getPartialObject method

Future<MinioByteStream> getPartialObject(String bucket, String object, [ int? offset, int? length, ])

get a readable stream of the partial object content.

Implementation

Future<MinioByteStream> getPartialObject(
  String bucket,
  String object, [
  int? offset,
  int? length,
]) async {
  assert(offset == null || offset >= 0);
  assert(length == null || length > 0);

  MinioInvalidBucketNameError.check(bucket);
  MinioInvalidObjectNameError.check(object);

  String? range;
  if (offset != null || length != null) {
    if (offset != null) {
      range = 'bytes=$offset-';
    } else {
      range = 'bytes=0-';
      offset = 0;
    }
    if (length != null) {
      range += '${(length + offset) - 1}';
    }
  }

  final headers = range != null ? {'range': range} : null;
  final expectedStatus = range != null ? 206 : 200;

  final resp = await _client.requestStream(
    method: 'GET',
    bucket: bucket,
    object: object,
    headers: headers,
  );

  await validateStreamed(resp, expect: expectedStatus);

  return MinioByteStream.fromStream(
    stream: resp.stream,
    contentLength: resp.contentLength,
  );
}