| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You 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. |
| |
| using System; |
| using System.Runtime.InteropServices; |
| |
| // Adapted from: |
| // https://github.com/G-Research/ParquetSharp/blob/467d99298fb5a5b9d5935b9c8dbde95e63954dd3/csharp/StringUtil.cs |
| |
| namespace Apache.Arrow.C |
| { |
| |
| internal static class StringUtil |
| { |
| public static unsafe byte* ToCStringUtf8(string str) |
| { |
| var utf8 = System.Text.Encoding.UTF8; |
| int byteCount = utf8.GetByteCount(str); |
| byte* byteArray = (byte*)Marshal.AllocHGlobal(byteCount + 1); |
| |
| fixed (char* chars = str) |
| { |
| utf8.GetBytes(chars, str.Length, byteArray, byteCount); |
| } |
| |
| // Need to make sure it is null-terminated. |
| byteArray[byteCount] = 0; |
| |
| return byteArray; |
| } |
| |
| public static unsafe string PtrToStringUtf8(byte* ptr) |
| { |
| #if NETSTANDARD2_1_OR_GREATER |
| return Marshal.PtrToStringUTF8(ptr); |
| #else |
| if (ptr == null) |
| { |
| return null; |
| } |
| |
| int length; |
| for (length = 0; ptr[length] != '\0'; ++length) |
| { |
| } |
| |
| return System.Text.Encoding.UTF8.GetString(ptr, length); |
| #endif |
| } |
| } |
| } |