SDL_RWops* SDL_AllocRW(void)

#include "stdlib.h"
#include "SDL.h"

/* Te funkcje nie powinny być używane tylko poprzez wskaźniki w SDL_RWops */
static Sint64 mysizefunc(SDL_RWops * context)
{
  return -1;
}

static Sint64 myseekfunc(SDL_RWops *context, Sint64 offset, int whence)
{
  return SDL_SetError("Can't seek in this kind of SDL_RWops");
}

static size_t myreadfunc(SDL_RWops *context, void *ptr, size_t size, size_t maxnum)
{
  SDL_memset(ptr,0,size*maxnum);
  return maxnum;
}

static size_t mywritefunc(SDL_RWops *context, const void *ptr, size_t size, size_t num)
{
  return num;
}

static int myclosefunc(SDL_RWops *context)
{
  if(context->type != 0xdeadbeef)
  {
    return SDL_SetError("Wrong kind of SDL_RWops for myclosefunc()");
  }

  free(context->hidden.unknown.data1);
  SDL_FreeRW(context);
  return 0;
}

SDL_RWops *MyCustomRWop()
{
  SDL_RWops *c=SDL_AllocRW();
  if(c==NULL) return NULL;

  c->size  = mysizefunc;
  c->seek  = myseekfunc;
  c->read  = myreadfunc;
  c->write = mywritefunc;
  c->close = myclosefunc;
  c->type  = 0xdeadbeef;
  c->hidden.unknown.data1 = malloc(256);
  return c;
}