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Fixed bug #46 Date: Fri, 13 Jan 2006 18:09:45 -0500 From: mhall4400 vipmail kvcc edu Subject: Possible SDL bug Greetings I believe Ive come across a bug in your SDL product (1.2.9), in the CD-ROM control portion of the library. When calling the SDL_CDPlay() function to play the last track of a CD using the offset and length from an SDL_CD structure generated by SDL_CDOpen(), I get the following error from a call to SDL_Error(): mciSendCommand() error: The specified parameter is out of range for the specified command. The code returning the error is: SDL_CDPlay(g_playingDriveSDLCD, g_playingDriveSDLCD->track[trackNumberInt].offset, g_playingDriveSDLCD->track[trackNumberInt].length) Subtracting one from the length of the provided length seems to repair the problem: SDL_CDPlay(g_playingDriveSDLCD, g_playingDriveSDLCD->track[trackNumberInt].offset, (g_playingDriveSDLCD->track[trackNumberInt].length) - 1) Ive replicated this problem on Windows 98 SE (several months since last patch), fully-patched Window ME, seldom-patched Windows XP SP1, and fully-patched Windows XP SP2. While investigating the issue, I came across a line in your librarys win32 source code in file \src\cdrom\win32\SDL_syscdrom.c (source code zip archive from your download page), function: SDL_SYS_CDGetTOC(), line 226 where you add 1 to the value for length to fix MCI last track length bug. This may be the source of the issue (because subtracting 1 from the length seems to resolve the issue). Microsoft may have patched the referenced bug since you wrote that line. Mike Hall
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Mar 2006 05:34:39 +0000
parents b2b476a4a73c
children 14717b52abc0
line wrap: on
line source


/* sanity tests on SDL_rwops.c (usefull for alternative implementations of stdio rwops) */

#include <stdlib.h>

#include "SDL.h"
#include "SDL_endian.h"


#include <stdio.h>	

/* WARNING ! those 2 files will be destroyed by this test program */
#define FBASENAME1	"sdldata1"		/* this file will be created during tests */
#define FBASENAME2	"sdldata2"		/* this file should not exists before starting test */


#ifndef NULL
#define NULL ((void *)0)
#endif 

static void cleanup( void ) {

	unlink(FBASENAME1);
	unlink(FBASENAME2); 
}

static void rwops_error_quit( unsigned line, SDL_RWops *rwops) {
	
	printf("testfile.c(%d): failed\n",line);
	if (rwops) {
		rwops->close(rwops); /* This calls SDL_FreeRW(rwops); */
	}
	cleanup();
	exit(1); /* quit with rwops error (test failed) */
}

#define RWOP_ERR_QUIT(x)	rwops_error_quit( __LINE__, (x) )



int main(int argc, char *argv[])
{
	SDL_RWops *rwops = NULL;
	char test_buf[30];
	
	cleanup();

/* test 1 : basic argument test: all those calls to SDL_RWFromFile should fail */
	
	rwops = SDL_RWFromFile(NULL,NULL);
	if (rwops) RWOP_ERR_QUIT(rwops);
	rwops = SDL_RWFromFile(NULL,"ab+");
	if (rwops) RWOP_ERR_QUIT(rwops);
	rwops = SDL_RWFromFile(NULL,"sldfkjsldkfj");
	if (rwops) RWOP_ERR_QUIT(rwops);
	rwops = SDL_RWFromFile("something","");
	if (rwops) RWOP_ERR_QUIT(rwops);
	rwops = SDL_RWFromFile("something",NULL);
	if (rwops) RWOP_ERR_QUIT(rwops);	
	printf("test1 OK\n");

/* test 2 : check that inexistant file is not successfully opened/created when required */
/* modes : r, r+ implie that file MUST exist 
   modes : a, a+, w, w+ checks that it succeeds (file may not exists)
   
 */
	rwops = SDL_RWFromFile(FBASENAME2,"rb"); /* this file doesn't exist that call must fail */
	if (rwops) RWOP_ERR_QUIT(rwops);
	rwops = SDL_RWFromFile(FBASENAME2,"rb+"); /* this file doesn't exist that call must fail */
	if (rwops) RWOP_ERR_QUIT(rwops);
	rwops = SDL_RWFromFile(FBASENAME2,"wb");
	if (!rwops) RWOP_ERR_QUIT(rwops); 
	rwops->close(rwops); unlink(FBASENAME2);
	rwops = SDL_RWFromFile(FBASENAME2,"wb+");
	if (!rwops) RWOP_ERR_QUIT(rwops); 
	rwops->close(rwops); unlink(FBASENAME2);
	rwops = SDL_RWFromFile(FBASENAME2,"ab"); 
	if (!rwops) RWOP_ERR_QUIT(rwops); 
	rwops->close(rwops); unlink(FBASENAME2);
	rwops = SDL_RWFromFile(FBASENAME2,"ab+");
	if (!rwops) RWOP_ERR_QUIT(rwops); 
	rwops->close(rwops); unlink(FBASENAME2);
	printf("test2 OK\n");

