bool ModifyReparsePoint(const wchar_t *Object,const wchar_t *NewData)
{
bool Result=false;
LPBYTE szBuff=new BYTE[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
if(szBuff)
{
PREPARSE_DATA_BUFFER rdb=reinterpret_cast<PREPARSE_DATA_BUFFER>(szBuff);
if (GetREPARSE_DATA_BUFFER(Object,rdb))
{
bool FillResult=false;
switch (rdb->ReparseTag)
{
case IO_REPARSE_TAG_MOUNT_POINT:
{
string strPrintName,strSubstituteName;
ConvertNameToFull(NewData,strPrintName);
strSubstituteName=L"\\??\\";
strSubstituteName+=(strPrintName.CPtr()+(HasPathPrefix(strPrintName)?4:0));
FillResult=FillREPARSE_DATA_BUFFER(rdb,strPrintName,strPrintName.GetLength(),strSubstituteName,strSubstituteName.GetLength());
}
break;
case IO_REPARSE_TAG_SYMLINK:
{
string strPrintName=NewData,strSubstituteName=NewData;
if (IsAbsolutePath(NewData))
{
strSubstituteName=L"\\??\\";
strSubstituteName+=(strPrintName.CPtr()+(HasPathPrefix(strPrintName)?4:0));
rdb->SymbolicLinkReparseBuffer.Flags=0;
}
else
{
rdb->SymbolicLinkReparseBuffer.Flags=SYMLINK_FLAG_RELATIVE;
}
FillResult=FillREPARSE_DATA_BUFFER(rdb,strPrintName,strPrintName.GetLength(),strSubstituteName,strSubstituteName.GetLength());
}
break;
}
if (FillResult)
{
Result=SetREPARSE_DATA_BUFFER(Object,rdb);
}
else
{
SetLastError(ERROR_INSUFFICIENT_BUFFER);
}
}
delete[] szBuff;
}
return Result;
}
DWORD WINAPI GetReparsePointInfo(const wchar_t *Object, string &strDestBuff,LPDWORD lpReparseTag)
{
WORD NameLength=0;
LPBYTE szBuff=new BYTE[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
if(szBuff)
{
PREPARSE_DATA_BUFFER rdb = reinterpret_cast<PREPARSE_DATA_BUFFER>(szBuff);
if (GetREPARSE_DATA_BUFFER(Object,rdb))
{
const wchar_t *PathBuffer;
if (lpReparseTag)
*lpReparseTag=rdb->ReparseTag;
if (rdb->ReparseTag == IO_REPARSE_TAG_SYMLINK)
{
NameLength = rdb->SymbolicLinkReparseBuffer.PrintNameLength/sizeof(wchar_t);
if (NameLength)
{
PathBuffer = &rdb->SymbolicLinkReparseBuffer.PathBuffer[rdb->SymbolicLinkReparseBuffer.PrintNameOffset/sizeof(wchar_t)];
}
else
{
NameLength = rdb->SymbolicLinkReparseBuffer.SubstituteNameLength/sizeof(wchar_t);
PathBuffer = &rdb->SymbolicLinkReparseBuffer.PathBuffer[rdb->SymbolicLinkReparseBuffer.SubstituteNameOffset/sizeof(wchar_t)];
}
}
else
{
NameLength = rdb->MountPointReparseBuffer.PrintNameLength/sizeof(wchar_t);
if (NameLength)
{
PathBuffer = &rdb->MountPointReparseBuffer.PathBuffer[rdb->MountPointReparseBuffer.PrintNameOffset/sizeof(wchar_t)];
}
else
{
NameLength = rdb->MountPointReparseBuffer.SubstituteNameLength/sizeof(wchar_t);
PathBuffer = &rdb->MountPointReparseBuffer.PathBuffer[rdb->MountPointReparseBuffer.SubstituteNameOffset/sizeof(wchar_t)];
}
}
wchar_t *lpwszDestBuff=strDestBuff.GetBuffer(NameLength+1);
wcsncpy(lpwszDestBuff,PathBuffer,NameLength);
strDestBuff.ReleaseBuffer(NameLength);
}
delete[] szBuff;
}
return NameLength;
}
bool DeleteReparsePoint(const string& Object)
{
block_ptr<REPARSE_DATA_BUFFER> rdb(MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (!GetREPARSE_DATA_BUFFER(Object, rdb.get()))
return false;
const os::fs::file fObject(Object, GetDesiredAccessForReparsePointChange(), 0, nullptr, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT);
if (!fObject)
return false;
DWORD dwBytes;
REPARSE_GUID_DATA_BUFFER rgdb{rdb->ReparseTag};
return fObject.IoControl(FSCTL_DELETE_REPARSE_POINT,&rgdb,REPARSE_GUID_DATA_BUFFER_HEADER_SIZE,nullptr,0,&dwBytes);
