json_ref bunser()

in watchman/bser.cpp [675:743]

• 62 lines of code
• 17 McCabe index (conditional complexity)

json_ref bunser(
    const char* buf,
    const char* end,
    json_int_t* needed,
    json_error_t* jerr) {
  json_int_t ival;

  switch (buf[0]) {
    case BSER_INT8:
    case BSER_INT16:
    case BSER_INT32:
    case BSER_INT64:
      if (!bunser_int(buf, end - buf, needed, &ival)) {
        snprintf(jerr->text, sizeof(jerr->text), "invalid integer encoding");
        return nullptr;
      }
      return json_integer(ival);

    case BSER_BYTESTRING:
    case BSER_UTF8STRING: {
      const char* start;
      json_int_t len;

      if (!bunser_generic_string(buf, end - buf, needed, &start, &len)) {
        snprintf(jerr->text, sizeof(jerr->text), "invalid bytestring encoding");
        return nullptr;
      }

      return typed_string_to_json(
          start,
          len,
          buf[0] == BSER_BYTESTRING ? W_STRING_BYTE : W_STRING_UNICODE);
    }

    case BSER_REAL: {
      double dval;
      *needed = sizeof(double) + 1;
      memcpy(&dval, buf + 1, sizeof(dval));
      return json_real(dval);
    }

    case BSER_TRUE:
      *needed = 1;
      return json_true();
    case BSER_FALSE:
      *needed = 1;
      return json_false();
    case BSER_NULL:
      *needed = 1;
      return json_null();
    case BSER_ARRAY:
      return bunser_array(buf, end, needed, jerr);
    case BSER_TEMPLATE:
      return bunser_template(buf, end, needed, jerr);
    case BSER_OBJECT:
      return bunser_object(buf, end, needed, jerr);
    default:
      snprintf(
          jerr->text,
          sizeof(jerr->text),
          "invalid bser encoding type %02x",
          (int)buf[0]);
      return nullptr;
  }

#ifndef _WIN32 // It knows this is unreachable
  return nullptr;
#endif
}