SDL_RWops* SDL_AllocRW(void)

#include <string.h>    /* for memset */
#include "SDL_error.h" /* for SDL_SetError */
#include "SDL_rwops.h"

/* These functions should not be used except from pointers in a RWops */
static int myseekfunc(SDL_RWops *context, int offset, int whence)
{
  SDL_SetError("Can't seek in this kind of RWops");
  return(-1);
}

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

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

static int myclosefunc(SDL_RWops *context)
{
  if(context->type != 0xdeadbeef)
  {
    SDL_SetError("Wrong kind of RWops for myclosefunc()");
    return(-1);
  }

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

/* Note that this function is NOT static -- we want it directly callable from other source files */
SDL_RWops *MyCustomRWop()
{
  SDL_RWops *c=SDL_AllocRW();
  if(c==NULL) return(NULL);

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