/*
* Copyright 2019 by its authors. See AUTHORS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma warning disable 1591
using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Diagnostics.Contracts;
namespace Eina
{
///
/// Basic interface for both slice types.
/// Since EFL 1.23.
///
public interface ISliceBase
{
///
/// The length of this slice in bytes.
/// Since EFL 1.23.
///
UIntPtr Len {get;set;}
///
/// The contents of this slice.
/// Since EFL 1.23.
///
IntPtr Mem {get;set;}
///
/// The length in bytes as an integer.
/// Since EFL 1.23.
///
int Length {get;set;}
};
/// Pointer to a slice of native memory.
///
/// Since EFL 1.23.
///
[StructLayout(LayoutKind.Sequential)]
public struct Slice : ISliceBase, IEquatable
{
///
/// The length of this slice.
/// Since EFL 1.23.
///
public UIntPtr Len {get;set;}
///
/// The contents of this slice.
/// Since EFL 1.23.
///
public IntPtr Mem {get;set;}
///
/// The length as an integer.
/// Since EFL 1.23.
///
public int Length
{
get { return (int)Len; }
set { Len = (UIntPtr)value; }
}
///
/// Creates a new slice from the given memory and length.
/// Since EFL 1.23.
///
/// The memory slice.
/// The length.
public Slice(IntPtr mem, UIntPtr len)
{
Mem = mem;
Len = len;
}
///
/// Gets a hash for .
/// Since EFL 1.24.
///
/// A hash code.
public override int GetHashCode() => Length.GetHashCode() ^ Mem.GetHashCode();
/// Returns whether this
/// is equal to the given .
/// Since EFL 1.24.
///
/// The to be compared to.
/// true if is equal to other.
public override bool Equals(object other)
=> (!(other is Slice)) ? false : Equals((Slice)other);
/// Returns whether this is equal
/// to the given .
/// Since EFL 1.24.
///
/// The to be compared to.
/// true if is equal to other.
public bool Equals(Slice other)
=> (Length == other.Length) ^ (Mem == other.Mem);
/// Returns whether lhs is equal to rhs.
/// Since EFL 1.24.
///
/// The left hand side of the operator.
/// The right hand side of the operator.
/// true if lhs is equal
/// to rhs.
public static bool operator==(Slice lhs, Slice rhs) => lhs.Equals(rhs);
/// Returns whether lhs is not equal to rhs.
/// Since EFL 1.24.
///
/// The left hand side of the operator.
/// The right hand side of the operator.
/// true if lhs is not equal
/// to rhs.
public static bool operator!=(Slice lhs, Slice rhs) => !(lhs == rhs);
}
/// Pointer to a slice of native memory.
///
/// Since EFL 1.23.
///
[StructLayout(LayoutKind.Sequential)]
public struct RwSlice : ISliceBase, IEquatable
{
///
/// The length of this slice.
/// Since EFL 1.23.
///
public UIntPtr Len {get;set;}
///
/// The contents of this slice.
/// Since EFL 1.23.
///
public IntPtr Mem {get;set;}
///
/// The length as an integer.
/// Since EFL 1.23.
///
public int Length
{
get { return (int)Len; }
set { Len = (UIntPtr)value; }
}
///
/// Creates a new slice from the given memory and length.
/// Since EFL 1.23.
///
/// The memory slice.
/// The length.
public RwSlice(IntPtr mem, UIntPtr len)
{
Mem = mem;
Len = len;
}
///
/// Returns a read-only slice from this writable memory.
/// Since EFL 1.23.
///
Slice ToSlice()
{
var r = new Slice();
r.Mem = Mem;
r.Len = Len;
return r;
}
///
/// Gets a hash for .
/// Since EFL 1.24.
///
/// A hash code.
public override int GetHashCode() => Mem.GetHashCode() ^ Length.GetHashCode();
/// Returns whether this
/// is equal to the given .
/// Since EFL 1.24.
///
/// The to be compared to.
/// true if is equal to other.
public override bool Equals(object other)
=> (!(other is RwSlice)) ? false : Equals((RwSlice)other);
/// Returns whether this is equal
/// to the given .
/// Since EFL 1.24.
///
/// The to be compared to.
/// true if is equal to other.
public bool Equals(RwSlice other)
=> (Length == other.Length) && (Mem == other.Mem);
/// Returns whether lhs is equal to rhs.
/// Since EFL 1.24.
///
/// The left hand side of the operator.
/// The right hand side of the operator.
/// true if lhs is equal
/// to rhs.
public static bool operator==(RwSlice lhs, RwSlice rhs) => lhs.Equals(rhs);
/// Returns whether lhs is not equal to rhs.
/// Since EFL 1.24.
///
/// The left hand side of the operator.
/// The right hand side of the operator.
/// true if lhs is not equal
/// to rhs.
public static bool operator!=(RwSlice lhs, RwSlice rhs) => !(lhs == rhs);
}
}
namespace Eina
{
public static class SliceExtensions
{
public static byte[] GetBytes(this Eina.ISliceBase slc)
{
Contract.Requires(slc != null, nameof(slc));
var size = (int)(slc.Len);
byte[] mArray = new byte[size];
Marshal.Copy(slc.Mem, mArray, 0, size);
return mArray;
}
}
}