/* test 3 : creation, writing , reading, seeking, 
	        test : w mode, r mode, w+ mode
 */
	rwops = SDL_RWFromFile(FBASENAME1,"wb"); /* write only */	
	if (!rwops)											RWOP_ERR_QUIT(rwops);
	if (1 != rwops->write(rwops,"1234567890",10,1) )	RWOP_ERR_QUIT(rwops);		
	if (10 != rwops->write(rwops,"1234567890",1,10) )	RWOP_ERR_QUIT(rwops);		
	if (7 != rwops->write(rwops,"1234567",1,7) )		RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	if (0!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops); /* we are in write only mode */
	rwops->close(rwops);

	rwops = SDL_RWFromFile(FBASENAME1,"rb"); /* read mode, file must exists */
	if (!rwops)											RWOP_ERR_QUIT(rwops);
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	if (20!=rwops->seek(rwops,-7,RW_SEEK_END))			RWOP_ERR_QUIT(rwops);					
	if (7!=rwops->read(rwops,test_buf,1,7))				RWOP_ERR_QUIT(rwops);		
	if (SDL_memcmp(test_buf,"1234567",7))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,10,100))			RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->seek(rwops,-27,RW_SEEK_CUR))			RWOP_ERR_QUIT(rwops);		
	if (2!=rwops->read(rwops,test_buf,10,3))			RWOP_ERR_QUIT(rwops);				
	if (SDL_memcmp(test_buf,"12345678901234567890",20))	RWOP_ERR_QUIT(rwops);
	if (0!=rwops->write(rwops,test_buf,1,1))			RWOP_ERR_QUIT(rwops); /* readonly mode */
	rwops->close(rwops);

/* test 3: same with w+ mode */
	rwops = SDL_RWFromFile(FBASENAME1,"wb+"); /* write + read + truncation */		
	if (!rwops)											RWOP_ERR_QUIT(rwops);
	if (1 != rwops->write(rwops,"1234567890",10,1) )	RWOP_ERR_QUIT(rwops);		
	if (10 != rwops->write(rwops,"1234567890",1,10) )	RWOP_ERR_QUIT(rwops);		
	if (7 != rwops->write(rwops,"1234567",1,7) )		RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	if (1!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops); /* we are in read/write mode */
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	if (20!=rwops->seek(rwops,-7,RW_SEEK_END))			RWOP_ERR_QUIT(rwops);					
	if (7!=rwops->read(rwops,test_buf,1,7))				RWOP_ERR_QUIT(rwops);		
	if (SDL_memcmp(test_buf,"1234567",7))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,10,100))			RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->seek(rwops,-27,RW_SEEK_CUR))			RWOP_ERR_QUIT(rwops);		
	if (2!=rwops->read(rwops,test_buf,10,3))			RWOP_ERR_QUIT(rwops);				
	if (SDL_memcmp(test_buf,"12345678901234567890",20))	RWOP_ERR_QUIT(rwops);
	rwops->close(rwops);
	printf("test3 OK\n");

/* test 4: same in r+ mode */
	rwops = SDL_RWFromFile(FBASENAME1,"rb+"); /* write + read + file must exists, no truncation */		
	if (!rwops)											RWOP_ERR_QUIT(rwops);
	if (1 != rwops->write(rwops,"1234567890",10,1) )	RWOP_ERR_QUIT(rwops);		
	if (10 != rwops->write(rwops,"1234567890",1,10) )	RWOP_ERR_QUIT(rwops);		
	if (7 != rwops->write(rwops,"1234567",1,7) )		RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	if (1!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops); /* we are in read/write mode */
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	if (20!=rwops->seek(rwops,-7,RW_SEEK_END))			RWOP_ERR_QUIT(rwops);					
	if (7!=rwops->read(rwops,test_buf,1,7))				RWOP_ERR_QUIT(rwops);		
	if (SDL_memcmp(test_buf,"1234567",7))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,10,100))			RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->seek(rwops,-27,RW_SEEK_CUR))			RWOP_ERR_QUIT(rwops);		
	if (2!=rwops->read(rwops,test_buf,10,3))			RWOP_ERR_QUIT(rwops);				
	if (SDL_memcmp(test_buf,"12345678901234567890",20))	RWOP_ERR_QUIT(rwops);
	rwops->close(rwops);
	printf("test4 OK\n");

/* test5 : append mode */
	rwops = SDL_RWFromFile(FBASENAME1,"ab+"); /* write + read + append */		
	if (!rwops)											RWOP_ERR_QUIT(rwops);
	if (1 != rwops->write(rwops,"1234567890",10,1) )	RWOP_ERR_QUIT(rwops);		
	if (10 != rwops->write(rwops,"1234567890",1,10) )	RWOP_ERR_QUIT(rwops);		
	if (7 != rwops->write(rwops,"1234567",1,7) )		RWOP_ERR_QUIT(rwops); 	
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	
	if (1!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops); 
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);					
	
	if (20+27!=rwops->seek(rwops,-7,RW_SEEK_END))		RWOP_ERR_QUIT(rwops);					
	if (7!=rwops->read(rwops,test_buf,1,7))				RWOP_ERR_QUIT(rwops);		
	if (SDL_memcmp(test_buf,"1234567",7))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,1,1))				RWOP_ERR_QUIT(rwops);		
	if (0!=rwops->read(rwops,test_buf,10,100))			RWOP_ERR_QUIT(rwops);		
	
	if (27!=rwops->seek(rwops,-27,RW_SEEK_CUR))			RWOP_ERR_QUIT(rwops);
	
	if (0!=rwops->seek(rwops,0L,RW_SEEK_SET))			RWOP_ERR_QUIT(rwops);
	if (3!=rwops->read(rwops,test_buf,10,3))			RWOP_ERR_QUIT(rwops);				
	if (SDL_memcmp(test_buf,"123456789012345678901234567123",30))	
														RWOP_ERR_QUIT(rwops);
	rwops->close(rwops);
	printf("test5 OK\n");
	cleanup();
	return 0; /* all ok */
}