src/main/java/org/apache/datasketches/vector/decomposition/PreambleUtil.java [227:234]:
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  static int getAndCheckPreLongs(final Memory mem) {
    final long cap = mem.getCapacity();
    if (cap < Long.BYTES) { throwNotBigEnough(cap, Long.BYTES); }
    final int preLongs = extractPreLongs(mem);
    final int required = Math.max(preLongs << 3, Long.BYTES);
    if (cap < required) { throwNotBigEnough(cap, required); }
    return preLongs;
  }
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src/main/java/org/apache/datasketches/vector/matrix/MatrixPreambleUtil.java [213:220]:
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  private static int getAndCheckPreLongs(final Memory mem) {
    final long cap = mem.getCapacity();
    if (cap < Long.BYTES) { throwNotBigEnough(cap, Long.BYTES); }
    final int preLongs = extractPreLongs(mem);
    final int required = Math.max(preLongs << 3, Long.BYTES);
    if (cap < required) { throwNotBigEnough(cap, required); }
    return preLongs;
  }
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