ywkaras commented on a change in pull request #7519:
URL: https://github.com/apache/trafficserver/pull/7519#discussion_r574894028
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File path: plugins/experimental/cookie_remap/cookie_remap.cc
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@@ -172,13 +240,25 @@ dec_to_hex(type _num, char *hdigits)
void
urlencode(std::string &str)
{
- size_t pos = 0;
- for (; pos < str.length(); pos++) {
- if (!isalnum(str[pos])) {
- char dec[2];
- dec_to_hex(str[pos], dec);
- std::string replacement = "%" + std::string(dec, 2);
- str.replace(pos, 1, replacement);
+ auto orig = str.size();
+ auto enc = orig;
+ for (auto c : str) {
+ if (!isalnum(c)) {
+ enc += 2;
+ }
+ }
+ if (enc == orig) {
+ // No changes needed.
+ return;
+ }
+ str.resize(enc);
+ while (orig--) {
+ if (!isalnum(str[orig])) {
+ enc -= 3;
+ dec_to_hex(str[orig], &(str[enc + 1]));
+ str[enc] = '%';
+ } else {
+ str[--enc] = str[orig];
Review comment:
I optimized this while I was in here, because it's potentially high
frequency code. Not related to the main purpose of the PR.
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