libswfdec/swfdec_as_stack.h

   1 /* Swfdec
   2  * Copyright (C) 2007 Benjamin Otte <otte@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifndef _SWFDEC_AS_STACK_H_
  21 #define _SWFDEC_AS_STACK_H_
  22
  23 #include <libswfdec/swfdec_as_types.h>
  24
  25 G_BEGIN_DECLS
  26
  27 struct _SwfdecAsStack {
  28   guint                 n_elements;     /* number of elements */
  29   guint                 used_elements;  /* elements in use (only set on stored stack) */
  30   SwfdecAsStack *       next;           /* pointer to next stack */
  31   SwfdecAsValue         elements[0];    /* the elements */
  32 };
  33
  34 gboolean        swfdec_as_stack_push_segment    (SwfdecAsContext *      context);
  35 void            swfdec_as_stack_pop_segment     (SwfdecAsContext *      context);
  36
  37 //#define SWFDEC_MAD_CHECKS
  38 #ifdef SWFDEC_MAD_CHECKS
  39 #define swfdec_as_stack_peek(cx,n) (&(cx)->cur[-(gssize)(n)])
  40
  41 static inline SwfdecAsValue *
  42 swfdec_as_stack_pop (SwfdecAsContext *cx)
  43 {
  44   g_assert (stack != NULL);
  45   g_assert (cx->cur > cx->base);
  46
  47   return --cx->cur;
  48 }
  49
  50 static inline SwfdecAsValue *
  51 swfdec_as_stack_pop_n (SwfdecAsContext *cx, guint n)
  52 {
  53   g_assert (cx != NULL);
  54   g_assert ((guint) (cx->cur - cx->base) >= n);
  55
  56   return cx->cur -= n;
  57 }
  58
  59 static inline SwfdecAsValue *
  60 swfdec_as_stack_push (SwfdecAsContext *cx)
  61 {
  62   g_assert (cx != NULL);
  63   g_assert (cx->cur < cx->end);
  64
  65   return cx->cur++;
  66 }
  67 #else /* SWFDEC_MAD_CHECKS */
  68 #define swfdec_as_stack_peek(cx,n) (&(cx)->cur[-(gssize)(n)])
  69 #define swfdec_as_stack_pop(cx) (--(cx)->cur)
  70 #define swfdec_as_stack_pop_n(cx, n) ((cx)->cur -= (n))
  71 #define swfdec_as_stack_push(cx) ((cx)->cur++)
  72 #endif
  73 #define swfdec_as_stack_swap(cx,x,y) G_STMT_START { \
  74   SwfdecAsContext *__cx = (cx); \
  75   SwfdecAsValue __tmp; \
  76   guint __x = (x), __y = (y); \
  77   __tmp = *swfdec_as_stack_peek(__cx, __x); \
  78   *swfdec_as_stack_peek(__cx, __x) = *swfdec_as_stack_peek(__cx, __y); \
  79   *swfdec_as_stack_peek(__cx, __y) = __tmp; \
  80 }G_STMT_END
  81
  82 void            swfdec_as_stack_mark            (SwfdecAsStack *        stack);
  83 void            swfdec_as_stack_ensure_size     (SwfdecAsContext *      context,
  84                                                  guint                  n_elements);
  85 void            swfdec_as_stack_ensure_free     (SwfdecAsContext *      context,
  86                                                  guint                  n_elements);
  87 guint           swfdec_as_stack_get_size        (SwfdecAsContext *      context);
  88
  89
  90 G_END_DECLS
  91 #endif