From 86d3baf2c6c6ff3bb987dcd30cd606f0a45ef626 Mon Sep 17 00:00:00 2001
From: Arno <arno@disconnect.de>
Date: Fri, 2 Sep 2016 21:23:37 +0200
Subject: Basic Version of FileWidget

It checks the DB for md5sums and colors the files accordingly.

As I said: very basic!
---
 helper.cpp | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 helper.cpp

(limited to 'helper.cpp')

diff --git a/helper.cpp b/helper.cpp
new file mode 100644
index 0000000..d19cdf1
--- /dev/null
+++ b/helper.cpp
@@ -0,0 +1,50 @@
+#include <QFile>
+#include <QFileInfo>
+#include <QCryptographicHash>
+#include <QByteArray>
+
+#include "helper.h"
+
+namespace Helper {
+    const QString md5Sum(const QString &path){
+        QFileInfo info(path);
+        if(!info.exists() || !info.isFile()){
+            return QString();
+        }
+
+        QString retval;
+        QCryptographicHash h(QCryptographicHash::Md5);
+        QFile file(path);
+        file.open(QIODevice::ReadOnly);
+        qint64 read = 0;
+        if(info.size() < (5 * 1024 * 1024)){
+            QByteArray data(4096, '\0');
+            do {
+                read = file.read(data.data(), 4096);
+                if(read > 0){
+                    h.addData(data.data(), read);
+                }
+            } while (read == 4096);
+            QByteArray res = h.result();
+            retval = res.toHex().toLower();
+        }else{
+            QByteArray data(512, '\0');
+            int offset = info.size() / 3;
+            file.seek(offset);
+            int numBytes = 512 * 1024;
+            int readBytes = 0;
+            do {
+                read = file.read(data.data(), 512);
+                if(read > 0){
+                    readBytes += read;
+                }else{
+                    return QString();
+                }
+                h.addData(data.data(), read);
+            } while(readBytes < numBytes);
+            QByteArray res = h.result();
+            retval = res.toHex().toLower();
+        }
+        return retval;
+    }
+}
-- 
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