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