src/Unix/sys_unix.cpp

/*
 *  sys_unix.cpp - System dependent routines, Unix implementation
 *
 *  Basilisk II (C) Christian Bauer
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#include <sys/ioctl.h>
#include <sys/stat.h>
#include <errno.h>

#ifdef HAVE_AVAILABILITYMACROS_H
#include <AvailabilityMacros.h>
#endif

#ifdef __linux__
#include <sys/mount.h>
#include <linux/cdrom.h>
#include <linux/fd.h>
#include <linux/major.h>
#include <linux/kdev_t.h>
#include <dirent.h>
#include <limits.h>
#endif

#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <sys/cdio.h>
#endif

#if defined __APPLE__ && defined __MACH__
#include <sys/disk.h>
#if (defined AQUA || defined HAVE_FRAMEWORK_COREFOUNDATION)
#ifndef __MACOSX__
#define __MACOSX__ MAC_OS_X_VERSION_MIN_REQUIRED
#endif
#endif
#endif

#include "main.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "sys.h"

#define DEBUG 0
#include "debug.h"


// File handles are pointers to these structures
struct file_handle {
        char *name;                     // Copy of device/file name
        int fd;
        bool is_file;           // Flag: plain file or /dev/something?
        bool is_floppy;         // Flag: floppy device
        bool is_cdrom;          // Flag: CD-ROM device
        bool read_only;         // Copy of Sys_open() flag
        loff_t start_byte;      // Size of file header (if any)
        loff_t file_size;       // Size of file data (only valid if is_file is true)
        bool is_media_present;          // Flag: media is inserted and available

#if defined(__linux__)
        int cdrom_cap;          // CD-ROM capability flags (only valid if is_cdrom is true)
#elif defined(__FreeBSD__)
        struct ioc_capability cdrom_cap;
#elif defined(__APPLE__) && defined(__MACH__)
        char    *ioctl_name;    // For CDs on OS X - a device for special ioctls
        int             ioctl_fd;
#endif
};

// Open file handles
struct open_file_handle {
        file_handle *fh;
        open_file_handle *next;
};
static open_file_handle *open_file_handles = NULL;

// File handle of first floppy drive (for SysMountFirstFloppy())
static file_handle *first_floppy = NULL;

// Prototypes
static void cdrom_close(file_handle *fh);
static bool cdrom_open(file_handle *fh, const char *path = NULL);


/*
 *  Initialization
 */

void SysInit(void)
{
#if defined __MACOSX__
        extern void DarwinSysInit(void);
        DarwinSysInit();
#endif
}


/*
 *  Deinitialization
 */

void SysExit(void)
{
#if defined __MACOSX__
        extern void DarwinSysExit(void);
        DarwinSysExit();
#endif
}


/*
 *  Manage open file handles
 */

static void sys_add_file_handle(file_handle *fh)
{
        open_file_handle *p = new open_file_handle;
        p->fh = fh;
        p->next = open_file_handles;
        open_file_handles = p;
}

static void sys_remove_file_handle(file_handle *fh)
{
        open_file_handle *p = open_file_handles;
        open_file_handle *q = NULL;

        while (p) {
                if (p->fh == fh) {
                        if (q)
                                q->next = p->next;
                        else
                                open_file_handles = p->next;
                        delete p;
                        break;
                }
                q = p;
                p = p->next;
        }
}


/*
 *  Account for media that has just arrived
 */

void SysMediaArrived(const char *path, int type)
{
        // Replace the "cdrom" entry (we are polling, it's unique)
        if (type == MEDIA_CD && !PrefsFindBool("nocdrom"))
                PrefsReplaceString("cdrom", path);

        // Wait for media to be available for reading
        if (open_file_handles) {
                const int MAX_WAIT = 5;
                for (int i = 0; i < MAX_WAIT; i++) {
                        if (access(path, R_OK) == 0)
                                break;
                        switch (errno) {
                        case ENOENT: // Unlikely
                        case EACCES: // MacOS X is mounting the media
                                sleep(1);
                                continue;
                        }
                        printf("WARNING: Cannot access %s (%s)\n", path, strerror(errno));
                        return;
                }
        }

        for (open_file_handle *p = open_file_handles; p != NULL; p = p->next) {
                file_handle * const fh = p->fh;

                // Re-open CD-ROM device
                if (fh->is_cdrom && type == MEDIA_CD) {
                        cdrom_close(fh);
                        if (cdrom_open(fh, path)) {
                                fh->is_media_present = true;
                                MountVolume(fh);
                        }
                }
        }
}


