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Tune QUtil::hex_encode

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m-holger 2022-09-22 20:13:51 +01:00 committed by Jay Berkenbilt
parent 033a66e9a5
commit ae800361fe
1 changed files with 5 additions and 3 deletions
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8
libqpdf/QUtil.cc
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@ -769,10 +769,12 @@ QUtil::make_unique_cstr(std::string const& str)
std::string
QUtil::hex_encode(std::string const& input)
{
static auto constexpr hexchars = "0123456789abcdef";
std::string result;
for (unsigned int i = 0; i < input.length(); ++i) {
result += QUtil::int_to_string_base(
QIntC::to_int(static_cast<unsigned char>(input.at(i))), 16, 2);
result.reserve(2 * input.length());
for (const char c: input) {
result += hexchars[static_cast<unsigned char>(c) >> 4];
result += hexchars[c & 0x0f];
}
return result;
}