reactos/lib/drivers/oskittcp/oskittcp/osenv.c

   1 #include "oskittcp.h"
   2
   3 unsigned oskit_freebsd_cpl;
   4
   5 /* We have to store a reference count somewhere so we
   6  * don't free a buffer being referenced in another mbuf.
   7  * I just decided to add an extra char to the beginning of
   8  * the buffer and store the reference count there. I doubt the ref count
   9  * will ever even get close to 0xFF so we should be ok. Remember that
  10  * only one thread can ever be inside oskit due to OSKLock so this should
  11  * be safe.
  12  */
  13
  14 void oskit_bufio_addref(void *buf)
  15 {
  16    unsigned char* fullbuf = ((unsigned char*)buf) - sizeof(char);
  17
  18 #if DBG
  19    if (fullbuf[0] == 0xFF)
  20        panic("oskit_bufio_addref: ref count overflow");
  21 #endif
  22
  23    fullbuf[0]++;
  24 }
  25 void oskit_bufio_release(void *buf)
  26 {
  27    unsigned char* fullbuf = ((unsigned char*)buf) - sizeof(char);
  28
  29    if (--fullbuf[0] == 0)
  30        free(fullbuf, 0);
  31 }
  32 void* oskit_bufio_create(int len)
  33 {
  34    unsigned char* fullbuf = malloc(len + sizeof(char), __FILE__, __LINE__);
  35    if (fullbuf == NULL)
  36        return NULL;
  37
  38    fullbuf[0] = 1;
  39
  40    return (void*)(fullbuf + sizeof(char));
  41 }
  42 void oskit_bufio_map(void *srcbuf, void**dstbuf, int off, int len)
  43 {
  44    *dstbuf = srcbuf;
  45 }