/*
 *  Account for media that has just been removed
 */

void SysMediaRemoved(const char *path, int type)
{
        if ((type & MEDIA_REMOVABLE) != MEDIA_CD)
                return;

        for (open_file_handle *p = open_file_handles; p != NULL; p = p->next) {
                file_handle * const fh = p->fh;

                // Mark media as not available
                if (!fh->is_cdrom || !fh->is_media_present)
                        continue;
                if (fh->name && strcmp(fh->name, path) == 0) {
                        fh->is_media_present = false;
                        break;
                }
#if defined __MACOSX__
                if (fh->ioctl_name && strcmp(fh->ioctl_name, path) == 0) {
                        fh->is_media_present = false;
                        break;
                }
#endif
        }
}


/*
 *  Mount first floppy disk
 */

void SysMountFirstFloppy(void)
{
        if (first_floppy)
                MountVolume(first_floppy);
}


/*
 *  This gets called when no "floppy" prefs items are found
 *  It scans for available floppy drives and adds appropriate prefs items
 */

void SysAddFloppyPrefs(void)
{
#if defined(__linux__)
        DIR *fd_dir = opendir("/dev/floppy");
        if (fd_dir) {
                struct dirent *floppy_dev;
                while ((floppy_dev = readdir(fd_dir)) != NULL) {
                        if (strstr(floppy_dev->d_name, "u1440") != NULL) {
                                char fd_dev[20];
                                sprintf(fd_dev, "/dev/floppy/%s", floppy_dev->d_name);
                                PrefsAddString("floppy", fd_dev);
                        }
                }
                closedir(fd_dir);
        } else {
                PrefsAddString("floppy", "/dev/fd0");
                PrefsAddString("floppy", "/dev/fd1");
        }
#elif defined(__NetBSD__)
        PrefsAddString("floppy", "/dev/fd0a");
        PrefsAddString("floppy", "/dev/fd1a");
#elif defined(__APPLE__) && defined(__MACH__)
  #if defined(AQUA) || defined(HAVE_FRAMEWORK_COREFOUNDATION)
        extern  void DarwinAddFloppyPrefs(void);

        DarwinAddFloppyPrefs();
  #else
        // Until I can convince the other guys that my Darwin code is useful,
        // we just add something safe (a non-existant device):
        PrefsAddString("floppy", "/dev/null");
  #endif
#else
        PrefsAddString("floppy", "/dev/fd0");
        PrefsAddString("floppy", "/dev/fd1");
#endif
}


/*
 *  This gets called when no "disk" prefs items are found
 *  It scans for available HFS volumes and adds appropriate prefs items
 *      On OS X, we could do the same, but on an OS X machine I think it is
 *      very unlikely that any mounted volumes would contain a system which
 *      is old enough to boot a 68k Mac, so we just do nothing here for now.
 */

void SysAddDiskPrefs(void)
{
#ifdef __linux__
        FILE *f = fopen("/etc/fstab", "r");
        if (f) {
                char line[256];
                while(fgets(line, 255, f)) {
                        // Read line
                        int len = strlen(line);
                        if (len == 0 || line[0] == '#')
                                continue;
                        line[len-1] = 0;

                        // Parse line
                        char *dev, *mnt_point, *fstype;
                        if (sscanf(line, "%as %as %as", &dev, &mnt_point, &fstype) == 3) {
                                if (strcmp(fstype, "hfs") == 0)
                                        PrefsAddString("disk", dev);
                        }
                        free(dev); free(mnt_point); free(fstype);
                }
                fclose(f);
        }
#endif
}


/*
 *  This gets called when no "cdrom" prefs items are found
 *  It scans for available CD-ROM drives and adds appropriate prefs items
 */

void SysAddCDROMPrefs(void)
{
        // Don't scan for drives if nocdrom option given
        if (PrefsFindBool("nocdrom"))
                return;

#if defined(__linux__)
        if (access("/dev/.devfsd", F_OK) < 0)
                PrefsAddString("cdrom", "/dev/cdrom");
        else {
                DIR *cd_dir = opendir("/dev/cdroms");
                if (cd_dir) {
                        struct dirent *cdrom_dev;
                        while ((cdrom_dev = readdir(cd_dir)) != NULL) {
                                if (strcmp(cdrom_dev->d_name, ".") != 0 && strcmp(cdrom_dev->d_name, "..") != 0) {
                                        char cd_dev[20];
                                        sprintf(cd_dev, "/dev/cdroms/%s", cdrom_dev->d_name);
                                        PrefsAddString("cdrom", cd_dev);
                                }
                        }
                        closedir(cd_dir);
                }
        }
#elif defined __MACOSX__
        // There is no predefined path for CD-ROMs on MacOS X. Rather, we
        // define a single fake CD-ROM entry for the emulated MacOS.
        // XXX this means we handle only CD-ROM drive at a time, wherever
        // the disk is, the latest one is used.
        PrefsAddString("cdrom", "/dev/poll/cdrom");
#elif defined(__FreeBSD__) || defined(__NetBSD__)
        PrefsAddString("cdrom", "/dev/cd0c");
#endif
}


