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small util::base64_decode optimization

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This commit is contained in:
MihailRis 2024-01-25 02:18:50 +03:00
parent 3cfdbc8338
commit ba4338c4fa
1 changed files with 5 additions and 4 deletions
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9
src/util/stringutil.cpp
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@ -229,15 +229,16 @@ std::string util::base64_encode(const ubyte* data, size_t size) {
}
std::vector<ubyte> util::base64_decode(const char* str, size_t size) {
std::vector<ubyte> bytes;
std::vector<ubyte> bytes((size/4)*3);
ubyte* dst = bytes.data();
for (size_t i = 0; i < size;) {
ubyte a = base64_decode_char(ubyte(str[i++]));
ubyte b = base64_decode_char(ubyte(str[i++]));
ubyte c = base64_decode_char(ubyte(str[i++]));
ubyte d = base64_decode_char(ubyte(str[i++]));
bytes.push_back((a << 2) | ((b & 0b110000) >> 4));
bytes.push_back(((b & 0b1111) << 4) | ((c & 0b111100) >> 2));
bytes.push_back(((c & 0b11) << 6) | d);
*(dst++) = ((a << 2) | ((b & 0b110000) >> 4));
*(dst++) = (((b & 0b1111) << 4) | ((c & 0b111100) >> 2));
*(dst++) = (((c & 0b11) << 6) | d);
}
if (size >= 2) {
size_t outsize = bytes.size();