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fix CID utils for lock location #111

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fix CID utils for lock location #111

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37 changes: 1 addition & 36 deletions dmap.js
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Original file line number Diff line number Diff line change
@@ -1,8 +1,7 @@
const ebnf = require('ebnf')
const ethers = require('ethers')
const multiformats = require('multiformats')

const pack = require('./pack/premap.dpack.json')
const pack = require('./pack/dmap_full_ethereum.dpack.json')
const artifact = require('./pack/Dmap.json')

const abi = artifact.abi
Expand All @@ -14,7 +13,6 @@ const need =(b,s)=> b || fail(s)

const coder = ethers.utils.defaultAbiCoder
const keccak256 = ethers.utils.keccak256
const prefLenIndex = 2

module.exports = lib = {}

Expand Down Expand Up @@ -98,36 +96,3 @@ lib.walk = async (dmap, path) => {
}
return {meta, data}
}

lib.prepareCID = (cidStr, lock) => {
const cid = multiformats.CID.parse(cidStr)
need(cid.multihash.size <= 32, `Hash exceeds 256 bits`)
const prefixLen = cid.byteLength - cid.multihash.size
const meta = new Uint8Array(32).fill(0)
const data = new Uint8Array(32).fill(0)

data.set(cid.bytes.slice(-cid.multihash.size), 32 - cid.multihash.size)
meta.set(cid.bytes.slice(0, prefixLen), 32 - prefixLen)
if (lock) meta[0] |= lib.FLAG_LOCK
meta[prefLenIndex] = prefixLen
return [meta, data]
}

lib.unpackCID = (metaStr, dataStr) => {
const meta = Buffer.from(metaStr.slice(2), 'hex')
const data = Buffer.from(dataStr.slice(2), 'hex')
const prefixLen = meta[prefLenIndex]
const specs = multiformats.CID.inspectBytes(meta.slice(-prefixLen))
const hashLen = specs.digestSize
const cidBytes = new Uint8Array(prefixLen + hashLen)

cidBytes.set(meta.slice(-prefixLen), 0)
cidBytes.set(data.slice(32 - hashLen), prefixLen)
const cid = multiformats.CID.decode(cidBytes)
return cid.toString()
}

lib.readCID = async (dmap, path) => {
const packed = await lib.walk(dmap, path)
return lib.unpackCID(packed.meta, packed.data)
}
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