/*
 *  Add default serial prefs (must be added, even if no ports present)
 */

void SysAddSerialPrefs(void)
{
#if defined(__linux__)
        if (access("/dev/.devfsd", F_OK) < 0) {
                PrefsAddString("seriala", "/dev/ttyS0");
                PrefsAddString("serialb", "/dev/ttyS1");
        } else {
                PrefsAddString("seriala", "/dev/tts/0");
                PrefsAddString("serialb", "/dev/tts/1");
        }
#elif defined(__FreeBSD__)
        PrefsAddString("seriala", "/dev/cuaa0");
        PrefsAddString("serialb", "/dev/cuaa1");
#elif defined(__NetBSD__)
        PrefsAddString("seriala", "/dev/tty00");
        PrefsAddString("serialb", "/dev/tty01");
#elif defined(__APPLE__) && defined(__MACH__)
  #if defined(AQUA) || defined(HAVE_FRAMEWORK_COREFOUNDATION)
        extern  void DarwinAddSerialPrefs(void);

        DarwinAddSerialPrefs();
  #else
        // Until I can convince the other guys that my Darwin code is useful,
        // we just add something safe (non-existant devices):
        PrefsAddString("seriala", "/dev/null");
        PrefsAddString("serialb", "/dev/null");
  #endif
#endif
}


/*
 *  Open CD-ROM device and initialize internal data
 */

static bool cdrom_open_1(file_handle *fh)
{
#if defined __MACOSX__
        // In OS X, the device name is OK for sending ioctls to,
        // but not for reading raw CDROM data from.
        // (it seems to have extra data padded in)
        //
        // So, we keep the already opened file handle,
        // and open a slightly different file for CDROM data 
        //
        fh->ioctl_fd = fh->fd;
        fh->ioctl_name = fh->name;
        fh->fd = -1;
        fh->name = (char *)malloc(strlen(fh->ioctl_name) + 3);
        if (fh->name) {
                strcpy(fh->name, fh->ioctl_name);
                strcat(fh->name, "s1");
                fh->fd = open(fh->name, O_RDONLY, O_NONBLOCK);
        }
        if (fh->ioctl_fd < 0)
                return false;
#endif
        return true;
}

bool cdrom_open(file_handle *fh, const char *path)
{
        if (path)
                fh->name = strdup(path);
        fh->fd = open(fh->name, O_RDONLY, O_NONBLOCK);
        fh->start_byte = 0;
        if (!cdrom_open_1(fh))
                return false;
        return fh->fd >= 0;
}


/*
 *  Close a CD-ROM device
 */

void cdrom_close(file_handle *fh)
{
        if (fh->fd >= 0) {
                close(fh->fd);
                fh->fd = -1;
        }
        if (fh->name) {
                free(fh->name);
                fh->name = NULL;
        }
#if defined __MACOSX__
        if (fh->ioctl_fd >= 0) {
                close(fh->ioctl_fd);
                fh->ioctl_fd = -1;
        }
        if (fh->ioctl_name) {
                free(fh->ioctl_name);
                fh->ioctl_name = NULL;
        }
#endif
}


/*
 *  Check if device is a mounted HFS volume, get mount name
 */

static bool is_drive_mounted(const char *dev_name, char *mount_name)
{
#ifdef __linux__
        FILE *f = fopen("/proc/mounts", "r");
        if (f) {
                char line[256];
                while(fgets(line, 255, f)) {
                        // Read line
                        int len = strlen(line);
                        if (len == 0)
                                continue;
                        line[len-1] = 0;

                        // Parse line
                        if (strncmp(line, dev_name, strlen(dev_name)) == 0) {
                                mount_name[0] = 0;
                                char *dummy;
                                sscanf(line, "%as %s", &dummy, mount_name);
                                free(dummy);
                                fclose(f);
                                return true;
                        }
                }
                fclose(f);
        }
#endif
        return false;
}


/*
 *  Open file/device, create new file handle (returns NULL on error)
 */

void *Sys_open(const char *name, bool read_only)
{
        bool is_file = strncmp(name, "/dev/", 5) != 0;
#if defined(__FreeBSD__)
                        // SCSI                             IDE
        bool is_cdrom = strncmp(name, "/dev/cd", 7) == 0 || strncmp(name, "/dev/acd", 8) == 0;
#else
        bool is_cdrom = strncmp(name, "/dev/cd", 7) == 0;
#endif
        bool is_floppy = strncmp(name, "/dev/fd", 7) == 0;

        bool is_polled_media = strncmp(name, "/dev/poll/", 10) == 0;
        if (is_floppy) // Floppy open fails if there's no disk inserted
                is_polled_media = true;

