61 lines
1.9 KiB
Diff
61 lines
1.9 KiB
Diff
From 89357c7b0fc5e76091510af504058c036fa1b2f9 Mon Sep 17 00:00:00 2001
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From: Milian Wolff <mail@milianw.de>
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Date: Wed, 10 Dec 2014 21:04:24 +0100
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Subject: [PATCH 29/30] Reduce the amount of allocations by preallocating a
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buffer.
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Sadly, QByteArray cannot be cleared without destroying the buffer.
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But we can guesstimate the target size of the buffer and thus
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reduce the amount of allocations.
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This also adds a benchmark for ImapParser::parseString.
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---
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libs/imapparser.cpp | 1 +
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libs/tests/imapparserbenchmark.cpp | 19 +++++++++++++++++++
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2 files changed, 20 insertions(+)
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diff --git a/libs/imapparser.cpp b/libs/imapparser.cpp
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index 6f9f592..f3301e7 100644
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--- a/libs/imapparser.cpp
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+++ b/libs/imapparser.cpp
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@@ -186,6 +186,7 @@ int ImapParser::parseQuotedString( const QByteArray &data, QByteArray &result, i
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// quoted string
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if ( data[begin] == '"' ) {
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++begin;
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+ result.reserve(qMin(32, data.size() - begin));
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for ( int i = begin; i < data.length(); ++i ) {
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const char ch = data.at( i );
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if ( foundSlash ) {
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diff --git a/libs/tests/imapparserbenchmark.cpp b/libs/tests/imapparserbenchmark.cpp
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index fd4335c..ee861a0 100644
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--- a/libs/tests/imapparserbenchmark.cpp
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+++ b/libs/tests/imapparserbenchmark.cpp
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@@ -95,6 +95,25 @@ class ImapParserBenchmark : public QObject
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}
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}
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+ void parseString_data()
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+ {
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+ QTest::addColumn<QByteArray>( "data" );
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+ QTest::newRow("plain") << QByteArray("fooobarasdf something more lalala");
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+ QTest::newRow("quoted") << QByteArray("\"fooobarasdf\" something more lalala");
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+ }
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+
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+ void parseString()
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+ {
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+ QFETCH(QByteArray, data);
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+ QByteArray result;
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+ qint64 sum = 0;
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+ QBENCHMARK {
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+ sum += ImapParser::parseString( data, result );
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+ }
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+ QVERIFY(!result.isEmpty());
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+ QVERIFY(sum > 0);
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+ }
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+
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void parseNumber()
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{
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QByteArray data( "123456" );
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--
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2.1.0
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