Function test_invalid_checksum

lib/cpp/test/ZlibTest.cpp:250–285

}

void test_invalid_checksum(const boost::shared_array<uint8_t> buf, uint32_t buf_len) {
  // Verify checksum checking.
  shared_ptr<TMemoryBuffer> membuf(new TMemoryBuffer());
  shared_ptr<TZlibTransport> zlib_trans(new TZlibTransport(membuf));
  zlib_trans->write(buf.get(), buf_len);
  zlib_trans->finish();
  string tmp_buf;
  membuf->appendBufferToString(tmp_buf);
  // Modify a byte at the end of the buffer (part of the checksum).
  // On rare occasions, modifying a byte in the middle of the buffer
  // isn't caught by the checksum.
  //
  // (This happens especially often for the uniform buffer.  The
  // re-inflated data is correct, however.  I suspect in this case that
  // we're more likely to modify bytes that are part of zlib metadata
  // instead of the actual compressed data.)
  //
  // I've also seen some failure scenarios where a checksum failure isn't
  // reported, but zlib keeps trying to decode past the end of the data.
  // (When this occurs, verifyChecksum() throws an exception indicating
  // that the end of the data hasn't been reached.)  I haven't seen this
  // error when only modifying checksum bytes.
  int index = static_cast<int>(tmp_buf.size() - 1);
  tmp_buf[index]++;
  membuf->resetBuffer(const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(tmp_buf.data())),
                      static_cast<uint32_t>(tmp_buf.length()));

  boost::shared_array<uint8_t> mirror(new uint8_t[buf_len]);
  try {
    zlib_trans->readAll(mirror.get(), buf_len);
    zlib_trans->verifyChecksum();
    BOOST_ERROR("verifyChecksum() did not report an error");
  } catch (TZlibTransportException& ex) {
    BOOST_CHECK_EQUAL(ex.getType(), TTransportException::INTERNAL_ERROR);
  }
}

void test_write_after_flush(const boost::shared_array<uint8_t> buf, uint32_t buf_len) {
  // write some data