# nghttp2_session_mem_recv

## Synopsis

#include <nghttp2/nghttp2.h>

ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in, size_t inlen)

  Processes data in as an input from the remote endpoint. The inlen indicates the number of bytes in the in.

  This function behaves like `nghttp2_session_recv()` except that it does not use `nghttp2_recv_callback` to receive data; the in is the only data for the invocation of this function. If all bytes are processed, this function returns. The other callbacks are called in the same way as they are in `nghttp2_session_recv()`.

  In the current implementation, this function always tries to processes all input data unless either an error occurs or `nghttp2_error.NGHTTP2_ERR_PAUSE` is returned from `nghttp2_on_header_callback` or `nghttp2_on_data_chunk_recv_callback`. If `nghttp2_error.NGHTTP2_ERR_PAUSE` is used, the return value includes the number of bytes which was used to produce the data or frame for the callback.

  This function returns the number of processed bytes, or one of the following negative error codes:

  `nghttp2_error.NGHTTP2_ERR_NOMEM`

    Out of memory.

  `nghttp2_error.NGHTTP2_ERR_CALLBACK_FAILURE`

    The callback function failed.

  `nghttp2_error.NGHTTP2_ERR_BAD_CLIENT_MAGIC`

    Invalid client magic was detected. This error only returns when session was configured as server and `nghttp2_option_set_no_recv_client_magic()` is not used with nonzero value.

  `nghttp2_error.NGHTTP2_ERR_FLOODED`

    Flooding was detected in this HTTP/2 session, and it must be closed. This is most likely caused by misbehaviour of peer.