From 35adb74ddd915831789f0175423660f8e898942e Mon Sep 17 00:00:00 2001
From: Ulf Hermann <ulf.hermann@qt.io>
Date: Wed, 19 Jun 2019 13:43:00 +0200
Subject: Reimplement JSON support on top of Cbor

In turn, deprecate the QJsonDocument methods that deal with JSON binary
data. You should use CBOR for data serialization these days.

[ChangeLog][Deprecation Notice] The binary JSON representation is
deprecated. The CBOR format should be used instead.

Fixes: QTBUG-47629
Change-Id: Ic8b92ea36de87815b12307a9d8b1095f07166db8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 src/corelib/serialization/qbinaryjsonarray.cpp | 137 +++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/corelib/serialization/qbinaryjsonarray.cpp

(limited to 'src/corelib/serialization/qbinaryjsonarray.cpp')

diff --git a/src/corelib/serialization/qbinaryjsonarray.cpp b/src/corelib/serialization/qbinaryjsonarray.cpp
new file mode 100644
index 0000000000..68937fe17d
--- /dev/null
+++ b/src/corelib/serialization/qbinaryjsonarray.cpp
@@ -0,0 +1,137 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbinaryjsonarray_p.h"
+#include "qbinaryjson_p.h"
+
+#include <qjsonarray.h>
+
+QT_BEGIN_NAMESPACE
+
+QBinaryJsonArray::~QBinaryJsonArray()
+{
+    if (d && !d->ref.deref())
+        delete d;
+}
+
+QBinaryJsonArray QBinaryJsonArray::fromJsonArray(const QJsonArray &array)
+{
+    QBinaryJsonArray binary;
+    for (const QJsonValue &value : array)
+        binary.append(QBinaryJsonValue::fromJsonValue(value));
+    if (binary.d) // We want to compact it as it is a root item now
+        binary.d->compactionCounter++;
+    binary.compact();
+    return binary;
+}
+
+void QBinaryJsonArray::append(const QBinaryJsonValue &value)
+{
+    const uint i = a ? a->length : 0;
+
+    bool compressed;
+    uint valueSize = QBinaryJsonPrivate::Value::requiredStorage(value, &compressed);
+
+    if (!detach(valueSize + sizeof(QBinaryJsonPrivate::Value)))
+        return;
+
+    if (!a->length)
+        a->tableOffset = sizeof(QBinaryJsonPrivate::Array);
+
+    uint valueOffset = a->reserveSpace(valueSize, i, 1, false);
+    if (!valueOffset)
+        return;
+
+    QBinaryJsonPrivate::Value *v = a->at(i);
+    v->type = (value.t == QJsonValue::Undefined ? QJsonValue::Null : value.t);
+    v->latinOrIntValue = compressed;
+    v->latinKey = false;
+    v->value = QBinaryJsonPrivate::Value::valueToStore(value, valueOffset);
+    if (valueSize) {
+        QBinaryJsonPrivate::Value::copyData(value, reinterpret_cast<char *>(a) + valueOffset,
+                                            compressed);
+    }
+}
+
+char *QBinaryJsonArray::takeRawData(uint *size)
+{
+    if (d)
+        return d->takeRawData(size);
+    *size = 0;
+    return nullptr;
+}
+
+bool QBinaryJsonArray::detach(uint reserve)
+{
+    if (!d) {
+        if (reserve >= QBinaryJsonPrivate::Value::MaxSize) {
+            qWarning("QBinaryJson: Document too large to store in data structure");
+            return false;
+        }
+        d = new QBinaryJsonPrivate::MutableData(reserve, QJsonValue::Array);
+        a = static_cast<QBinaryJsonPrivate::Array *>(d->header->root());
+        d->ref.ref();
+        return true;
+    }
+    if (reserve == 0 && d->ref.loadRelaxed() == 1)
+        return true;
+
+    QBinaryJsonPrivate::MutableData *x = d->clone(a, reserve);
+    if (!x)
+        return false;
+    x->ref.ref();
+    if (!d->ref.deref())
+        delete d;
+    d = x;
+    a = static_cast<QBinaryJsonPrivate::Array *>(d->header->root());
+    return true;
+}
+
+void QBinaryJsonArray::compact()
+{
+    if (!d || !d->compactionCounter)
+        return;
+
+    detach();
+    d->compact();
+    a = static_cast<QBinaryJsonPrivate::Array *>(d->header->root());
+}
+
+QT_END_NAMESPACE
+
-- 
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