src/utils/mem_align.c

#include <stdlib.h>
#include <stdio.h>
#include "mem_align.h"

void *xvid_malloc(size_t size, uint8_t alignment)
{
  uint8_t *mem_ptr;
  
  if(alignment == 0)
  {
          if((mem_ptr = (uint8_t *) malloc(size + 1)) != NULL) {
                *mem_ptr = 0;
                return (void *) mem_ptr++;
          }
  }
  else
  {
          uint8_t *tmp;
        
          if((tmp = (uint8_t *) malloc(size + alignment)) != NULL) {
                mem_ptr = (uint8_t *) (((uint32_t) tmp / alignment) * alignment + alignment);
                *(mem_ptr - 1) = (alignment - 1) - ((uint32_t) tmp % alignment);
                return (void *) mem_ptr;
          }
  }

  return NULL;
}

void xvid_free(void *mem_ptr)
{
  uint8_t *tmp;

  tmp = (uint8_t *) mem_ptr - 1;
  mem_ptr  = tmp - *tmp;

  free(mem_ptr);
}
Revision:	1.2
Committed:	Wed Mar 20 00:27:57 2002 UTC (22 years, 6 months ago) by Isibaar
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+38 -0 lines
Log Message:	xvid_malloc/xvid_free
#	Content
1	#include <stdlib.h>
2	#include <stdio.h>
3	#include "mem_align.h"
4
5	void *xvid_malloc(size_t size, uint8_t alignment)
6	{
7	uint8_t *mem_ptr;
8
9	if(alignment == 0)
10	{
11	if((mem_ptr = (uint8_t *) malloc(size + 1)) != NULL) {
12	*mem_ptr = 0;
13	return (void *) mem_ptr++;
14	}
15	}
16	else
17	{
18	uint8_t *tmp;
19
20	if((tmp = (uint8_t *) malloc(size + alignment)) != NULL) {
21	mem_ptr = (uint8_t ) (((uint32_t) tmp / alignment) alignment + alignment);
22	*(mem_ptr - 1) = (alignment - 1) - ((uint32_t) tmp % alignment);
23	return (void *) mem_ptr;
24	}
25	}
26
27	return NULL;
28	}
29
30	void xvid_free(void *mem_ptr)
31	{
32	uint8_t *tmp;
33
34	tmp = (uint8_t *) mem_ptr - 1;
35	mem_ptr = tmp - *tmp;
36
37	free(mem_ptr);
38	}