4.18.1.1700
52%

Ran 04 Oct 2026 12:07PM UTC

Jobs 1

Files 176

Run time 1min

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Committed 04 Oct 2026 12:02PM UTC coverage: 51.781% (-41.4%) from 93.144%

Build # 4.18.1.1700

Build Type

push

coveralls.net

Committed by

jstedfast

Commit Message

Use MimeKit's ParseUtils.EndOfLine() in ImapStream/Pop3Stream TryReadLine()

Replaced the byte-by-byte '\n' scan in ImapStream.TryReadLine() and
Pop3Stream.TryReadLine() (and the associated "use SIMD" FIXME comments)
with MimeKit's internal ParseUtils.EndOfLine() helper.

On .NET 6+, EndOfLine() uses the vectorized Span<byte>.IndexOf(). On
older frameworks it uses a 4-byte-at-a-time bit-twiddling scan, which
benchmarks showed to be faster than Span<byte>.IndexOf() from
System.Memory for typical short IMAP/POP3 response lines (Span.IndexOf
was 1.6-2.2x slower than the old loop for 16-32 byte lines on .NET
Framework 4.8, while EndOfLine was 0.7-0.8x).

Benchmark (4K buffer, ratio vs. old pointer loop, lower is better):

  Line length   .NET 10   .NET Framework 4.8
  16            ~1.0      0.83
  32            0.78      0.69
  80            0.30      0.39
  256           0.12      0.54
  1024          0.05      0.36

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Coverage Stats

13547 of 26162 relevant lines covered (51.78%)

0.52 hits per line

Coverage Regressions

Lines	Coverage	∆	File
1975	2.95	-92.42%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapFolderFetch.cs
1953	0.29	-94.76%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapFolder.cs
1427	29.26	-65.85%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapEngine.cs
947	0.0	-94.61%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapFolderSearch.cs
809	22.9	-73.21%	D/a/MailKit/MailKit/MailKit/Net/Pop3/Pop3Client.cs
675	24.05	-71.2%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapClient.cs
319	3.5	-74.53%	D/a/MailKit/MailKit/MailKit/MailFolder.cs
306	0.0	-91.34%	D/a/MailKit/MailKit/MailKit/IMailFolderStoreExtensions.cs
274	24.55	-70.08%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapCommand.cs
267	79.22	-16.87%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapUtils.cs
259	15.2	-75.73%	D/a/MailKit/MailKit/MailKit/Net/Pop3/Pop3Engine.cs
257	0.0	-98.85%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapFolderFlags.cs
236	29.35	-64.13%	D/a/MailKit/MailKit/MailKit/Net/Pop3/AsyncPop3Client.cs
223	23.15	-71.7%	D/a/MailKit/MailKit/MailKit/Net/Imap/AsyncImapClient.cs
194	0.0	-100.0%	D/a/MailKit/MailKit/MailKit/IMailFolderAppendExtensions.cs
138	0.0	-95.83%	D/a/MailKit/MailKit/MailKit/IMailFolderFetchExtensions.cs
112	0.0	-95.73%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapFolderAnnotations.cs
81	76.65	-18.43%	D/a/MailKit/MailKit/MailKit/Net/Pop3/Pop3Stream.cs
55	79.32	-20.68%	D/a/MailKit/MailKit/MailKit/Search/SearchQuery.cs
49	86.61	-7.11%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapStream.cs
47	0.0	-95.92%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapLiteral.cs
36	75.51	-24.49%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapEventGroup.cs
23	55.71	-32.86%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapCommandException.cs
23	0.0	-92.0%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapIdleContext.cs
19	12.5	-79.17%	D/a/MailKit/MailKit/MailKit/MailStore.cs
18	0.0	-94.74%	D/a/MailKit/MailKit/MailKit/Net/Pop3/Pop3Command.cs
13	91.31	-2.9%	D/a/MailKit/MailKit/MailKit/UniqueIdSet.cs
12	86.36	-10.91%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapToken.cs
11	85.87	-11.96%	D/a/MailKit/MailKit/MailKit/ByteArrayBuilder.cs
10	52.38	-47.62%	D/a/MailKit/MailKit/MailKit/StoreFlagsRequest.cs
8	52.94	-47.06%	D/a/MailKit/MailKit/MailKit/Search/BinarySearchQuery.cs
8	0.0	-100.0%	D/a/MailKit/MailKit/MailKit/Search/SearchResults.cs
6	46.15	-46.15%	D/a/MailKit/MailKit/MailKit/Search/UnarySearchQuery.cs
5	16.67	-83.33%	D/a/MailKit/MailKit/MailKit/MetadataCollection.cs
5	0.0	-100.0%	D/a/MailKit/MailKit/MailKit/Net/Pop3/Pop3Language.cs
5	85.71	-11.9%	D/a/MailKit/MailKit/MailKit/UniqueIdMap.cs
4	0.0	-100.0%	D/a/MailKit/MailKit/MailKit/FolderQuota.cs
4	66.67	-33.33%	D/a/MailKit/MailKit/MailKit/Search/AnnotationSearchQuery.cs
4	0.0	-100.0%	D/a/MailKit/MailKit/MailKit/Search/DateSearchQuery.cs
3	94.92	-5.08%	D/a/MailKit/MailKit/MailKit/FolderNamespaceCollection.cs
3	95.41	-2.75%	D/a/MailKit/MailKit/MailKit/HeaderSet.cs
3	50.0	-50.0%	D/a/MailKit/MailKit/MailKit/MailSpool.cs
3	94.52	-4.11%	D/a/MailKit/MailKit/MailKit/ProgressStream.cs
3	72.73	-27.27%	D/a/MailKit/MailKit/MailKit/Search/HeaderSearchQuery.cs
3	66.67	-33.33%	D/a/MailKit/MailKit/MailKit/Security/AuthenticationException.cs
3	75.0	-25.0%	D/a/MailKit/MailKit/MailKit/StoreLabelsRequest.cs
2	66.67	-33.33%	D/a/MailKit/MailKit/MailKit/FolderCreatedEventArgs.cs
2	92.86	-1.43%	D/a/MailKit/MailKit/MailKit/MessageSummary.cs
2	77.78	-22.22%	D/a/MailKit/MailKit/MailKit/MetadataOptions.cs
1	93.71	-0.7%	D/a/MailKit/MailKit/MailKit/MailService.cs
1	97.22	-2.78%	D/a/MailKit/MailKit/MailKit/Net/Imap/ImapSearchQueryOptimizer.cs
1	84.62	-0.59%	D/a/MailKit/MailKit/MailKit/Net/NetworkStream.cs
1	98.32	-0.84%	D/a/MailKit/MailKit/MailKit/UniqueIdRange.cs

Jobs

ID	Job ID	Ran	Files	Coverage
1	4.18.1.1700.1	04 Oct 2026 12:07PM UTC	176	51.78

jstedfast / MailKit / 4.18.1.1700
52%

README BADGES
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Markdown

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HTML

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Coverage Regressions

Jobs

Source Files on build 4.18.1.1700

jstedfast / MailKit / 4.18.1.1700 52%

README BADGES x

Markdown

Textile

RDoc

HTML

Rst

Coverage Regressions

Jobs

Source Files on build 4.18.1.1700

jstedfast / MailKit / 4.18.1.1700
52%

README BADGES
x