// RichTextKit
// Copyright © 2019-2020 Topten Software. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this product 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.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Topten.RichTextKit.Utils;
namespace Topten.RichTextKit.Utils
{
///
/// Miscellaneous utility functions for working with UTF-32 data.
///
public static class Utf32Utils
{
///
/// Convert a slice of UTF-32 integer code points to a string
///
/// The code points to convert
/// A string
public static string FromUtf32(Slice buffer)
{
unsafe
{
fixed (int* p = buffer.Underlying)
{
var pBuf = p + buffer.Start;
return new string((sbyte*)pBuf, 0, buffer.Length * sizeof(int), Encoding.UTF32);
}
}
}
///
/// Converts a string to an integer array of UTF-32 code points
///
/// The string to convert
/// The converted code points
public static int[] ToUtf32(string str)
{
unsafe
{
fixed (char* pstr = str)
{
// Get required byte count
int byteCount = Encoding.UTF32.GetByteCount(pstr, str.Length);
System.Diagnostics.Debug.Assert((byteCount % 4) == 0);
// Allocate buffer
int[] utf32 = new int[byteCount / sizeof(int)];
fixed (int* putf32 = utf32)
{
// Convert
Encoding.UTF32.GetBytes(pstr, str.Length, (byte*)putf32, byteCount);
// Done
return utf32;
}
}
}
}
}
}