Fix inconsistent behavior of malloc(0)

Update #635
Update #625

src/lib/openjp2/dwt.c

@@ -568,8 +568,10 @@ static OPJ_BOOL opj_dwt_decode_tile(opj_tcd_tilecomp_t* tilec, OPJ_UINT32 numres
 
 	OPJ_UINT32 w = (OPJ_UINT32)(tilec->x1 - tilec->x0);
 	
-	h.mem = (OPJ_INT32*)
+	if (numres == 1U) {
-	opj_aligned_malloc(opj_dwt_max_resolution(tr, numres) * sizeof(OPJ_INT32));
+		return OPJ_TRUE;
+	}
+	h.mem = (OPJ_INT32*)opj_aligned_malloc(opj_dwt_max_resolution(tr, numres) * sizeof(OPJ_INT32));
 	if (! h.mem){
 		/* FIXME event manager error callback */
 		return OPJ_FALSE;

src/lib/openjp2/opj_malloc.c

@@ -44,6 +44,10 @@ static inline void *opj_aligned_alloc_n(size_t alignment, size_t size)
   /* alignment shall be power of 2 */
   assert( (alignment != 0U) && ((alignment & (alignment - 1U)) == 0U));
 
+  if (size == 0U) { /* prevent implementation defined behavior of realloc */
+    return NULL;
+  }
+
 #if defined(HAVE_POSIX_MEMALIGN)
   /* aligned_alloc requires c11, restrict to posix_memalign for now. Quote:
    * This function was introduced in POSIX 1003.1d. Although this function is
@@ -65,17 +69,21 @@ static inline void *opj_aligned_alloc_n(size_t alignment, size_t size)
 #endif
   return ptr;
 }
-static inline void *opj_aligned_realloc_n(void *ptr, size_t alignment, size_t size)
+static inline void *opj_aligned_realloc_n(void *ptr, size_t alignment, size_t new_size)
 {
   void *r_ptr;
 
   /* alignment shall be power of 2 */
   assert( (alignment != 0U) && ((alignment & (alignment - 1U)) == 0U));
 
+  if (new_size == 0U) { /* prevent implementation defined behavior of realloc */
+    return NULL;
+  }
+
 /* no portable aligned realloc */
 #if defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_MEMALIGN)
   /* glibc doc states one can mixed aligned malloc with realloc */
-  r_ptr = realloc( ptr, size ); /* fast path */
+  r_ptr = realloc( ptr, new_size ); /* fast path */
   /* we simply use `size_t` to cast, since we are only interest in binary AND
    * operator */
   if( ((size_t)r_ptr & (alignment - 1U)) != 0U ) {
@@ -83,16 +91,16 @@ static inline void *opj_aligned_realloc_n(void *ptr, size_t alignment, size_t si
      * simple approach where we do not need a function that return the size of an
      * allocated array (eg. _msize on Windows, malloc_size on MacOS,
      * malloc_usable_size on systems with glibc) */
-    void *a_ptr = opj_aligned_alloc_n(alignment, size);
+    void *a_ptr = opj_aligned_alloc_n(alignment, new_size);
     if (a_ptr != NULL) {
-      memcpy(a_ptr, r_ptr, size);
+      memcpy(a_ptr, r_ptr, new_size);
     }
     free( r_ptr );
     r_ptr = a_ptr;
   }
 /* _MSC_VER */
 #elif defined(HAVE__ALIGNED_MALLOC)
-  r_ptr = _aligned_realloc( ptr, size, alignment );
+  r_ptr = _aligned_realloc( ptr, new_size, alignment );
 #else
 /* TODO: _mm_malloc(x,y) */
 #error missing aligned realloc function
@@ -101,20 +109,27 @@ static inline void *opj_aligned_realloc_n(void *ptr, size_t alignment, size_t si
 }
 void * opj_malloc(size_t size)
 {
+  if (size == 0U) { /* prevent implementation defined behavior of realloc */
+    return NULL;
+  }
   return malloc(size);
 }
-void * opj_calloc(size_t numOfElements, size_t sizeOfElements)
+void * opj_calloc(size_t num, size_t size)
 {
-  return calloc(numOfElements, sizeOfElements);
+  if (size == 0U) { /* prevent implementation defined behavior of realloc */
+    return NULL;
+  }
+  /* according to C89 standard, num == 0 shall return a valid pointer */
+  return calloc(num, size);
 }
 
 void *opj_aligned_malloc(size_t size)
 {
-  return opj_aligned_alloc_n(16u,size);
+  return opj_aligned_alloc_n(16U, size);
 }
 void * opj_aligned_realloc(void *ptr, size_t size)
 {
-  return opj_aligned_realloc_n(ptr,16u,size);
+  return opj_aligned_realloc_n(ptr, 16U, size);
 }
 
 void opj_aligned_free(void* ptr)
@@ -126,11 +141,14 @@ void opj_aligned_free(void* ptr)
 #endif
 }
 
-void * opj_realloc(void * m, size_t s)
+void * opj_realloc(void *ptr, size_t new_size)
 {
-  return realloc(m,s);
+  if (new_size == 0U) { /* prevent implementation defined behavior of realloc */
+    return NULL;
+  }
+  return realloc(ptr, new_size);
 }
-void opj_free(void * m)
+void opj_free(void *ptr)
 {
-  free(m);
+  free(ptr);
 }

src/lib/openjp2/tcd.c

@@ -871,7 +871,7 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
 				l_band->stepsize = (OPJ_FLOAT32)(((1.0 + l_step_size->mant / 2048.0) * pow(2.0, (OPJ_INT32) (numbps - l_step_size->expn)))) * fraction;
 				l_band->numbps = l_step_size->expn + (OPJ_INT32)l_tccp->numgbits - 1;      /* WHY -1 ? */
 				
-				if (! l_band->precincts) {
+				if (!l_band->precincts && (l_nb_precincts > 0U)) {
 					l_band->precincts = (opj_tcd_precinct_t *) opj_malloc( /*3 * */ l_nb_precinct_size);
 					if (! l_band->precincts) {
 						return OPJ_FALSE;
@@ -930,7 +930,7 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
 					/*fprintf(stderr, "\t\t\t\t precinct_cw = %d x recinct_ch = %d\n",l_current_precinct->cw, l_current_precinct->ch);      */
 					l_nb_code_blocks_size = l_nb_code_blocks * (OPJ_UINT32)sizeof_block;
 					
-					if (! l_current_precinct->cblks.blocks) {
+					if (!l_current_precinct->cblks.blocks && (l_nb_code_blocks > 0U)) {
 						l_current_precinct->cblks.blocks = opj_malloc(l_nb_code_blocks_size);
 						if (! l_current_precinct->cblks.blocks ) {
 							return OPJ_FALSE;