return nil, errInvalidRange
	}
	return hrange, nil
}

// checkCopyPartRangeWithSize adds more check to the range string in case of
// copy object part. This API requires having specific start and end  range values
// e.g. 'bytes=3-10'. Other use cases will be rejected.
func checkCopyPartRangeWithSize(rs *HTTPRangeSpec, resourceSize int64) (err error) {
	if rs == nil {
		return nil
	}

	errorRangeString := []string{
		"bytes=10-10",
		"bytes=20-30",
	}
	for _, rangeString := range errorRangeString {
		rs, err := parseCopyPartRangeSpec(rangeString)
		if err == nil {
			err1 := checkCopyPartRangeWithSize(rs, objectSize)
			if err1 != errInvalidRangeSource {
				t.Fatalf("expected: %s, got: %s", errInvalidRangeSource, err)
			}
		} else {
			t.Fatalf("expected: %s, got: <nil>", errInvalidRangeSource)
		}
	}

	if err := enforceBucketQuotaHard(ctx, dstBucket, actualPartSize); err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// Special care for CopyObjectPart
	if partRangeErr := checkCopyPartRangeWithSize(rs, actualPartSize); partRangeErr != nil {
		writeCopyPartErr(ctx, w, partRangeErr, r.URL)
		return
	}

	// Get the object offset & length
	startOffset, length, err := rs.GetOffsetLength(actualPartSize)