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