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comparison extra_rwops.c @ 8:dca15bb29d35

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Initial add.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 18 Sep 2001 10:54:21 +0000
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children 2b5ba7f33840
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7:29313c20963d 8:dca15bb29d35
1 /*
2 * SDL_sound -- An abstract sound format decoding API.
3 * Copyright (C) 2001 Ryan C. Gordon.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /*
21 * Some extra RWops that are needed or are just handy to have.
22 *
23 * Please see the file LICENSE in the source's root directory.
24 *
25 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include "SDL.h"
31
32
33 /*
34 * The Reference Counter RWops...
35 */
36
37
38 typedef struct
39 {
40 SDL_RWops *rw; /* The actual RWops we're refcounting... */
41 int refcount; /* The refcount; starts at 1. If goes to 0, delete. */
42 } RWRefCounterData;
43
44
45 /* Just pass through to the actual SDL_RWops's method... */
46 static int refcounter_seek(SDL_RWops *rw, int offset, int whence)
47 {
48 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
49 return(data->rw->seek(data->rw, offset, whence));
50 } /* refcounter_seek */
51
52
53 /* Just pass through to the actual SDL_RWops's method... */
54 static int refcounter_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
55 {
56 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
57 return(data->rw->read(data->rw, ptr, size, maxnum));
58 } /* refcounter_read */
59
60
61 /* Just pass through to the actual SDL_RWops's method... */
62 static int refcounter_write(SDL_RWops *rw, const void *ptr, int size, int num)
63 {
64 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
65 return(data->rw->write(data->rw, ptr, size, num));
66 } /* refcounter_write */
67
68
69 /*
70 * Decrement the reference count. If there are no more references, pass
71 * through to the actual SDL_RWops's method, and then clean ourselves up.
72 */
73 static int refcounter_close(SDL_RWops *rw)
74 {
75 int retval = 0;
76 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
77 data->refcount--;
78 if (data->refcount <= 0)
79 {
80 retval = data->rw->close(data->rw);
81 free(data);
82 SDL_FreeRW(rw);
83 } /* if */
84
85 return(retval);
86 } /* refcounter_close */
87
88
89 void RWops_RWRefCounter_addRef(SDL_RWops *rw)
90 {
91 RWRefCounterData *data = (RWRefCounterData *) rw->hidden.unknown.data1;
92 data->refcount++;
93 } /* RWops_RWRefCounter_addRef */
94
95
96 SDL_RWops *RWops_RWRefCounter_new(SDL_RWops *rw)
97 {
98 SDL_RWops *retval = NULL;
99
100 if (rw == NULL)
101 {
102 SDL_SetError("NULL argument to RWops_RWRefCounter_new().");
103 return(NULL);
104 } /* if */
105
106 retval = SDL_AllocRW();
107 if (retval != NULL)
108 {
109 RWRefCounterData *data;
110 data = (RWRefCounterData *) malloc(sizeof (RWRefCounterData));
111 if (data == NULL)
112 {
113 SDL_OutOfMemory();
114 SDL_FreeRW(retval);
115 retval = NULL;
116 } /* if */
117 else
118 {
119 data->rw = rw;
120 data->refcount = 1;
121 retval->hidden.unknown.data1 = data;
122 retval->seek = refcounter_seek;
123 retval->read = refcounter_read;
124 retval->write = refcounter_write;
125 retval->close = refcounter_close;
126 } /* else */
127 } /* if */
128
129 return(retval);
130 } /* RWops_RWRefCounter_new */
131
132
133 /* end of extra_rwops.c ... */
134
135