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Reduce the number of string allocations in Utf8String when input strings do not contain a null terminator

This commit is contained in:
Anthony Konzel 2025-06-04 16:40:37 -05:00
parent 7155c09e71
commit e18e833799
1 changed files with 17 additions and 9 deletions
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26
SDL3-CS/Utf8String.cs
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@ -24,10 +24,18 @@ namespace SDL
if (str == null) if (str == null)
return new Utf8String(null); return new Utf8String(null);
if (str.EndsWith('\0')) if (str.Length == 0)
return new Utf8String("\0"u8);
if (str[^1] == '\0')
return new Utf8String(Encoding.UTF8.GetBytes(str)); return new Utf8String(Encoding.UTF8.GetBytes(str));
return new Utf8String(Encoding.UTF8.GetBytes(str + '\0')); ReadOnlySpan<char> chars = str.AsSpan();
int len = Encoding.UTF8.GetByteCount(chars);
byte[] bytes = new byte[len + 1];
Encoding.UTF8.GetBytes(chars, bytes);
return new Utf8String(bytes);
} }
public static implicit operator Utf8String(ReadOnlySpan<byte> raw) public static implicit operator Utf8String(ReadOnlySpan<byte> raw)
@ -36,14 +44,14 @@ namespace SDL
return new Utf8String(null); return new Utf8String(null);
if (raw.Length == 0) if (raw.Length == 0)
return new Utf8String(new ReadOnlySpan<byte>([0])); return new Utf8String("\0"u8);
if (raw[^1] != 0) if (raw[^1] == 0)
{ return new Utf8String(raw);
byte[] copy = new byte[raw.Length + 1];
raw.CopyTo(copy); byte[] copy = new byte[raw.Length + 1];
raw = copy; raw.CopyTo(copy);
} raw = copy;
return new Utf8String(raw); return new Utf8String(raw);
} }