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//
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// 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
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
/*! \file binary_archive.h
*
* Portable (low-endian) binary archive */
#pragma once
#include <cassert>
#include <iostream>
#include <iterator>
#include <boost/type_traits/make_unsigned.hpp>
#include "common/varint.h"
#include "warnings.h"
/* I have no clue what these lines means */
PUSH_WARNINGS
DISABLE_VS_WARNINGS(4244)
//TODO: fix size_t warning in x32 platform
/*! \struct binary_archive_base
*
* \brief base for the binary archive type
*
* \detailed It isn't used outside of this file, which its only
* purpse is to define the functions used for the binary_archive. Its
* a header, basically. I think it was declared simply to save typing...
*/
template <class Stream, bool IsSaving>
struct binary_archive_base
{
typedef Stream stream_type;
typedef binary_archive_base<Stream, IsSaving> base_type;
typedef boost::mpl::bool_<IsSaving> is_saving;
typedef uint8_t variant_tag_type;
explicit binary_archive_base(stream_type &s) : stream_(s) { }
/* definition of standard API functions */
void tag(const char *) { }
void begin_object() { }
void end_object() { }
void begin_variant() { }
void end_variant() { }
/* I just want to leave a comment saying how this line really shows
flaws in the ownership model of many OOP languages, that is all. */
stream_type &stream() { return stream_; }
protected:
stream_type &stream_;
};
/* \struct binary_archive
*
* \brief the actually binary archive type
*
* \detailed The boolean template argument /a W is the is_saving
* parameter for binary_archive_base.
*
* The is_saving parameter says whether the archive is being read from
* (false) or written to (true)
*/
template <bool W>
struct binary_archive;
template <>
struct binary_archive<false> : public binary_archive_base<std::istream, false>
{
explicit binary_archive(stream_type &s) : base_type(s), varint_bug_backward_compatibility_(false) {
stream_type::pos_type pos = stream_.tellg();
stream_.seekg(0, std::ios_base::end);
eof_pos_ = stream_.tellg();
stream_.seekg(pos);
}
template <class T>
void serialize_int(T &v)
{
serialize_uint(*(typename boost::make_unsigned<T>::type *)&v);
}
/*! \fn serialize_uint
*
* \brief serializes an unsigned integer
*/
template <class T>
void serialize_uint(T &v, size_t width = sizeof(T))
{
T ret = 0;
unsigned shift = 0;
for (size_t i = 0; i < width; i++) {
//std::cerr << "tell: " << stream_.tellg() << " value: " << ret << std::endl;
char c;
stream_.get(c);
T b = (unsigned char)c;
ret += (b << shift); // can this be changed to OR, i think it can.
shift += 8;
}
v = ret;
}
void serialize_blob(void *buf, size_t len, const char *delimiter="")
{
stream_.read((char *)buf, len);
}
template <class T>
void serialize_varint(T &v)
{
serialize_uvarint(*(typename boost::make_unsigned<T>::type *)(&v));
}
template <class T>
void serialize_uvarint(T &v)
{
typedef std::istreambuf_iterator<char> it;
if (tools::read_varint(it(stream_), it(), v) < 0)
stream_.setstate(std::ios_base::failbit);
}
void begin_array(size_t &s)
{
serialize_varint(s);
}
void begin_array() { }
void delimit_array() { }
void end_array() { }
void begin_string(const char *delimiter /*="\""*/) { }
void end_string(const char *delimiter /*="\""*/) { }
void read_variant_tag(variant_tag_type &t) {
serialize_int(t);
}
size_t remaining_bytes() {
if (!stream_.good())
return 0;
//std::cerr << "tell: " << stream_.tellg() << std::endl;
assert(stream_.tellg() <= eof_pos_);
return eof_pos_ - stream_.tellg();
}
void enable_varint_bug_backward_compatibility() { varint_bug_backward_compatibility_ = true; }
bool varint_bug_backward_compatibility_enabled() const { return varint_bug_backward_compatibility_; }
protected:
std::streamoff eof_pos_;
bool varint_bug_backward_compatibility_;
};
template <>
struct binary_archive<true> : public binary_archive_base<std::ostream, true>
{
explicit binary_archive(stream_type &s) : base_type(s) { }
template <class T>
void serialize_int(T v)
{
serialize_uint(static_cast<typename boost::make_unsigned<T>::type>(v));
}
template <class T>
void serialize_uint(T v)
{
for (size_t i = 0; i < sizeof(T); i++) {
stream_.put((char)(v & 0xff));
if (1 < sizeof(T)) v >>= 8;
}
}
void serialize_blob(void *buf, size_t len, const char *delimiter="")
{
stream_.write((char *)buf, len);
}
template <class T>
void serialize_varint(T &v)
{
serialize_uvarint(*(typename boost::make_unsigned<T>::type *)(&v));
}
template <class T>
void serialize_uvarint(T &v)
{
typedef std::ostreambuf_iterator<char> it;
tools::write_varint(it(stream_), v);
}
void begin_array(size_t s)
{
serialize_varint(s);
}
void begin_array() { }
void delimit_array() { }
void end_array() { }
void begin_string(const char *delimiter="\"") { }
void end_string(const char *delimiter="\"") { }
void write_variant_tag(variant_tag_type t) {
serialize_int(t);
}
bool varint_bug_backward_compatibility_enabled() const { return false; }
};
POP_WARNINGS
