1 files changed, 159 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/Utilities/StringUtils.cs b/src/Ryujinx.HLE/Utilities/StringUtils.cs
new file mode 100644
index 00000000..1810b1ad
--- /dev/null
+++ b/src/Ryujinx.HLE/Utilities/StringUtils.cs
@@ -0,0 +1,159 @@
+using LibHac.Common;
+using Microsoft.IO;
+using Ryujinx.Common.Memory;
+using Ryujinx.HLE.HOS;
+using System;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace Ryujinx.HLE.Utilities
+{
+    static class StringUtils
+    {
+        public static byte[] GetFixedLengthBytes(string inputString, int size, Encoding encoding)
+        {
+            inputString += "\0";
+
+            int bytesCount = encoding.GetByteCount(inputString);
+
+            byte[] output = new byte[size];
+
+            if (bytesCount < size)
+            {
+                encoding.GetBytes(inputString, 0, inputString.Length, output, 0);
+            }
+            else
+            {
+                int nullSize = encoding.GetByteCount("\0");
+
+                output = encoding.GetBytes(inputString);
+
+                Array.Resize(ref output, size - nullSize);
+
+                output = output.Concat(encoding.GetBytes("\0")).ToArray();
+            }
+
+            return output;
+        }
+
+        public static string ReadInlinedAsciiString(BinaryReader reader, int maxSize)
+        {
+            byte[] data = reader.ReadBytes(maxSize);
+
+            int stringSize = Array.IndexOf<byte>(data, 0);
+
+            return Encoding.ASCII.GetString(data, 0, stringSize < 0 ? maxSize : stringSize);
+        }
+
+        public static byte[] HexToBytes(string hexString)
+        {
+            // Ignore last character if HexLength % 2 != 0.
+            int bytesInHex = hexString.Length / 2;
+
+            byte[] output = new byte[bytesInHex];
+
+            for (int index = 0; index < bytesInHex; index++)
+            {
+                output[index] = byte.Parse(hexString.AsSpan(index * 2, 2), NumberStyles.HexNumber);
+            }
+
+            return output;
+        }
+
+        public static string ReadUtf8String(ReadOnlySpan<byte> data, out int dataRead)
+        {
+            dataRead = data.IndexOf((byte)0) + 1;
+
+            if (dataRead <= 1)
+            {
+                return string.Empty;
+            }
+
+            return Encoding.UTF8.GetString(data[..dataRead]);
+        }
+
+        public static string ReadUtf8String(ServiceCtx context, int index = 0)
+        {
+            ulong position = context.Request.PtrBuff[index].Position;
+            ulong size     = context.Request.PtrBuff[index].Size;
+
+            using (RecyclableMemoryStream ms = MemoryStreamManager.Shared.GetStream())
+            {
+                while (size-- > 0)
+                {
+                    byte value = context.Memory.Read<byte>(position++);
+
+                    if (value == 0)
+                    {
+                        break;
+                    }
+
+                    ms.WriteByte(value);
+                }
+
+                return Encoding.UTF8.GetString(ms.GetReadOnlySequence());
+            }
+        }
+
+        public static U8Span ReadUtf8Span(ServiceCtx context, int index = 0)
+        {
+            ulong position = context.Request.PtrBuff[index].Position;
+            ulong size     = context.Request.PtrBuff[index].Size;
+
+            ReadOnlySpan<byte> buffer = context.Memory.GetSpan(position, (int)size);
+
+            return new U8Span(buffer);
+        }
+
+        public static string ReadUtf8StringSend(ServiceCtx context, int index = 0)
+        {
+            ulong position = context.Request.SendBuff[index].Position;
+            ulong size     = context.Request.SendBuff[index].Size;
+
+            using (RecyclableMemoryStream ms = MemoryStreamManager.Shared.GetStream())
+            {
+                while (size-- > 0)
+                {
+                    byte value = context.Memory.Read<byte>(position++);
+
+                    if (value == 0)
+                    {
+                        break;
+                    }
+
+                    ms.WriteByte(value);
+                }
+
+                return Encoding.UTF8.GetString(ms.GetReadOnlySequence());
+            }
+        }
+
+        public static int CompareCStr(ReadOnlySpan<byte> s1, ReadOnlySpan<byte> s2)
+        {
+            int s1Index = 0;
+            int s2Index = 0;
+
+            while (s1[s1Index] != 0 && s2[s2Index] != 0 && s1[s1Index] == s2[s2Index])
+            {
+                s1Index += 1;
+                s2Index += 1;
+            }
+
+            return s2[s2Index] - s1[s1Index];
+        }
+
+        public static int LengthCstr(ReadOnlySpan<byte> s)
+        {
+            int i = 0;
+
+            while (s[i] != 0)
+            {
+                i++;
+            }
+
+            return i;
+        }
+    }
+}
+\ No newline at end of file