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// Copyright 2016 Daniel Parker
// Distributed under the Boost license, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See https://github.com/danielaparker/jsoncons for latest version
#ifndef JSONCONS_OVECTORSTREAM_HPP
#define JSONCONS_OVECTORSTREAM_HPP
#include <ios>
#include <ostream>
#include <string>
#include <cstddef>
#include <vector>
#include "jsoncons/jsoncons_config.hpp"
namespace jsoncons {
template<
class CharT,
class Traits = std::char_traits<CharT>
> class basic_ovectorstream;
template<class CharT, class CharTraits>
class basic_ovectorbuf
: public std::basic_streambuf<CharT, CharTraits>
{
private:
std::ios_base::openmode mode_;
std::vector<CharT> buf_;
public:
typedef CharT char_type;
typedef typename CharTraits::int_type int_type;
typedef typename CharTraits::pos_type pos_type;
typedef typename CharTraits::off_type off_type;
typedef CharTraits traits_type;
typedef std::basic_streambuf<char_type, traits_type> base_streambuf;
public:
explicit basic_ovectorbuf(std::size_t length) JSONCONS_NOEXCEPT
: base_streambuf(),
mode_(std::ios_base::out | std::ios_base::binary),
buf_(length)
{
// Set write position to beginning of buffer.
this->setp(buf_.data(), buf_.data() + buf_.size());
}
virtual ~basic_ovectorbuf() {}
const CharT* data() const
{
return buf_.data();
}
protected:
int_type underflow() override
{
return this->gptr() != this->egptr() ?
CharTraits::to_int_type(*this->gptr()) : CharTraits::eof();
}
int_type pbackfail(int_type c = CharTraits::eof()) override
{
if (this->gptr() != this->eback())
{
if (!CharTraits::eq_int_type(c, CharTraits::eof()))
{
if (CharTraits::eq(CharTraits::to_char_type(c), this->gptr()[-1]))
{
this->gbump(-1);
return c;
}
this->gbump(-1);
*this->gptr() = c;
return c;
}
else
{
this->gbump(-1);
return CharTraits::not_eof(c);
}
}
else
{
return CharTraits::eof();
}
}
int_type overflow(int_type c = CharTraits::eof()) override
{
if (!CharTraits::eq_int_type(c, CharTraits::eof()))
{
size_t pos = buf_.size();
buf_.resize(pos*2);
this->setp(buf_.data(), buf_.data() + buf_.size());
this->pubseekpos(pos, std::ios_base::out);
*this->pptr() = CharTraits::to_char_type(c);
this->pbump(1);
this->pubsync();
return c;
}
else
{
return CharTraits::not_eof(c);
}
}
pos_type seekoff(off_type off, std::ios_base::seekdir dir,
std::ios_base::openmode mode = std::ios_base::out) override
{
(void)mode; // Always out
std::streamoff newoff;
switch (dir)
{
case std::ios_base::beg:
newoff = 0;
break;
case std::ios_base::end:
newoff = static_cast<std::streamoff>(buf_.size());
break;
case std::ios_base::cur:
newoff = static_cast<std::streamoff>(this->pptr() - this->pbase());
break;
default:
return pos_type(off_type(-1));
}
off += newoff;
std::ptrdiff_t n = this->epptr() - this->pbase();
if (off < 0 || off > n) return pos_type(off_type(-1));
else
{
this->setp(this->pbase(), this->pbase() + n);
this->pbump(static_cast<int>(off));
}
return pos_type(off);
}
pos_type seekoff_beg(off_type off)
{
std::ptrdiff_t n = this->epptr() - this->pbase();
if (off < 0 || off > n)
{
return pos_type(off_type(-1));
}
else
{
this->setp(this->pbase(), this->pbase() + n);
this->pbump(static_cast<int>(off));
}
return pos_type(off);
}
pos_type seekpos(pos_type pos, std::ios_base::openmode mode
= std::ios_base::out) override
{
(void)mode; // Always out
return seekoff_beg(pos - pos_type(off_type(0)));
}
};
template<class CharT, class CharTraits>
class basic_ovectorstream :
private basic_ovectorbuf<CharT, CharTraits>,
public std::basic_ostream<CharT, CharTraits>
{
public:
typedef typename std::basic_ios
<CharT, CharTraits>::char_type char_type;
typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
private:
typedef basic_ovectorbuf<CharT, CharTraits> base_ouputbuf;
typedef std::basic_ios<char_type, CharTraits> base_ios;
typedef std::basic_ostream<char_type, CharTraits> base_streambuf;
base_ouputbuf& get_buf() {return *this;}
const base_ouputbuf& get_buf() const {return *this;}
public:
basic_ovectorstream(std::size_t length) JSONCONS_NOEXCEPT
: base_ouputbuf(length),
base_streambuf(&get_buf())
{}
~basic_ovectorstream() {}
public:
size_t length()
{
return this->pptr() - this->pbase();
}
void set_locale(const std::locale& loc)
{
std::locale result = std::basic_ostream<CharT, CharTraits>::imbue(loc);
this->pubimbue(loc);
}
void reset()
{
this->clear();
this->seekp(0, std::ios::beg);
}
const CharT* data() const
{
return get_buf().data();
}
};
}
#endif
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