72 lines
2.3 KiB
C#
72 lines
2.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Unity.Burst
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{
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#if BURST_COMPILER_SHARED
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public static class SafeStringArrayHelper
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#else
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internal static class SafeStringArrayHelper
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#endif
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{
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// Methods to help when needing to serialise arrays of strings safely
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public static string SerialiseStringArraySafe(string[] array)
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{
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var s = new StringBuilder();
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foreach (var entry in array)
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{
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s.Append($"{Encoding.UTF8.GetByteCount(entry)}]");
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s.Append(entry);
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}
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return s.ToString();
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}
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public static string[] DeserialiseStringArraySafe(string input)
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{
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// Safer method of serialisation (len]path) e.g. "5]frank8]c:\\billy" ( new [] {"frank","c:\\billy"} )
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// Since the len part of `len]path` is specified in bytes we'll be working on a byte array instead
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// of a string, because functions like Substring expects char offsets and number of chars.
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var bytes = Encoding.UTF8.GetBytes(input);
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var listFolders = new List<string>();
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var index = 0;
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var length = bytes.Length;
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while (index < length)
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{
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int len = 0;
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// Read the decimal encoded length, terminated by an ']'
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while (true)
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{
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if (index >= length)
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{
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throw new FormatException($"Invalid input `{input}`: reached end while reading length");
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}
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var d = bytes[index];
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if (d == ']')
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{
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index++;
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break;
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}
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if (d < '0' || d > '9')
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{
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throw new FormatException(
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$"Invalid input `{input}` at {index}: Got non-digit character while reading length");
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}
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len = len * 10 + (d - '0');
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index++;
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}
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listFolders.Add(Encoding.UTF8.GetString(bytes, index, len));
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index += len;
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}
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return listFolders.ToArray();
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}
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}
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}
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