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Descent3/ddio_lnx/lnxcdrom.cpp

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/*
* Descent 3
* Copyright (C) 2024 Parallax Software
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* $Logfile: /DescentIII/Main/ddio_lnx/lnxcdrom.cpp $
* $Revision: 1.12 $
* $Date: 2004/12/05 04:00:20 $
* $Author: ryan $
*
* Linux cdrom routines (borrowed some code from SDL)
*
* $Log: lnxcdrom.cpp,v $
* Revision 1.12 2004/12/05 04:00:20 ryan
* MacOS X patches.
*
* Revision 1.11 2004/03/21 17:11:39 kevinb
* Fixes so linux will compile again. Tested with gcc-2.96
*
* Revision 1.10 2004/02/25 00:04:06 ryan
* Removed loki_utils dependency and ported to MacOS X (runs, but incomplete).
*
* Revision 1.9 2001/01/11 11:41:29 icculus
* Mounting fix.
*
* Revision 1.8 2000/07/07 01:45:32 icculus
* Reinit functionality.
*
* Revision 1.7 2000/07/06 22:15:49 icculus
* Changed to work with GetMultiCDPath()'s new behaviour.
*
* Revision 1.6 2000/06/29 08:57:34 icculus
* Took out the Mount() and Unmount() code, 'cause it was retarded. Do it
* outside the program.
*
* Revision 1.5 2000/06/29 06:41:23 icculus
* mad commits.
*
* Revision 1.4 2000/06/24 01:15:15 icculus
* patched to compile.
*
* Revision 1.3 2000/04/27 11:16:34 icculus
* Took out SDL_Init() call. It's handled in $/Main/lnxmain.cpp, now.
*
* Revision 1.2 2000/04/24 03:18:00 icculus
* SDLified and loki_utilified this code. Lots of paradigm fixes, too. It's
* VERY different now.
*
* Revision 1.1.1.1 2000/04/18 00:00:33 icculus
* initial checkin
*
*
* 5 12/01/99 3:30p Jeff
* ddio_GetCDDrive now returns NULL instead of ""
*
* 4 10/05/99 12:54p Jeff
* removed system() call
*
* 3 10/02/99 6:50p Jeff
* pretty solid cd-rom support now. Tested and seems to work. Need to
* figure out a better way of handlng /proc/mounts
*
* 2 10/02/99 3:00p Jeff
* slightly rewritten due to some early design flaws (namely multiple
* cd-rom drives, and the drive would be mounted when you try to switch
* CDs). This should be better (though only 1 cd-rom drive is supported
* now). May not compile yet.
*
* 1 10/01/99 7:44p Jeff
* initial checkin
*
* $NoKeywords: $
*/
#include <sys/mount.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <SDL.h>
#include "mem.h"
#include "mono.h"
#include "ddio.h"
#include "debug.h"
#include "pserror.h"
#include "loki_utils.h"
#define VD_LSN 16 // first logical sector of volume descriptor table
#define CDROM_LSECSZ 2048 // initial logical sector size of a CDROM
#define CDROM_LBS CDROM_LSECSZ
class system_cdroms {
public:
system_cdroms();
~system_cdroms();
bool Mount(void);
bool UnMount(void);
// Given a device specified by the user, it will make it the
// default device for the system.
bool SetDefaultDevice(char *device);
// resets the device mountpoint. If the mountpoint was created, it will
// unmount the drive and remove the mountpoint directory
void ResetMountpoint(void);
// This function will check the default device to see if it
// has a CD in it with the given volume. If it doesn't
// then it will unmount the device (if it is mounted), in preparation
// for a CD switch. If it does have the correct CD in it, then
// it wil be mounted (if it isn't already) and the mount position
// will be given in mountpoint. If it can't mount it will return false;
bool PrepareForVolume(char *volume, char *mountpoint);
// Returns the device name of the default drive
const char *GetDeviceName(void);
// Returns the volume name of the default drive
const char *GetVolumeName(void);
// Returns true if a CD is in the default device drive
bool IsCdInDrive(void);
private:
bool IsCdInDrive(int drive);
const char *CDName(int drive);
const char *GetVolume(int drive);
int GetNumCDRoms(void);
// checks to see if the given cd-rom device is mounted
// if so, it returns true and fills in mountpoint with the
// directory it is mounted in
bool IsDeviceMounted(const char *device, char *mountpoint, int max_size);
// Check a drive to see if it is a CD-ROM
int CheckDrive(char *drive, struct stat *stbuf);
// Add a CD-ROM drive to our list of valid drives
void AddDrive(char *drive, struct stat *stbuf);
void Shutdown(void);
// Locks the CD-ROM
void LockDevice(void);
// UnLocks the CD-ROM
void UnLockDevice(void);
// This function will go through our list of devices
// when it comes across the first CD-ROM (which can only be
// detected when a CD is in the drive), it will make it the default
// device.
