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* Avoid allocations in .Parse methods Use the Span overloads of the Parse methods when possible to avoid string allocations and remove one unnecessarry array allocation * Avoid another string allocation
157 lines
4.3 KiB
C#
157 lines
4.3 KiB
C#
using LibHac.Common;
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using Ryujinx.HLE.HOS;
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using System;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace Ryujinx.HLE.Utilities
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{
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static class StringUtils
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{
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public static byte[] GetFixedLengthBytes(string inputString, int size, Encoding encoding)
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{
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inputString += "\0";
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int bytesCount = encoding.GetByteCount(inputString);
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byte[] output = new byte[size];
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if (bytesCount < size)
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{
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encoding.GetBytes(inputString, 0, inputString.Length, output, 0);
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}
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else
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{
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int nullSize = encoding.GetByteCount("\0");
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output = encoding.GetBytes(inputString);
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Array.Resize(ref output, size - nullSize);
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output = output.Concat(encoding.GetBytes("\0")).ToArray();
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}
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return output;
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}
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public static string ReadInlinedAsciiString(BinaryReader reader, int maxSize)
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{
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byte[] data = reader.ReadBytes(maxSize);
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int stringSize = Array.IndexOf<byte>(data, 0);
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return Encoding.ASCII.GetString(data, 0, stringSize < 0 ? maxSize : stringSize);
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}
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public static byte[] HexToBytes(string hexString)
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{
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// Ignore last character if HexLength % 2 != 0.
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int bytesInHex = hexString.Length / 2;
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byte[] output = new byte[bytesInHex];
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for (int index = 0; index < bytesInHex; index++)
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{
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output[index] = byte.Parse(hexString.AsSpan(index * 2, 2), NumberStyles.HexNumber);
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}
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return output;
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}
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public static string ReadUtf8String(ReadOnlySpan<byte> data, out int dataRead)
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{
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dataRead = data.IndexOf((byte)0) + 1;
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if (dataRead <= 1)
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{
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return string.Empty;
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}
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return Encoding.UTF8.GetString(data[..dataRead]);
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}
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public static string ReadUtf8String(ServiceCtx context, int index = 0)
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{
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ulong position = context.Request.PtrBuff[index].Position;
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ulong size = context.Request.PtrBuff[index].Size;
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using (MemoryStream ms = new MemoryStream())
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{
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while (size-- > 0)
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{
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byte value = context.Memory.Read<byte>(position++);
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if (value == 0)
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{
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break;
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}
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ms.WriteByte(value);
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}
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return Encoding.UTF8.GetString(ms.ToArray());
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}
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}
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public static U8Span ReadUtf8Span(ServiceCtx context, int index = 0)
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{
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ulong position = context.Request.PtrBuff[index].Position;
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ulong size = context.Request.PtrBuff[index].Size;
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ReadOnlySpan<byte> buffer = context.Memory.GetSpan(position, (int)size);
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return new U8Span(buffer);
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}
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public static string ReadUtf8StringSend(ServiceCtx context, int index = 0)
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{
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ulong position = context.Request.SendBuff[index].Position;
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ulong size = context.Request.SendBuff[index].Size;
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using (MemoryStream ms = new MemoryStream())
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{
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while (size-- > 0)
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{
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byte value = context.Memory.Read<byte>(position++);
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if (value == 0)
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{
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break;
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}
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ms.WriteByte(value);
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}
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return Encoding.UTF8.GetString(ms.ToArray());
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}
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}
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public static int CompareCStr(ReadOnlySpan<byte> s1, ReadOnlySpan<byte> s2)
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{
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int s1Index = 0;
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int s2Index = 0;
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while (s1[s1Index] != 0 && s2[s2Index] != 0 && s1[s1Index] == s2[s2Index])
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{
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s1Index += 1;
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s2Index += 1;
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}
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return s2[s2Index] - s1[s1Index];
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}
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public static int LengthCstr(ReadOnlySpan<byte> s)
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{
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int i = 0;
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while (s[i] != 0)
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{
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i++;
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}
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return i;
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}
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}
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} |