src/Windows/sys_windows.cpp

/*
 *  sys_windows.cpp - System dependent routines, Windows implementation
 *
 *  Basilisk II (C) 1997-2008 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"

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winioctl.h>

#include <string>
using std::string;

#include <algorithm>
using std::min;

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

#include "cd_defs.h"
#include "cdenable/ntcd.h"
#include "cdenable/cache.h"
#include "cdenable/eject_nt.h"

#define DEBUG 0
#include "debug.h"


// File handles are pointers to these structures
struct file_handle {
        char *name;                     // Copy of device/file name
        HANDLE fh;
        bool is_file;           // Flag: plain file or physical device?
        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)
        cachetype cache;
        bool is_media_present;
};

// 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;

// CD-ROM variables
static const int CD_READ_AHEAD_SECTORS = 16;
static char *sector_buffer = NULL;

// Prototypes
static bool is_cdrom_readable(file_handle *fh);


/*
 *  Initialization
 */

void SysInit(void)
{
        // Initialize CD-ROM driver
        sector_buffer = (char *)VirtualAlloc(NULL, 8192, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
        CdenableSysInstallStart();
}


/*
 *  Deinitialization
 */

void SysExit(void)
{
        if (sector_buffer) {
                VirtualFree(sector_buffer, 0, MEM_RELEASE );
                sector_buffer = NULL;
        }
}


/*
 *  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;
        }
}


/*
 *  Mount removable media now
 */

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

                if (fh->is_cdrom && (media & MEDIA_CD)) {
                        cache_clear(&fh->cache);
                        fh->start_byte = 0;

                        if (fh->fh && fh->fh != INVALID_HANDLE_VALUE)
                                CloseHandle(fh->fh);

                        // Re-open device
                        char device_name[MAX_PATH];
                        sprintf(device_name, "\\\\.\\%c:", fh->name[0]);
                        fh->fh = CreateFile(
                                device_name,
                                GENERIC_READ,
                                FILE_SHARE_READ | FILE_SHARE_WRITE,
                                NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

                        if (fh->fh != INVALID_HANDLE_VALUE) {
                                fh->is_media_present = is_cdrom_readable(fh);
                                if (fh->is_media_present)
                                        MountVolume(fh);
                        } else {
                                fh->is_media_present = false;
                        }
                }
        }
}


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

void SysMediaArrived(void)
{
        mount_removable_media(MEDIA_REMOVABLE);
}


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

void SysMediaRemoved(void)
{
}


/*
 *  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)
{
}


/*
 *  This gets called when no "disk" prefs items are found
 *  It scans for available HFS volumes and adds appropriate prefs items
 */

void SysAddDiskPrefs(void)
{
}


/*
 *  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;

        for (char letter = 'C'; letter <= 'Z'; letter++) {
                int i = (int)(letter - 'A');
                string rootdir = letter + ":\\";
                if (GetDriveType(rootdir.c_str()) == DRIVE_CDROM)
                        PrefsAddString("cdrom", rootdir.c_str());
        }
}


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

void SysAddSerialPrefs(void)
{
        PrefsAddString("seriala", "COM1");
        PrefsAddString("serialb", "COM2");
}


/*
 *  Read CD-ROM
 *  Must give cd some time to settle
 *  Can't give too much however, would be annoying, this is difficult..
 */

static inline int cd_read_with_retry(file_handle *fh, ULONG LBA, int count, char *buf )
{
        if (!fh || !fh->fh)
                return 0;

        return CdenableSysReadCdBytes(fh->fh, LBA, count, buf);
}

static int cd_read(file_handle *fh, cachetype *cptr, ULONG LBA, int count, char *buf)
{
        ULONG l1, l2, cc;
        int i, c_count, got_bytes = 0, nblocks, s_inx, ss, first_block;
        int ok_bytes = 0;
        char *ptr, *ttptr = 0, *tmpbuf;

        if (count <= 0)
                return 0;

        if (!fh || !fh->fh)
                return 0;

        ss = 2048;
        l1 = (LBA / ss) * ss;
        l2 = ((LBA + count - 1 + ss) / ss) * ss;
        cc = l2 - l1;
        nblocks = cc / ss;
        first_block = LBA / ss;

        ptr = buf;
        s_inx = LBA - l1;
        c_count = ss - s_inx;
        if (c_count > count)
                c_count = count;

        for (i = 0; i < nblocks; i++) {
                if (!cache_get(cptr, first_block + i, sector_buffer))
                        break;

                memcpy(ptr, sector_buffer + s_inx, c_count);
                ok_bytes += c_count;
                ptr += c_count;
                s_inx = 0;
                c_count = ss;
                if (c_count > count - ok_bytes)
                        c_count = count - ok_bytes;
        }

        if (i != nblocks && count != ok_bytes) {
                int bytes_left = count - ok_bytes;
                int blocks_left = nblocks - i;
                int alignedleft;

