Function deflateSetDictionary 

pub unsafe extern "C" fn deflateSetDictionary(
    strm: z_streamp,
    dictionary: *const Bytef,
    dictLength: uInt,
) -> c_int

Initializes the compression dictionary from the given byte sequence without producing any compressed output.

This function may be called after deflateInit_, deflateInit2_ or deflateReset) and before the first call of deflate.

Returns

• Z_OK if success
• Z_STREAM_ERROR if the stream state was inconsistent

Safety

The caller must guarantee that

• Either
  • strm is NULL
  • strm satisfies the requirements of &mut *strm and was initialized with deflateInit_ or similar
• Either
  • dictionary is NULL
  • dictionary and dictLength satisfy the requirements of core::slice::from_raw_parts_mut::<u8>