New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/coding/internal/file64_api.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "std/target_os.hpp"
+
+#if defined(OMIM_OS_WINDOWS_NATIVE)
+  #define fseek64 _fseeki64
+  #define ftell64 _ftelli64
+
+#elif defined(OMIM_OS_WINDOWS_MINGW)
+  #define fseek64 fseeko64
+  #define ftell64 ftello64
+
+#else
+  // POSIX standart.
+  #include <sys/types.h>
+
+  // TODO: Always assert for 8 bytes after increasing min Android API to 24+.
+  // See more details here: https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
+  #if defined(OMIM_OS_ANDROID) && (defined(__arm__) || defined(__i386__))
+    static_assert(sizeof(off_t) == 4, "32-bit Android NDK < API 24 has only 32-bit file operations support");
+  #else
+    static_assert(sizeof(off_t) == 8, "FileReader and FileWriter require 64-bit file operations");
+  #endif
+  #define fseek64 fseeko
+  #define ftell64 ftello
+
+#endif
+
+#include <cstdio>