Refactoring and benchmark without dictionary

contrib/experimental_dict_builders/randomDictBuilder/random.h

@@ -0,0 +1,29 @@
+#include <stdio.h>  /* fprintf */
+#include <stdlib.h> /* malloc, free, qsort */
+#include <string.h> /* memset */
+#include <time.h>   /* clock */
+#include "zstd_internal.h" /* includes zstd.h */
+#ifndef ZDICT_STATIC_LINKING_ONLY
+#define ZDICT_STATIC_LINKING_ONLY
+#endif
+#include "zdict.h"
+
+
+
+typedef struct {
+    unsigned k; /* Segment size : constraint: 0 < k : Reasonable range [16, 2048+]; Default to 200 */
+    ZDICT_params_t zParams;
+} ZDICT_random_params_t;
+
+
+/*! ZDICT_trainFromBuffer_random():
+ *  Train a dictionary from an array of samples.
+ *  Samples must be stored concatenated in a single flat buffer `samplesBuffer`,
+ *  supplied with an array of sizes `samplesSizes`, providing the size of each sample, in order.
+ *  The resulting dictionary will be saved into `dictBuffer`.
+ * @return: size of dictionary stored into `dictBuffer` (<= `dictBufferCapacity`)
+ *          or an error code, which can be tested with ZDICT_isError().
+ */
+ZDICTLIB_API size_t ZDICT_trainFromBuffer_random( void *dictBuffer, size_t dictBufferCapacity,
+    const void *samplesBuffer, const size_t *samplesSizes, unsigned nbSamples,
+    ZDICT_random_params_t parameters);