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/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
// Code copied & adapted from LibTomCrypt by Tom St Denis
#include <boost/numeric/conversion/cast.hpp>
#include <algorithm>
#include <Swiften/StringCodecs/Base64.h>
#include <Swiften/Base/Algorithm.h>
#pragma GCC diagnostic ignored "-Wold-style-cast"
#pragma clang diagnostic ignored "-Wconversion"
static const char *codes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
namespace {
template<typename TargetType, typename SourceType>
TargetType base64Encode(const SourceType& in) {
TargetType out;
size_t i;
unsigned int leven = 3*(in.size() / 3);
for (i = 0; i < leven; i += 3) {
out.push_back(codes[(in[i] >> 2) & 0x3F]);
out.push_back(codes[(((in[i] & 3) << 4) + (in[i+1] >> 4)) & 0x3F]);
out.push_back(codes[(((in[i+1] & 0xf) << 2) + (in[i+2] >> 6)) & 0x3F]);
out.push_back(codes[in[i+2] & 0x3F]);
}
if (i < in.size()) {
unsigned int a = in[i];
unsigned int b = (i+1 < in.size()) ? in[i+1] : 0;
out.push_back(codes[(a >> 2) & 0x3F]);
out.push_back(codes[(((a & 3) << 4) + (b >> 4)) & 0x3F]);
out.push_back((i+1 < in.size()) ? codes[(((b & 0xf) << 2)) & 0x3F] : '=');
out.push_back('=');
}
return out;
}
}
static const unsigned char map[256] = {
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255 };
namespace Swift {
std::string Base64::encode(const ByteArray &s) {
return base64Encode<std::string, ByteArray>(s);
}
SafeByteArray Base64::encode(const SafeByteArray &s) {
return base64Encode<SafeByteArray, SafeByteArray>(s);
}
ByteArray Base64::decode(const std::string& input) {
std::string inputWithoutNewlines(input);
erase(inputWithoutNewlines, '\n');
const std::string& s = inputWithoutNewlines;
ByteArray out;
int g = 3;
size_t y, t;
for (size_t x = y = t = 0; x < s.size(); ++x) {
unsigned char c = map[s[x]&0xFF];
if (c == 255) {
continue;
}
/* the final = symbols are read and used to trim the remaining bytes */
if (c == 254) {
c = 0;
/* prevent g < 0 which would potentially allow an overflow later */
if (--g < 0) {
return ByteArray();
}
} else if (g != 3) {
/* we only allow = to be at the end */
return ByteArray();
}
t = (t<<6)|c;
if (++y == 4) {
out.push_back((unsigned char)((t>>16)&255));
if (g > 1) out.push_back((unsigned char)((t>>8)&255));
if (g > 2) out.push_back((unsigned char)(t&255));
y = t = 0;
}
}
if (y != 0) {
return ByteArray();
}
return out;
}
}
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Swift