public:
void FindDefaultDevice(void);
void reinit(void);
private:
// Queries the settings for the default drive
// First it checks to see if the drive is already mounted
// If it is, it's mountpoint is saved and we continue
// If it isn't mounted, the it will create a mountpoint for the device
// and mount it there.
void QueryDefaultDevice(void);
bool m_CreatedMountPoint;
bool m_DefaultMounted;
public: // !!! hack. Make an accessor method.
char m_MountedDir[_MAX_PATH];
private:
char m_MountDirectory[_MAX_PATH];
int m_NumCDRoms;
int m_DeviceToUse;
};
system_cdroms CDROM_Devices;
// Given a device/drive, this marks it as the default CD-ROM drive
void ddio_MarkDefaultCDDrive(char *drive) {
bool ret = CDROM_Devices.SetDefaultDevice(drive);
/*
if(!ret)
{
Error("Unable to set %s as the default CD-ROM drive\n",drive);
}
*/
}
void ddio_ReinitCDSystem(void) { CDROM_Devices.reinit(); }
// Give a volume label to look for, and if it's found returns a path
// If it isn't found, return NULL
char *ddio_GetCDDrive(char *vol) {
static char drivepath[_MAX_PATH];
/*
if(*vol=='\0')
return NULL;
bool ret = CDROM_Devices.PrepareForVolume(vol,drivepath);
if(!ret)
{
// nope...not yet
return NULL;
}
*/
CDROM_Devices.FindDefaultDevice(); // returns if already set.
if (CDROM_Devices.Mount() == false)
return (NULL);
strcpy(drivepath, CDROM_Devices.m_MountedDir);
return drivepath;
}
void cdrom_system_shutdown(void) { CDROM_Devices.ResetMountpoint(); }
void cdrom_set_system_shutdown(void) {
static bool set = false;
if (set)
return;
set = true;
atexit(cdrom_system_shutdown);
}
system_cdroms::system_cdroms(void) { reinit(); }
void system_cdroms::reinit(void) {
SDL_QuitSubSystem(SDL_INIT_CDROM);
SDL_Init(SDL_INIT_CDROM);
m_CreatedMountPoint = false;
m_NumCDRoms = 0;
m_DeviceToUse = -1;
m_DefaultMounted = false;
m_NumCDRoms = GetNumCDRoms();
} // reinit
system_cdroms::~system_cdroms(void) {
// SDL_QuitSubSystem(SDL_INIT_CDROM);
}
int system_cdroms::GetNumCDRoms(void) { return (SDL_CDNumDrives()); }
// Returns the device name of the default drive
const char *system_cdroms::GetDeviceName(void) { return CDName(m_DeviceToUse); }
// Returns the volume name of the default drive
const char *system_cdroms::GetVolumeName(void) { return GetVolume(m_DeviceToUse); }
const char *system_cdroms::CDName(int drive) { return (SDL_CDName(drive)); }
const char *system_cdroms::GetVolume(int drive) {
#if 1 // MACOSX
assert(0);
#else
static char buffer[256];
if (drive < 0 || drive >= m_NumCDRoms)
return NULL;
struct iso_primary_descriptor *ipd;
int cdfd, cdromfmt = 0;
if (!IsCdInDrive(drive))
return NULL;
cdfd = open(CDName(drive), (O_RDONLY | O_EXCL | O_NONBLOCK), 0);
if (cdfd < 0)
return NULL;
// locate at the beginning of the descriptor table
lseek(cdfd, VD_LSN * CDROM_LSECSZ, SEEK_SET);
ipd = (struct iso_primary_descriptor *)buffer;
// walk descriptor table
for (;;) {
unsigned char type;
read(cdfd, buffer, sizeof(buffer));
// make sure it's ISO format
if (cdromfmt == 0) {
if (strncmp(ipd->id, ISO_STANDARD_ID, sizeof(ipd->id)) != 0) {
// not an ISO9660 cdrom
close(cdfd);
return NULL;
} else {
// ISO9660
cdromfmt = 1;
}
}
// type of descriptor
type = (unsigned char)ipd->type[0];
// terminating volume
if (type == ISO_VD_END) {
break;
}
// ISO 9660 filestructure
if (cdromfmt == 1 && type == ISO_VD_PRIMARY && !strncmp(ipd->id, ISO_STANDARD_ID, sizeof(ipd->id))) {
char *ptr;
int len = sizeof(ipd->volume_id);
bcopy(ipd->volume_id, buffer, len);
buffer[len] = '\0';
for (ptr = buffer + len - 1; ptr > buffer; ptr--) {
if (*ptr == ' ') {
*ptr = 0;
}
}
close(cdfd);
