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//========================================================================
//
// InMemoryFile.h
//
// Represents a file in-memory with GNU's stdio wrappers.
// NOTE as of this writing, open() depends on the glibc 'fopencookie'
// extension and is not supported on other platforms. The
// HAVE_IN_MEMORY_FILE macro is intended to reflect whether this class is
// usable.
//
// This file is licensed under the GPLv2 or later
//
// Copyright (C) 2018, 2019 Greg Knight <lyngvi@gmail.com>
//
//========================================================================
#ifndef IN_MEMORY_FILE_H
#define IN_MEMORY_FILE_H
#include <cstdio>
#include <string>
#include <vector>
#if defined(__USE_GNU) && !defined(__ANDROID_API__)
# define HAVE_IN_MEMORY_FILE (1)
# define HAVE_IN_MEMORY_FILE_FOPENCOOKIE (1) // used internally
#endif
class InMemoryFile {
private:
size_t iohead;
std::vector<char> data;
FILE *fptr;
#ifdef HAVE_IN_MEMORY_FILE_FOPENCOOKIE
ssize_t _read(char* buf, size_t sz);
ssize_t _write(const char* buf, size_t sz);
int _seek(off64_t* offset, int whence);
#endif
public:
InMemoryFile();
public:
/* Returns a file handle for this file. This is scoped to this object
* and must be fclosed() by the caller before destruction. */
FILE* open(const char* mode);
const std::vector<char>& getBuffer() const
{ return data; }
};
#endif // IN_MEMORY_FILE_H
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