135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/*
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Copyright (C) 2004-2008 René Nyffenegger
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This source code is provided 'as-is', without any express or implied
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warranty. In no event will the author be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this source code must not be misrepresented; you must not
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claim that you wrote the original source code. If you use this source code
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original source code.
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3. This notice may not be removed or altered from any source distribution.
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René Nyffenegger rene.nyffenegger@adp-gmbh.ch
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*/
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#ifndef CEREAL_EXTERNAL_BASE64_HPP_
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#define CEREAL_EXTERNAL_BASE64_HPP_
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#ifdef __GNUC__
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wconversion"
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#endif
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#include <string>
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namespace cereal
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{
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namespace base64
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{
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static const std::string chars =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static inline bool is_base64(unsigned char c) {
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return (isalnum(c) || (c == '+') || (c == '/'));
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}
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inline std::string encode(unsigned char const* bytes_to_encode, size_t in_len) {
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std::string ret;
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int i = 0;
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int j = 0;
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unsigned char char_array_3[3];
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unsigned char char_array_4[4];
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while (in_len--) {
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char_array_3[i++] = *(bytes_to_encode++);
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if (i == 3) {
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char_array_4[0] = static_cast<unsigned char>((char_array_3[0] & 0xfc) >> 2);
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char_array_4[1] = static_cast<unsigned char>( ( ( char_array_3[0] & 0x03 ) << 4 ) + ( ( char_array_3[1] & 0xf0 ) >> 4 ) );
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char_array_4[2] = static_cast<unsigned char>( ( ( char_array_3[1] & 0x0f ) << 2 ) + ( ( char_array_3[2] & 0xc0 ) >> 6 ) );
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char_array_4[3] = static_cast<unsigned char>( char_array_3[2] & 0x3f );
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for(i = 0; (i <4) ; i++)
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ret += chars[char_array_4[i]];
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i = 0;
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}
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}
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if (i)
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{
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for(j = i; j < 3; j++)
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char_array_3[j] = '\0';
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char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
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char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
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char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
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char_array_4[3] = char_array_3[2] & 0x3f;
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for (j = 0; (j < i + 1); j++)
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ret += chars[char_array_4[j]];
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while((i++ < 3))
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ret += '=';
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}
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return ret;
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}
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inline std::string decode(std::string const& encoded_string) {
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size_t in_len = encoded_string.size();
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size_t i = 0;
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size_t j = 0;
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int in_ = 0;
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unsigned char char_array_4[4], char_array_3[3];
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std::string ret;
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while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
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char_array_4[i++] = encoded_string[in_]; in_++;
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if (i ==4) {
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for (i = 0; i <4; i++)
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char_array_4[i] = static_cast<unsigned char>(chars.find( char_array_4[i] ));
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char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
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char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
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char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
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for (i = 0; (i < 3); i++)
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ret += char_array_3[i];
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i = 0;
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}
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}
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if (i) {
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for (j = i; j <4; j++)
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char_array_4[j] = 0;
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for (j = 0; j <4; j++)
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char_array_4[j] = static_cast<unsigned char>(chars.find( char_array_4[j] ));
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char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
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char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
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char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
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for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
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}
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return ret;
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}
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} // namespace base64
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} // namespace cereal
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#ifdef __GNUC__
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#pragma GCC diagnostic pop
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#endif
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#endif // CEREAL_EXTERNAL_BASE64_HPP_
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