/// <summary>
/// take a snapshot of the entire memory block's contents, for use in GetXorStream
/// </summary>
public void SaveXorSnapshot()
{
if (_snapshot != null)
{
throw new InvalidOperationException("Snapshot already taken");
}
if (!Active)
{
throw new InvalidOperationException("Not active");
}
// temporarily switch the entire block to `R`: in case some areas are unreadable, we don't want
// that to complicate things
Kernel32.MemoryProtection old;
if (!Kernel32.VirtualProtect(Z.UU(Start), Z.UU(Size), Kernel32.MemoryProtection.READONLY, out old))
{
throw new InvalidOperationException($"{nameof(Kernel32.VirtualProtect)}() returned FALSE!");
}
_snapshot = new byte[Size];
var ds = new MemoryStream(_snapshot, true);
var ss = GetStream(Start, Size, false);
ss.CopyTo(ds);
XorHash = WaterboxUtils.Hash(_snapshot);
ProtectAll();
}
/// <summary>
/// take a snapshot of the entire memory block's contents, for use in GetXorStream
/// </summary>
public override void SaveXorSnapshot()
{
if (_snapshot != null)
{
throw new InvalidOperationException("Snapshot already taken");
}
if (!Active)
{
throw new InvalidOperationException("Not active");
}
// temporarily switch the entire block to `R`: in case some areas are unreadable, we don't want
// that to complicate things
if (mprotect(Z.US(Start), Z.UU(Size), MemoryProtection.Read) != 0)
{
throw new InvalidOperationException("mprotect() returned -1!");
}
_snapshot = new byte[Size];
var ds = new MemoryStream(_snapshot, true);
var ss = GetStream(Start, Size, false);
ss.CopyTo(ds);
XorHash = WaterboxUtils.Hash(_snapshot);
ProtectAll();
}
/// <summary>
/// take a hash of the current full contents of the block, including unreadable areas
/// </summary>
/// <returns></returns>
public override byte[] FullHash()
{
if (!Active)
{
throw new InvalidOperationException("Not active");
}
// temporarily switch the entire block to `R`
if (mprotect(Z.US(Start), Z.UU(Size), MemoryProtection.Read) != 0)
{
throw new InvalidOperationException("mprotect() returned -1!");
}
var ret = WaterboxUtils.Hash(GetStream(Start, Size, false));
ProtectAll();
return(ret);
}
/// <summary>
/// take a hash of the current full contents of the block, including unreadable areas
/// </summary>
public byte[] FullHash()
{
if (!Active)
{
throw new InvalidOperationException("Not active");
}
// temporarily switch the entire block to `R`
Kernel32.MemoryProtection old;
if (!Kernel32.VirtualProtect(Z.UU(Start), Z.UU(Size), Kernel32.MemoryProtection.READONLY, out old))
{
throw new InvalidOperationException($"{nameof(Kernel32.VirtualProtect)}() returned FALSE!");
}
var ret = WaterboxUtils.Hash(GetStream(Start, Size, false));
ProtectAll();
return(ret);
}
/// <exception cref="InvalidOperationException"><see cref="MemoryBlockBase.Active"/> is <see langword="false"/> or failed to make memory read-only</exception>
public override byte[] FullHash()
{
if (!Active)
{
throw new InvalidOperationException("Not active");
}
// temporarily switch the entire block to `R`
var exitCode = mprotect(Z.US(AddressRange.Start), Z.UU(Size), MemoryProtection.Read);
if (exitCode != 0)
{
throw new InvalidOperationException($"{nameof(mprotect)}() returned {exitCode}!");
}
var ret = WaterboxUtils.Hash(GetStream(AddressRange.Start, Size, false));
ProtectAll();
return(ret);
}
/// <exception cref="InvalidOperationException">snapshot already taken, <see cref="MemoryBlockBase.Active"/> is <see langword="false"/>, or failed to make memory read-only</exception>
public override void SaveXorSnapshot()
{
if (_snapshot != null)
{
throw new InvalidOperationException("Snapshot already taken");
}
if (!Active)
{
throw new InvalidOperationException("Not active");
}
// temporarily switch the entire block to `R`: in case some areas are unreadable, we don't want that to complicate things
var exitCode = mprotect(Z.US(AddressRange.Start), Z.UU(Size), MemoryProtection.Read);
if (exitCode != 0)
{
throw new InvalidOperationException($"{nameof(mprotect)}() returned {exitCode}!");
}
_snapshot = new byte[Size];
GetStream(AddressRange.Start, Size, false).CopyTo(new MemoryStream(_snapshot, true));
XorHash = WaterboxUtils.Hash(_snapshot);
ProtectAll();
}