#if defined __MACOSX__
        // There is no set filename in /dev which is the cdrom,
        // so we have to see if it is any of the devices that we found earlier
        {
                int index = 0;
                const char *str;
                while ((str = PrefsFindString("cdrom", index++)) != NULL) {
                        if (is_polled_media || strcmp(str, name) == 0) {
                                is_cdrom = true;
                                read_only = true;
                                break;
                        }
                }
        }
#endif

        D(bug("Sys_open(%s, %s)\n", name, read_only ? "read-only" : "read/write"));

        // Check if write access is allowed, set read-only flag if not
        if (!read_only && access(name, W_OK))
                read_only = true;

        // Print warning message and eventually unmount drive when this is an HFS volume mounted under Linux (double mounting will corrupt the volume)
        char mount_name[256];
        if (!is_file && !read_only && is_drive_mounted(name, mount_name)) {
                char str[512];
                sprintf(str, GetString(STR_VOLUME_IS_MOUNTED_WARN), mount_name);
                WarningAlert(str);
                sprintf(str, "umount %s", mount_name);
                if (system(str)) {
                        sprintf(str, GetString(STR_CANNOT_UNMOUNT_WARN), mount_name, strerror(errno));
                        WarningAlert(str);
                        return NULL;
                }
        }

        // Open file/device
#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__MACOSX__)
        int fd = open(name, (read_only ? O_RDONLY : O_RDWR) | (is_cdrom ? O_NONBLOCK : 0));
#else
        int fd = open(name, read_only ? O_RDONLY : O_RDWR);
#endif
        if (fd < 0 && !read_only) {
                // Read-write failed, try read-only
                read_only = true;
                fd = open(name, O_RDONLY);
        }
        if (fd >= 0 || is_polled_media) {
                file_handle *fh = new file_handle;
                fh->name = strdup(name);
                fh->fd = fd;
                fh->is_file = is_file;
                fh->read_only = read_only;
                fh->start_byte = 0;
                fh->is_floppy = is_floppy;
                fh->is_cdrom = is_cdrom;
                fh->is_media_present = false;
#if defined __MACOSX__
                fh->ioctl_fd = -1;
                fh->ioctl_name = NULL;
#endif
                if (fh->is_file) {
                        fh->is_media_present = true;
                        // Detect disk image file layout
                        loff_t size = 0;
                        size = lseek(fd, 0, SEEK_END);
                        uint8 data[256];
                        lseek(fd, 0, SEEK_SET);
                        read(fd, data, 256);
                        FileDiskLayout(size, data, fh->start_byte, fh->file_size);
                } else {
                        struct stat st;
                        if (fstat(fd, &st) == 0) {
                                fh->is_media_present = true;
                                if (S_ISBLK(st.st_mode)) {
                                        fh->is_cdrom = is_cdrom;
#if defined(__linux__)
                                        fh->is_floppy = (MAJOR(st.st_rdev) == FLOPPY_MAJOR);
#ifdef CDROM_GET_CAPABILITY
                                        if (is_cdrom) {
                                                fh->cdrom_cap = ioctl(fh->fd, CDROM_GET_CAPABILITY);
                                                if (fh->cdrom_cap < 0)
                                                        fh->cdrom_cap = 0;
                                        }
#else
                                        fh->cdrom_cap = 0;
#endif
#elif defined(__FreeBSD__)
                                        fh->is_floppy = ((st.st_rdev >> 16) == 2);
#ifdef CDIOCCAPABILITY
                                        if (is_cdrom) {
                                                if (ioctl(fh->fd, CDIOCCAPABILITY, &fh->cdrom_cap) < 0)
                                                        memset(&fh->cdrom_cap, 0, sizeof(fh->cdrom_cap));
                                        }
#else
                                        fh->cdrom_cap = 0;
#endif
#elif defined(__NetBSD__)
                                        fh->is_floppy = ((st.st_rdev >> 16) == 2);
#endif
                                }
#if defined __MACOSX__
                                if (is_cdrom) {
                                        fh->is_cdrom = true;
                                        fh->is_floppy = false;
                                        if (cdrom_open_1(fh))
                                                fh->is_media_present = true;
                                }
#endif
                        }
                }
                if (fh->is_floppy && first_floppy == NULL)
                        first_floppy = fh;
                sys_add_file_handle(fh);
                return fh;
        } else {
                printf("WARNING: Cannot open %s (%s)\n", name, strerror(errno));
                return NULL;
        }
}


