ref: 18b755d525681ce85e14b5b953687938d1812f1a
dir: /src/device.c/
/*****************************************************************************
* device.h: DVD device access
*****************************************************************************
* Copyright (C) 1998-2006 VideoLAN
*
* Authors: Stéphane Borel <stef@via.ecp.fr>
* Sam Hocevar <sam@zoy.org>
* Håkan Hjort <d95hjort@dtek.chalmers.se>
*
* libdvdcss 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.
*
* libdvdcss 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 libdvdcss; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include "config.h"
#ifdef __PLAN9__
# include <u.h>
# include <libc.h>
#else
# include <limits.h>
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
#endif
#ifdef HAVE_ERRNO_H
# include <errno.h>
#endif
#ifndef __PLAN9__
# include <sys/types.h>
# include <sys/stat.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifndef __PLAN9__
# include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#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
#ifdef __OS2__
# define INCL_DOS
# define INCL_DOSDEVIOCTL
# include <os2.h>
# include <io.h> /* setmode() */
# include <fcntl.h> /* O_BINARY */
#endif
#ifdef _WIN32
# include <windows.h>
#endif
#include "dvdcss/dvdcss.h"
#include "common.h"
#include "css.h"
#include "libdvdcss.h"
#include "ioctl.h"
#include "device.h"
/*****************************************************************************
* Device reading prototypes
*****************************************************************************/
static int libc_open ( dvdcss_t, const char * );
static int libc_seek ( dvdcss_t, int );
static int libc_read ( dvdcss_t, void *, int );
static int libc_readv ( dvdcss_t, const struct iovec *, int );
static int stream_seek ( dvdcss_t, int );
static int stream_read ( dvdcss_t, void *, int );
static int stream_readv ( dvdcss_t, const struct iovec *, int );
#ifdef _WIN32
static int win2k_open ( dvdcss_t, const char * );
static int win2k_seek ( dvdcss_t, int );
static int win2k_read ( dvdcss_t, void *, int );
static int win2k_readv ( dvdcss_t, const struct iovec *, int );
#elif defined( __OS2__ )
static int os2_open ( dvdcss_t, const char * );
#endif
int dvdcss_use_ioctls( dvdcss_t dvdcss )
{
if( dvdcss->p_stream )
return 0;
#if defined( _WIN32 )
if( dvdcss->b_file )
{
return 0;
}
/* FIXME: implement this for Windows */
return 1;
#elif defined( __OS2__ )
ULONG ulMode;
if( DosQueryFHState( dvdcss->i_fd, &ulMode ) != 0 )
return 1; /* What to do? Be conservative and try to use the ioctls */
if( ulMode & OPEN_FLAGS_DASD )
return 1;
return 0;
#elif defined( __PLAN9__ )
return 0;
#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
*/
/* 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_device ( 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;
#elif defined( __OS2__ )
#pragma pack( 1 )
struct
{
BYTE bCmdInfo;
BYTE bDrive;
} param;
struct
{
BYTE abEBPB[31];
USHORT usCylinders;
BYTE bDevType;
USHORT usDevAttr;
} data;
#pragma pack()
ULONG ulParamLen;
ULONG ulDataLen;
ULONG rc;
int i;
#else
const char *ppsz_devices[] = { "/dev/dvd", "/dev/cdrom", "/dev/hdc", NULL };
int i, i_fd;
#endif
/* If the device name is non-NULL or stream is set, return. */
if( (dvdcss->psz_device && dvdcss->psz_device[0]) || dvdcss->p_stream )
{
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 differentiate 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 );
#elif defined( __OS2__ )
for( i = 0; i < 26; i++ )
{
param.bCmdInfo = 0;
param.bDrive = i;
rc = DosDevIOCtl( ( HFILE )-1, IOCTL_DISK, DSK_GETDEVICEPARAMS,
¶m, sizeof( param ), &ulParamLen,
&data, sizeof( data ), &ulDataLen );
if( rc == 0 )
{
/* Check for removable and for cylinders */
if( ( data.usDevAttr & 1 ) == 0 && data.usCylinders == 0xFFFF )
{
char psz_dvd[] = "A:";
