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#ifndef SHRINKWRAP_STDIO_HPP
#define SHRINKWRAP_STDIO_HPP
#include <streambuf>
#include <cstdio>
#include <vector>
#include <iostream>
#include <cassert>
namespace shrinkwrap
{
namespace stdio
{
class filebuf : public std::streambuf
{
private:
std::FILE* fp_;
public:
typedef filebuf self_type;
filebuf(std::FILE* fp) :
fp_(fp)
{ }
filebuf(self_type&& src) :
std::streambuf(std::move(src)),
fp_(src.fp_)
{
src.fp_ = nullptr;
}
self_type& operator=(self_type&& src)
{
if (this != &src)
{
std::streambuf::operator=(std::move(src));
this->destroy();
std::swap(fp_, src.fp_);
}
return *this;
}
void swap(self_type& src)
{
std::streambuf::swap(src);
std::swap(fp_, src.fp_);
}
~filebuf()
{
this->destroy();
}
void destroy()
{
if (fp_)
{
std::fclose(fp_);
fp_ = nullptr;
}
}
bool is_open() const
{
return fp_ != nullptr;
}
protected:
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
// buffer management and positioning virtual methods
virtual std::streambuf::pos_type seekoff(std::streambuf::off_type off, std::ios_base::seekdir way, std::ios_base::openmode which)
{
int origin;
if (way == std::ios::cur)
origin = SEEK_CUR;
else if (way == std::ios::end)
origin = SEEK_END;
else
origin = SEEK_SET;
if (fseek(fp_, off, origin))
return pos_type(off_type(-1));
return pos_type(off_type(std::ftell(fp_)));
}
virtual std::streambuf::pos_type seekpos(std::streambuf::pos_type pos, std::ios_base::openmode which)
{
if (fseek(fp_, pos, SEEK_SET))
return pos_type(off_type(-1));
assert(pos == pos_type(off_type(std::ftell(fp_))));
return pos;
}
virtual int sync()
{
return std::fflush(fp_);
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
// input virtual methods
virtual std::streamsize xsgetn(char* data, std::streamsize sz)
{
std::streamsize ret = std::fread(data, 1, sz, fp_);
if (std::ferror(fp_))
{
// TODO: throw exception
}
return ret;
}
virtual int underflow() // This supports istream::peek()
{
int ret = std::getc(fp_);
return std::ungetc(ret, fp_);
}
virtual int uflow() // This supports istream::get()
{
return std::getc(fp_);
}
virtual int pbackfail(int c)
{
return std::ungetc(c, fp_); // Does not support istream::unget(), which is indicated by c equaling EOF
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
// output virtual methods
virtual std::streamsize xsputn(const char* data, std::streamsize sz)
{
std::streamsize ret = std::fwrite(data, 1, sz, fp_);
if (ret != sz)
{
// TODO throw exception
}
return ret;
}
virtual int overflow(int c)
{
if (!traits_type::eq_int_type(c, traits_type::eof()))
return std::putc(c, fp_);
return traits_type::not_eof(c);
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //
};
class istream : public std::istream
{
public:
istream(const std::string& file_path) :
std::istream(&sbuf_),
sbuf_(std::fopen(file_path.c_str(), "rb"))
{
if (!sbuf_.is_open())
setstate(rdstate() | std::ios::badbit);
}
#if !defined(__GNUC__) || defined(__clang__) || __GNUC__ > 4
istream(istream&& src)
:
std::istream(&sbuf_),
sbuf_(std::move(src.sbuf_))
{
}
istream& operator=(istream&& src)
{
if (&src != this)
{
std::istream::operator=(std::move(src));
sbuf_ = std::move(src.sbuf_);
}
return *this;
}
#endif
private:
::shrinkwrap::stdio::filebuf sbuf_;
};
class ostream : public std::ostream
{
public:
ostream(const std::string& file_path)
:
std::ostream(&sbuf_),
sbuf_(std::fopen(file_path.c_str(), "wb"))
{
if (!sbuf_.is_open())
setstate(rdstate() | std::ios::badbit);
}
#if !defined(__GNUC__) || defined(__clang__) || __GNUC__ > 4
ostream(ostream&& src)
:
std::ostream(&sbuf_),
sbuf_(std::move(src.sbuf_))
{
}
ostream& operator=(ostream&& src)
{
if (&src != this)
{
std::ostream::operator=(std::move(src));
sbuf_ = std::move(src.sbuf_);
}
return *this;
}
#endif
private:
::shrinkwrap::stdio::filebuf sbuf_;
};
}
}
#endif //SHRINKWRAP_STDIO_HPP
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