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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace PGFSharp
{
internal static class NativeGU
{
const string LIBNAME = "gu.dll";
const CallingConvention CC = CallingConvention.Cdecl;
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_new_pool();
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_new_exn(IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern void gu_pool_free(IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr get_gu_null_variant();
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_string_buf_out(IntPtr sbuf);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_new_string_buf(IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_data_in(IntPtr str, int len, IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_string_buf_freeze(IntPtr sbuf, IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
[return: MarshalAs(UnmanagedType.I1)]
public static extern bool gu_exn_is_raised(IntPtr err);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern void gu_enum_next(IntPtr enum_, ref IntPtr outPtr, IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern GuVariantInfo gu_variant_open(IntPtr variant);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_alloc_variant(byte tag, UIntPtr size, UIntPtr align, ref IntPtr out_, IntPtr pool);
[DllImport(LIBNAME, CallingConvention = CC)]
public static extern IntPtr gu_make_variant(byte tag, UIntPtr size, UIntPtr align, ref IntPtr init, IntPtr pool);
[StructLayout(LayoutKind.Sequential)]
public struct GuVariantInfo
{
public int Tag;
public IntPtr Data;
}
[StructLayout(LayoutKind.Sequential)]
public struct GuSeq
{
public UIntPtr length;
}
public static uint SeqLength(IntPtr seqptr)
{
var seq = Marshal.PtrToStructure<GuSeq>(seqptr);
return (uint)seq.length;
}
public static T gu_seq_index<T>(IntPtr seq, int index)
{
var dataPtr = seq + Marshal.SizeOf<GuSeq>();
var hypoPtr = dataPtr + index * Marshal.SizeOf<T>();
var hypo = Marshal.PtrToStructure<T>(hypoPtr);
return hypo;
}
public class NativeMemoryPool
{
private IntPtr _ptr;
internal IntPtr Ptr => _ptr;
public NativeMemoryPool()
{
_ptr = gu_new_pool();
if (_ptr == IntPtr.Zero) throw new Exception();
}
~NativeMemoryPool()
{
gu_pool_free(_ptr);
_ptr = IntPtr.Zero;
}
}
public class NativeExceptionContext
{
private IntPtr _ptr;
internal IntPtr Ptr => _ptr;
public NativeExceptionContext(NativeMemoryPool pool)
{
_ptr = gu_new_exn(pool.Ptr);
if (_ptr == IntPtr.Zero) throw new Exception();
}
public bool IsRaised => gu_exn_is_raised(_ptr);
}
public static IEnumerable<IntPtr> IteratorToIEnumerable(IntPtr iterator, IntPtr pool)
{
IntPtr ptr = IntPtr.Zero;
NativeGU.gu_enum_next(iterator, ref ptr, pool);
while (ptr != IntPtr.Zero)
{
yield return ptr;
NativeGU.gu_enum_next(iterator, ref ptr, pool);
}
}
}
}
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