Mercurial > sdl-ios-xcode

annotate src/audio/mme/SDL_mmeaudio.h @ 4355:9b464226e541 SDL-1.2

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Fixed bug #855 Ludwig Nussel 2009-10-18 06:31:52 PDT an mprotect call was added to fix bug 528. However that results in a buffer that allows writing and code execution. Ie the no-execute security features of modern operating systems are defeated this way. Two mprotect calls are needed. One to make the buffer executable but not writeable when done and another one to make the buffer writeable again if the content needs to be changed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Oct 2009 17:31:37 +0000
parents a1b03ba2fcd0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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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 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #ifndef _SDL_lowaudio_h
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27 #define _SDL_lowaudio_h
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28
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29 #include "../SDL_sysaudio.h"
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30
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31 /* Hidden "this" pointer for the video functions */
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32 #define _THIS SDL_AudioDevice *this
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33 #define NUM_BUFFERS 2
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34
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35 struct SharedMem {
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36 HWAVEOUT sound;
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37 WAVEHDR wHdr[NUM_BUFFERS];
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38 PCMWAVEFORMAT wFmt;
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39 };
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40
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41 struct SDL_PrivateAudioData {
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42 Uint8 *mixbuf; /* The raw allocated mixing buffer */
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43 struct SharedMem *shm;
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44 int next_buffer;
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45 };
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46
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47 #define shm (this->hidden->shm)
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48 #define mixbuf (this->hidden->mixbuf)
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49 #define next_buffer (this->hidden->next_buffer)
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50 /* Old variable names */
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51 #endif /* _SDL_lowaudio_h */