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libutil: Reserve memory when en/decoding base64

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The size of the output when encoding to and decoding from base64 is
(roughly) known so we can allocate it in advance to prevent
reallocation.
This commit is contained in:
Daniel Pauls 2022-04-05 21:16:11 +02:00
parent 27b952a8a1
commit 1fa0393479
1 changed files with 4 additions and 0 deletions
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4
src/libutil/util.cc
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@ -1471,6 +1471,7 @@ constexpr char base64Chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv
std::string base64Encode(std::string_view s)
{
std::string res;
res.reserve((s.size() + 2) / 3 * 4);
int data = 0, nbits = 0;
for (char c : s) {
@ -1502,6 +1503,9 @@ std::string base64Decode(std::string_view s)
}();
std::string res;
// Some sequences are missing the padding consisting of up to two '='.
// vvv
res.reserve((s.size() + 2) / 4 * 3);
unsigned int d = 0, bits = 0;
for (char c : s) {