/*
 *  Close file/device, delete file handle
 */

void Sys_close(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        sys_remove_file_handle(fh);

        if (fh->is_cdrom)
                cdrom_close(fh);
        if (fh->fd >= 0)
                close(fh->fd);
        if (fh->name)
                free(fh->name);
        delete fh;
}


/*
 *  Read "length" bytes from file/device, starting at "offset", to "buffer",
 *  returns number of bytes read (or 0)
 */

size_t Sys_read(void *arg, void *buffer, loff_t offset, size_t length)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return 0;

        // Seek to position
        if (lseek(fh->fd, offset + fh->start_byte, SEEK_SET) < 0)
                return 0;

        // Read data
        return read(fh->fd, buffer, length);
}


/*
 *  Write "length" bytes from "buffer" to file/device, starting at "offset",
 *  returns number of bytes written (or 0)
 */

size_t Sys_write(void *arg, void *buffer, loff_t offset, size_t length)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return 0;

        // Seek to position
        if (lseek(fh->fd, offset + fh->start_byte, SEEK_SET) < 0)
                return 0;

        // Write data
        return write(fh->fd, buffer, length);
}


/*
 *  Return size of file/device (minus header)
 */

loff_t SysGetFileSize(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        if (fh->is_file)
                return fh->file_size;
        else {
#if defined(__linux__)
                long blocks;
                if (ioctl(fh->fd, BLKGETSIZE, &blocks) < 0)
                        return 0;
                D(bug(" BLKGETSIZE returns %d blocks\n", blocks));
                return (loff_t)blocks * 512;
#elif defined __MACOSX__
                uint32 block_size;
                if (ioctl(fh->ioctl_fd, DKIOCGETBLOCKSIZE, &block_size) < 0)
                        return 0;
                D(bug(" DKIOCGETBLOCKSIZE returns %lu bytes\n", (unsigned long)block_size));
                uint64 block_count;
                if (ioctl(fh->ioctl_fd, DKIOCGETBLOCKCOUNT, &block_count) < 0)
                        return 0;
                D(bug(" DKIOCGETBLOCKCOUNT returns %llu blocks\n", (unsigned long long)block_count));
                return block_count * block_size;
#else
                return lseek(fh->fd, 0, SEEK_END) - fh->start_byte;
#endif
        }
}


/*
 *  Eject volume (if applicable)
 */

void SysEject(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

#if defined(__linux__)
        if (fh->is_floppy) {
                if (fh->fd >= 0) {
                        fsync(fh->fd);
                        ioctl(fh->fd, FDFLUSH);
                        ioctl(fh->fd, FDEJECT);
                        close(fh->fd);  // Close and reopen so the driver will see the media change
                }
                fh->fd = open(fh->name, fh->read_only ? O_RDONLY : O_RDWR);
        } else if (fh->is_cdrom) {
                ioctl(fh->fd, CDROMEJECT);
                close(fh->fd);  // Close and reopen so the driver will see the media change
                fh->fd = open(fh->name, O_RDONLY | O_NONBLOCK);
        }
#elif defined(__FreeBSD__) || defined(__NetBSD__)
        if (fh->is_floppy) {
                fsync(fh->fd);
        } else if (fh->is_cdrom) {
                ioctl(fh->fd, CDIOCEJECT);
                close(fh->fd);  // Close and reopen so the driver will see the media change
                fh->fd = open(fh->name, O_RDONLY | O_NONBLOCK);
        }
#elif defined(__APPLE__) && defined(__MACH__)
        if (fh->is_cdrom && fh->is_media_present) {
                close(fh->fd);
                fh->fd = -1;
                if (ioctl(fh->ioctl_fd, DKIOCEJECT) < 0) {
                        D(bug(" DKIOCEJECT failed on file %s: %s\n",
                                   fh->ioctl_name, strerror(errno)));

                        // If we are running MacOS X, the device may be in busy
                        // state because the Finder has mounted the disk
                        close(fh->ioctl_fd);
                        fh->ioctl_fd = -1;

                        // Try to use "diskutil eject" but it can take up to 5
                        // seconds to complete
                        static const char eject_cmd[] = "/usr/sbin/diskutil eject %s 2>&1 >/dev/null";
                        char *cmd = (char *)alloca(strlen(eject_cmd) + strlen(fh->ioctl_name) + 1);
                        sprintf(cmd, eject_cmd, fh->ioctl_name);
                        system(cmd);
                }
                fh->is_media_present = false;
        }
#endif
}


/*
 *  Format volume (if applicable)
 */

bool SysFormat(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        //!!
        return true;
}


