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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Text;
namespace System.Net.Http.HPack
{
internal readonly struct HeaderField
{
// http://httpwg.org/specs/rfc7541.html#rfc.section.4.1
public const int RfcOverhead = 32;
public HeaderField(int? staticTableIndex, ReadOnlySpan<byte> name, ReadOnlySpan<byte> value)
{
// Store the static table index (if there is one) for the header field.
// ASP.NET Core has a fast path that sets a header value using the static table index instead of the name.
StaticTableIndex = staticTableIndex;
Debug.Assert(name.Length > 0);
// TODO: We're allocating here on every new table entry.
// That means a poorly-behaved server could cause us to allocate repeatedly.
// We should revisit our allocation strategy here so we don't need to allocate per entry
// and we have a cap to how much allocation can happen per dynamic table
// (without limiting the number of table entries a server can provide within the table size limit).
Name = name.ToArray();
Value = value.ToArray();
}
public int? StaticTableIndex { get; }
public byte[] Name { get; }
public byte[] Value { get; }
public int Length => GetLength(Name.Length, Value.Length);
public static int GetLength(int nameLength, int valueLength) => nameLength + valueLength + RfcOverhead;
public override string ToString()
{
if (Name != null)
{
return Encoding.Latin1.GetString(Name) + ": " + Encoding.Latin1.GetString(Value);
}
else
{
return "<empty>";
}
}
}
}
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