Sweden-Number/dlls/winedos/int25.c

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/*
* DOS interrupt 25h handler
*
* Copyright 1997 Andreas Mohr
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "msdos.h"
#include "miscemu.h"
#include "drive.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
/***********************************************************************
* DOSVM_RawRead
*
* Read raw sectors from a device.
*/
BOOL DOSVM_RawRead(BYTE drive, DWORD begin, DWORD nr_sect, BYTE *dataptr, BOOL fake_success)
{
int fd;
if ((fd = DRIVE_OpenDevice( drive, O_RDONLY )) != -1)
{
lseek( fd, begin * 512, SEEK_SET );
/* FIXME: check errors */
read( fd, dataptr, nr_sect * 512 );
close( fd );
}
else
{
memset( dataptr, 0, nr_sect * 512 );
if (fake_success)
{
/* FIXME: explain what happens here */
if (begin == 0 && nr_sect > 1) *(dataptr + 512) = 0xf8;
if (begin == 1) *dataptr = 0xf8;
}
else
return FALSE;
}
return TRUE;
}
/**********************************************************************
* DOSVM_Int25Handler (WINEDOS16.137)
*
* Handler for int 25h (absolute disk read).
*/
void WINAPI DOSVM_Int25Handler( CONTEXT86 *context )
{
WCHAR drivespec[4] = {'A', ':', '\\', 0};
BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
DWORD begin;
DWORD length;
drivespec[0] += AL_reg( context );
if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
{
SET_CFLAG( context );
SET_AX( context, 0x0201 ); /* unknown unit */
return;
}
if (CX_reg( context ) == 0xffff)
{
begin = *(DWORD *)dataptr;
length = *(WORD *)(dataptr + 4);
dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
*(WORD *)(dataptr + 8),
*(DWORD *)(dataptr + 6) );
}
else
{
begin = DX_reg( context );
length = CX_reg( context );
}
TRACE( "abs diskread, drive %d, sector %ld, "
"count %ld, buffer %p\n",
AL_reg( context ), begin, length, dataptr );
DOSVM_RawRead( AL_reg( context ), begin, length, dataptr, TRUE );
RESET_CFLAG( context );
}