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// Copyright (c) 2014-2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
/*! \file json_archive.h
*
* \brief JSON archive
*/
#pragma once
#include "serialization.h"
#include <cassert>
#include <iostream>
#include <iomanip>
/*! \struct json_archive_base
*
* \brief the base class of json archive type
*
* \detailed contains the basic logic for serializing a json archive
*/
template <class Stream, bool IsSaving>
struct json_archive_base
{
typedef Stream stream_type;
typedef json_archive_base<Stream, IsSaving> base_type;
typedef boost::mpl::bool_<IsSaving> is_saving;
typedef const char *variant_tag_type;
json_archive_base(stream_type &s, bool indent = false)
: stream_(s), indent_(indent), object_begin(false), depth_(0) { }
bool good() const { return stream_.good(); }
void set_fail() { stream_.setstate(std::ios::failbit); }
void clear_fail() { stream_.clear(); }
void tag(const char *tag) {
if (!object_begin)
stream_ << ", ";
make_indent();
stream_ << '"' << tag << "\": ";
object_begin = false;
}
void begin_object()
{
stream_ << "{";
++depth_;
object_begin = true;
}
void end_object()
{
--depth_;
make_indent();
stream_ << "}";
}
void begin_variant() { begin_object(); }
void end_variant() { end_object(); }
bool varint_bug_backward_compatibility_enabled() const { return false; }
protected:
void make_indent()
{
if (indent_)
{
stream_ << '\n' << std::string(2 * depth_, ' ');
}
}
protected:
stream_type &stream_;
bool indent_;
bool object_begin;
size_t depth_;
};
/*! \struct json_archive
*
* \brief a archive using the JSON standard
*
* \detailed only supports being written to
*/
template <bool W>
struct json_archive;
template <>
struct json_archive<true> : public json_archive_base<std::ostream, true>
{
json_archive(stream_type &s, bool indent = false) : base_type(s, indent), inner_array_size_(0) { }
std::streampos getpos() const { return stream_.tellp(); }
template<typename T>
static auto promote_to_printable_integer_type(T v) -> decltype(+v)
{
// Unary operator '+' performs integral promotion on type T [expr.unary.op].
// If T is signed or unsigned char, it's promoted to int and printed as number.
return +v;
}
template <class T>
void serialize_int(T v)
{
stream_ << std::dec << promote_to_printable_integer_type(v);
}
void serialize_blob(void *buf, size_t len, const char *delimiter="\"") {
begin_string(delimiter);
for (size_t i = 0; i < len; i++) {
unsigned char c = ((unsigned char *)buf)[i];
stream_ << std::hex << std::setw(2) << std::setfill('0') << (int)c;
}
end_string(delimiter);
}
template <class T>
void serialize_varint(T &v)
{
stream_ << std::dec << promote_to_printable_integer_type(v);
}
void begin_string(const char *delimiter="\"")
{
stream_ << delimiter;
}
void end_string(const char *delimiter="\"")
{
stream_ << delimiter;
}
void begin_array(size_t s=0)
{
inner_array_size_ = s;
++depth_;
stream_ << "[ ";
}
void delimit_array()
{
stream_ << ", ";
}
void end_array()
{
--depth_;
if (0 < inner_array_size_)
{
make_indent();
}
stream_ << "]";
}
void write_variant_tag(const char *t)
{
tag(t);
}
private:
size_t inner_array_size_;
};
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