bool PairsUtil::marshalPairs()

in plugins/experimental/wasm/lib/src/pairs_util.cc [40:102]

• 51 lines of code
• 12 McCabe index (conditional complexity)

bool PairsUtil::marshalPairs(const Pairs &pairs, char *buffer, size_t size) {
  if (buffer == nullptr) {
    return false;
  }

  char *pos = buffer;
  const char *end = buffer + size;

  // Write number of pairs.
  uint32_t num_pairs =
      htowasm(pairs.size(), contextOrEffectiveContext() != nullptr
                                ? contextOrEffectiveContext()->wasmVm()->usesWasmByteOrder()
                                : false);
  if (pos + sizeof(uint32_t) > end) {
    return false;
  }
  ::memcpy(pos, &num_pairs, sizeof(uint32_t));
  pos += sizeof(uint32_t);

  for (const auto &p : pairs) {
    // Write name length.
    uint32_t name_len =
        htowasm(p.first.size(), contextOrEffectiveContext() != nullptr
                                    ? contextOrEffectiveContext()->wasmVm()->usesWasmByteOrder()
                                    : false);
    if (pos + sizeof(uint32_t) > end) {
      return false;
    }
    ::memcpy(pos, &name_len, sizeof(uint32_t));
    pos += sizeof(uint32_t);

    // Write value length.
    uint32_t value_len =
        htowasm(p.second.size(), contextOrEffectiveContext() != nullptr
                                     ? contextOrEffectiveContext()->wasmVm()->usesWasmByteOrder()
                                     : false);
    if (pos + sizeof(uint32_t) > end) {
      return false;
    }
    ::memcpy(pos, &value_len, sizeof(uint32_t));
    pos += sizeof(uint32_t);
  }

  for (const auto &p : pairs) {
    // Write name.
    if (pos + p.first.size() + 1 > end) {
      return false;
    }
    ::memcpy(pos, p.first.data(), p.first.size());
    pos += p.first.size();
    *pos++ = '\0'; // NULL-terminated string.

    // Write value.
    if (pos + p.second.size() + 1 > end) {
      return false;
    }
    ::memcpy(pos, p.second.data(), p.second.size());
    pos += p.second.size();
    *pos++ = '\0'; // NULL-terminated string.
  }

  return pos == end;
}