                // NEW read ahead code:
                int ahead = CD_READ_AHEAD_SECTORS;
                if (blocks_left < ahead) {
                        nblocks += (ahead - blocks_left);
                        blocks_left = ahead;
                }

                alignedleft = blocks_left*ss;

                tmpbuf = (char *)VirtualAlloc(
                        NULL, alignedleft,
                        MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
                if (tmpbuf) {
                        got_bytes = cd_read_with_retry(fh, (first_block + i) * ss, alignedleft, tmpbuf);
                        if (got_bytes != alignedleft) {
                                // should never happen
                                // Yes it does ...
                                if (got_bytes < 0)
                                        got_bytes = 0;
                                if (c_count > got_bytes)
                                        c_count = got_bytes;
                                if (c_count > 0) {
                                        ttptr = tmpbuf;
                                        memcpy(ptr, ttptr + s_inx, c_count);
                                        ok_bytes += c_count;
                                }
                                VirtualFree(tmpbuf, 0, MEM_RELEASE );
                                return ok_bytes;
                        }
                        ttptr = tmpbuf;
                        for ( ; i < nblocks; i++) {
                                if (c_count > 0) {
                                        memcpy(ptr, ttptr + s_inx, c_count);
                                        ok_bytes += c_count;
                                        ptr += c_count;
                                }
                                s_inx = 0;
                                c_count = ss;
                                if (c_count > count - ok_bytes)
                                        c_count = count - ok_bytes;
                                cache_put(cptr, first_block + i, ttptr, ss);
                                ttptr += ss;
                        }
                        VirtualFree(tmpbuf, 0, MEM_RELEASE );
                }
        }

        return ok_bytes;
}


/*
 *  Check if file handle FH represents a readable CD-ROM
 */

static bool is_cdrom_readable(file_handle *fh)
{
        if (!fh || !fh->fh)
                return false;

        cache_clear(&fh->cache);

        DWORD dummy;
        bool result = (0 != DeviceIoControl(
                fh->fh,
                IOCTL_STORAGE_CHECK_VERIFY,
                NULL, 0,
                NULL, 0,
                &dummy,
                NULL));
        if (!result) {
                const size_t n_bytes = 2048;
                char *buffer = (char *)VirtualAlloc(NULL, n_bytes, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
                if (buffer) {
                        result = (cd_read_with_retry(fh, 0, n_bytes, buffer) == n_bytes);
                        VirtualFree(buffer, 0, MEM_RELEASE);
                }
        }

        return result;
}


/*
 *  Check if NAME represents a read-only file
 */

static bool is_read_only_path(const char *name)
{
        DWORD attrib = GetFileAttributes((char *)name);
        return (attrib != INVALID_FILE_ATTRIBUTES && ((attrib & FILE_ATTRIBUTE_READONLY) != 0));
}


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

void *Sys_open(const char *path_name, bool read_only)
{
        file_handle * fh = NULL;

        // Parse path name and options
        char name[MAX_PATH];
        strcpy(name, path_name);

        // Normalize floppy / cd path
        int name_len = strlen(name);
        if (name_len == 1 && isalpha(name[0]))
                strcat(name, ":\\");
        if (name_len > 0 && name[name_len - 1] == ':')
                strcat(name, "\\");
        name_len = strlen(name);

        D(bug("Sys_open(%s, %s)\n", name, read_only ? "read-only" : "read/write"));
        if (name_len > 0 && name[name_len - 1] == '\\') {
                int type = GetDriveType(name);

                if (type == DRIVE_CDROM) {
                        read_only = true;
                        char device_name[MAX_PATH];
                        sprintf(device_name, "\\\\.\\%c:", name[0]);

                        // Open device
                        HANDLE h = CreateFile(
                                device_name,
                                GENERIC_READ,
                                0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

                        if (h != INVALID_HANDLE_VALUE) {
                                fh = new file_handle;
                                fh->name = strdup(name);
                                fh->fh = h;
                                fh->is_file = false;
                                fh->read_only = read_only;
                                fh->start_byte = 0;
                                fh->is_floppy = false;
                                fh->is_cdrom = true;
                                memset(&fh->cache, 0, sizeof(cachetype));
                                cache_init(&fh->cache);
                                cache_clear(&fh->cache);
                                if (!PrefsFindBool("nocdrom"))
                                        fh->is_media_present = is_cdrom_readable(fh);
                        }
                }
        }

        else { // Hard file

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

                // Open file
                HANDLE h = CreateFile(
                        name,
                        read_only ? GENERIC_READ : GENERIC_READ | GENERIC_WRITE,
                        0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

                if (h == INVALID_HANDLE_VALUE && !read_only) {
                        // Read-write failed, try read-only
                        read_only = true;
                        h = CreateFile(
                                name,
                                GENERIC_READ,
                                0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
                }

                if (h != INVALID_HANDLE_VALUE) {
                        fh = new file_handle;
                        fh->name = strdup(name);
                        fh->fh = h;
                        fh->is_file = true;
                        fh->read_only = read_only;
                        fh->start_byte = 0;
                        fh->is_floppy = false;
                        fh->is_cdrom = false;