return buffer;
}
}
close(cdfd);
#endif
return NULL;
}
// Returns true if a CD is in the default device drive
bool system_cdroms::IsCdInDrive(void) { return IsCdInDrive(m_DeviceToUse); }
bool system_cdroms::IsCdInDrive(int drive) {
// int cdfd,is_in=0;
// struct cdrom_subchnl info;
// struct stat stbuf;
CDstatus cdStat;
SDL_CD cdInfo;
bool retVal = true;
if (drive < 0 || drive >= m_NumCDRoms)
retVal = false;
else {
cdStat = SDL_CDStatus(&cdInfo);
if ((cdStat == CD_TRAYEMPTY) || (cdStat == CD_ERROR))
retVal = false;
} // else
return (retVal);
}
static int read_file_string(FILE *fd, char *buffer, int maxsize) {
int ret;
int size = 0;
ret = fgetc(fd);
while (ret != EOF && size < maxsize) {
if (ret == '\n') {
break;
} else {
// check for a number
if (ret == '\\') {
// we have a number coming
char val = 0;
char c[3];
c[0] = fgetc(fd);
c[1] = fgetc(fd);
c[2] = fgetc(fd);
val = ((c[0] - '0') * 64) + ((c[1] - '0') * 8) + (c[0] - '0');
*buffer = val;
buffer++;
} else {
*buffer = ret;
buffer++;
}
size++;
}
ret = fgetc(fd);
}
*buffer = '\0';
return size;
}
static bool cdrom_CopyFile(char *dst_path, const char *src_path) {
char *buf;
int buf_size;
int dest_desc;
int source_desc;
int n_read;
struct stat sb;
char *cp;
int *ip;
bool return_val = true;
off_t n_read_total = 0;
int last_write_made_hole = 0;
int make_holes = 0;
source_desc = open(src_path, O_RDONLY);
if (source_desc < 0) {
return false;
}
/* Create the new regular file with small permissions initially,
to not create a security hole. */
dest_desc = open(dst_path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (dest_desc < 0) {
return_val = false;
goto ret2;
}
/* Find out the optimal buffer size. */
if (fstat(dest_desc, &sb)) {
return_val = false;
goto ret;
}
buf_size = sb.st_blksize;
/* Make a buffer with space for a sentinel at the end. */
buf = (char *)alloca(buf_size + sizeof(int));
for (;;) {
n_read = read(source_desc, buf, buf_size);
if (n_read < 0) {
return_val = false;
goto ret;
}
if (n_read == 0)
break;
n_read_total += n_read;
ip = 0;
if (write(dest_desc, buf, n_read) < 0) {
return_val = false;
goto ret;
}
}
ret:
if (close(dest_desc) < 0) {
return_val = false;
}
ret2:
if (close(source_desc) < 0) {
return_val = false;
}
return return_val;
}
static bool checkDevMount(const char *device, const char *mntfname, char *mountpoint) {
bool retVal = false;
#if 1 // MACOSX
assert(0);
#else
bool getOut = false;
struct mntent *mntEntry;
FILE *mountFile = setmntent(mntfname, "r");
if (mountFile == NULL) {
mprintf((0, "setmntent(\"%s\", \"r\"); failed! errno == (%d).", mntfname, errno));
Int3();
return (false);
} // if
do {
mntEntry = getmntent(mountFile);
if (mntEntry == NULL)
getOut = true;
else {
if (strcmp(device, mntEntry->mnt_fsname) == 0) // found device?
{
strcpy(mountpoint, mntEntry->mnt_dir); //!!! overflows?
getOut = retVal = true;
} // if
} // else
} while (getOut == false);
endmntent(mountFile);
#endif
return (retVal);
}
bool system_cdroms::IsDeviceMounted(const char *device, char *mountpoint, int max_size) {
#if 1 // MACOSX
int rc = loki_getmountpoint(device, mountpoint, max_size);
return (rc > 0);
#else
return false;
#endif
}
bool system_cdroms::Mount(void) {
if (m_DeviceToUse == -1)
return false;
// make sure the atexit is set so we can properly clear all created tmp dirs
cdrom_set_system_shutdown();
// first check to see if it is mounted
const char *name = CDName(m_DeviceToUse);
char mountpoint[_MAX_PATH];
if (IsDeviceMounted(name, mountpoint, sizeof(mountpoint))) {
strcpy(m_MountedDir, mountpoint);
m_DefaultMounted = true;
return true;
}
/* don't do this.
