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Use ReadOnlyMemory<byte> for binary data to eliminate UTF-16 transcoding (#1070)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: ericstj <8918108+ericstj@users.noreply.github.com>
Co-authored-by: Eric StJohn <ericstj@microsoft.com>
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Copilot 2026-02-19 14:08:05 -08:00 • committed by GitHub
commit 80b1ad21d7
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1 changed files with 400 additions and 103 deletions
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10
src/ModelContextProtocol.Core/Server/AIFunctionMcpServerResource.cs
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@ -7,6 +7,7 @@ using System.Diagnostics;
using System.Globalization;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
@ -391,7 +392,12 @@ internal sealed class AIFunctionMcpServerResource : McpServerResource
DataContent dc => new()
{
Contents = [new BlobResourceContents { Uri = request.Params!.Uri, MimeType = dc.MediaType, Blob = dc.Base64Data.ToString() }],
Contents = [new BlobResourceContents
{
Uri = request.Params!.Uri,
MimeType = dc.MediaType,
Blob = EncodingUtilities.GetUtf8Bytes(dc.Base64Data.Span)
}],
},
string text => new()
@ -420,7 +426,7 @@ internal sealed class AIFunctionMcpServerResource : McpServerResource
{
Uri = request.Params!.Uri,
MimeType = dc.MediaType,
Blob = dc.Base64Data.ToString()
Blob = EncodingUtilities.GetUtf8Bytes(dc.Base64Data.Span)
},
_ => throw new InvalidOperationException($"Unsupported AIContent type '{ac.GetType()}' returned from resource function."),