                        // Detect disk image file layout
                        loff_t size = GetFileSize(h, NULL);
                        DWORD bytes_read;
                        uint8 data[256];
                        ReadFile(h, data, sizeof(data), &bytes_read, NULL);
                        FileDiskLayout(size, data, fh->start_byte, fh->file_size);
                }
        }

        if (fh->is_floppy && first_floppy == NULL)
                first_floppy = fh;

        if (fh)
                sys_add_file_handle(fh);

        return fh;
}


/*
 *  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) {
                cache_final(&fh->cache);
                SysAllowRemoval((void *)fh);
        }
        if (fh->fh != NULL) {
                CloseHandle(fh->fh);
                fh->fh = NULL;
        }
        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;

        DWORD bytes_read = 0;

        if (fh->is_file) {
                // Seek to position
                LONG lo = (LONG)offset;
                LONG hi = (LONG)(offset >> 32);
                DWORD r = SetFilePointer(fh->fh, lo, &hi, FILE_BEGIN);
                if (r == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR)
                        return 0;

                // Read data
                if (ReadFile(fh->fh, buffer, length, &bytes_read, NULL) == 0)
                        bytes_read = 0;
        }
        else if (fh->is_cdrom) {
                int bytes_left, try_bytes, got_bytes;
                char *b = (char *)buffer;
                bytes_left = length;
                while (bytes_left) {
                        try_bytes = min(bytes_left, 32768);
                        if (fh->is_cdrom) {
                                got_bytes = cd_read(fh, &fh->cache, (DWORD)offset, try_bytes, b);
                                if (got_bytes != try_bytes && !PrefsFindBool("nocdrom"))
                                        fh->is_media_present = is_cdrom_readable(fh);
                        }
                        b += got_bytes;
                        offset += got_bytes;
                        bytes_read += got_bytes;
                        bytes_left -= got_bytes;
                        if (got_bytes != try_bytes)
                                bytes_left = 0;
                }
        }
        // TODO: other media

        return bytes_read;
}


/*
 *  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;

        DWORD bytes_written = 0;

        if (fh->is_file) {
                // Seek to position
                LONG lo = (LONG)offset;
                LONG hi = (LONG)(offset >> 32);
                DWORD r = SetFilePointer(fh->fh, lo, &hi, FILE_BEGIN);
                if (r == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR)
                        return 0;

                // Write data
                if (WriteFile(fh->fh, buffer, length, &bytes_written, NULL) == 0)
                        bytes_written = 0;
        }
        // TODO: other media

        return bytes_written;
}


/*
 *  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 (fh->is_cdrom)
                return 0x28A00000; // FIXME: get real CD-ROM size
        else {
                // TODO: other media
                return 0;
        }
}


/*
 *  Eject volume (if applicable)
 */

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

        if (fh->is_cdrom && fh->fh) {
                fh->is_media_present = false;
                // Commented out because there was some problems, but can't remember
                // exactly ... need to find out
                // EjectVolume(toupper(*fh->name),false);

                // Preventing is cumulative, try to make sure it's indeed released now
                for (int i = 0; i < 10; i++)
                        PreventRemovalOfVolume(fh->fh, false);

                if (!PrefsFindBool("nocdrom")) {
                        DWORD dummy;
                        DeviceIoControl(
                                fh->fh,
                                IOCTL_STORAGE_EJECT_MEDIA,
                                NULL, 0,
                                NULL, 0,
                                &dummy,
                                NULL
                                );
                }
                cache_clear(&fh->cache);
                fh->start_byte = 0;
        }
        // TODO: handle floppies
}


/*
 *  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;

        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;
        else if (fh->is_cdrom && !PrefsFindBool("nocdrom")) {
                if (PrefsFindBool("pollmedia"))
                        fh->is_media_present = is_cdrom_readable(fh);
                return fh->is_media_present;
        }
        else {
                // TODO: other media
        }

        return false;
}


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

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

        if (fh->is_cdrom && fh->fh)
                PreventRemovalOfVolume(fh->fh, true);
}


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

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

        if (fh->is_cdrom && fh->fh)
                PreventRemovalOfVolume(fh->fh, false);
}


