// Reads 'count' structs of type T from unmanaged memory, into 'array' starting at 'offset'.
// Note: this method is not safe, since it overwrites the contents of structures, it can
// be used to modify the private members of a struct.
public int ReadArray <T>(long position, T[] array, int offset, int count) where T : struct
{
if (array == null)
{
throw new ArgumentNullException(nameof(array), SR.ArgumentNull_Buffer);
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - offset < count)
{
throw new ArgumentException(SR.Argument_InvalidOffLen);
}
if (!_isOpen)
{
throw new ObjectDisposedException(nameof(UnmanagedMemoryAccessor), SR.ObjectDisposed_ViewAccessorClosed);
}
if (!_canRead)
{
throw new NotSupportedException(SR.NotSupported_Reading);
}
if (position < 0)
{
throw new ArgumentOutOfRangeException(nameof(position), SR.ArgumentOutOfRange_NeedNonNegNum);
}
uint sizeOfT = SafeBuffer.AlignedSizeOf <T>();
// only check position and ask for fewer Ts if count is too big
if (position >= _capacity)
{
throw new ArgumentOutOfRangeException(nameof(position), SR.ArgumentOutOfRange_PositionLessThanCapacityRequired);
}
int n = count;
long spaceLeft = _capacity - position;
if (spaceLeft < 0)
{
n = 0;
}
else
{
ulong spaceNeeded = (ulong)(sizeOfT * count);
if ((ulong)spaceLeft < spaceNeeded)
{
n = (int)(spaceLeft / sizeOfT);
}
}
_buffer.ReadArray <T>((ulong)(_offset + position), array, offset, n);
return(n);
}
private static string[] ReadStrings(SafeBuffer buffer, int count)
{
IntPtr[] ptrs = new IntPtr[count];
buffer.ReadArray(0, ptrs, 0, count);
return(ptrs.Select(p => GetString(p)).ToArray());
}
private static AuthZAccessCheckResult[] CreateResult(int count, SafeBuffer error, SafeBuffer access,
ObjectTypeEntry[] object_types, NtType type)
{
int[] error_array = new int[count];
error.ReadArray(0, error_array, 0, count);
AccessMask[] access_array = new AccessMask[count];
access.ReadArray(0, access_array, 0, count);
return(Enumerable.Range(0, count).Select(i => new AuthZAccessCheckResult(type, (Win32Error)error_array[i],
access_array[i], object_types?[i])).ToArray());
}
public int ReadArray <T> (long position, T [] array, int offset, int count) where T : struct
{
if (position < 0)
{
throw new ArgumentOutOfRangeException();
}
long left = capacity - position;
var slots = (int)(left / Marshal.SizeOf(typeof(T)));
buffer.ReadArray((ulong)position, array, offset, slots);
return(slots);
}
/// <summary>
/// Extends ReadArray<T> so that buffer offset of 0 and call to Array.Length are not needed.
/// <example>
/// safebuffer.ReadArray<T>(byteOffset, array);
/// </example>
/// </summary>
public static void ReadArray <T>(this SafeBuffer safebuffer, UInt64 byteOffset, T[] array) where T : struct
{
if (safebuffer == null)
{
throw new ArgumentNullException("safebuffer");
}
if (array == null)
{
throw new ArgumentNullException("array");
}
safebuffer.ReadArray(byteOffset, array, 0, array.Length);
}
/// <summary>
// Reads 'count' structs of type T from unmanaged memory, into 'array' starting at 'offset'.
// Note: this method is not safe, since it overwrites the contents of structures, it can
// be used to modify the private members of a struct.
/// </summary>
public int ReadArray <T>(Int64 position, T[] array, Int32 offset, Int32 count) where T : struct
{
if (array == null)
{
throw new ArgumentNullException(nameof(array), SR.ArgumentNull_Buffer);
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (array.Length - offset < count)
{
throw new ArgumentException(SR.Argument_InvalidOffLen);
}
Contract.EndContractBlock();
EnsureSafeToRead(position, 0);
// ask for fewer Ts if count is too big
UInt32 sizeOfT = SafeBuffer.AlignedSizeOf <T>();
int n = count;
long spaceLeft = _capacity - position;
if (spaceLeft < 0)
{
n = 0;
}
else
{
ulong spaceNeeded = (ulong)(sizeOfT * count);
if ((ulong)spaceLeft < spaceNeeded)
{
n = (int)(spaceLeft / sizeOfT);
}
}
_buffer.ReadArray <T>((UInt64)(_offset + position), array, offset, n);
return(n);
}
public static IEnumerable <GroupSecurityIdentifierInformation> GetAllGroups(this WindowsIdentity windowsIdentity)
{
// Get the raw group information, which is a buffer starting with a TOKEN_GROUPS structure
using (SafeBuffer groupInformation = Win32Native.GetTokenInformation(windowsIdentity.GetSafeTokenHandle(),
Win32Native.TokenInformationClass.TokenGroups))
{
// First, read the TOKEN_GROUPS header out of the buffer
Win32Native.TOKEN_GROUPS tokenGroups = groupInformation.Read <Win32Native.TOKEN_GROUPS>(0);
// The TOKEN_GROUPS.Group property is an array of SID_AND_ATTRIBUTES structures. Grab that
// array of data.