psz_dvd[0] += i;
print_debug( dvdcss, "defaulting to drive `%s'", psz_dvd );
free( dvdcss->psz_device );
dvdcss->psz_device = strdup( psz_dvd );
return;
}
}
}
#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_device ( dvdcss_t dvdcss )
{
const char *psz_device = getenv( "DVDCSS_RAW_DEVICE" );
if( !psz_device )
{
psz_device = dvdcss->psz_device;
}
print_debug( dvdcss, "opening target `%s'", psz_device );
#if defined( _WIN32 )
/* Initialize readv temporary buffer */
dvdcss->p_readv_buffer = NULL;
dvdcss->i_readv_buf_size = 0;
#endif
/* if callback functions are initialized */
if( dvdcss->p_stream )
{
print_debug( dvdcss, "using stream API for access" );
dvdcss->pf_seek = stream_seek;
dvdcss->pf_read = stream_read;
dvdcss->pf_readv = stream_readv;
return 0;
}
#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;
if( !dvdcss->b_file )
{
print_debug( dvdcss, "using Win2K API for access" );
dvdcss->pf_seek = win2k_seek;
dvdcss->pf_read = win2k_read;
dvdcss->pf_readv = win2k_readv;
return win2k_open( dvdcss, psz_device );
}
else
#elif defined( __OS2__ )
/* 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] ) ) )
{
print_debug( dvdcss, "using OS/2 API for access" );
dvdcss->pf_seek = libc_seek;
dvdcss->pf_read = libc_read;
dvdcss->pf_readv = libc_readv;
return os2_open( dvdcss, psz_device );
}
else
#endif
{
print_debug( dvdcss, "using libc API for access" );
dvdcss->pf_seek = libc_seek;
dvdcss->pf_read = libc_read;
dvdcss->pf_readv = libc_readv;
return libc_open( dvdcss, psz_device );
}
}
int dvdcss_close_device ( dvdcss_t dvdcss )
{
if( dvdcss->p_stream )
{
return 0;
}
#if defined( _WIN32 )
/* Free readv temporary buffer */
free( dvdcss->p_readv_buffer );
dvdcss->p_readv_buffer = NULL;
dvdcss->i_readv_buf_size = 0;
if( !dvdcss->b_file )
{
CloseHandle( (HANDLE) dvdcss->i_fd );
}
else
#endif
{
int i_ret = close( dvdcss->i_fd );
if( i_ret < 0 )
{
print_error( dvdcss, "Failed to close fd, data loss possible." );
return i_ret;
}
}
return 0;
}
/* Following functions are local */
/*****************************************************************************
* Open commands.
*****************************************************************************/
static int libc_open ( dvdcss_t dvdcss, const char *psz_device )
{
#ifdef _WIN32
int wlen;
dvdcss->i_fd = -1;
wlen = MultiByteToWideChar( CP_UTF8, 0, psz_device, -1, NULL, 0 );
if( wlen > 0 ) {
wchar_t *wpath = (wchar_t*)malloc( sizeof(wchar_t) * wlen );
if( wpath ) {
if( MultiByteToWideChar(CP_UTF8, 0, psz_device, -1, wpath, wlen ) ) {
dvdcss->i_fd = _wopen( wpath, O_BINARY );
}
free( wpath );
}
}
#else
dvdcss->i_fd = open( psz_device, O_BINARY );
#endif
if( dvdcss->i_fd == -1 )
{
print_error( dvdcss, "failed to open device %s (%s)",
psz_device, strerror(errno) );
return -1;
}
return 0;
}
#if defined( _WIN32 )
static int win2k_open ( dvdcss_t dvdcss, const char *psz_device )
{
char psz_dvd[7] = "\\\\.\\\0:";
psz_dvd[4] = 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 privileges 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 to open device %s", psz_device );
return -1;
}
dvdcss->i_pos = 0;
return 0;
}
#endif /* defined( _WIN32 ) */
#ifdef __OS2__
static int os2_open ( dvdcss_t dvdcss, const char *psz_device )
{
char psz_dvd[] = "X:";
HFILE hfile;
ULONG ulAction;
ULONG rc;
psz_dvd[0] = psz_device[0];
rc = DosOpenL( ( PSZ )psz_dvd, &hfile, &ulAction, 0, FILE_NORMAL,
OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW,
OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE | OPEN_FLAGS_DASD,
NULL );
if( rc )
{
print_error( dvdcss, "failed to open device %s", psz_device );
return -1;
}
setmode( hfile, O_BINARY );
dvdcss->i_fd = hfile;
dvdcss->i_pos = 0;
return 0;
}
#endif /* __OS2__ */
/*****************************************************************************
* Seek commands.
