/usr/include/boost/beast/core/detail
Edit: /usr/include/boost/beast/core/detail/base64.ipp (6170B)
//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
/*
Portions from http://www.adp-gmbh.ch/cpp/common/base64.html
Copyright notice:
base64.cpp and base64.h
Copyright (C) 2004-2008 Rene Nyffenegger
This source code is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this source code must not be misrepresented; you must not
claim that you wrote the original source code. If you use this source code
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original source code.
3. This notice may not be removed or altered from any source distribution.
Rene Nyffenegger rene.nyffenegger@adp-gmbh.ch
*/
#ifndef BOOST_BEAST_DETAIL_BASE64_IPP
#define BOOST_BEAST_DETAIL_BASE64_IPP
#include
#include
#include
#include
#include
namespace boost {
namespace beast {
namespace detail {
namespace base64 {
char const*
get_alphabet()
{
static char constexpr tab[] = {
"ABCDEFGHIJKLMNOP"
"QRSTUVWXYZabcdef"
"ghijklmnopqrstuv"
"wxyz0123456789+/"
};
return &tab[0];
}
signed char const*
get_inverse()
{
static signed char constexpr tab[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0-15
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 16-31
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, // 32-47
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, // 48-63
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 64-79
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, // 80-95
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 96-111
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, // 112-127
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 128-143
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 144-159
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 160-175
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 176-191
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 192-207
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 208-223
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 224-239
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 // 240-255
};
return &tab[0];
}
/** Encode a series of octets as a padded, base64 string.
The resulting string will not be null terminated.
@par Requires
The memory pointed to by `out` points to valid memory
of at least `encoded_size(len)` bytes.
@return The number of characters written to `out`. This
will exclude any null termination.
*/
std::size_t
encode(void* dest, void const* src, std::size_t len)
{
char* out = static_cast(dest);
char const* in = static_cast(src);
auto const tab = base64::get_alphabet();
for(auto n = len / 3; n--;)
{
*out++ = tab[ (in[0] & 0xfc) >> 2];
*out++ = tab[((in[0] & 0x03) << 4) + ((in[1] & 0xf0) >> 4)];
*out++ = tab[((in[2] & 0xc0) >> 6) + ((in[1] & 0x0f) << 2)];
*out++ = tab[ in[2] & 0x3f];
in += 3;
}
switch(len % 3)
{
case 2:
*out++ = tab[ (in[0] & 0xfc) >> 2];
*out++ = tab[((in[0] & 0x03) << 4) + ((in[1] & 0xf0) >> 4)];
*out++ = tab[ (in[1] & 0x0f) << 2];
*out++ = '=';
break;
case 1:
*out++ = tab[ (in[0] & 0xfc) >> 2];
*out++ = tab[((in[0] & 0x03) << 4)];
*out++ = '=';
*out++ = '=';
break;
case 0:
break;
}
return out - static_cast(dest);
}
/** Decode a padded base64 string into a series of octets.
@par Requires
The memory pointed to by `out` points to valid memory
of at least `decoded_size(len)` bytes.
@return The number of octets written to `out`, and
the number of characters read from the input string,
expressed as a pair.
*/
std::pair
decode(void* dest, char const* src, std::size_t len)
{
char* out = static_cast(dest);
auto in = reinterpret_cast(src);
unsigned char c3[3], c4[4];
int i = 0;
int j = 0;
auto const inverse = base64::get_inverse();
while(len-- && *in != '=')
{
auto const v = inverse[*in];
if(v == -1)
break;
++in;
c4[i] = v;
if(++i == 4)
{
c3[0] = (c4[0] << 2) + ((c4[1] & 0x30) >> 4);
c3[1] = ((c4[1] & 0xf) << 4) + ((c4[2] & 0x3c) >> 2);
c3[2] = ((c4[2] & 0x3) << 6) + c4[3];
for(i = 0; i < 3; i++)
*out++ = c3[i];
i = 0;
}
}
if(i)
{
c3[0] = ( c4[0] << 2) + ((c4[1] & 0x30) >> 4);
c3[1] = ((c4[1] & 0xf) << 4) + ((c4[2] & 0x3c) >> 2);
c3[2] = ((c4[2] & 0x3) << 6) + c4[3];
for(j = 0; j < i - 1; j++)
*out++ = c3[j];
}
return {out - static_cast(dest),
in - reinterpret_cast(src)};
}
} // base64
} // detail
} // beast
} // boost
#endif