Spanify PngBuilder

src/UglyToad.PdfPig/IO/StreamWrapper.cs

@@ -1,5 +1,6 @@
 namespace UglyToad.PdfPig.IO
 {
+    using System;
     using System.IO;
 
     internal class StreamWrapper : Stream
@@ -36,6 +37,13 @@
             Stream.Write(buffer, offset, count);
         }
 
+#if NET6_0_OR_GREATER
+        public override void Write(ReadOnlySpan<byte> buffer)
+        {
+            Stream.Write(buffer);
+        }
+#endif
+
         public override bool CanRead => Stream.CanRead;
 
         public override bool CanSeek => Stream.CanSeek;

src/UglyToad.PdfPig/Images/Png/HeaderValidationResult.cs

@@ -1,8 +1,10 @@
 namespace UglyToad.PdfPig.Images.Png
 {
+    using System;
+
     internal readonly struct HeaderValidationResult
     {
-        public static readonly byte[] ExpectedHeader = {
+        public static ReadOnlySpan<byte> ExpectedHeader => [
             137,
             80,
             78,
@@ -11,7 +13,7 @@
             10,
             26,
             10
-        };
+        ];
 
         public int Byte1 { get; }
 

src/UglyToad.PdfPig/Images/Png/ImageHeader.cs

@@ -8,9 +8,9 @@
     /// </summary>
     internal readonly struct ImageHeader
     {
-        internal static readonly byte[] HeaderBytes = {
+        internal static ReadOnlySpan<byte> HeaderBytes => [
             73, 72, 68, 82
-        };
+        ];
 
         private static readonly IReadOnlyDictionary<ColorType, HashSet<byte>> PermittedBitDepths = new Dictionary<ColorType, HashSet<byte>>
         {

src/UglyToad.PdfPig/Images/Png/PngBuilder.cs

@@ -80,7 +80,7 @@
         /// </summary>
         public void Save(Stream outputStream)
         {
-            outputStream.Write(HeaderValidationResult.ExpectedHeader, 0, HeaderValidationResult.ExpectedHeader.Length);
+            outputStream.Write(HeaderValidationResult.ExpectedHeader);
 
             var stream = new PngStreamWriteHelper(outputStream);
 
@@ -106,12 +106,12 @@
 
             var imageData = Compress(rawData);
             stream.WriteChunkLength(imageData.Length);
-            stream.WriteChunkHeader("IDAT"u8.ToArray());
+            stream.WriteChunkHeader("IDAT"u8);
-            stream.Write(imageData, 0, imageData.Length);
+            stream.Write(imageData);
             stream.WriteCrc();
 
             stream.WriteChunkLength(0);
-            stream.WriteChunkHeader("IEND"u8.ToArray());
+            stream.WriteChunkHeader("IEND"u8);
             stream.WriteCrc();
         }
 

src/UglyToad.PdfPig/Images/Png/PngStreamWriteHelper.cs

@@ -31,10 +31,10 @@
 
         public override void Flush() => inner.Flush();
 
-        public void WriteChunkHeader(byte[] header)
+        public void WriteChunkHeader(ReadOnlySpan<byte> header)
         {
             written.Clear();
-            Write(header, 0, header.Length);
+            Write(header);
         }
 
         public void WriteChunkLength(int length)
@@ -54,6 +54,20 @@
             inner.Write(buffer, offset, count);
         }
 
+#if NET8_0_OR_GREATER
+        public override void Write(ReadOnlySpan<byte> buffer)
+        {
+            written.AddRange(buffer);
+            inner.Write(buffer);
+        }
+#else
+        public void Write(ReadOnlySpan<byte> buffer)
+        {
+            written.AddRange(buffer.ToArray());
+            inner.Write(buffer);
+        }
+#endif
+
         public void WriteCrc()
         {
             var result = (int)Crc32.Calculate(written);