Added OS X filesystem-support

AthenaCore.pri

@@ -1,8 +1,11 @@
 !contains(ATHENA_PRO, true): {
     INCLUDEPATH += $$PWD/include
+    mac:INCLUDEPATH += /usr/local/include
     unix:LIBS += -lz -llzo2
     win32:LIBS += -lz -llzo2
+    mac:LIBS += -L/usr/local/lib -lz -llzo2
     QMAKE_CXXFLAGS += -std=c++11
+    mac:QMAKE_CXXFLAGS += -stdlib=libc++
 }
 
 ATHENA_CORE=true
@@ -21,7 +24,12 @@ SOURCES += \
     $$PWD/src/LZ77/LZType11.cpp \
     $$PWD/src/LZ77/LZBase.cpp
 
-win32:SOURCES += $$PWD/src/win32_largefilewrapper.c
+win32:SOURCES += \
+    $$PWD/src/win32_largefilewrapper.c
+
+mac:SOURCES += \
+    $$PWD/src/osx_largefilewrapper.c
+
 
 HEADERS += \
     $$PWD/include/Athena/IStream.hpp \
@@ -53,3 +61,7 @@ HEADERS += \
 
 win32:HEADERS += \
     $$PWD/include/win32_largefilewrapper.h
+
+mac:HEADERS += \
+    $$PWD/include/osx_largefilewrapper.h
+

include/osx_largefilewrapper.h

@@ -0,0 +1,16 @@
+#ifndef OSX_LARGEFILEWRAPPER_H
+#define OSX_LARGEFILEWRAPPER_H
+
+#if defined(__APPLE__)
+#include <stdio.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+int fseeko64(FILE* fp, off_t offset, int whence);
+off_t ftello64(FILE* fp);
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif // OSX_LARGEFILEWRAPPER_H

src/Athena/FileReader.cpp

@@ -20,8 +20,10 @@
 #include "Athena/IOException.hpp"
 #include "utf8.h"
 
-#ifdef _WIN32
+#if _WIN32
 #include "win32_largefilewrapper.h"
+#elif __APPLE__
+#include "osx_largefilewrapper.h"
 #endif
 
 namespace Athena

src/Athena/FileWriter.cpp

@@ -19,8 +19,10 @@
 #include "Athena/InvalidOperationException.hpp"
 #include "Athena/IOException.hpp"
 
-#ifdef _MSC_VER
+#if _WIN32
 #include "win32_largefilewrapper.h"
+#elif __APPLE__
+#include "osx_largefilewrapper.h"
 #endif
 
 #include "utf8.h"

src/osx_largefilewrapper.c

@@ -0,0 +1,13 @@
+#include "osx_largefilewrapper.h"
+#include <stdio.h>
+
+int fseeko64(FILE* fp, off_t offset, int whence)
+{
+    return fseeko(fp, offset, whence);
+}
+
+off_t ftello64(FILE* fp)
+{
+    return ftello(fp);
+}
+