LZMA_END_POS_MODEL_INDEX
#define LZMA_NUM_FULL_DISTANCES (1 << (LZMA_END_POS_MODEL_INDEX >> 1))
+ LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX)
if (pos_slot < LZMA_END_POS_MODEL_INDEX) {