nim-codex/codex/erasure/backends/leopard.nim

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2022-05-19 19:56:03 +00:00
## Nim-Codex
## Copyright (c) 2022 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import std/options
import pkg/leopard
import pkg/stew/results
import ../backend
type
LeoEncoderBackend* = ref object of EncoderBackend
encoder*: Option[LeoEncoder]
LeoDecoderBackend* = ref object of DecoderBackend
decoder*: Option[LeoDecoder]
method encode*(
self: LeoEncoderBackend,
data,
parity: var openArray[seq[byte]]): Result[void, cstring] =
if parity.len == 0:
return ok()
var encoder = if self.encoder.isNone:
self.encoder = (? LeoEncoder.init(
self.blockSize,
self.buffers,
self.parity)).some
self.encoder.get()
else:
self.encoder.get()
encoder.encode(data, parity)
method decode*(
self: LeoDecoderBackend,
data,
parity,
recovered: var openArray[seq[byte]]): Result[void, cstring] =
var decoder = if self.decoder.isNone:
self.decoder = (? LeoDecoder.init(
self.blockSize,
self.buffers,
self.parity)).some
self.decoder.get()
else:
self.decoder.get()
decoder.decode(data, parity, recovered)
method release*(self: LeoEncoderBackend) =
if self.encoder.isSome:
self.encoder.get().free()
method release*(self: LeoDecoderBackend) =
if self.decoder.isSome:
self.decoder.get().free()
func new*(
T: type LeoEncoderBackend,
blockSize,
buffers,
parity: int): T =
T(
blockSize: blockSize,
buffers: buffers,
parity: parity)
func new*(
T: type LeoDecoderBackend,
blockSize,
buffers,
parity: int): T =
T(
blockSize: blockSize,
buffers: buffers,
parity: parity)