@ethersphere/bee-js/dist/mjs/chunk/cac.js

Javascript client for Bee

import { Binary } from 'cafe-utility';
import { Bytes } from "../utils/bytes.js";
import { Span } from "../utils/typed-bytes.js";
import { calculateChunkAddress } from "./bmt.js";
export const MIN_PAYLOAD_SIZE = 1;
export const MAX_PAYLOAD_SIZE = 4096;
const ENCODER = new TextEncoder();
/**
 * Creates a content addressed chunk and verifies the payload size.
 *
 * @param payloadBytes the data to be stored in the chunk
 */
export function makeContentAddressedChunk(payloadBytes) {
  if (!(payloadBytes instanceof Uint8Array)) {
    payloadBytes = ENCODER.encode(payloadBytes);
  }
  if (payloadBytes.length < MIN_PAYLOAD_SIZE || payloadBytes.length > MAX_PAYLOAD_SIZE) {
    throw new RangeError(`payload size ${payloadBytes.length} exceeds limits [${MIN_PAYLOAD_SIZE}, ${MAX_PAYLOAD_SIZE}]`);
  }
  const span = Span.fromBigInt(BigInt(payloadBytes.length));
  const data = Binary.concatBytes(span.toUint8Array(), payloadBytes);
  return {
    data,
    span,
    payload: Bytes.fromSlice(data, Span.LENGTH),
    address: calculateChunkAddress(data)
  };
}
export function asContentAddressedChunk(chunkBytes) {
  if (chunkBytes.length < MIN_PAYLOAD_SIZE + Span.LENGTH || chunkBytes.length > MAX_PAYLOAD_SIZE + Span.LENGTH) {
    throw new RangeError(`chunk size ${chunkBytes.length} exceeds limits [${MIN_PAYLOAD_SIZE + Span.LENGTH}, ${Span.LENGTH}]`);
  }
  const span = Span.fromSlice(chunkBytes, 0);
  const data = Binary.concatBytes(span.toUint8Array(), chunkBytes.slice(Span.LENGTH));
  return {
    data,
    span,
    payload: Bytes.fromSlice(data, Span.LENGTH),
    address: calculateChunkAddress(data)
  };
}