panic(err)
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}
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return cid.NewCidV1(codec, hash)
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}
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