device.c

君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图片解码,浏览,电子书,录音,想学ucos,识货的人就下吧 russblock fmradio explore set

/*****************************************************************************
 * device.h: DVD device access
 *****************************************************************************
 * Copyright (C) 1998-2006 VideoLAN
 * $Id: device.c,v 1.3 2008/04/12 07:14:44 dsqiu Exp $
 *
 * Authors: St閜hane Borel <[e-mail]>
 *          Sam Hocevar <[e-mail]>
 *          H錵an Hjort <[e-mail]>
 *
 * 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, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include "config.h"

#include <mplaylib.h>
#include <mplaylib.h>
#include <mplaylib.h>
#ifdef HAVE_ERRNO_H
#   include <errno.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_PARAM_H
#   include <sys/param.h>
#endif
#include <fcntl.h>

#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif

#ifdef HAVE_LIMITS_H
#   include <limits.h>
#endif

#if defined( WIN32 ) && !defined( SYS_CYGWIN )
#   include <io.h>                                                 /* read() */
#else
#   include <sys/uio.h>                                      /* struct iovec */
#endif

#ifdef DARWIN_DVD_IOCTL
#   include <paths.h>
#   include <CoreFoundation/CoreFoundation.h>
#   include <IOKit/IOKitLib.h>
#   include <IOKit/IOBSD.h>
#   include <IOKit/storage/IOMedia.h>
#   include <IOKit/storage/IOCDMedia.h>
#   include <IOKit/storage/IODVDMedia.h>
#endif

#include "dvdcss/dvdcss.h"

#include "common.h"
#include "css.h"
#include "libdvdcss.h"
#include "ioctl.h"
#include "device.h"
#undef memcpy
#define memcpy uc_memcpy
/*****************************************************************************
 * Device reading prototypes
 *****************************************************************************/
static int libc_open  ( dvdcss_t, char const * );
static int libc_seek  ( dvdcss_t, int );
static int libc_read  ( dvdcss_t, void *, int );
static int libc_readv ( dvdcss_t, struct iovec *, int );

#ifdef WIN32
static int win2k_open ( dvdcss_t, char const * );
static int aspi_open  ( dvdcss_t, char const * );
static int win2k_seek ( dvdcss_t, int );
static int aspi_seek  ( dvdcss_t, int );
static int win2k_read ( dvdcss_t, void *, int );
static int aspi_read  ( dvdcss_t, void *, int );
static int win_readv  ( dvdcss_t, struct iovec *, int );

static int aspi_read_internal  ( int, void *, int );
#endif

int _dvdcss_use_ioctls( dvdcss_t dvdcss )
{
#if defined( WIN32 )
    if( dvdcss->b_file )
    {
        return 0;
    }

    /* FIXME: implement this for Windows */
    if( WIN2K )
    {
        return 1;
    }
    else
    {
        return 1;
    }
#else
    struct stat fileinfo;
    int ret;

    ret = fstat( dvdcss->i_fd, &fileinfo );
    if( ret < 0 )
    {
        return 1;  /* What to do?  Be conservative and try to use the ioctls */
    }

    /* Complete this list and check that we test for the right things
     * (I've assumed for all OSs that 'r', (raw) device, are char devices
     *  and those that don't contain/use an 'r' in the name are block devices)
     *
     * Linux    needs a block device
     * Solaris  needs a char device
     * Darwin   needs a char device
     * OpenBSD  needs a char device
     * NetBSD   needs a char device
     * FreeBSD  can use either the block or the char device
     * BSD/OS   can use either the block or the char device
     */

    /* Check if this is a block/char device */
    if( S_ISBLK( fileinfo.st_mode ) ||
        S_ISCHR( fileinfo.st_mode ) )
    {
        return 1;
    }
    else
    {
        return 0;
    }
#endif
}

void _dvdcss_check ( dvdcss_t dvdcss )
{
#if defined( WIN32 )
    DWORD drives;
    int i;
#elif defined( DARWIN_DVD_IOCTL )
    io_object_t next_media;
    mach_port_t master_port;
    kern_return_t kern_result;
    io_iterator_t media_iterator;
    CFMutableDictionaryRef classes_to_match;
#else
    char *ppsz_devices[] = { "/dev/dvd", "/dev/cdrom", "/dev/hdc", NULL };
    int i, i_fd;
#endif

    /* If the device name is non-null, return */
    if( dvdcss->psz_device[0] )
    {
        return;
    }

#if defined( WIN32 )
    drives = GetLogicalDrives();

    for( i = 0; drives; i++ )
    {
        char psz_device[5];
        DWORD cur = 1 << i;
        UINT i_ret;

        if( (drives & cur) == 0 )
        {
            continue;
        }
        drives &= ~cur;

        sprintf( psz_device, "%c:\\", 'A' + i );
        i_ret = GetDriveType( psz_device );
        if( i_ret != DRIVE_CDROM )
        {
            continue;
        }

