[BUGFIX] Define LLONG_MAX as an upper bound of FileSize

Author: hasherezade

parser/FileBuffer.cpp

@@ -95,6 +95,7 @@ ByteBuffer* AbstractFileBuffer::read(QFile &fIn, bufsize_t minBufSize, const boo
 bufsize_t AbstractFileBuffer::getReadableSize(QFile &fIn)
 {
     qint64 fileSize = fIn.size();
+    if (!fileSize) return 0;
     if (fileSize > qint64(FILE_MAXSIZE)) {
         fileSize = qint64(FILE_MAXSIZE);
     }

parser/include/bearparser/FileBuffer.h

@@ -1,9 +1,9 @@
 #pragma once
 #include <QtCore>
-
+#include <limits.h>
 #include "ByteBuffer.h"
 
-const bufsize_t FILE_MAXSIZE = BUFSIZE_MAX;
+const bufsize_t FILE_MAXSIZE = (LLONG_MAX > BUFSIZE_MAX ? BUFSIZE_MAX : LLONG_MAX);
 const bufsize_t FILEVIEW_MAXSIZE = (1024*1024*400); //419mb
 
 class FileBufferException : public BufferException