* are granted under this license.
*
* Copyright (c) 2015, Mathieu Malaterre <mathieu.malaterre@gmail.com>
+ * Copyright (c) 2015, Matthieu Darbois
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
static inline void *opj_aligned_alloc_n(size_t alignment, size_t size)
{
+ void* ptr;
+
+ /* alignment shall be power of 2 */
+ assert( (alignment != 0U) && ((alignment & (alignment - 1U)) == 0U));
+
#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
* superseded by aligned_alloc, it is more portable to older POSIX systems
* that do not support ISO C11. */
- void* ptr;
if (posix_memalign (&ptr, alignment, size))
{
ptr = NULL;
}
- return ptr;
/* older linux */
#elif defined(HAVE_MEMALIGN)
- assert( size & (alignment - 1u) == 0 );
- return memalign( alignment, size );
+ ptr = memalign( alignment, size );
/* _MSC_VER */
#elif defined(HAVE__ALIGNED_MALLOC)
- return _aligned_malloc( alignment, size );
+ ptr = _aligned_malloc( alignment, size );
#else
/* TODO: _mm_malloc(x,y) */
#error missing aligned alloc function
#endif
+ return ptr;
}
static inline void *opj_aligned_realloc_n(void *ptr, size_t alignment, size_t size)
{
- void *a_ptr;
+ void *r_ptr;
+
+ /* alignment shall be power of 2 */
+ assert( (alignment != 0U) && ((alignment & (alignment - 1U)) == 0U));
+
/* no portable aligned realloc */
#if defined(HAVE_POSIX_MEMALIGN) || defined(HAVE_MEMALIGN)
/* glibc doc states one can mixed aligned malloc with realloc */
- void *r_ptr = realloc( ptr, size );
- assert( alignment > 0 );
- /* fast path */
+ r_ptr = realloc( ptr, 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)) == 0 )
- return r_ptr;
- /* this is non-trivial to implement a portable aligned realloc, so use a
- * 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) */
- a_ptr = opj_aligned_alloc_n(alignment, size);
- memcpy(a_ptr, r_ptr, size);
- free( r_ptr );
- return a_ptr;
+ if( ((size_t)r_ptr & (alignment - 1U)) != 0U ) {
+ /* this is non-trivial to implement a portable aligned realloc, so use a
+ * 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);
+ if (a_ptr != NULL) {
+ memcpy(a_ptr, r_ptr, size);
+ }
+ free( r_ptr );
+ r_ptr = a_ptr;
+ }
/* _MSC_VER */
#elif defined(HAVE__ALIGNED_MALLOC)
- return _aligned_realloc( ptr, size, alignment );
+ r_ptr = _aligned_realloc( ptr, size, alignment );
#else
/* TODO: _mm_malloc(x,y) */
#error missing aligned realloc function
#endif
+ return r_ptr;
}
void * opj_malloc(size_t size)
{