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JNI: handle narrowing before creating a new Java string

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Emit a warning if the string we get is too large for Java, and cast
the size to jsize before calling JNI.

For consistency, replace the Q_ASSERT in QJniArray's size check to use
the same logic.

Addresses header review comment; code was not handling this case before
it got moved into the inline helper either.

Change-Id: I00d68509be8b5f7304dda2e824fa0ced0f8f8d48
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
(cherry picked from commit 9d35561f6f6be125369e6020ce95a73b4aa6b51f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Volker Hilsheimer 2025-01-08 12:46:07 +01:00 committed by Qt Cherry-pick Bot
parent fdf4738be3
commit 15a1b718e6
2 changed files with 12 additions and 6 deletions
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10
src/corelib/kernel/qjniarray.h
View File

@ -11,8 +11,9 @@
#include <QtCore/qjniobject.h>
#include <iterator>
#include <utility>
#include <QtCore/q26numeric.h>
#include <QtCore/q20type_traits.h>
#include <QtCore/q20utility.h>
#if defined(Q_QDOC)
using jsize = qint32;
@ -479,9 +480,8 @@ public:
template <typename Container, if_compatible_source_container<Container> = true>
static auto fromContainer(Container &&container)
{
Q_ASSERT_X(size_t(std::size(container)) <= size_t((std::numeric_limits<size_type>::max)()),
"QJniArray::fromContainer", "Container is too large for a Java array");
if (!q20::in_range<size_type>(std::size(container)))
qWarning("QJniArray::fromContainer: Container is too large for Java and will be truncated!");
using ElementType = typename std::remove_reference_t<Container>::value_type;
if constexpr (std::is_base_of_v<std::remove_pointer_t<jobject>,
std::remove_pointer_t<ElementType>>) {
@ -915,7 +915,7 @@ auto QJniArrayBase::makeObjectArray(List &&list)
return ResultType();
JNIEnv *env = QJniEnvironment::getJniEnv();
const size_type length = size_type(std::size(list));
const size_type length = q26::saturate_cast<size_type>(std::size(list));
// this assumes that all objects in the list have the same class
jclass elementClass = nullptr;

8
src/corelib/kernel/qjnitypes_impl.h
View File

@ -5,7 +5,10 @@
#define QJNITYPES_IMPL_H
#include <QtCore/qstring.h>
#include <QtCore/q26numeric.h>
#include <QtCore/q20type_traits.h>
#include <QtCore/q20utility.h>
#if defined(Q_QDOC) || defined(Q_OS_ANDROID)
#include <jni.h>
@ -19,7 +22,10 @@ namespace Detail
{
static inline jstring fromQString(const QString &string, JNIEnv *env)
{
return env->NewString(reinterpret_cast<const jchar*>(string.constData()), string.length());
if (!q20::in_range<jsize>(string.size()))
qWarning("String is too large for a Java string and will be truncated");
const jsize length = q26::saturate_cast<jsize>(string.size());
return env->NewString(reinterpret_cast<const jchar*>(string.constData()), length);
}
static inline QString toQString(jstring string, JNIEnv *env)