Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | 33x 33x 33x 33x 33x 33x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 33x 8x 8x 8x 8x 8x | import { Binary } from 'cafe-utility'
import { Bytes } from './bytes'
import { Reference } from './typed-bytes'
export const SWARM_MANIFEST_CODEC = 0xfa
export const SWARM_FEED_CODEC = 0xfb
const CODEC_TABLE: Record<number, string | undefined> = {
[SWARM_MANIFEST_CODEC]: 'manifest',
[SWARM_FEED_CODEC]: 'feed',
}
export type DecodedCID = {
type: 'feed' | 'manifest'
reference: Reference
}
export function convertReferenceToCid(reference: string | Uint8Array | Bytes, type: 'feed' | 'manifest'): string {
reference = new Reference(reference)
const base32 = 'b'
const version = new Uint8Array([1])
const codec = new Uint8Array([type === 'feed' ? SWARM_FEED_CODEC : SWARM_MANIFEST_CODEC])
const unknown = new Uint8Array([1])
const sha256 = new Uint8Array([27])
const size = new Uint8Array([32])
const header = Binary.uint8ArrayToBase32(Binary.concatBytes(version, codec, unknown, sha256, size)).replace(
/\=+$/,
'',
)
const hash = reference.toBase32().replace(/\=+$/, '')
return `${base32}${header}${hash}`.toLowerCase()
}
export function convertCidToReference(cid: string): DecodedCID {
const bytes = Binary.base32ToUint8Array(cid.toUpperCase().slice(1))
const codec = bytes[1]
Iif (!CODEC_TABLE[codec]) {
throw new Error('Unknown codec')
}
const reference = new Reference(bytes.slice(-32))
return {
type: CODEC_TABLE[codec] as 'feed' | 'manifest',
reference,
}
}
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