jstedfast / MimeKit / 4.1.0.917
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4.1.0.917

Pull #952

coveralls.net

jstedfast 
Reduced memory allocations in Rfc2047.DecodePhrase() and DecodeText()

By pushing the DecodeTokens() logic into a new interface so that decoding
can be done incrementally as we tokenize the phrase/text, we can avoid
allocating a List<Token> (and all of the tokens that goes with it) which
can drastically reduce GC pressure, especially when calling MailKit's
ImapFolder.Fetch/Async() methods with MessageSummaryItems.Envelope.

(IMAP FETCH responses including ENVELOPE metadata require decoding of
rfc2047-encoded strings, so DecodeText() and DecodePhrase() end up being
fairly performance critical - not as much as tokenization of IMAP
responses, but pretty high up there.)

This also slightly increases benchmark performance as well:

Before:

BenchmarkDotNet v0.13.7, Windows 11 (10.0.22621.2134/22H2/2022Update/SunValley2)
Intel Core i7-9700 CPU 3.00GHz, 1 CPU, 8 logical and 8 physical cores
.NET SDK 8.0.100-preview.7.23376.3
  [Host]     : .NET 6.0.21 (6.0.2123.36311), X64 RyuJIT AVX2
  DefaultJob : .NET 6.0.21 (6.0.2123.36311), X64 RyuJIT AVX2

|               Method |     Mean |     Error |    StdDev |
|--------------------- |---------:|----------:|----------:|
|   Rfc2047_DecodeText | 1.033 us | 0.0083 us | 0.0078 us |
| Rfc2047_DecodePhrase | 1.024 us | 0.0055 us | 0.0046 us |

After:

|               Method |     Mean |    Error |   StdDev |   Median |
|--------------------- |---------:|---------:|---------:|---------:|
|   Rfc2047_DecodeText | 973.0 ns | 18.20 ns | 30.41 ns | 956.5 ns |
| Rfc2047_DecodePhrase | 899.5 ns |  3.82 ns |  3.57 ns | 898.7 ns |
Pull Request #952: Reduced memory allocations in Rfc2047.DecodePhrase() and DecodeText()

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