52 lines
1.7 KiB
JavaScript
52 lines
1.7 KiB
JavaScript
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import { BeeError } from "../utils/error.js";
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import { bmtHash } from "./bmt.js";
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import { assertFlexBytes, bytesEqual, flexBytesAtOffset } from "../utils/bytes.js";
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import { serializeBytes } from "./serialize.js";
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import { makeSpan, SPAN_SIZE } from "./span.js";
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export const MIN_PAYLOAD_SIZE = 1;
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export const MAX_PAYLOAD_SIZE = 4096;
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const CAC_SPAN_OFFSET = 0;
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const CAC_PAYLOAD_OFFSET = CAC_SPAN_OFFSET + SPAN_SIZE;
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/**
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* Creates a content addressed chunk and verifies the payload size.
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*
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* @param payloadBytes the data to be stored in the chunk
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*/
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export function makeContentAddressedChunk(payloadBytes) {
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const span = makeSpan(payloadBytes.length);
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assertFlexBytes(payloadBytes, MIN_PAYLOAD_SIZE, MAX_PAYLOAD_SIZE);
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const data = serializeBytes(span, payloadBytes);
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return {
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data,
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span: () => span,
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payload: () => flexBytesAtOffset(data, CAC_PAYLOAD_OFFSET, MIN_PAYLOAD_SIZE, MAX_PAYLOAD_SIZE),
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address: () => bmtHash(data)
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};
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}
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/**
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* Type guard for valid content addressed chunk data
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*
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* @param data The chunk data
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* @param chunkAddress The address of the chunk
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*/
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export function isValidChunkData(data, chunkAddress) {
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if (!(data instanceof Uint8Array)) return false;
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const address = bmtHash(data);
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return bytesEqual(address, chunkAddress);
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}
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/**
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* Asserts if data are representing given address of its chunk.
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*
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* @param data The chunk data
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* @param chunkAddress The address of the chunk
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*
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* @returns a valid content addressed chunk or throws error
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*/
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export function assertValidChunkData(data, chunkAddress) {
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if (!isValidChunkData(data, chunkAddress)) {
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throw new BeeError('Address of content address chunk does not match given data!');
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}
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}
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