[test-suite] Work around undefined behaviour in lencod

[ostannard]

Summary

The NUM_BLOCK_TYPES macro is defined to 10, but the arrays in ctx_tables.h only have 8 elements in the relevant dimension, so this was causing out of bounds array accesses, and segfaults if we were (un)lucky.

This is almost exactly the same change as was made to ldecod in D74770.

[kristof.beyls]

Assuming there is no change in output, LGTM.

MultiSource/Applications/JM/lencod/context_ini.c

   BIARI_CTX_INIT1 (   NUM_TRANSFORM_SIZE_CTX,  mc->transform_size_contexts,    INIT_TRANSFORM_SIZE,   img->model_number);
 
   //--- texture coding contexts ---
-  BIARI_CTX_INIT1 (                 NUM_IPR_CTX,  tc->ipr_contexts,     INIT_IPR,       img->model_number);
-  BIARI_CTX_INIT1 (                 NUM_CIPR_CTX, tc->cipr_contexts,    INIT_CIPR,      img->model_number);
-  BIARI_CTX_INIT2 (3,               NUM_CBP_CTX,  tc->cbp_contexts,     INIT_CBP,       img->model_number);
-  BIARI_CTX_INIT2 (8,               NUM_BCBP_CTX, tc->bcbp_contexts,    INIT_BCBP,      img->model_number);
-  BIARI_CTX_INIT2 (NUM_BLOCK_TYPES, NUM_MAP_CTX,  tc->map_contexts,     INIT_MAP,       img->model_number);
-  BIARI_CTX_INIT2 (NUM_BLOCK_TYPES, NUM_LAST_CTX, tc->last_contexts,    INIT_LAST,      img->model_number);
-  BIARI_CTX_INIT2 (NUM_BLOCK_TYPES, NUM_ONE_CTX,  tc->one_contexts,     INIT_ONE,       img->model_number);
-  BIARI_CTX_INIT2 (NUM_BLOCK_TYPES, NUM_ABS_CTX,  tc->abs_contexts,     INIT_ABS,       img->model_number);
-  BIARI_CTX_INIT2 (NUM_BLOCK_TYPES, NUM_MAP_CTX,  tc->fld_map_contexts, INIT_FLD_MAP,   img->model_number);
-  BIARI_CTX_INIT2 (NUM_BLOCK_TYPES, NUM_LAST_CTX, tc->fld_last_contexts,INIT_FLD_LAST,  img->model_number);
+  BIARI_CTX_INIT1 (   NUM_IPR_CTX,  tc->ipr_contexts,     INIT_IPR,       img->model_number);
+  BIARI_CTX_INIT1 (   NUM_CIPR_CTX, tc->cipr_contexts,    INIT_CIPR,      img->model_number);
+  BIARI_CTX_INIT2 (3, NUM_CBP_CTX,  tc->cbp_contexts,     INIT_CBP,       img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_BCBP_CTX, tc->bcbp_contexts,    INIT_BCBP,      img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_MAP_CTX,  tc->map_contexts,     INIT_MAP,       img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_LAST_CTX, tc->last_contexts,    INIT_LAST,      img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_ONE_CTX,  tc->one_contexts,     INIT_ONE,       img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_ABS_CTX,  tc->abs_contexts,     INIT_ABS,       img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_MAP_CTX,  tc->fld_map_contexts, INIT_FLD_MAP,   img->model_number);
+  BIARI_CTX_INIT2 (8, NUM_LAST_CTX, tc->fld_last_contexts,INIT_FLD_LAST,  img->model_number);
 }
 
 

     ADD_XRATE1 (   NUM_TRANSFORM_SIZE_CTX,  mc->transform_size_contexts, INIT_TRANSFORM_SIZE,  model);
 
     //--- texture coding contexts ---
-    ADD_XRATE1 (                  NUM_IPR_CTX,  tc->ipr_contexts,       INIT_IPR,       model);
-    ADD_XRATE1 (                  NUM_CIPR_CTX, tc->cipr_contexts,      INIT_CIPR,      model);
-    ADD_XRATE2 (3,                NUM_CBP_CTX,  tc->cbp_contexts,       INIT_CBP,       model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_BCBP_CTX, tc->bcbp_contexts,      INIT_BCBP,      model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_MAP_CTX,  tc->map_contexts,       INIT_MAP,       model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_LAST_CTX, tc->last_contexts,      INIT_LAST,      model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_ONE_CTX,  tc->one_contexts,       INIT_ONE,       model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_ABS_CTX,  tc->abs_contexts,       INIT_ABS,       model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_MAP_CTX,  tc->fld_map_contexts,   INIT_FLD_MAP,   model);
-    ADD_XRATE2 (NUM_BLOCK_TYPES,  NUM_LAST_CTX, tc->fld_last_contexts,  INIT_FLD_LAST,  model);
+    ADD_XRATE1 (    NUM_IPR_CTX,  tc->ipr_contexts,       INIT_IPR,       model);
+    ADD_XRATE1 (    NUM_CIPR_CTX, tc->cipr_contexts,      INIT_CIPR,      model);
+    ADD_XRATE2 (3,  NUM_CBP_CTX,  tc->cbp_contexts,       INIT_CBP,       model);
+    ADD_XRATE2 (8,  NUM_BCBP_CTX, tc->bcbp_contexts,      INIT_BCBP,      model);
+    ADD_XRATE2 (8,  NUM_MAP_CTX,  tc->map_contexts,       INIT_MAP,       model);
+    ADD_XRATE2 (8,  NUM_LAST_CTX, tc->last_contexts,      INIT_LAST,      model);
+    ADD_XRATE2 (8,  NUM_ONE_CTX,  tc->one_contexts,       INIT_ONE,       model);
+    ADD_XRATE2 (8,  NUM_ABS_CTX,  tc->abs_contexts,       INIT_ABS,       model);
+    ADD_XRATE2 (8,  NUM_MAP_CTX,  tc->fld_map_contexts,   INIT_FLD_MAP,   model);
+    ADD_XRATE2 (8,  NUM_LAST_CTX, tc->fld_last_contexts,  INIT_FLD_LAST,  model);
 
     if (xr<min_xr)
     {