File size: 1,680 Bytes
fe775b6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | // This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2020 Jérémie Dumas <jeremie.dumas@ens-lyon.org>
// Copyright (C) 2021 Alec Jacobson <alecjacobson@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_FILEMEMORYSTREAM_H
#define IGL_FILEMEMORYSTREAM_H
#include "igl_inline.h"
#include <streambuf>
#include <istream>
#include <string>
namespace igl {
struct FileMemoryBuffer : public std::streambuf
{
char *p_start{nullptr};
char *p_end{nullptr};
size_t size;
FileMemoryBuffer(char const *first_elem, size_t size)
: p_start(const_cast<char *>(first_elem)), p_end(p_start + size),
size(size)
{
setg(p_start, p_start, p_end);
}
pos_type seekoff(
off_type off,
std::ios_base::seekdir dir,
std::ios_base::openmode which) override
{
if (dir == std::ios_base::cur)
{
gbump(static_cast<int>(off));
}else
{
setg(p_start,(dir==std::ios_base::beg ? p_start : p_end) + off,p_end);
}
return gptr() - p_start;
}
pos_type seekpos(pos_type pos, std::ios_base::openmode which) override
{
return seekoff(pos, std::ios_base::beg, which);
}
};
struct FileMemoryStream : virtual FileMemoryBuffer, public std::istream
{
FileMemoryStream( char const *first_elem, size_t size)
: FileMemoryBuffer(first_elem, size),
std::istream( static_cast<std::streambuf *>(this))
{}
};
}
#endif
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