        /* Remove trailing backslash */
        psz_device[2] = '\0';

        /* FIXME: we want to differenciate between CD and DVD drives
         * using DeviceIoControl() */
        print_debug( dvdcss, "defaulting to drive `%s'", psz_device );
        free( dvdcss->psz_device );
        dvdcss->psz_device = strdup( psz_device );
        return;
    }
#elif defined( DARWIN_DVD_IOCTL )

    kern_result = IOMasterPort( MACH_PORT_NULL, &master_port );
    if( kern_result != KERN_SUCCESS )
    {
        return;
    }

    classes_to_match = IOServiceMatching( kIODVDMediaClass );
    if( classes_to_match == NULL )
    {
        return;
    }

    CFDictionarySetValue( classes_to_match, CFSTR( kIOMediaEjectableKey ),
                          kCFBooleanTrue );

    kern_result = IOServiceGetMatchingServices( master_port, classes_to_match,
                                                &media_iterator );
    if( kern_result != KERN_SUCCESS )
    {
        return;
    }

    next_media = IOIteratorNext( media_iterator );
    for( ; ; )
    {
        char psz_buf[0x32];
        size_t i_pathlen;
        CFTypeRef psz_path;

        next_media = IOIteratorNext( media_iterator );
        if( next_media == 0 )
        {
            break;
        }

        psz_path = IORegistryEntryCreateCFProperty( next_media,
                                                    CFSTR( kIOBSDNameKey ),
                                                    kCFAllocatorDefault,
                                                    0 );
        if( psz_path == NULL )
        {
            IOObjectRelease( next_media );
            continue;
        }

        snprintf( psz_buf, sizeof(psz_buf), "%s%c", _PATH_DEV, 'r' );
        i_pathlen = strlen( psz_buf );

        if( CFStringGetCString( psz_path,
                                (char*)&psz_buf + i_pathlen,
                                sizeof(psz_buf) - i_pathlen,
                                kCFStringEncodingASCII ) )
        {
            print_debug( dvdcss, "defaulting to drive `%s'", psz_buf );
            CFRelease( psz_path );
            IOObjectRelease( next_media );
            IOObjectRelease( media_iterator );
            free( dvdcss->psz_device );
            dvdcss->psz_device = strdup( psz_buf );
            return;
        }

        CFRelease( psz_path );

        IOObjectRelease( next_media );
    }

    IOObjectRelease( media_iterator );
#else
    for( i = 0; ppsz_devices[i]; i++ )
    {
        i_fd = open( ppsz_devices[i], 0 );
        if( i_fd != -1 )
        {
            print_debug( dvdcss, "defaulting to drive `%s'", ppsz_devices[i] );
            close( i_fd );
            free( dvdcss->psz_device );
            dvdcss->psz_device = strdup( ppsz_devices[i] );
            return;
        }
    }
#endif

    print_error( dvdcss, "could not find a suitable default drive" );
}

int _dvdcss_open ( dvdcss_t dvdcss )
{
    char const *psz_device = dvdcss->psz_device;

    print_debug( dvdcss, "opening target `%s'", psz_device );

#if defined( WIN32 )
    dvdcss->b_file = 1;
    /* If device is "X:" or "X:\", we are not actually opening a file. */
    if (psz_device[0] && psz_device[1] == ':' &&
       (!psz_device[2] || (psz_device[2] == '\\' && !psz_device[3])))
        dvdcss->b_file = 0;

    /* Initialize readv temporary buffer */
    dvdcss->p_readv_buffer   = NULL;
    dvdcss->i_readv_buf_size = 0;

    if( !dvdcss->b_file && WIN2K )
    {
        print_debug( dvdcss, "using Win2K API for access" );
        dvdcss->pf_seek  = win2k_seek;
        dvdcss->pf_read  = win2k_read;
        dvdcss->pf_readv = win_readv;
        return win2k_open( dvdcss, psz_device );
    }
    else if( !dvdcss->b_file )
    {
        print_debug( dvdcss, "using ASPI for access" );
        dvdcss->pf_seek  = aspi_seek;
        dvdcss->pf_read  = aspi_read;
        dvdcss->pf_readv = win_readv;
        return aspi_open( dvdcss, psz_device );
    }
    else
#endif
    {
        print_debug( dvdcss, "using libc for access" );
        dvdcss->pf_seek  = libc_seek;
        dvdcss->pf_read  = libc_read;
        dvdcss->pf_readv = libc_readv;
        return libc_open( dvdcss, psz_device );
    }
}

