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| //
| // 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 <boost/beast/core/detail/base64.hpp>
| #include <boost/beast/core/string.hpp>
| #include <cctype>
| #include <string>
| #include <utility>
|
| 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<char*>(dest);
| char const* in = static_cast<char const*>(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<char*>(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<std::size_t, std::size_t>
| decode(void* dest, char const* src, std::size_t len)
| {
| char* out = static_cast<char*>(dest);
| auto in = reinterpret_cast<unsigned char const*>(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<char*>(dest),
| in - reinterpret_cast<unsigned char const*>(src)};
| }
|
| } // base64
|
| } // detail
| } // beast
| } // boost
|
| #endif
|
|
