Function zstd_sys::ZDICT_optimizeTrainFromBuffer_cover

pub unsafe extern "C" fn ZDICT_optimizeTrainFromBuffer_cover(
    dictBuffer: *mut c_void,
    dictBufferCapacity: usize,
    samplesBuffer: *const c_void,
    samplesSizes: *const usize,
    nbSamples: c_uint,
    parameters: *mut ZDICT_cover_params_t,
) -> usize

ZDICT_optimizeTrainFromBuffer_cover(): The same requirements as above hold for all the parameters except parameters. This function tries many parameter combinations and picks the best parameters. *parameters is filled with the best parameters found, dictionary constructed with those parameters is stored in dictBuffer.

All of the parameters d, k, steps are optional. If d is non-zero then we don’t check multiple values of d, otherwise we check d = {6, 8}. if steps is zero it defaults to its default value. If k is non-zero then we don’t check multiple values of k, otherwise we check steps values in [50, 2000].

@return: size of dictionary stored into dictBuffer (<= dictBufferCapacity) or an error code, which can be tested with ZDICT_isError(). On success *parameters contains the parameters selected. See ZDICT_trainFromBuffer() for details on failure modes. Note: ZDICT_optimizeTrainFromBuffer_cover() requires about 8 bytes of memory for each input byte and additionally another 5 bytes of memory for each byte of memory for each thread.