Function encodeShareData

src/utils/shareDataCodec.ts:137–203

(
  manifestUrlOrManifest: string | ColmapManifest,
  viewState: CameraViewState | null,
  config?: ShareConfig | null
)

 * bit 4 = 32-bit little-endian length fields instead of legacy 16-bit lengths.
 */
export function encodeShareData(
  manifestUrlOrManifest: string | ColmapManifest,
  viewState: CameraViewState | null,
  config?: ShareConfig | null
): string {
  const isInlineManifest = typeof manifestUrlOrManifest !== 'string';
  const dataString = isInlineManifest
    ? JSON.stringify(manifestUrlOrManifest)
    : manifestUrlOrManifest;
  const dataBytes = new TextEncoder().encode(dataString);
  const dataLength = dataBytes.length;

  const hasCamera = viewState !== null;
  const hasConfig = config !== null && config !== undefined;
  const configBytes = hasConfig ? new TextEncoder().encode(JSON.stringify(config)) : null;
  const configLength = configBytes?.length ?? 0;
  const usesWideLengths = dataLength > UINT16_MAX || configLength > UINT16_MAX;
  const lengthFieldBytes = getLengthFieldBytes(usesWideLengths);

  const payloadLength = lengthFieldBytes + dataLength + (hasCamera ? 72 : 0) + (hasConfig ? lengthFieldBytes + configLength : 0);
  const payloadBuffer = new ArrayBuffer(payloadLength);
  const payloadView = new DataView(payloadBuffer);
  const payloadBytes = new Uint8Array(payloadBuffer);

  let offset = 0;
  offset = writeShareDataLength(payloadView, offset, dataLength, lengthFieldBytes);

  payloadBytes.set(dataBytes, offset);
  offset += dataLength;

  if (hasCamera && viewState) {
    payloadBytes.set(encodeCameraStateBinary(viewState), offset);
    offset += 72;
  }

  if (hasConfig && configBytes) {
    offset = writeShareDataLength(payloadView, offset, configLength, lengthFieldBytes);
    payloadBytes.set(configBytes, offset);
  }

  let finalPayload: Uint8Array = payloadBytes;
  let isCompressed = false;

  if (deflateSync) {
    try {
      const compressed = deflateSync(payloadBytes, { level: 9 });
      if (compressed.length < payloadBytes.length) {
        finalPayload = compressed;
        isCompressed = true;
      }
    } catch {
      finalPayload = payloadBytes;
    }
  }

  const flags =
    (hasCamera ? SHARE_DATA_FLAG_CAMERA : 0) |
    (hasConfig ? SHARE_DATA_FLAG_CONFIG : 0) |