*****************************************************************************/
static int libc_seek( dvdcss_t dvdcss, int i_blocks )
{
off_t i_seek;
if( dvdcss->i_pos == i_blocks )
{
/* We are already in position */
return i_blocks;
}
i_seek = (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE;
i_seek = lseek( dvdcss->i_fd, i_seek, SEEK_SET );
if( i_seek < 0 )
{
print_error( dvdcss, "seek error" );
dvdcss->i_pos = -1;
return i_seek;
}
dvdcss->i_pos = i_seek / DVDCSS_BLOCK_SIZE;
return dvdcss->i_pos;
}
static int stream_seek( dvdcss_t dvdcss, int i_blocks )
{
off_t i_seek = (off_t) i_blocks * (off_t) DVDCSS_BLOCK_SIZE;
if( !dvdcss->p_stream_cb->pf_seek )
return -1;
if( dvdcss->i_pos == i_blocks )
{
/* We are already in position */
return i_blocks;
}
if( dvdcss->p_stream_cb->pf_seek( dvdcss->p_stream, i_seek ) != 0 )
{
print_error( dvdcss, "seek error" );
dvdcss->i_pos = -1;
return -1;
}
dvdcss->i_pos = i_blocks;
return dvdcss->i_pos;
}
#if defined( _WIN32 )
static int win2k_seek( dvdcss_t dvdcss, int i_blocks )
{
LARGE_INTEGER li_seek;
if( dvdcss->i_pos == i_blocks )
{
/* We are already in position */
return i_blocks;
}
li_seek.QuadPart = (LONGLONG)i_blocks * DVDCSS_BLOCK_SIZE;
li_seek.LowPart = SetFilePointer( (HANDLE) dvdcss->i_fd,
li_seek.LowPart,
&li_seek.HighPart, FILE_BEGIN );
if( (li_seek.LowPart == INVALID_SET_FILE_POINTER)
&& GetLastError() != NO_ERROR)
{
dvdcss->i_pos = -1;
return -1;
}
dvdcss->i_pos = li_seek.QuadPart / DVDCSS_BLOCK_SIZE;
return dvdcss->i_pos;
}
#endif /* defined( _WIN32 ) */
/*****************************************************************************
* Read commands.
*****************************************************************************/
static int libc_read ( dvdcss_t dvdcss, void *p_buffer, int i_blocks )
{
off_t i_size, i_ret, i_ret_blocks;
i_size = (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE;
i_ret = read( dvdcss->i_fd, p_buffer, i_size );
if( i_ret < 0 )
{
print_error( dvdcss, "read error" );
dvdcss->i_pos = -1;
return i_ret;
}
i_ret_blocks = i_ret / DVDCSS_BLOCK_SIZE;
/* Handle partial reads */
if( i_ret != i_size )
{
int i_seek, i_set_pos;
i_set_pos = dvdcss->i_pos + i_ret_blocks;
dvdcss->i_pos = -1;
i_seek = libc_seek( dvdcss, i_set_pos );
if( i_seek < 0 )
{
return i_seek;
}
/* We have to return now so that i_pos isn't clobbered */
return i_ret_blocks;
}
dvdcss->i_pos += i_ret_blocks;
return i_ret_blocks;
}
static int stream_read ( dvdcss_t dvdcss, void *p_buffer, int i_blocks )
{
off_t i_size, i_ret, i_ret_blocks;
i_size = (off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE;
if( !dvdcss->p_stream_cb->pf_read )
return -1;
i_ret = dvdcss->p_stream_cb->pf_read( dvdcss->p_stream, p_buffer, i_size );
if( i_ret < 0 )
{
print_error( dvdcss, "read error" );
dvdcss->i_pos = -1;
return i_ret;
}
i_ret_blocks = i_ret / DVDCSS_BLOCK_SIZE;
/* Handle partial reads */
if( i_ret != i_size )
{
int i_seek;
dvdcss->i_pos = -1;
i_seek = stream_seek( dvdcss, i_ret_blocks );
if( i_seek < 0 )
{
return i_seek;
}
/* We have to return now so that i_pos isn't clobbered */
return i_ret_blocks;
}
dvdcss->i_pos += i_ret_blocks;
return i_ret_blocks;
}
#if defined( _WIN32 )
static int win2k_read ( dvdcss_t dvdcss, void *p_buffer, int i_blocks )
{
DWORD i_bytes;
if( !ReadFile( (HANDLE) dvdcss->i_fd, p_buffer,
i_blocks * DVDCSS_BLOCK_SIZE,
&i_bytes, NULL ) )
{
dvdcss->i_pos = -1;
return -1;
}
i_bytes /= DVDCSS_BLOCK_SIZE;
dvdcss->i_pos += i_bytes;
return i_bytes;
}
#endif /* defined( _WIN32 ) */
/*****************************************************************************
* Readv commands.
