strict-aliasing.h

#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
#define LZ4_STREAMSIZE     (LZ4_STREAMSIZE_U64 * sizeof(long long))

typedef struct { 
  union {
    struct LZ4_stream_t_internal internal;
    long long table[LZ4_STREAMSIZE_U64];
  };
} LZ4_stream_t;


typedef struct {
  U32 hashTable[HASH_SIZE_U32];
  U32 currentOffset;
  U32 initCheck;
  const BYTE* dictionary;
  BYTE* bufferStart;   /* obsolete, used for slideInputBuffer */
  U32 dictSize;
} LZ4_stream_t_internal;