Method send_write

libminifi/include/utils/HTTPClient.h:223–254

   */

  static size_t send_write(char * data, size_t size, size_t nmemb, void * p) {
    try {
      if (p == nullptr) {
        return CALLBACK_ABORT;
      }
      HTTPUploadCallback *callback = reinterpret_cast<HTTPUploadCallback*>(p);
      if (callback->stop) {
        return CALLBACK_ABORT;
      }
      size_t buffer_size = callback->ptr->getBufferSize();
      if (callback->getPos() <= buffer_size) {
        size_t len = buffer_size - callback->pos;
        if (len <= 0) {
          return 0;
        }
        char *ptr = callback->ptr->getBuffer(callback->getPos());

        if (ptr == nullptr) {
          return 0;
        }
        if (len > size * nmemb)
          len = size * nmemb;
        memcpy(data, ptr, len);
        callback->pos += len;
        callback->ptr->seek(callback->getPos());
        return len;
      }
      return 0;
    } catch (...) {
      return CALLBACK_ABORT;
    }
  }

  static int seek_callback(void *p, int64_t offset, int) {
    try {