// Not mounted? Do it ourselves.
// so we now have our directory, try to mount
unsigned long int rwflag = MS_MGC_VAL|MS_RDONLY;
int ret = mount(name,m_MountedDir,"iso9660",rwflag,NULL);
if(ret!=0)
{
switch(errno)
{
case EPERM:
fprintf(stdout,"Unable to mount %s, you are not superuser\n",name);
break;
case ENODEV:
fprintf(stdout,"iso9660 filesystem not supported by kernel\n");
break;
case ENOTBLK:
fprintf(stdout,"Device %s not a block device\n",name);
break;
case EBUSY:
fprintf(stdout,"Device %s already mounted\n",name);
Int3();
break;
case ENAMETOOLONG:
fprintf(stdout,"Attempting to mount %s to %s (but name too long)\n",name,m_MountedDir);
break;
case ENOTDIR:
fprintf(stdout,"%s not a directory\n",m_MountedDir);
break;
default:
//case EINVAL:
//case EFAULT:
//case ENOMEM:
//case EMXIO:
//case EMFILE:
//case ENOENT:
//case EACCES:
fprintf(stdout,"Unknown error %d trying to mount %s\n",errno,name);
break;
}
}else
{
// we mounted!
m_DefaultMounted = true;
LockDevice();//make sure it is locked
return true;
}
*/
return false;
}
bool system_cdroms::UnMount(void) {
if (m_DeviceToUse == -1)
return false;
/*
// find the drive that is mounted
char mountpoint[_MAX_PATH];
const char *name = CDName(m_DeviceToUse);
if (IsDeviceMounted(name,mountpoint,sizeof (mountpoint)) == false)
{
m_DefaultMounted = false;
UnLockDevice();//make sure it is unlocked
return true;//drive isn't mounted anywhere
}
UnLockDevice();//make sure it is unlocked
int ret = umount(name);
if(ret==0)
{
m_DefaultMounted = false;
return true;
}else
{
mprintf((0,"Error %d trying to unmount %s\n",errno,name));
//lock it again...something went wrong
LockDevice();
return false;
}
*/
return false;
}
// Given a device specified by the user, it will make it the
// default device for the system.
bool system_cdroms::SetDefaultDevice(char *device) {
/*
if(m_DeviceToUse!=-1)
{
Int3();
return false;
}
*/
// first find which id the device is
int i, dev_id = -1;
for (i = 0; i < m_NumCDRoms; i++) {
if (strcmp(device, CDName(i)) == 0) {
dev_id = i;
break;
}
}
if (dev_id == -1) {
// printf("CDROM: Default device (%s) not found\n",device);
return false;
}
m_DeviceToUse = dev_id;
QueryDefaultDevice();
return true;
}
// This function will check the default device to see if it
// has a CD in it with the given volume. If it doesn't
// then it will unmount the device (if it is mounted), in preparation
// for a CD switch. If it does have the correct CD in it, then
// it wil be mounted (if it isn't already) and the mount position
// will be given in mountpoint. If it can't mount it will return false;
bool system_cdroms::PrepareForVolume(char *volume, char *mountpoint) {
if (m_DeviceToUse == -1) {
// uh oh, we don't even know what device to use yet...
// so, we'll look at everything we have, checking for volumes
// the first volume successfully returned will be are default
// device.
FindDefaultDevice();
if (m_DeviceToUse == -1) {
// still nothing
return false;
}
}
char *vol = (char *)GetVolumeName();
if (!vol) {
// no CD in the default device drive
return false;
}
// compare the CD in the drive to what we want
if (!strcmp(vol, volume)) {
// this is the CD we want!
// lets make sure it is mounted
bool ret = Mount();
if (ret) {
strcpy(mountpoint, m_MountedDir);
return true;
} else {
// we couldn't mount!
mprintf((0, "CDROM: Unable to mount drive though we must have it mounted\n"));
Int3();
return false;
}
}
// ok, the CD in there is NOT what we want
// lets unmount the drive so the user can switch CDs
bool ret = UnMount();
if (!ret) {
mprintf((0, "Unable to unmount drive\n"));
}
return false;
}
// This function will go through our list of devices
// when it comes across the first CD-ROM (which can only be
// detected when a CD is in the drive), it will make it the default
// device.
void system_cdroms::FindDefaultDevice(void) {
if (m_DeviceToUse != -1)
return;
// 0 is SDL's default CD-ROM drive id. But use -1 if there are none.
if (GetNumCDRoms() <= 0) {
m_DeviceToUse = -1;
mprintf((0, "CDROM: No drives found to be made default!"));
return;
} // if
else // there WAS at least one drive...
