nimbus-eth2/beacon_chain/spec/ssz_codec.nim

54 lines
2.1 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2022 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
{.pragma: raisesssz, raises: [Defect, MalformedSszError, SszSizeMismatchError].}
import
std/[typetraits],
ssz_serialization/codec,
./datatypes/base
export codec, base, typetraits
# Coding and decoding of SSZ to spec-specific types
template toSszType*(v: Slot|Epoch|SyncCommitteePeriod): auto = uint64(v)
template toSszType*(v: BlsCurveType): auto = toRaw(v)
template toSszType*(v: ForkDigest|GraffitiBytes): auto = distinctBase(v)
template toSszType*(v: Version): auto = distinctBase(v)
template toSszType*(v: JustificationBits): auto = distinctBase(v)
func fromSszBytes*(T: type GraffitiBytes, data: openArray[byte]): T {.raisesssz.} =
if data.len != sizeof(result):
raiseIncorrectSize T
copyMem(result.addr, unsafeAddr data[0], sizeof(result))
template fromSszBytes*(T: type Slot, bytes: openArray[byte]): T =
T fromSszBytes(uint64, bytes)
template fromSszBytes*(T: type Epoch, bytes: openArray[byte]): T =
T fromSszBytes(uint64, bytes)
template fromSszBytes*(T: type SyncCommitteePeriod, bytes: openArray[byte]): T =
T fromSszBytes(uint64, bytes)
func fromSszBytes*(T: type ForkDigest, bytes: openArray[byte]): T {.raisesssz.} =
if bytes.len != sizeof(result):
raiseIncorrectSize T
copyMem(result.addr, unsafeAddr bytes[0], sizeof(result))
func fromSszBytes*(T: type Version, bytes: openArray[byte]): T {.raisesssz.} =
if bytes.len != sizeof(result):
raiseIncorrectSize T
copyMem(result.addr, unsafeAddr bytes[0], sizeof(result))
func fromSszBytes*(T: type JustificationBits, bytes: openArray[byte]): T {.raisesssz.} =
if bytes.len != sizeof(result):
raiseIncorrectSize T
copyMem(result.addr, unsafeAddr bytes[0], sizeof(result))