Function decodeChunk

ethstorage/data_shard.go:303–330

(chunkSize uint64, bs []byte, encodeType uint64, encodeKey common.Hash)

}

func decodeChunk(chunkSize uint64, bs []byte, encodeType uint64, encodeKey common.Hash) []byte {
	if len(bs) > int(chunkSize) {
		panic("cannot decode chunk with size > CHUNK_SIZE")
	}
	if encodeType == ENCODE_KECCAK_256 {
		output := make([]byte, len(bs))
		j := 0
		for i := 0; i < len(bs); i++ {
			output[i] = bs[i] ^ encodeKey[j]
			j = j + 1
			if j >= len(encodeKey) {
				j = 0
			}
		}
		return output
	} else if encodeType == NO_ENCODE {
		output := make([]byte, len(bs))
		copy(output, bs)
		return output
	} else if encodeType == ENCODE_BLOB_POSEIDON {
		mask, _ := encoder.Encode(encodeKey, int(chunkSize))
		return UnmaskDataInPlace(bs, mask)
	} else if encodeType == ENCODE_ETHASH {
		return UnmaskDataInPlace(bs, pora.GetMaskData(0, encodeKey, len(bs), nil))
	} else {
		panic("unsupported encode type")
	}
}

var EmptyBlobCommit = make([]byte, HashSizeInContract)