/*
 *  Check if file/device is read-only (this includes the read-only flag on Sys_open())
 */

bool SysIsReadOnly(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

#if defined(__linux__)
        if (fh->is_floppy) {
                if (fh->fd >= 0) {
                        struct floppy_drive_struct stat;
                        ioctl(fh->fd, FDGETDRVSTAT, &stat);
                        return !(stat.flags & FD_DISK_WRITABLE);
                } else
                        return true;
        } else
#endif
                return fh->read_only;
}


/*
 *  Check if the given file handle refers to a fixed or a removable disk
 */

bool SysIsFixedDisk(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        if (fh->is_file)
                return true;
        else if (fh->is_floppy || fh->is_cdrom)
                return false;
        else
                return true;
}


/*
 *  Check if a disk is inserted in the drive (always true for files)
 */

bool SysIsDiskInserted(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file) {
                return true;

#if defined(__linux__)
        } else if (fh->is_floppy) {
                char block[512];
                lseek(fh->fd, 0, SEEK_SET);
                ssize_t actual = read(fh->fd, block, 512);
                if (actual < 0) {
                        close(fh->fd);  // Close and reopen so the driver will see the media change
                        fh->fd = open(fh->name, fh->read_only ? O_RDONLY : O_RDWR);
                        actual = read(fh->fd, block, 512);
                }
                return actual == 512;
        } else if (fh->is_cdrom) {
#ifdef CDROM_MEDIA_CHANGED
                if (fh->cdrom_cap & CDC_MEDIA_CHANGED) {
                        // If we don't do this, all attempts to read from a disc fail
                        // once the tray has been opened (altough the TOC reads fine).
                        // Can somebody explain this to me?
                        if (ioctl(fh->fd, CDROM_MEDIA_CHANGED) == 1) {
                                close(fh->fd);
                                fh->fd = open(fh->name, O_RDONLY | O_NONBLOCK);
                        }
                }
#endif
#ifdef CDROM_DRIVE_STATUS
                if (fh->cdrom_cap & CDC_DRIVE_STATUS) {
                        return ioctl(fh->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) == CDS_DISC_OK;
                }
#endif
                cdrom_tochdr header;
                return ioctl(fh->fd, CDROMREADTOCHDR, &header) == 0;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
        } else if (fh->is_floppy) {
                return false;   //!!
        } else if (fh->is_cdrom) {
                struct ioc_toc_header header;
                return ioctl(fh->fd, CDIOREADTOCHEADER, &header) == 0;
#elif defined __MACOSX__
        } else if (fh->is_cdrom || fh->is_floppy) {
                return fh->is_media_present;
#endif

        } else
                return true;
}


/*
 *  Prevent medium removal (if applicable)
 */

void SysPreventRemoval(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

#if defined(__linux__) && defined(CDROM_LOCKDOOR)
        if (fh->is_cdrom)
                ioctl(fh->fd, CDROM_LOCKDOOR, 1);       
#endif
}


/*
 *  Allow medium removal (if applicable)
 */

void SysAllowRemoval(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

#if defined(__linux__) && defined(CDROM_LOCKDOOR)
        if (fh->is_cdrom)
                ioctl(fh->fd, CDROM_LOCKDOOR, 0);       
#endif
}


/*
 *  Read CD-ROM TOC (binary MSF format, 804 bytes max.)
 */

bool SysCDReadTOC(void *arg, uint8 *toc)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                uint8 *p = toc + 2;

                // Header
                cdrom_tochdr header;
                if (ioctl(fh->fd, CDROMREADTOCHDR, &header) < 0)
                        return false;
                *p++ = header.cdth_trk0;
                *p++ = header.cdth_trk1;

                // Tracks
                cdrom_tocentry entry;
                for (int i=header.cdth_trk0; i<=header.cdth_trk1; i++) {
                        entry.cdte_track = i;
                        entry.cdte_format = CDROM_MSF;
                        if (ioctl(fh->fd, CDROMREADTOCENTRY, &entry) < 0)
                                return false;
                        *p++ = 0;
                        *p++ = (entry.cdte_adr << 4) | entry.cdte_ctrl;
                        *p++ = entry.cdte_track;
                        *p++ = 0;
                        *p++ = 0;
                        *p++ = entry.cdte_addr.msf.minute;
                        *p++ = entry.cdte_addr.msf.second;
                        *p++ = entry.cdte_addr.msf.frame;
                }

