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37 template <class OStream>
38 static void base64EncodeTriple(OStream &str, const unsigned char triple[3], size_t length = 3)
40 static const char base64Encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
42 // Convert 3 bytes of triplet into 4 bytes, write out 64 bit-wise using a character mapping,
43 // see description of base64.
44 unsigned tripleValue = triple[0] * 256;
45 tripleValue += triple[1];
47 tripleValue += triple[2];
49 char result[4]= {0, 0, 0, 0};
50 for (int i = 3; i >= 0 ; i--) {
51 result[i] = base64Encoding[tripleValue % 64];
55 // Write out quad and pad if it is a padding triple.
56 const size_t writeLength = length + 1;
58 for ( ; i < writeLength; i++)
64 template <class OStream>
65 void base64EncodeHelper(OStream &str, const unsigned char *source, size_t sourcelen)
72 const unsigned char *sourceEnd = source + sourcelen;
73 for (const unsigned char *triple = source; triple < sourceEnd; ) {
74 const unsigned char *nextTriple = triple + 3;
75 if (nextTriple <= sourceEnd) { // Encode full triple, including very last one
76 base64EncodeTriple(str, triple);
78 } else { // Past end and some padding required.
79 unsigned char paddingTriple[3] = {0, 0, 0};
80 std::copy(triple, sourceEnd, paddingTriple);
81 base64EncodeTriple(str, paddingTriple, sourceEnd - triple);
87 void base64Encode(std::ostream &str, const unsigned char *source, size_t sourcelen)
89 base64EncodeHelper(str, source, sourcelen);
92 std::string base64EncodeToString(const unsigned char *source, size_t sourcelen)
94 std::ostringstream str;
95 base64Encode(str, source, sourcelen);
99 void base64EncodeW(std::wostream &str, const unsigned char *source, size_t sourcelen)
101 base64EncodeHelper(str, source, sourcelen);
104 std::wstring base64EncodeToWString(const unsigned char *source, size_t sourcelen)
106 std::wostringstream str;
107 base64EncodeW(str, source, sourcelen);