Add convenience data retrieval method to QXmppBitsOfBinaryDataList

src/base/QXmppBitsOfBinaryData.cpp

@@ -215,6 +215,25 @@ QXmppBitsOfBinaryDataList::QXmppBitsOfBinaryDataList() = default;
 QXmppBitsOfBinaryDataList::~QXmppBitsOfBinaryDataList() = default;
 
 /// \cond
+
+///
+/// \brief Finds the data for a uri
+/// \return Data belonging to the uri
+///
+/// \since QXmpp 1.5
+///
+std::optional<QXmppBitsOfBinaryData> QXmppBitsOfBinaryDataList::find(const QXmppBitsOfBinaryContentId &cid) const
+{
+    const auto thumbnailData = std::find_if(begin(), end(), [&](const auto &bobBlob) {
+        return bobBlob.cid() == cid;
+    });
+
+    if (thumbnailData != end()) {
+        return *thumbnailData;
+    }
+    return {};
+}
+
 void QXmppBitsOfBinaryDataList::parse(const QDomElement &element)
 {
     // clear previous data elements

src/base/QXmppBitsOfBinaryDataList.h

@@ -8,6 +8,7 @@
 #include "QXmppBitsOfBinaryData.h"
 
 #include <QVector>
+#include <optional>
 
 class QDomElement;
 class QXmlStreamWriter;
@@ -18,6 +19,8 @@ class QXMPP_EXPORT QXmppBitsOfBinaryDataList : public QVector<QXmppBitsOfBinaryD
     QXmppBitsOfBinaryDataList();
     ~QXmppBitsOfBinaryDataList();
 
+    std::optional<QXmppBitsOfBinaryData> find(const QXmppBitsOfBinaryContentId &cid) const;
+
     /// \cond
     void parse(const QDomElement &element);
     void toXml(QXmlStreamWriter *writer) const;