50 lines
1.5 KiB
TypeScript
50 lines
1.5 KiB
TypeScript
|
import errCode from 'err-code'
|
||
|
|
import * as mh from 'multiformats/hashes/digest'
|
||
|
|
import { CustomProgressEvent } from 'progress-events'
|
||
|
|
import extractDataFromBlock from '../utils/extract-data-from-block.js'
|
||
|
|
import validateOffsetAndLength from '../utils/validate-offset-and-length.js'
|
||
|
|
import type { ExporterOptions, Resolver, ExportProgress } from '../index.js'
|
||
|
|
|
||
|
|
const rawContent = (node: Uint8Array): ((options?: ExporterOptions) => AsyncGenerator<Uint8Array, void, undefined>) => {
|
||
|
|
async function * contentGenerator (options: ExporterOptions = {}): AsyncGenerator<Uint8Array, void, undefined> {
|
||
|
|
const {
|
||
|
|
start,
|
||
|
|
end
|
||
|
|
} = validateOffsetAndLength(node.length, options.offset, options.length)
|
||
|
|
|
||
|
|
const buf = extractDataFromBlock(node, 0n, start, end)
|
||
|
|
|
||
|
|
options.onProgress?.(new CustomProgressEvent<ExportProgress>('unixfs:exporter:progress:identity', {
|
||
|
|
bytesRead: BigInt(buf.byteLength),
|
||
|
|
totalBytes: end - start,
|
||
|
|
fileSize: BigInt(node.byteLength)
|
||
|
|
}))
|
||
|
|
|
||
|
|
yield buf
|
||
|
|
}
|
||
|
|
|
||
|
|
return contentGenerator
|
||
|
|
}
|
||
|
|
|
||
|
|
const resolve: Resolver = async (cid, name, path, toResolve, resolve, depth, blockstore, options) => {
|
||
|
|
if (toResolve.length > 0) {
|
||
|
|
throw errCode(new Error(`No link named ${path} found in raw node ${cid}`), 'ERR_NOT_FOUND')
|
||
|
|
}
|
||
|
|
const buf = mh.decode(cid.multihash.bytes)
|
||
|
|
|
||
|
|
return {
|
||
|
|
entry: {
|
||
|
|
type: 'identity',
|
||
|
|
name,
|
||
|
|
path,
|
||
|
|
cid,
|
||
|
|
content: rawContent(buf.digest),
|
||
|
|
depth,
|
||
|
|
size: BigInt(buf.digest.length),
|
||
|
|
node: buf.digest
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
export default resolve
|