66 lines
1.4 KiB
Nim
66 lines
1.4 KiB
Nim
## Nim-Dagger
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## Copyright (c) 2021 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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{.push raises: [Defect].}
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import pkg/libp2p
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import pkg/stew/byteutils
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import pkg/questionable
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import pkg/questionable/results
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import ./errors
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const
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BlockSize* = 4096 # file chunk read size
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type
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Block* = object of RootObj
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cid*: Cid
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data*: seq[byte]
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proc `$`*(b: Block): string =
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result &= "cid: " & $b.cid
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result &= "\ndata: " & string.fromBytes(b.data)
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func init*(
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T: type Block,
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data: openArray[byte] = [],
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version = CIDv1,
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mcodec = multiCodec("sha2-256"),
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codec = multiCodec("raw")): ?!T =
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let
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hash = ? MultiHash.digest($mcodec, data).mapFailure
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cid = ? Cid.init(version, codec, hash).mapFailure
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# TODO: If the hash is `>=` to the data,
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# use the Cid as a container!
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Block(
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cid: cid,
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data: @data).success
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func init*(
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T: type Block,
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cid: Cid,
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data: openArray[byte],
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verify: bool = true): ?!T =
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let
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mhash = ? cid.mhash.mapFailure
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b = ? Block.init(
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data = @data,
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version = cid.cidver,
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codec = cid.mcodec,
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mcodec = mhash.mcodec)
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if verify and cid != b.cid:
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return failure "Cid's don't match!"
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success b
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