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