73 lines
2.0 KiB
C#
73 lines
2.0 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace ImGuiNET
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{
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internal static unsafe class Util
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{
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internal const int StackAllocationSizeLimit = 2048;
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public static string StringFromPtr(byte* ptr)
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{
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int characters = 0;
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while (ptr[characters] != 0)
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{
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characters++;
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}
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return Encoding.UTF8.GetString(ptr, characters);
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}
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internal static bool AreStringsEqual(byte* a, int aLength, byte* b)
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{
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for (int i = 0; i < aLength; i++)
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{
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if (a[i] != b[i]) { return false; }
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}
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if (b[aLength] != 0) { return false; }
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return true;
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}
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internal static byte* Allocate(int byteCount) => (byte*)Marshal.AllocHGlobal(byteCount);
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internal static void Free(byte* ptr) => Marshal.FreeHGlobal((IntPtr)ptr);
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internal static int CalcSizeInUtf8(string s, int start, int length)
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{
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if (start < 0 || length < 0 || start + length > s.Length)
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{
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throw new ArgumentOutOfRangeException();
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}
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fixed (char* utf16Ptr = s)
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{
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return Encoding.UTF8.GetByteCount(utf16Ptr + start, length);
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}
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}
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internal static int GetUtf8(string s, byte* utf8Bytes, int utf8ByteCount)
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{
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fixed (char* utf16Ptr = s)
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{
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return Encoding.UTF8.GetBytes(utf16Ptr, s.Length, utf8Bytes, utf8ByteCount);
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}
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}
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internal static int GetUtf8(string s, int start, int length, byte* utf8Bytes, int utf8ByteCount)
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{
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if (start < 0 || length < 0 || start + length > s.Length)
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{
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throw new ArgumentOutOfRangeException();
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}
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fixed (char* utf16Ptr = s)
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{
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return Encoding.UTF8.GetBytes(utf16Ptr + start, length, utf8Bytes, utf8ByteCount);
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}
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}
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}
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}
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