From 3984253ac58e0cca1c0b94fad1549dd4e0e3c2e1 Mon Sep 17 00:00:00 2001
From: Markus Goetz <Markus.Goetz@nokia.com>
Date: Thu, 25 Jun 2009 16:52:45 +0200
Subject: QNAM HTTP Code: Prepare for download performance improvements

Change the QByteArray to a QRingBuffer to save re-allocation time.

Reviewed-by: Thiago Macieira <thiago.macieira@nokia.com>
---
 src/network/access/qhttpnetworkconnection.cpp | 20 +++++++++++++-------
 src/network/access/qhttpnetworkconnection_p.h |  1 +
 src/network/access/qhttpnetworkreply.cpp      |  9 +++++++++
 src/network/access/qhttpnetworkreply_p.h      |  6 ++++--
 4 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/src/network/access/qhttpnetworkconnection.cpp b/src/network/access/qhttpnetworkconnection.cpp
index 365ae8b..8409660 100644
--- a/src/network/access/qhttpnetworkconnection.cpp
+++ b/src/network/access/qhttpnetworkconnection.cpp
@@ -176,7 +176,8 @@ bool QHttpNetworkConnectionPrivate::isSocketReading(QAbstractSocket *socket) con
 
 void QHttpNetworkConnectionPrivate::appendUncompressedData(QHttpNetworkReply &reply, const QByteArray &fragment)
 {
-    reply.d_func()->responseData.append(fragment);
+    char *dst = reply.d_func()->responseData.reserve(fragment.size());
+    qMemCopy(dst, fragment.constData(), fragment.size());
 }
 
 void QHttpNetworkConnectionPrivate::appendCompressedData(QHttpNetworkReply &reply, const QByteArray &fragment)
@@ -189,6 +190,11 @@ qint64 QHttpNetworkConnectionPrivate::uncompressedBytesAvailable(const QHttpNetw
     return reply.d_func()->responseData.size();
 }
 
+qint64 QHttpNetworkConnectionPrivate::uncompressedBytesAvailableNextBlock(const QHttpNetworkReply &reply) const
+{
+    return reply.d_func()->responseData.nextDataBlockSize();
+}
+
 qint64 QHttpNetworkConnectionPrivate::compressedBytesAvailable(const QHttpNetworkReply &reply) const
 {
     return reply.d_func()->compressedData.size();
@@ -196,15 +202,15 @@ qint64 QHttpNetworkConnectionPrivate::compressedBytesAvailable(const QHttpNetwor
 
 qint64 QHttpNetworkConnectionPrivate::read(QHttpNetworkReply &reply, QByteArray &data, qint64 maxSize)
 {
-    QByteArray *ba = &reply.d_func()->responseData;
-    if (maxSize == -1 || maxSize >= ba->size()) {
+    QRingBuffer *rb = &reply.d_func()->responseData;
+    if (maxSize == -1 || maxSize >= rb->size()) {
         // read the whole data
-        data = *ba;
-        ba->clear();
+        data = rb->readAll();
+        rb->clear();
     } else {
         // read only the requested length
-        data = ba->mid(0, maxSize);
-        ba->remove(0, maxSize);
+        data.resize(maxSize);
+        rb->read(data.data(), maxSize);
     }
     return data.size();
 }
diff --git a/src/network/access/qhttpnetworkconnection_p.h b/src/network/access/qhttpnetworkconnection_p.h
index bc4d948..3eb8ffe 100644
--- a/src/network/access/qhttpnetworkconnection_p.h
+++ b/src/network/access/qhttpnetworkconnection_p.h
@@ -258,6 +258,7 @@ public:
     void appendCompressedData(QHttpNetworkReply &reply, const QByteArray &fragment);
 
     qint64 uncompressedBytesAvailable(const QHttpNetworkReply &reply) const;
+    qint64 uncompressedBytesAvailableNextBlock(const QHttpNetworkReply &reply) const;
     qint64 compressedBytesAvailable(const QHttpNetworkReply &reply) const;
 
     qint64 read(QHttpNetworkReply &reply, QByteArray &data, qint64 maxSize);
diff --git a/src/network/access/qhttpnetworkreply.cpp b/src/network/access/qhttpnetworkreply.cpp
index 47fb6d1..202bdea 100644
--- a/src/network/access/qhttpnetworkreply.cpp
+++ b/src/network/access/qhttpnetworkreply.cpp
@@ -167,6 +167,15 @@ qint64 QHttpNetworkReply::bytesAvailable() const
         return -1;
 }
 
+qint64 QHttpNetworkReply::bytesAvailableNextBlock() const
+{
+    Q_D(const QHttpNetworkReply);
+    if (d->connection)
+        return d->connection->d_func()->uncompressedBytesAvailableNextBlock(*this);
+    else
+        return -1;
+}
+
 QByteArray QHttpNetworkReply::read(qint64 maxSize)
 {
     Q_D(QHttpNetworkReply);
diff --git a/src/network/access/qhttpnetworkreply_p.h b/src/network/access/qhttpnetworkreply_p.h
index 08bd886..69c9158 100644
--- a/src/network/access/qhttpnetworkreply_p.h
+++ b/src/network/access/qhttpnetworkreply_p.h
@@ -79,6 +79,7 @@ static const unsigned char gz_magic[2] = {0x1f, 0x8b}; // gzip magic header
 #include <private/qhttpnetworkheader_p.h>
 #include <private/qhttpnetworkrequest_p.h>
 #include <private/qauthenticator_p.h>
+#include <private/qringbuffer_p.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -120,6 +121,7 @@ public:
     QString reasonPhrase() const;
 
     qint64 bytesAvailable() const;
+    qint64 bytesAvailableNextBlock() const;
     QByteArray read(qint64 maxSize = -1);
 
     bool isFinished() const;
@@ -193,7 +195,7 @@ public:
     qint64 bodyLength;
     qint64 contentRead;
     qint64 totalProgress;
-    QByteArray fragment;
+    QByteArray fragment; // used for header, status, chunk header etc, not for reply data
     qint64 currentChunkSize;
     qint64 currentChunkRead;
     QPointer<QHttpNetworkConnection> connection;
@@ -204,7 +206,7 @@ public:
 #endif
     bool autoDecompress;
 
-    QByteArray responseData; // uncompressed body
+    QRingBuffer responseData; // uncompressed body
     QByteArray compressedData; // compressed body (temporary)
     bool requestIsPrepared;
 };
-- 
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