public Protect(SafeProcessHandle handle, VirtualQueryInfo info, int protect)
{
this.handle = handle;
this.info = info;
this.protect = protect;
if (protect == info.Protect)
return;
int oldProtect;
if (!Win32.VirtualProtectEx(handle.DangerousGetHandle(), (IntPtr)info.StartAddress, (IntPtr)info.RegionSize, protect, out oldProtect))
throw new Win32Exception();
}
Protect SetProtect(VirtualQueryInfo info, bool write)
{
var protect = info.Protect;
if (!info.Mapped) // Can't change protection on mapped memory
{
if ((protect & Win32.PAGE_GUARD) != 0)
protect ^= Win32.PAGE_GUARD;
var extra = protect & ~(Win32.PAGE_GUARD - 1);
if (write)
{
if ((protect & (Win32.PAGE_EXECUTE | Win32.PAGE_EXECUTE_READ | Win32.PAGE_EXECUTE_WRITECOPY)) != 0)
protect = Win32.PAGE_EXECUTE_READWRITE;
if ((protect & (Win32.PAGE_NOACCESS | Win32.PAGE_READONLY | Win32.PAGE_WRITECOPY)) != 0)
protect = Win32.PAGE_READWRITE;
}
else
{
if ((protect & Win32.PAGE_NOACCESS) != 0)
protect = Win32.PAGE_READONLY;
}
protect |= extra;
}
return new Protect(handle, info, protect);
}
VirtualQueryInfo VirtualQuery(long index)
{
var max = UIntPtr.Size == 4 ? uint.MaxValue : ulong.MaxValue;
if ((ulong)index >= max)
return null;
Win32.MEMORY_BASIC_INFORMATION memInfo;
if (Win32.VirtualQueryEx(handle.DangerousGetHandle(), (IntPtr)index, out memInfo, Win32.MEMORY_BASIC_INFORMATION.Size) == 0)
{
if (Win32.LastError != Win32.ERROR_INVALID_PARAMETER)
throw new Win32Exception();
return null;
}
var info = new VirtualQueryInfo();
info.Committed = (memInfo.State & Win32.MEM_COMMIT) != 0;
info.Mapped = (memInfo.Type & Win32.MEM_MAPPED) != 0;
info.NoAccess = (memInfo.Protect & Win32.PAGE_NOACCESS) != 0;
info.StartAddress = memInfo.BaseAddress.ToInt64();
info.RegionSize = (long)Math.Min((ulong)memInfo.RegionSize.ToInt64(), max - (ulong)memInfo.BaseAddress.ToInt64());
info.EndAddress = memInfo.BaseAddress.ToInt64() + info.RegionSize;
info.Protect = memInfo.Protect;
return info;
}