{
m_DeviceToUse = 0; // default device.
mprintf((0, "CDROM: Making device \"%s\" default CD-ROM drive.", CDName(m_DeviceToUse)));
} // else
// we found the device we want to use for our CD-ROM.
// now we need to query some information about the default drive
// like if it's currently mounted (if so where, and save that info),
// and if it's not mounted, then we need to create a mountpoint for it and
// use that
QueryDefaultDevice();
}
// Queries the settings for the default drive
// First it checks to see if the drive is already mounted
// If it is, it's mountpoint is saved and we continue
// If it isn't mounted, the it will create a mountpoint for the device
// and mount it there.
void system_cdroms::QueryDefaultDevice(void) {
if (m_DeviceToUse == -1) {
Int3();
return;
}
// first check to see if it is already mounted
char mountpoint[_MAX_PATH];
bool ismounted = false;
const char *device = CDName(m_DeviceToUse);
if (IsDeviceMounted(device, mountpoint, sizeof(mountpoint))) {
mprintf((0, "CDROM: Default device already mounted at %s...\n", mountpoint));
// save the mountpoint for use
strcpy(m_MountedDir, mountpoint);
m_DefaultMounted = true;
return;
}
#if 0 // rcg10052000 BAD! BADBADBAD!
// see if there's a default dir for mounting this thing.
if (checkDevMount(device, "/etc/fstab", m_MountedDir) == false)
{
// otherwise, we'll make a mountpoint and mount it
// remember that the current working directory, unless overridden
// by the user, is "$HOME/.loki/", so this is "okay", I guess.
strcpy(mountpoint, loki_getprefpath());
char *dptr = mountpoint + strlen(mountpoint);
char *sptr = (char *) device;
*dptr = 'T'; dptr++;
*dptr = 'M'; dptr++;
*dptr = 'P'; dptr++;
while(*sptr)
{
if(*sptr!='/')
{
*dptr = *sptr;
dptr++;
}
sptr++;
}
*dptr = '0';dptr++;
*dptr = '\0';
dptr = mountpoint + strlen(mountpoint) - 1;
// now keep attempting to make the directory until we do or can't even try
bool bail = true;
while( ((*dptr)-'0')<=9 )
{
if(!ddio_DirExists(mountpoint))
{
if(ddio_CreateDir(mountpoint))
{
// we did it
bail = false;
break;
}
}else
{
*dptr = (*dptr)++;
}
}
if(bail)
{
Error("Unable to create a mountpoint for device %s\n", device);
exit(1);
return;
}
// save the mountpoint for use
mprintf((0,"CDROM: Mountpoint created for device %s at %s\n",device,mountpoint));
strcpy(m_MountedDir,mountpoint);
m_CreatedMountPoint = true;
} // if
Mount();
#endif
}
// resets the device mountpoint. If the mountpoint was created, it will
// unmount the drive and remove the mountpoint directory
void system_cdroms::ResetMountpoint(void) {
if (!m_CreatedMountPoint)
return;
UnMount();
ddio_RemoveDir(m_MountedDir);
}
// Locks the CD-ROM
void system_cdroms::LockDevice(void) {
/*
if(m_DeviceToUse==-1)
return;
int retval;
int fileid;
fileid = open(m_CDList[m_DeviceToUse]->name, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
if(fileid>=0)
{
int arg = 1;
//retval = ioctl(fileid,CDROM_LOCKDOOR,arg);
retval = ioctl(fileid,CDC_LOCK,arg);
if(retval<0)
{
mprintf((0,"CDROM: ioctl error locking drive (%d)\n",retval));
}
close(fileid);
}
*/
}
// UnLocks the CD-ROM
void system_cdroms::UnLockDevice(void) {
/*
if(m_DeviceToUse==-1)
return;
int retval;
int fileid;
fileid = open(m_CDList[m_DeviceToUse]->name, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
if(fileid>=0)
{
int arg = 0;
//retval = ioctl(fileid,CDROM_LOCKDOOR,arg);
retval = ioctl(fileid,CDC_LOCK,arg);
if(retval<0)
{
mprintf((0,"CDROM: ioctl error unlocking drive (%d)\n",retval));
}
close(fileid);
}
*/
}
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