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Eliminate allocations in TokenWriter.WriteName

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This commit is contained in:
Jason Nelson 2024-04-18 23:25:53 -07:00
parent 5acf1116f1
commit af776d50dd
1 changed files with 10 additions and 8 deletions
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18
src/UglyToad.PdfPig/Writer/TokenWriter.cs
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@ -3,6 +3,7 @@
using Core;
using Graphics.Operations;
using System;
using System.Buffers;
using System.Buffers.Text;
using System.Collections.Generic;
using System.Globalization;
@ -425,26 +426,27 @@
* This is recommended for characters whose codes are outside the range 33 (!) to 126 (~).
*/
var sb = new StringBuilder();
using var sb = new ArrayPoolBufferWriter<byte>((name.Length * 2) + 1);
Span<byte> hexBuffer = stackalloc byte[2];
foreach (var c in name)
{
if (c < 33 || c > 126 || DelimiterChars.Contains(c))
{
var str = Hex.GetString([(byte)c]);
sb.Append('#');
sb.Append(str);
Hex.GetUtf8Chars([(byte)c], hexBuffer);
sb.Write((byte)'#');
sb.Write(hexBuffer);
}
else
{
sb.Append(c);
sb.Write((byte)c); // between 33 and 126 (ASCII is 0 - 128)
}
}
var bytes = OtherEncodings.StringAsLatin1Bytes(sb.ToString());
outputStream.WriteByte(NameStart);
outputStream.Write(bytes);
outputStream.Write(sb.WrittenSpan);
WriteWhitespace(outputStream);
}