Method readChunkWith

ethstorage/data_shard.go:130–144

readChunkWith read the encoded chunk from storage with a decoder.

(kvIdx uint64, chunkIdx uint64, decoder func([]byte, uint64) []byte)

// readChunkWith read the encoded chunk from storage with a decoder.
func (ds *DataShard) readChunkWith(kvIdx uint64, chunkIdx uint64, decoder func([]byte, uint64) []byte) ([]byte, error) {
	if !ds.Contains(kvIdx) {
		return nil, fmt.Errorf("kv not found")
	}
	if chunkIdx >= ds.chunksPerKv {
		return nil, fmt.Errorf("chunkIdx out of range, chunkIdx： %d vs chunksPerKv %d", chunkIdx, ds.chunksPerKv)
	}
	idx := kvIdx*ds.chunksPerKv + chunkIdx
	data, err := ds.readChunk(idx, int(ds.chunkSize))
	if err != nil {
		return nil, err
	}
	data = decoder(data, idx)
	return data, nil
}

// ReadEncoded read the encoded data from storage and return it.
func (ds *DataShard) ReadEncoded(kvIdx uint64, readLen int) ([]byte, error) {