*****************************************************************************/
static int libc_readv ( dvdcss_t dvdcss, const struct iovec *p_iovec,
int i_blocks )
{
#if defined( _WIN32 )
int i_index, i_len, i_total = 0;
unsigned char *p_base;
int i_bytes;
for( i_index = i_blocks;
i_index;
i_index--, p_iovec++ )
{
i_len = p_iovec->iov_len;
p_base = p_iovec->iov_base;
if( i_len <= 0 )
{
continue;
}
i_bytes = read( dvdcss->i_fd, p_base, i_len );
if( i_bytes < 0 )
{
/* One of the reads failed, too bad.
* We won't even bother returning the reads that went OK,
* and as in the POSIX spec the file position is left
* unspecified after a failure */
dvdcss->i_pos = -1;
return -1;
}
i_total += i_bytes;
i_total /= DVDCSS_BLOCK_SIZE;
if( i_bytes != i_len )
{
/* We reached the end of the file or a signal interrupted
* the read. Return a partial read. */
int i_seek;
dvdcss->i_pos = -1;
i_seek = libc_seek( dvdcss, i_total );
if( i_seek < 0 )
{
return i_seek;
}
/* We have to return now so that i_pos isn't clobbered */
return i_total;
}
}
dvdcss->i_pos += i_total;
return i_total;
#else
int i_read = readv( dvdcss->i_fd, p_iovec, i_blocks );
if( i_read < 0 )
{
dvdcss->i_pos = -1;
return i_read;
}
i_read /= DVDCSS_BLOCK_SIZE;
dvdcss->i_pos += i_read;
return i_read;
#endif
}
/*****************************************************************************
* stream_readv: vectored read
*****************************************************************************/
static int stream_readv ( dvdcss_t dvdcss, const struct iovec *p_iovec,
int i_blocks )
{
int i_read;
if( !dvdcss->p_stream_cb->pf_readv )
return -1;
i_read = dvdcss->p_stream_cb->pf_readv( dvdcss->p_stream, p_iovec,
i_blocks );
if( i_read < 0 )
{
dvdcss->i_pos = -1;
return i_read;
}
dvdcss->i_pos += i_read / DVDCSS_BLOCK_SIZE;
return i_read / DVDCSS_BLOCK_SIZE;
}
#if defined( _WIN32 )
/*****************************************************************************
* win2k_readv: vectored read using ReadFile for Win2K
*****************************************************************************/
static int win2k_readv ( dvdcss_t dvdcss, const struct iovec *p_iovec,
int i_blocks )
{
int i_index;
int i_blocks_read, i_blocks_total = 0;
DWORD i_bytes;
/* Check the size of the readv temp buffer, just in case we need to
* realloc something bigger */
if( dvdcss->i_readv_buf_size < i_blocks * DVDCSS_BLOCK_SIZE )
{
dvdcss->i_readv_buf_size = i_blocks * DVDCSS_BLOCK_SIZE;
free( dvdcss->p_readv_buffer );
/* Allocate a buffer which will be used as a temporary storage
* for readv */
dvdcss->p_readv_buffer = malloc( dvdcss->i_readv_buf_size );
if( !dvdcss->p_readv_buffer )
{
print_error( dvdcss, "scatter input (readv) failed" );
dvdcss->i_pos = -1;
return -1;
}
}
for( i_index = i_blocks; i_index; i_index-- )
{
i_blocks_total += p_iovec[i_index-1].iov_len;
}
if( i_blocks_total <= 0 ) return 0;
if( !ReadFile( (HANDLE)dvdcss->i_fd, dvdcss->p_readv_buffer,
i_blocks_total, &i_bytes, NULL ) )
{
/* The read failed... too bad.
* As in the POSIX spec the file position is left
* unspecified after a failure */
dvdcss->i_pos = -1;
return -1;
}
i_blocks_read = i_bytes / DVDCSS_BLOCK_SIZE;
/* We just have to copy the content of the temp buffer into the iovecs */
for( i_index = 0, i_blocks_total = i_blocks_read;
i_blocks_total > 0;
i_index++ )
{
memcpy( p_iovec[i_index].iov_base,
dvdcss->p_readv_buffer + (i_blocks_read - i_blocks_total)
* DVDCSS_BLOCK_SIZE,
p_iovec[i_index].iov_len );
/* if we read less blocks than asked, we'll just end up copying
* garbage, this isn't an issue as we return the number of
* blocks actually read */
i_blocks_total -= ( p_iovec[i_index].iov_len / DVDCSS_BLOCK_SIZE );
}
dvdcss->i_pos += i_blocks_read;
return i_blocks_read;
}
#endif /* defined( _WIN32 ) */