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118 lines (113 loc) · 4.01 KB
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using System;
using System.Runtime.InteropServices;
namespace Python.Runtime
{
/* buffer interface */
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
internal struct Py_buffer {
public IntPtr buf;
public IntPtr obj; /* owned reference */
/// <summary>Buffer size in bytes</summary>
[MarshalAs(UnmanagedType.SysInt)]
public nint len;
[MarshalAs(UnmanagedType.SysInt)]
public nint itemsize; /* This is Py_ssize_t so it can be
pointed to by strides in simple case.*/
[MarshalAs(UnmanagedType.Bool)]
public bool _readonly;
public int ndim;
[MarshalAs(UnmanagedType.LPStr)]
public string? format;
public IntPtr shape;
public IntPtr strides;
public IntPtr suboffsets;
public IntPtr _internal;
}
public enum BufferOrderStyle
{
C,
Fortran,
EitherOne,
}
/* Flags for getting buffers */
public enum PyBUF
{
/// <summary>
/// Simple buffer without shape strides and suboffsets
/// </summary>
SIMPLE = 0,
/// <summary>
/// Controls the <see cref="PyBuffer.ReadOnly"/> field. If set, the exporter MUST provide a writable buffer or else report failure. Otherwise, the exporter MAY provide either a read-only or writable buffer, but the choice MUST be consistent for all consumers.
/// </summary>
WRITABLE = 0x0001,
/// <summary>
/// Controls the <see cref="PyBuffer.Format"/> field. If set, this field MUST be filled in correctly. Otherwise, this field MUST be NULL.
/// </summary>
FORMATS = 0x0004,
/// <summary>
/// N-Dimensional buffer with shape
/// </summary>
ND = 0x0008,
/// <summary>
/// Buffer with strides and shape
/// </summary>
STRIDES = (0x0010 | ND),
/// <summary>
/// C-Contigous buffer with strides and shape
/// </summary>
C_CONTIGUOUS = (0x0020 | STRIDES),
/// <summary>
/// F-Contigous buffer with strides and shape
/// </summary>
F_CONTIGUOUS = (0x0040 | STRIDES),
/// <summary>
/// C or Fortran contigous buffer with strides and shape
/// </summary>
ANY_CONTIGUOUS = (0x0080 | STRIDES),
/// <summary>
/// Buffer with suboffsets (if needed)
/// </summary>
INDIRECT = (0x0100 | STRIDES),
/// <summary>
/// Writable C-Contigous buffer with shape
/// </summary>
CONTIG = (ND | WRITABLE),
/// <summary>
/// Readonly C-Contigous buffer with shape
/// </summary>
CONTIG_RO = (ND),
/// <summary>
/// Writable buffer with shape and strides
/// </summary>
STRIDED = (STRIDES | WRITABLE),
/// <summary>
/// Readonly buffer with shape and strides
/// </summary>
STRIDED_RO = (STRIDES),
/// <summary>
/// Writable buffer with shape, strides and format
/// </summary>
RECORDS = (STRIDES | WRITABLE | FORMATS),
/// <summary>
/// Readonly buffer with shape, strides and format
/// </summary>
RECORDS_RO = (STRIDES | FORMATS),
/// <summary>
/// Writable indirect buffer with shape, strides, format and suboffsets (if needed)
/// </summary>
FULL = (INDIRECT | WRITABLE | FORMATS),
/// <summary>
/// Readonly indirect buffer with shape, strides, format and suboffsets (if needed)
/// </summary>
FULL_RO = (INDIRECT | FORMATS),
}
internal struct PyBufferProcs
{
public IntPtr Get;
public IntPtr Release;
}
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate int GetBufferProc(BorrowedReference obj, out Py_buffer buffer, PyBUF flags);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate void ReleaseBufferProc(BorrowedReference obj, ref Py_buffer buffer);
}