forked from Mirrors/wine-wine
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
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* DOS interrupt 25h handler
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*
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* Copyright 1997 Andreas Mohr
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include "dosexe.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int);
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/***********************************************************************
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* DOSVM_RawRead
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*
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* Read raw sectors from a device.
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*/
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BOOL DOSVM_RawRead(BYTE drive, DWORD begin, DWORD nr_sect, BYTE *dataptr, BOOL fake_success)
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{
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WCHAR root[] = {'\\','\\','.','\\','A',':',0};
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HANDLE h;
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TRACE( "abs diskread, drive %d, sector %d, "
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"count %d, buffer %p\n",
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drive, begin, nr_sect, dataptr );
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root[4] += drive;
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h = CreateFileW(root, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
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FILE_FLAG_BACKUP_SEMANTICS, NULL);
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if (h != INVALID_HANDLE_VALUE)
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{
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DWORD r;
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SetFilePointer(h, begin * 512, NULL, SEEK_SET );
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/* FIXME: check errors */
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ReadFile(h, dataptr, nr_sect * 512, &r, NULL );
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CloseHandle(h);
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}
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else
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{
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memset( dataptr, 0, nr_sect * 512 );
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if (fake_success)
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{
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/* FIXME: explain what happens here */
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if (begin == 0 && nr_sect > 1) *(dataptr + 512) = 0xf8;
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if (begin == 1) *dataptr = 0xf8;
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}
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else
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return FALSE;
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}
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return TRUE;
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}
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/**********************************************************************
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* DOSVM_Int25Handler
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*
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* Handler for int 25h (absolute disk read).
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*/
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void WINAPI DOSVM_Int25Handler( CONTEXT *context )
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{
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WCHAR drivespec[] = {'A', ':', '\\', 0};
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BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
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DWORD begin;
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DWORD length;
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drivespec[0] += AL_reg( context );
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if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
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GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
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{
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SET_CFLAG( context );
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SET_AX( context, 0x0201 ); /* unknown unit */
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return;
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}
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if (CX_reg( context ) == 0xffff)
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{
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begin = *(DWORD *)dataptr;
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length = *(WORD *)(dataptr + 4);
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dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
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*(WORD *)(dataptr + 8),
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*(DWORD *)(dataptr + 6) );
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}
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else
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{
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begin = DX_reg( context );
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length = CX_reg( context );
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}
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DOSVM_RawRead( AL_reg( context ), begin, length, dataptr, TRUE );
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RESET_CFLAG( context );
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}
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