                // Leadout track
                entry.cdte_track = CDROM_LEADOUT;
                entry.cdte_format = CDROM_MSF;
                if (ioctl(fh->fd, CDROMREADTOCENTRY, &entry) < 0)
                        return false;
                *p++ = 0;
                *p++ = (entry.cdte_adr << 4) | entry.cdte_ctrl;
                *p++ = entry.cdte_track;
                *p++ = 0;
                *p++ = 0;
                *p++ = entry.cdte_addr.msf.minute;
                *p++ = entry.cdte_addr.msf.second;
                *p++ = entry.cdte_addr.msf.frame;

                // TOC size
                int toc_size = p - toc;
                *toc++ = toc_size >> 8;
                *toc++ = toc_size & 0xff;
                return true;
#elif defined __MACOSX__ && defined MAC_OS_X_VERSION_10_2
                if (fh->is_media_present) {
                        extern bool DarwinCDReadTOC(char *name, uint8 *toc);
                        return DarwinCDReadTOC(fh->name, toc);
                }
                return false;
#elif defined(__FreeBSD__)
                uint8 *p = toc + 2;

                // Header
                struct ioc_toc_header header;
                if (ioctl(fh->fd, CDIOREADTOCHEADER, &header) < 0)
                        return false;
                *p++ = header.starting_track;
                *p++ = header.ending_track;

                // Tracks
                struct ioc_read_toc_single_entry entry;
                for (int i=header.starting_track; i<=header.ending_track; i++) {
                        entry.track = i;
                        entry.address_format = CD_MSF_FORMAT;
                        if (ioctl(fh->fd, CDIOREADTOCENTRY, &entry) < 0)
                                return false;
                        *p++ = 0;
                        *p++ = (entry.entry.addr_type << 4) | entry.entry.control;
                        *p++ = entry.entry.track;
                        *p++ = 0;
                        *p++ = 0;
                        *p++ = entry.entry.addr.msf.minute;
                        *p++ = entry.entry.addr.msf.second;
                        *p++ = entry.entry.addr.msf.frame;
                }

                // Leadout track
                entry.track = CD_TRACK_INFO;
                entry.address_format = CD_MSF_FORMAT;
                if (ioctl(fh->fd, CDIOREADTOCENTRY, &entry) < 0)
                        return false;
                *p++ = 0;
                *p++ = (entry.entry.addr_type << 4) | entry.entry.control;
                *p++ = entry.entry.track;
                *p++ = 0;
                *p++ = 0;
                *p++ = entry.entry.addr.msf.minute;
                *p++ = entry.entry.addr.msf.second;
                *p++ = entry.entry.addr.msf.frame;

                // TOC size
                int toc_size = p - toc;
                *toc++ = toc_size >> 8;
                *toc++ = toc_size & 0xff;
                return true;
#elif defined(__NetBSD__)
                uint8 *p = toc + 2;

                // Header
                struct ioc_toc_header header;
                if (ioctl(fh->fd, CDIOREADTOCHEADER, &header) < 0)
                        return false;
                *p++ = header.starting_track;
                *p++ = header.ending_track;

                // Tracks (this is nice... :-)
                struct ioc_read_toc_entry entries;
                entries.address_format = CD_MSF_FORMAT;
                entries.starting_track = 1;
                entries.data_len = 800;
                entries.data = (cd_toc_entry *)p;
                if (ioctl(fh->fd, CDIOREADTOCENTRIES, &entries) < 0)
                        return false;

                // TOC size
                int toc_size = p - toc;
                *toc++ = toc_size >> 8;
                *toc++ = toc_size & 0xff;
                return true;
#else
                return false;
#endif
        } else
                return false;
}


/*
 *  Read CD-ROM position data (Sub-Q Channel, 16 bytes, see SCSI standard)
 */

