diff options
Diffstat (limited to 'src/device.c')
| -rw-r--r-- | src/device.c | 889 |
1 files changed, 889 insertions, 0 deletions
diff --git a/src/device.c b/src/device.c new file mode 100644 index 0000000..34b610b --- /dev/null +++ b/src/device.c @@ -0,0 +1,889 @@ +/***************************************************************************** + * 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" + +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.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 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; +#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 ) */ |