}
bool ModifyReparsePoint(const string& Object,const string& NewData)
{
block_ptr<REPARSE_DATA_BUFFER> rdb(MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (!GetREPARSE_DATA_BUFFER(Object, rdb.get()))
return false;
switch (rdb->ReparseTag)
{
case IO_REPARSE_TAG_MOUNT_POINT:
{
const auto strPrintName = ConvertNameToFull(NewData);
const auto strSubstituteName = KernelPath(NTPath(strPrintName));
if (!FillREPARSE_DATA_BUFFER(rdb.get(), strPrintName, strSubstituteName))
{
SetLastError(ERROR_INSUFFICIENT_BUFFER);
return false;
}
}
break;
case IO_REPARSE_TAG_SYMLINK:
{
const auto& strPrintName = NewData;
auto strSubstituteName = NewData;
if (IsAbsolutePath(NewData))
{
strSubstituteName = KernelPath(NTPath(strSubstituteName));
rdb->SymbolicLinkReparseBuffer.Flags=0;
}
else
{
rdb->SymbolicLinkReparseBuffer.Flags=SYMLINK_FLAG_RELATIVE;
}
if (!FillREPARSE_DATA_BUFFER(rdb.get(), strPrintName, strSubstituteName))
{
SetLastError(ERROR_INSUFFICIENT_BUFFER);
return false;
}
}
break;
default:
return false;
}
return SetREPARSE_DATA_BUFFER(Object,rdb.get());
}
bool DuplicateReparsePoint(const wchar_t *Src,const wchar_t *Dst)
{
bool Result=false;
LPBYTE szBuff=new BYTE[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
if(szBuff)
{
PREPARSE_DATA_BUFFER rdb=reinterpret_cast<PREPARSE_DATA_BUFFER>(szBuff);
if (GetREPARSE_DATA_BUFFER(Src,rdb) && SetREPARSE_DATA_BUFFER(Dst,rdb))
{
Result=true;
}
delete[] szBuff;
}
return Result;
}
bool GetReparsePointInfo(const string& Object, string &strDestBuff,LPDWORD ReparseTag)
{
block_ptr<REPARSE_DATA_BUFFER> rdb(MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (!GetREPARSE_DATA_BUFFER(Object, rdb.get()))
return false;
if (ReparseTag)
*ReparseTag=rdb->ReparseTag;
const auto& Extract = [&](const auto& Buffer)
{
const wchar_t *PathBuffer = nullptr;
auto NameLength = Buffer.PrintNameLength / sizeof(wchar_t);
if (NameLength)
{
PathBuffer = &Buffer.PathBuffer[Buffer.PrintNameOffset / sizeof(wchar_t)];
}
else
{
NameLength = Buffer.SubstituteNameLength / sizeof(wchar_t);
PathBuffer = &Buffer.PathBuffer[Buffer.SubstituteNameOffset / sizeof(wchar_t)];
}
if (!NameLength)
return false;
strDestBuff.assign(PathBuffer, NameLength);
return true;
};
switch (rdb->ReparseTag)
{
case IO_REPARSE_TAG_SYMLINK:
return Extract(rdb->SymbolicLinkReparseBuffer);
case IO_REPARSE_TAG_MOUNT_POINT:
return Extract(rdb->MountPointReparseBuffer);
default:
return false;
}
}
bool DeleteReparsePoint(const string& Object)
{
bool Result=false;
LPBYTE Buff=new BYTE[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
if(Buff)
{
PREPARSE_DATA_BUFFER rdb = reinterpret_cast<PREPARSE_DATA_BUFFER>(Buff);
if (GetREPARSE_DATA_BUFFER(Object,rdb))
{
File fObject;
if (fObject.Open(Object, FILE_WRITE_ATTRIBUTES, 0, 0, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT))
{
DWORD dwBytes;
REPARSE_GUID_DATA_BUFFER rgdb = {rdb->ReparseTag};
Result=fObject.IoControl(FSCTL_DELETE_REPARSE_POINT,&rgdb,REPARSE_GUID_DATA_BUFFER_HEADER_SIZE,nullptr,0,&dwBytes);
fObject.Close();
}
}
}
return Result;
}
bool DuplicateReparsePoint(const string& Src,const string& Dst)
{
block_ptr<REPARSE_DATA_BUFFER> rdb(MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
return GetREPARSE_DATA_BUFFER(Src, rdb.get()) && SetREPARSE_DATA_BUFFER(Dst, rdb.get());
}