bool SysCDGetPosition(void *arg, uint8 *pos)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_subchnl chan;
                chan.cdsc_format = CDROM_MSF;
                if (ioctl(fh->fd, CDROMSUBCHNL, &chan) < 0)
                        return false;
                *pos++ = 0;
                *pos++ = chan.cdsc_audiostatus;
                *pos++ = 0;
                *pos++ = 12;    // Sub-Q data length
                *pos++ = 0;
                *pos++ = (chan.cdsc_adr << 4) | chan.cdsc_ctrl;
                *pos++ = chan.cdsc_trk;
                *pos++ = chan.cdsc_ind;
                *pos++ = 0;
                *pos++ = chan.cdsc_absaddr.msf.minute;
                *pos++ = chan.cdsc_absaddr.msf.second;
                *pos++ = chan.cdsc_absaddr.msf.frame;
                *pos++ = 0;
                *pos++ = chan.cdsc_reladdr.msf.minute;
                *pos++ = chan.cdsc_reladdr.msf.second;
                *pos++ = chan.cdsc_reladdr.msf.frame;
                return true;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                struct ioc_read_subchannel chan;
                chan.data_format = CD_MSF_FORMAT;
                chan.address_format = CD_MSF_FORMAT;
                chan.track = CD_CURRENT_POSITION;
                if (ioctl(fh->fd, CDIOCREADSUBCHANNEL, &chan) < 0)
                        return false;
                *pos++ = 0;
                *pos++ = chan.data->header.audio_status;
                *pos++ = 0;
                *pos++ = 12;    // Sub-Q data length
                *pos++ = 0;
                *pos++ = (chan.data->what.position.addr_type << 4) | chan.data->what.position.control;
                *pos++ = chan.data->what.position.track_number;
                *pos++ = chan.data->what.position.index_number;
                *pos++ = 0;
                *pos++ = chan.data->what.position.absaddr.msf.minute;
                *pos++ = chan.data->what.position.absaddr.msf.second;
                *pos++ = chan.data->what.position.absaddr.msf.frame;
                *pos++ = 0;
                *pos++ = chan.data->what.position.reladdr.msf.minute;
                *pos++ = chan.data->what.position.reladdr.msf.second;
                *pos++ = chan.data->what.position.reladdr.msf.frame;
                return true;
#else
                return false;
#endif
        } else
                return false;
}


/*
 *  Play CD audio
 */

bool SysCDPlay(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, uint8 end_m, uint8 end_s, uint8 end_f)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_msf play;
                play.cdmsf_min0 = start_m;
                play.cdmsf_sec0 = start_s;
                play.cdmsf_frame0 = start_f;
                play.cdmsf_min1 = end_m;
                play.cdmsf_sec1 = end_s;
                play.cdmsf_frame1 = end_f;
                return ioctl(fh->fd, CDROMPLAYMSF, &play) == 0;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                struct ioc_play_msf play;
                play.start_m = start_m;
                play.start_s = start_s;
                play.start_f = start_f;
                play.end_m = end_m;
                play.end_s = end_s;
                play.end_f = end_f;
                return ioctl(fh->fd, CDIOCPLAYMSF, &play) == 0;
#else
                return false;
#endif
        } else
                return false;
}


/*
 *  Pause CD audio
 */

bool SysCDPause(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                return ioctl(fh->fd, CDROMPAUSE) == 0;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                return ioctl(fh->fd, CDIOCPAUSE) == 0;
#else
                return false;
#endif
        } else
                return false;
}


/*
 *  Resume paused CD audio
 */

bool SysCDResume(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                return ioctl(fh->fd, CDROMRESUME) == 0;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                return ioctl(fh->fd, CDIOCRESUME) == 0;
#else
                return false;
#endif
        } else
                return false;
}


/*
 *  Stop CD audio
 */

bool SysCDStop(void *arg, uint8 lead_out_m, uint8 lead_out_s, uint8 lead_out_f)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_cdrom) {
#if defined(__linux__)
                return ioctl(fh->fd, CDROMSTOP) == 0;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                return ioctl(fh->fd, CDIOCSTOP) == 0;
#else
                return false;
#endif
        } else
                return false;
}


/*
 *  Perform CD audio fast-forward/fast-reverse operation starting from specified address
 */

bool SysCDScan(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, bool reverse)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        // Not supported under Linux
        return false;
}


/*
 *  Set CD audio volume (0..255 each channel)
 */

void SysCDSetVolume(void *arg, uint8 left, uint8 right)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_volctrl vol;
                vol.channel0 = vol.channel2 = left;
                vol.channel1 = vol.channel3 = right;
                ioctl(fh->fd, CDROMVOLCTRL, &vol);
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                struct ioc_vol vol;
                vol.vol[0] = vol.vol[2] = left;
                vol.vol[1] = vol.vol[3] = right;
                ioctl(fh->fd, CDIOCSETVOL, &vol);
#endif
        }
}


/*
 *  Get CD audio volume (0..255 each channel)
 */

void SysCDGetVolume(void *arg, uint8 &left, uint8 &right)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        left = right = 0;
        if (fh->is_cdrom) {
#if defined(__linux__)
                cdrom_volctrl vol;
                ioctl(fh->fd, CDROMVOLREAD, &vol);
                left = vol.channel0;
                right = vol.channel1;
#elif defined(__FreeBSD__) || defined(__NetBSD__)
                struct ioc_vol vol;
                ioctl(fh->fd, CDIOCGETVOL, &vol);
                left = vol.vol[0];
                right = vol.vol[1];
#endif
        }
}
Revision:	1.31
Committed:	2010-02-21T09:58:00Z (14 years, 9 months ago) by cebix
Branch:	MAIN
Changes since 1.30:	+2 -1 lines
Log Message:	fixed missing INT_MAX