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construct/include/ircd/base.h
2019-06-26 01:52:42 -07:00

112 lines
3.3 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_BASE_H
namespace ircd
{
// Binary -> Base58 encode suite
constexpr size_t b58encode_size(const size_t &);
size_t b58encode_size(const const_buffer &in);
string_view b58encode(const mutable_buffer &out, const const_buffer &in);
std::string b58encode(const const_buffer &in);
// Base58 -> Binary decode suite
constexpr size_t b58decode_size(const size_t &);
size_t b58decode_size(const string_view &in);
const_buffer b58decode(const mutable_buffer &out, const string_view &in);
std::string b58decode(const string_view &in);
// Binary -> Base64 conversion suite
constexpr size_t b64encode_size(const size_t &);
size_t b64encode_size(const const_buffer &in);
string_view b64encode(const mutable_buffer &out, const const_buffer &in);
std::string b64encode(const const_buffer &in);
// Binary -> Base64 conversion without padding
constexpr size_t b64encode_unpadded_size(const size_t &);
size_t b64encode_unpadded_size(const const_buffer &in);
string_view b64encode_unpadded(const mutable_buffer &out, const const_buffer &in);
std::string b64encode_unpadded(const const_buffer &in);
// Base64 -> Binary conversion (padded or unpadded)
constexpr size_t b64decode_size(const size_t &);
size_t b64decode_size(const string_view &in);
const_buffer b64decode(const mutable_buffer &out, const string_view &in);
std::string b64decode(const string_view &in);
// Base64 convenience conversions
string_view b64tob58(const mutable_buffer &out, const string_view &in);
string_view b58tob64(const mutable_buffer &out, const string_view &in);
string_view b58tob64_unpadded(const mutable_buffer &out, const string_view &in);
string_view b64tob64url(const mutable_buffer &out, const string_view &in);
string_view b64urltob64(const mutable_buffer &out, const string_view &in);
}
inline size_t
ircd::b64decode_size(const string_view &in)
{
return b64decode_size(size(in));
}
constexpr size_t
ircd::b64decode_size(const size_t &in)
{
return (in * 0.75) + 1; //XXX: constexpr ceil()
}
inline size_t
ircd::b64encode_unpadded_size(const const_buffer &in)
{
return b64encode_unpadded_size(size(in));
}
constexpr size_t
ircd::b64encode_unpadded_size(const size_t &in)
{
return (in * (4.0 / 3.0)) + 1; //XXX: constexpr ceil()
}
inline size_t
ircd::b64encode_size(const const_buffer &in)
{
return b64encode_size(size(in));
}
constexpr size_t
ircd::b64encode_size(const size_t &in)
{
return ((in * (4.0 / 3.0)) + 1) + (3 - in % 3) % 3; //XXX: constexpr ceil
}
inline size_t
ircd::b58decode_size(const string_view &in)
{
return b58decode_size(size(in));
}
constexpr size_t
ircd::b58decode_size(const size_t &in)
{
return in * 733UL / 1000UL + 1UL; // log(58) / log(256), rounded up
}
inline size_t
ircd::b58encode_size(const const_buffer &in)
{
return b58encode_size(size(in));
}
constexpr size_t
ircd::b58encode_size(const size_t &in)
{
return in * 138UL / 100UL + 1UL; // log(256) / log(58), rounded up
}