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Diffstat (limited to 'zen/base64.h')
| -rw-r--r-- | zen/base64.h | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/zen/base64.h b/zen/base64.h deleted file mode 100644 index ae896e70..00000000 --- a/zen/base64.h +++ /dev/null @@ -1,157 +0,0 @@ -// ************************************************************************** -// * This file is part of the FreeFileSync project. It is distributed under * -// * GNU General Public License: http://www.gnu.org/licenses/gpl.html * -// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved * -// ************************************************************************** - -#ifndef BASE64_HEADER_08473021856321840873021487213453214 -#define BASE64_HEADER_08473021856321840873021487213453214 - -#ifndef NDEBUG //no release build dependencies! -#include <iterator> -#include <cassert> -#endif - -namespace zen -{ -//http://en.wikipedia.org/wiki/Base64 -/* -Usage: - const std::string input = "Sample text"; - std::string output; - zen::encodeBase64(input.begin(), input.end(), std::back_inserter(output)); - //output contains "U2FtcGxlIHRleHQ=" -*/ -template <class InputIterator, class OutputIterator> -OutputIterator encodeBase64(InputIterator first, InputIterator last, OutputIterator result); //nothrow! - -template <class InputIterator, class OutputIterator> -OutputIterator decodeBase64(InputIterator first, InputIterator last, OutputIterator result); //nothrow! - - - - - - - - - - - - -//------------------------- implementation ------------------------------- -namespace implementation -{ -//64 chars for base64 encoding + padding char -const char ENCODING_MIME[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; -const signed char DECODING_MIME[] = -{ - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, - 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, 64, -1, -1, - -1, 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, -1, -1, -1, -1, -1, - -1, 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, -1, -1, -1, -1, -1 -}; -const unsigned char INDEX_PAD = 64; //"=" -} - - -//http://en.wikipedia.org/wiki/Base64 -template <class InputIterator, class OutputIterator> inline -OutputIterator encodeBase64(InputIterator first, InputIterator last, OutputIterator result) -{ - using namespace implementation; - static_assert(sizeof(typename std::iterator_traits<InputIterator>::value_type) == 1, ""); - static_assert(sizeof(ENCODING_MIME) == 65 + 1, ""); - - while (first != last) - { - const unsigned char a = static_cast<unsigned char>(*first++); - *result++ = ENCODING_MIME[a >> 2]; - - if (first == last) - { - *result++ = ENCODING_MIME[((a & 0x3) << 4)]; - *result++ = ENCODING_MIME[INDEX_PAD]; - *result++ = ENCODING_MIME[INDEX_PAD]; - break; - } - const unsigned char b = static_cast<unsigned char>(*first++); - *result++ = ENCODING_MIME[((a & 0x3) << 4) | (b >> 4)]; - - if (first == last) - { - *result++ = ENCODING_MIME[((b & 0xf) << 2)]; - *result++ = ENCODING_MIME[INDEX_PAD]; - break; - } - const unsigned char c = static_cast<unsigned char>(*first++); - *result++ = ENCODING_MIME[((b & 0xf) << 2) | (c >> 6)]; - *result++ = ENCODING_MIME[c & 0x3f]; - } - - return result; -} - - -template <class InputIterator, class OutputIterator> inline -OutputIterator decodeBase64(InputIterator first, InputIterator last, OutputIterator result) -{ - using namespace implementation; - static_assert(sizeof(typename std::iterator_traits<InputIterator>::value_type) == 1, ""); - static_assert(sizeof(DECODING_MIME) == 128, ""); - - const unsigned char INDEX_END = INDEX_PAD + 1; - - auto readIndex = [&]() -> unsigned char //return index within [0, 64] or INDEX_END if end of input - { - while (true) - { - if (first == last) - return INDEX_END; - - const unsigned char ch = static_cast<unsigned char>(*first++); - if (ch < 128) //we're in lower ASCII table half - { - const int index = implementation::DECODING_MIME[ch]; - if (0 <= index && index <= static_cast<int>(INDEX_PAD)) //skip all unknown characters (including carriage return, line-break, tab) - return index; - } - } - }; - - for (;;) - { - const unsigned char index1 = readIndex(); - const unsigned char index2 = readIndex(); - if (index1 >= INDEX_PAD || index2 >= INDEX_PAD) - { - assert(index1 == INDEX_END && index2 == INDEX_END); - break; - } - *result++ = static_cast<char>((index1 << 2) | (index2 >> 4)); - - const unsigned char index3 = readIndex(); - if (index3 >= INDEX_PAD) //padding - { - assert(index3 == INDEX_PAD); - break; - } - *result++ = static_cast<char>(((index2 & 0xf) << 4) | (index3 >> 2)); - - const unsigned char index4 = readIndex(); - if (index4 >= INDEX_PAD) //padding - { - assert(index4 == INDEX_PAD); - break; - } - *result++ = static_cast<char>(((index3 & 0x3) << 6) | index4); - } - return result; -} -} - -#endif //BASE64_HEADER_08473021856321840873021487213453214 |