From 0b6842abd2877886dcb0ca4154e93d9bae1ef80c Mon Sep 17 00:00:00 2001
From: Linus Jahn <lnj@kaidan.im>
Date: Sat, 10 Sep 2022 18:43:04 +0200
Subject: QXmppError: Add fromIoDevice()

---
 src/base/QXmppError.cpp | 14 ++++++++++++++
 src/base/QXmppError.h   |  4 ++++
 2 files changed, 18 insertions(+)

(limited to 'src/base')

diff --git a/src/base/QXmppError.cpp b/src/base/QXmppError.cpp
index 80578c0d..eab4c749 100644
--- a/src/base/QXmppError.cpp
+++ b/src/base/QXmppError.cpp
@@ -31,6 +31,20 @@
 /// should tell you which types are used.
 ///
 
+///
+/// Constructs a QXmppError from an QIODevice
+///
+/// It tries to cast the IO device to different known IO devices to get a useful more specific
+/// error, i.e. it returns a QXmppError with QFileDevice::FileError for QFileDevices.
+///
+QXmppError QXmppError::fromIoDevice(const QIODevice &device)
+{
+    if (const auto *file = dynamic_cast<const QFileDevice *>(&device)) {
+        return QXmppError { file->errorString(), file->error() };
+    }
+    return QXmppError { device.errorString(), std::any() };
+}
+
 ///
 /// Returns whether the error is a QNetworkReply::NetworkError.
 ///
diff --git a/src/base/QXmppError.h b/src/base/QXmppError.h
index a646b6e5..677ce415 100644
--- a/src/base/QXmppError.h
+++ b/src/base/QXmppError.h
@@ -10,11 +10,15 @@
 #include <any>
 #include <optional>
 
+class QIODevice;
+
 struct QXMPP_EXPORT QXmppError
 {
     QString description;
     std::any error;
 
+    static QXmppError fromIoDevice(const QIODevice &device);
+
     bool isFileError() const;
     bool isNetworkError() const;
     bool isStanzaError() const;
-- 
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