Update ttvfs to new version

ExternalLibs/ttvfs_cfileapi/ttvfs_stdio.h

@@ -0,0 +1,86 @@
+#ifndef TTVFS_STDIO_OVERRIDE_H
+#define TTVFS_STDIO_OVERRIDE_H
+
+// Before including this file:
+// * Define VFS_ENABLE_C_API to 0 to use the normal functions (fopen() and friends, std::ifstream).
+// * Define VFS_ENABLE_C_API to 1 to use ttvfs overrides.
+
+/*
+    This file is a minimal wrapper to replace the C API and std::ifstream.
+    Note that if you have an advanced needs, this wrapper API is not for you.
+
+    To use it, go through your code and rename all FILE* to VFILE*,
+    and fopen() and related to vfopen() (so just put a 'v' in front).
+    Instead of std::ifstream, use InStream. If you use std::fstream for reading ONLY,
+    also use InStream.
+
+    Note that the seek and tell functions do not offer 64 bit offsets in this API.
+*/
+
+
+//-------------------------------------------------
+#if VFS_ENABLE_C_API-0 == 1
+
+#include <iostream>
+#include <sstream>
+#include <ttvfs.h>
+
+typedef ttvfs::File VFILE;
+
+
+void ttvfs_setroot(ttvfs::Root *root);
+
+VFILE *vfopen(const char *fn, const char *mode);
+size_t vfread(void *ptr, size_t size, size_t count, VFILE *vf);
+int vfclose(VFILE *vf);
+size_t vfwrite(const void *ptr, size_t size, size_t count, VFILE *vf);
+int vfseek(VFILE *vf, long int offset, int origin);
+char *vfgets(char *str, int num, VFILE *vf);
+long int vftell(VFILE *vf);
+int vfsize(VFILE *vf, size_t *sizep); // extension
+
+// This class is a minimal adapter to support STL-like read-only file streams for VFS files, using std::istringstream.
+// It loads the whole file content at once. If this is a problem, roll your own, or use the lower-level ttvfs::File functions.
+class InStream : public std::istringstream
+{
+public:
+    InStream(const char *fn);
+    InStream(const std::string& fn);
+    bool open(const char *fn);
+    inline bool is_open() { return good(); }
+    void close() {}
+private:
+    void _init(const char *fn);
+};
+
+#define VFS_USING_C_API 1
+
+//--------------------------------------------------
+#elif VFS_ENABLE_C_API-0 == 0
+
+#include <stdio.h>
+#include <iostream>
+#include <fstream>
+#include <sstream>
+typedef std::ifstream InStream;
+typedef FILE VFILE;
+
+int ttvfs_stdio_fsize(VFILE *f, size_t *sizep); // extension
+
+#define vfopen        fopen
+#define vfread        fread
+#define vfclose       fclose
+#define vfwrite       fwrite
+#define vfseek        fseek
+#define vfgets        fgets
+#define vftell        ftell
+#define vfsize        ttvfs_stdio_fsize
+
+//-------------------------------------------------
+#else // VFS_ENABLE_C_API
+   // Help catch errors or forgotten defines if this file is included
+#  error #define VFS_ENABLE_C_API to either 0 or 1
+#endif
+
+
+#endif // FILE_API_H