#ifndef WIN32
int _dvdcss_raw_open ( dvdcss_t dvdcss, char const *psz_device )
{
    dvdcss->i_raw_fd = open( psz_device, 0 );

    if( dvdcss->i_raw_fd == -1 )
    {
        print_debug( dvdcss, "cannot open %s (%s)",
                             psz_device, strerror(errno) );
        print_error( dvdcss, "failed to open raw device, but continuing" );
        return -1;
    }
    else
    {
        dvdcss->i_read_fd = dvdcss->i_raw_fd;
    }

    return 0;
}
#endif

int _dvdcss_close ( dvdcss_t dvdcss )
{
#if defined( WIN32 )
    if( dvdcss->b_file )
    {
        close( dvdcss->i_fd );
    }
    else if( WIN2K )
    {
        CloseHandle( (HANDLE) dvdcss->i_fd );
    }
    else /* ASPI */
    {
        struct w32_aspidev *fd = (struct w32_aspidev *) dvdcss->i_fd;

        /* Unload aspi and free w32_aspidev structure */
        FreeLibrary( (HMODULE) fd->hASPI );
        free( (void*) dvdcss->i_fd );
    }

    /* Free readv temporary buffer */
    if( dvdcss->p_readv_buffer )
    {
        free( dvdcss->p_readv_buffer );
        dvdcss->p_readv_buffer   = NULL;
        dvdcss->i_readv_buf_size = 0;
    }

    return 0;
#else
    close( dvdcss->i_fd );

    if( dvdcss->i_raw_fd >= 0 )
    {
        close( dvdcss->i_raw_fd );
        dvdcss->i_raw_fd = -1;
    }

    return 0;
#endif
}

/* Following functions are local */

/*****************************************************************************
 * Open commands.
 *****************************************************************************/
static int libc_open ( dvdcss_t dvdcss, char const *psz_device )
{
#if !defined( WIN32 )
    dvdcss->i_fd = dvdcss->i_read_fd = open( psz_device, 0 );
#else
    dvdcss->i_fd = dvdcss->i_read_fd = open( psz_device, O_BINARY );
#endif

    if( dvdcss->i_fd == -1 )
    {
        print_debug( dvdcss, "cannot open %s (%s)",
                             psz_device, strerror(errno) );
        print_error( dvdcss, "failed to open device" );
        return -1;
    }

    dvdcss->i_pos = 0;

    return 0;
}

#if defined( WIN32 )
static int win2k_open ( dvdcss_t dvdcss, char const *psz_device )
{
    char psz_dvd[7];
    _snprintf( psz_dvd, 7, "\\\\.\\%c:", psz_device[0] );

    /* To work around an M$ bug in IOCTL_DVD_READ_STRUCTURE, we need read
     * _and_ write access to the device (so we can make SCSI Pass Through
     * Requests). Unfortunately this is only allowed if you have
     * administrator priviledges so we allow for a fallback method with
     * only read access to the device (in this case ioctl_ReadCopyright()
     * won't send back the right result).
     * (See Microsoft Q241374: Read and Write Access Required for SCSI
     * Pass Through Requests) */
    dvdcss->i_fd = (int)
                CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE,
                            FILE_SHARE_READ | FILE_SHARE_WRITE,
                            NULL, OPEN_EXISTING,
                            FILE_FLAG_RANDOM_ACCESS, NULL );

    if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
        dvdcss->i_fd = (int)
                    CreateFile( psz_dvd, GENERIC_READ, FILE_SHARE_READ,
                                NULL, OPEN_EXISTING,
                                FILE_FLAG_RANDOM_ACCESS, NULL );

    if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
    {
        print_error( dvdcss, "failed opening device" );
        return -1;
    }

    dvdcss->i_pos = 0;

    return 0;
}

static int aspi_open( dvdcss_t dvdcss, char const * psz_device )
{
    HMODULE hASPI;
    DWORD dwSupportInfo;
    struct w32_aspidev *fd;
    int i, j, i_hostadapters;
    GETASPI32SUPPORTINFO lpGetSupport;
    SENDASPI32COMMAND lpSendCommand;
    char c_drive = psz_device[0];

    /* load aspi and init w32_aspidev structure */
    hASPI = LoadLibrary( "wnaspi32.dll" );
    if( hASPI == NULL )
    {
        print_error( dvdcss, "unable to load wnaspi32.dll" );
        return -1;
    }

    lpGetSupport = (GETASPI32SUPPORTINFO) GetProcAddress( hASPI, "GetASPI32SupportInfo" );
    lpSendCommand = (SENDASPI32COMMAND) GetProcAddress( hASPI, "SendASPI32Command" );

    if(lpGetSupport == NULL || lpSendCommand == NULL )
    {
        print_error( dvdcss, "unable to get aspi function pointers" );
        FreeLibrary( hASPI );
        return -1;
    }