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

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

        DWORD dummy;
        return DeviceIoControl(fh->fh,
                                                   IOCTL_CDROM_READ_TOC,
                                                   NULL, 0,
                                                   toc, min((int)sizeof(CDROM_TOC), 804),
                                                   &dummy,
                                                   NULL);
}


/*
 *  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 || !fh->fh || !fh->is_cdrom)
                return false;

        SUB_Q_CHANNEL_DATA q_data;

        CDROM_SUB_Q_DATA_FORMAT q_format;
        q_format.Format = IOCTL_CDROM_CURRENT_POSITION;
        q_format.Track = 0; // used only by ISRC reads

        DWORD dwBytesReturned = 0;
        bool ok = DeviceIoControl(fh->fh,
                                                          IOCTL_CDROM_READ_Q_CHANNEL,
                                                          &q_format, sizeof(CDROM_SUB_Q_DATA_FORMAT),
                                                          &q_data, sizeof(SUB_Q_CHANNEL_DATA),
                                                          &dwBytesReturned,
                                                          NULL);
        if (ok)
                memcpy(pos, &q_data.CurrentPosition, sizeof(SUB_Q_CURRENT_POSITION));

        return ok;
}


/*
 *  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 || !fh->fh || !fh->is_cdrom)
                return false;

        CDROM_PLAY_AUDIO_MSF msf;
        msf.StartingM = start_m;
        msf.StartingS = start_s;
        msf.StartingF = start_f;
        msf.EndingM = end_m;
        msf.EndingS = end_s;
        msf.EndingF = end_f;

        DWORD dwBytesReturned = 0;
        return DeviceIoControl(fh->fh,
                                                   IOCTL_CDROM_PLAY_AUDIO_MSF,
                                                   &msf, sizeof(CDROM_PLAY_AUDIO_MSF),
                                                   NULL, 0,
                                                   &dwBytesReturned,
                                                   NULL);
}


/*
 *  Pause CD audio
 */

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

        DWORD dwBytesReturned = 0;
        return DeviceIoControl(fh->fh,
                                                   IOCTL_CDROM_PAUSE_AUDIO,
                                                   NULL, 0,
                                                   NULL, 0,
                                                   &dwBytesReturned,
                                                   NULL);
}


/*
 *  Resume paused CD audio
 */

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

        DWORD dwBytesReturned = 0;
        return DeviceIoControl(fh->fh,
                                                   IOCTL_CDROM_RESUME_AUDIO,
                                                   NULL, 0,
                                                   NULL, 0,
                                                   &dwBytesReturned, NULL);
}


/*
 *  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 || !fh->fh || !fh->is_cdrom)
                return false;

        DWORD dwBytesReturned = 0;
        return DeviceIoControl(fh->fh,
                                                   IOCTL_CDROM_STOP_AUDIO,
                                                   NULL, 0,
                                                   NULL, 0,
                                                   &dwBytesReturned,
                                                   NULL);
}


/*
 *  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 || !fh->fh || !fh->is_cdrom)
                return false;

        CDROM_SEEK_AUDIO_MSF msf;
        msf.M = start_m;
        msf.S = start_s;
        msf.F = start_f;

        DWORD dwBytesReturned = 0;
        return DeviceIoControl(fh->fh,
                                                   IOCTL_CDROM_SEEK_AUDIO_MSF,
                                                   &msf, sizeof(CDROM_SEEK_AUDIO_MSF),
                                                   NULL, 0,
                                                   &dwBytesReturned,
                                                   NULL);
}


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

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

        VOLUME_CONTROL vc;
        vc.PortVolume[0] = left;
        vc.PortVolume[1] = right;
        vc.PortVolume[2] = left;
        vc.PortVolume[3] = right;

        DWORD dwBytesReturned = 0;
        DeviceIoControl(fh->fh,
                                        IOCTL_CDROM_SET_VOLUME,
                                        &vc, sizeof(VOLUME_CONTROL),
                                        NULL, 0,
                                        &dwBytesReturned,
                                        NULL);
}


/*
 *  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->fh || !fh->is_cdrom)
                return;

        VOLUME_CONTROL vc;
        memset(&vc, 0, sizeof(vc));

        DWORD dwBytesReturned = 0;
        if (DeviceIoControl(fh->fh,
                                                IOCTL_CDROM_GET_VOLUME,
                                                NULL, 0,
                                                &vc, sizeof(VOLUME_CONTROL),
                                                &dwBytesReturned,
                                                NULL))
        {
                left = vc.PortVolume[0];
                right = vc.PortVolume[1];
        }
}
Revision:	1.5
Committed:	2008-01-01T09:40:34Z (16 years, 5 months ago) by gbeauche
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.4:	+1 -1 lines
Log Message:	Happy New Year!