// Iterate that array, and create managed GroupSecurityIdentifierInformation types for them.
Win32Native.SID_AND_ATTRIBUTES[] sids =
groupInformation.ReadArray <Win32Native.SID_AND_ATTRIBUTES>(Marshal.OffsetOf(typeof(Win32Native.TOKEN_GROUPS), "Groups").ToInt32(),
tokenGroups.GroupCount);
var sidInfo = from sid in sids
select new GroupSecurityIdentifierInformation(new SecurityIdentifier(sid.Sid), (GroupSecurityIdentifierAttributes)sid.Attributes);
// Force the conversion to GroupSecurityIdentifierInformation now, rather than lazily since
// we need to read the data out of the buffer which will be disposed of after this method exits.
return(sidInfo.ToArray());
}
}
[System.Security.SecurityCritical] // auto-generated_required
public int ReadArray <T>(Int64 position, T[] array, Int32 offset, Int32 count) where T : struct
{
if (array == null)
{
throw new ArgumentNullException("array", "Buffer cannot be null.");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (array.Length - offset < count)
{
throw new ArgumentException(Environment.GetResourceString("Argument_OffsetAndLengthOutOfBounds"));
}
Contract.EndContractBlock();
if (!CanRead)
{
if (!_isOpen)
{
throw new ObjectDisposedException("UnmanagedMemoryAccessor", Environment.GetResourceString("ObjectDisposed_ViewAccessorClosed"));
}
else
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_Reading"));
}
}
if (position < 0)
{
throw new ArgumentOutOfRangeException("position", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
UInt32 sizeOfT = Marshal.AlignedSizeOf <T>();
// only check position and ask for fewer Ts if count is too big
if (position >= _capacity)
{
throw new ArgumentOutOfRangeException("position", Environment.GetResourceString("ArgumentOutOfRange_PositionLessThanCapacityRequired"));
}
int n = count;
long spaceLeft = _capacity - position;
if (spaceLeft < 0)
{
n = 0;
}
else
{
ulong spaceNeeded = (ulong)(sizeOfT * count);
if ((ulong)spaceLeft < spaceNeeded)
{
n = (int)(spaceLeft / sizeOfT);
}
}
_buffer.ReadArray <T>((UInt64)(_offset + position), array, offset, n);
return(n);
}
/// <summary>
/// Read bytes from buffer.
/// </summary>
/// <param name="buffer">The buffer to read from.</param>
/// <param name="byte_offset">The byte offset to read from.</param>
/// <param name="count">The number of bytes to read.</param>
/// <returns>The byte array.</returns>
public static byte[] ReadBytes(SafeBuffer buffer, ulong byte_offset, int count)
{
byte[] ret = new byte[count];
buffer.ReadArray(byte_offset, ret, 0, count);
return(ret);
}
/// <summary>
/// Read a Unicode string string with length.
/// </summary>
/// <param name="buffer">The buffer to read from.</param>
/// <param name="count">The number of characters to read.</param>
/// <param name="byte_offset">The byte offset to read from.</param>
/// <returns>The string read from the buffer without the NUL terminator</returns>
public static string ReadUnicodeString(SafeBuffer buffer, ulong byte_offset, int count)
{
char[] ret = new char[count];
buffer.ReadArray(byte_offset, ret, 0, count);
return(new string(ret));
}
/// <summary>
/// Read a char array with length.
/// </summary>
/// <param name="buffer">The buffer to read from.</param>
/// <param name="count">The number of characters to read.</param>
/// <param name="byte_offset">The byte offset to read from.</param>
/// <returns>The chars read from the buffer</returns>
public static char[] ReadCharArray(SafeBuffer buffer, ulong byte_offset, int count)
{
char[] ret = new char[count];
buffer.ReadArray(byte_offset, ret, 0, count);
return(ret);
}
