X-Git-Url: http://git.maemo.org/git/?p=mardrone;a=blobdiff_plain;f=mardrone%2FARDrone_SDK_Version_1_8_20110726%2FExamples%2FMultiplatform%2FProtocol%2FVP_Os%2Fvp_os_malloc.c;fp=mardrone%2FARDrone_SDK_Version_1_8_20110726%2FExamples%2FMultiplatform%2FProtocol%2FVP_Os%2Fvp_os_malloc.c;h=1432f769b0798037f8459ce92f57edefc405105a;hp=0000000000000000000000000000000000000000;hb=9ec9bc13b75d30bc45535c54a652934debfcea92;hpb=ae0a3c2dc0898400aca0dd6b439c5db8044db7b2

diff --git a/mardrone/ARDrone_SDK_Version_1_8_20110726/Examples/Multiplatform/Protocol/VP_Os/vp_os_malloc.c b/mardrone/ARDrone_SDK_Version_1_8_20110726/Examples/Multiplatform/Protocol/VP_Os/vp_os_malloc.c
new file mode 100644
index 0000000..1432f76
--- /dev/null
+++ b/mardrone/ARDrone_SDK_Version_1_8_20110726/Examples/Multiplatform/Protocol/VP_Os/vp_os_malloc.c
@@ -0,0 +1,163 @@
+/**
+ * @file malloc.c
+ * @author aurelien.morelle@parrot.fr
+ * @date 2006/12/19
+ */
+
+#include <VP_Os/vp_os_malloc.h>
+
+
+#undef calloc
+#undef malloc
+#undef memset
+#undef free
+#undef realloc
+
+
+void *
+vp_os_calloc(size_t nmemb, size_t size)
+{
+#ifdef DEBUG_MODE
+  void *res = calloc(nmemb, size);
+  assert(res);
+  return (res);
+#else // ! DEBUG_MODE
+  return calloc(nmemb, size);
+#endif // <- DEBUG_MODE
+}
+
+void *
+vp_os_malloc(size_t size)
+{
+#ifdef DEBUG_MODE
+  void *res = malloc(size);
+  assert(res);
+  return (res);
+#else // ! DEBUG_MODE
+  return malloc(size);
+#endif // <- DEBUG_MODE
+}
+
+void *
+vp_os_malloc_no_assert(size_t size)
+{
+  return malloc(size);
+}
+
+void
+vp_os_free(void *ptr)
+{
+#ifdef DEBUG_MODE
+  assert(ptr);
+  free(ptr);
+#else // ! DEBUG_MODE
+  free(ptr);
+#endif // <- DEBUG_MODE
+}
+
+// align_size has to be a power of two !!!
+//
+// The basic working of this algorithm is to allocate a bigger chunk of data than requested.
+// This chunk of data must be big enough to contain an address aligned on requested boundary
+// We also alloc 2 more words to keep base ptr (bptr) & requested size (size) of allocation
+// bptr is the base pointer of this allocation
+// _____ ______ ______ __________
+//  ... | bptr | size |   ....   |
+// _____|______|______|__________|
+// 
+void* vp_os_aligned_malloc(size_t size, size_t align_size)
+{
+  char *ptr, *aligned_ptr;
+  int* ptr2;
+  int allocation_size;
+  size_t align_mask = align_size - 1;
+
+  // Check if align_size is a power of two
+  // If the result of this test is non zero then align_size is not a power of two
+  if( align_size & align_mask )
+    return NULL;
+
+  // Allocation size is :
+  //    - Requested user size
+  //    - a size (align_size) to make sure we can align on the requested boundary
+  //    - 8 more bytes to register base adress & allocation size 
+  allocation_size = size + align_size + 2*sizeof(int);
+
+  ptr = (char*) vp_os_malloc(allocation_size);
+  if(ptr == NULL)
+    return NULL;
+
+  ptr2 = (int*)(ptr + 2*sizeof(int));
+  aligned_ptr = ptr + 2*sizeof(int) + (align_size - ((size_t) ptr2 & align_mask));
+
+  ptr2    = (int*)(aligned_ptr - 2*sizeof(int));
+  *ptr2++ = (int) (aligned_ptr - ptr);
+  *ptr2   = size;
+
+  return aligned_ptr;
+}
+
+void vp_os_aligned_free(void *ptr)
+{
+  int* ptr2 = (int*)ptr - 2;
+
+  vp_os_free( ((char*)ptr - *ptr2) );
+}
+
+void*
+vp_os_aligned_realloc(void* ptr, size_t size, size_t align_size)
+{
+  void* ptr_ret;
+  void* aligned_ptr;
+
+  if( size == 0 )
+  {
+    ptr_ret = NULL;
+    if( ptr != NULL )
+      vp_os_aligned_free(ptr);
+  }
+  else
+  {
+    if( ptr != NULL )
+    {
+      int* ptr2 = (int*)ptr - 1;
+      size_t old_size;
+
+      aligned_ptr = ptr;
+
+      old_size = *ptr2--;
+
+      ptr_ret = vp_os_aligned_malloc(size, align_size);
+
+      // Compute smallest size
+      if( size > old_size )
+      {
+        size = old_size;
+      }
+
+      // Copy old data
+      vp_os_memcpy( ptr_ret, aligned_ptr, size );
+
+      vp_os_free( ((char*)ptr - *ptr2) );
+    }
+    else
+    {
+      ptr_ret = vp_os_aligned_malloc(size, align_size);
+    }
+  }
+
+  return ptr_ret;
+}
+
+void*
+vp_os_realloc(void *ptr, size_t size)
+{
+#ifdef DEBUG_MODE
+  void *res = realloc(ptr, size);
+  assert(res);
+  return (res);
+#else // ! DEBUG_MODE
+  return realloc(ptr, size);
+#endif // <- DEBUG_MODE
+}
+