6.1.3 Common types

All strings that are to provided as input to GnuTLS functions should be in UTF-8 unless otherwise specified. Output strings are also in UTF-8 format unless otherwise specified.

When data of a fixed size are provided to GnuTLS functions then the helper structure gnutls_datum_t is often used. Its definition is shown below.

  typedef struct
  {
    unsigned char *data;
    unsigned int size;
  } gnutls_datum_t;

Other functions that require data for scattered read use a structure similar to struct iovec typically used by readv. It is shown below.

  typedef struct
  {
    void *iov_base;             /* Starting address */
    size_t iov_len;             /* Number of bytes to transfer */
  } giovec_t;