136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* SDL_sound -- An abstract sound format decoding API.
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* Copyright (C) 2001 Ryan C. Gordon.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Some extra RWops that are needed or are just handy to have.
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*
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* Please see the file COPYING in the source's root directory.
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*
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* This file written by Ryan C. Gordon. (icculus@icculus.org)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "SDL.h"
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/*
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* The Reference Counter RWops...
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*/
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typedef struct
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{
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SDL_RWops *rw; /* The actual RWops we're refcounting... */
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int refcount; /* The refcount; starts at 1. If goes to 0, delete. */
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} RWRefCounterData;
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/* Just pass through to the actual SDL_RWops's method... */
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static int refcounter_seek(SDL_RWops *rw, int offset, int whence)
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{
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RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
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return(data->rw->seek(data->rw, offset, whence));
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} /* refcounter_seek */
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/* Just pass through to the actual SDL_RWops's method... */
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static int refcounter_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
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{
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RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
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return(data->rw->read(data->rw, ptr, size, maxnum));
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} /* refcounter_read */
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/* Just pass through to the actual SDL_RWops's method... */
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static int refcounter_write(SDL_RWops *rw, const void *ptr, int size, int num)
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{
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RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
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return(data->rw->write(data->rw, ptr, size, num));
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} /* refcounter_write */
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/*
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* Decrement the reference count. If there are no more references, pass
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* through to the actual SDL_RWops's method, and then clean ourselves up.
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*/
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static int refcounter_close(SDL_RWops *rw)
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{
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int retval = 0;
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RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
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data->refcount--;
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if (data->refcount <= 0)
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{
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retval = data->rw->close(data->rw);
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free(data);
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SDL_FreeRW(rw);
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} /* if */
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return(retval);
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} /* refcounter_close */
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void RWops_RWRefCounter_addRef(SDL_RWops *rw)
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{
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RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
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data->refcount++;
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} /* RWops_RWRefCounter_addRef */
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SDL_RWops *RWops_RWRefCounter_new(SDL_RWops *rw)
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{
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SDL_RWops *retval = NULL;
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if (rw == NULL)
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{
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SDL_SetError("NULL argument to RWops_RWRefCounter_new().");
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return(NULL);
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} /* if */
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retval = SDL_AllocRW();
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if (retval != NULL)
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{
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RWRefCounterData *data;
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data = (RWRefCounterData *) malloc(sizeof (RWRefCounterData));
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if (data == NULL)
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{
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SDL_SetError("Out of memory.");
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SDL_FreeRW(retval);
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retval = NULL;
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} /* if */
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else
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{
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data->rw = rw;
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data->refcount = 1;
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retval->hidden.unknown.data1 = data;
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retval->seek = refcounter_seek;
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retval->read = refcounter_read;
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retval->write = refcounter_write;
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retval->close = refcounter_close;
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} /* else */
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} /* if */
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return(retval);
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} /* RWops_RWRefCounter_new */
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/* end of extra_rwops.c ... */
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