ability to disable mmap + struct to manage FIO dictionary

programs/fileio_types.h

@@ -69,7 +69,15 @@ typedef struct FIO_prefs_s {
     int contentSize;
     int allowBlockDevices;
     int passThrough;
-    int mmapDict;
+    ZSTD_paramSwitch_e mmapDict;
 } FIO_prefs_t;
 
+typedef enum {FIO_mallocDict, FIO_mmapDict} FIO_dictBufferType_t;
+
+typedef struct {
+    void* dictBuffer;
+    size_t dictBufferSize;
+    FIO_dictBufferType_t dictBufferType;
+} FIO_Dict_t;
+
 #endif /* FILEIO_TYPES_HEADER */