Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-06-22 22:11:39 +00:00
Code Issues Packages Projects Releases Wiki Activity

[NTVDM] Allow opening files with write access on CDROM

Browse source 
Some applications, run on a CDROM, may attempt to open
a file with write access. CDFS driver will deny such
request in ReactOS (but also in Windows NT). Then, to
restore that behavior from old Windows (9X), our ntvdm,
as Microsoft ntvdm will attempt to reopen the file only
with read access, if opening failed because of denied access
and if the file is on a CDROM.

CORE-15211
This commit is contained in:
Pierre Schweitzer 2018-10-20 12:53:52 +02:00
parent 44898a4ea4
commit 827ed4b146
1 changed files with 27 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
View file

@ -161,6 +161,21 @@ static BOOLEAN DosChangeDirectory(LPSTR Directory)
return TRUE;
}
static BOOLEAN DosIsFileOnCdRom(VOID)
{
UINT DriveType;
CHAR RootPathName[4];
/* Construct a simple <letter>:\ string to get drive type */
RootPathName[0] = Sda->CurrentDrive + 'A';
RootPathName[1] = ':';
RootPathName[2] = '\\';
RootPathName[3] = ANSI_NULL;
DriveType = GetDriveTypeA(RootPathName);
return (DriveType == DRIVE_CDROM);
}
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN DosControlBreak(VOID)
@ -950,8 +965,19 @@ VOID WINAPI DosInt21h(LPWORD Stack)
case 0x3D:
{
WORD FileHandle;
BYTE AccessShareModes = getAL();
LPCSTR FileName = (LPCSTR)SEG_OFF_TO_PTR(getDS(), getDX());
WORD ErrorCode = DosOpenFile(&FileHandle, FileName, getAL());
WORD ErrorCode = DosOpenFile(&FileHandle, FileName, AccessShareModes);
/*
* Check if we failed because we attempted to open a file for write
* on a CDROM drive. In that situation, attempt to reopen for read
*/
if (ErrorCode == ERROR_ACCESS_DENIED &&
(AccessShareModes & 0x03) != 0 && DosIsFileOnCdRom())
{
ErrorCode = DosOpenFile(&FileHandle, FileName, 0);
}
if (ErrorCode == ERROR_SUCCESS)
{