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escape: use table lookup when adding %-codes to output

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On my dev host, this code runs 7.8 times faster.

Closes #10377
This commit is contained in:
Daniel Stenberg 2023-01-31 12:34:08 +01:00
parent b1e8cd52d9
commit fc8ad0b23c
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1 changed files with 6 additions and 3 deletions
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9
lib/escape.c
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@ -97,7 +97,7 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
return strdup("");
while(length--) {
unsigned char in = *string; /* we need to treat the characters unsigned */
unsigned char in = *string++; /* treat the characters unsigned */
if(Curl_isunreserved(in)) {
/* append this */
@ -106,10 +106,13 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
}
else {
/* encode it */
if(Curl_dyn_addf(&d, "%%%02X", in))
const char hex[] = "0123456789ABCDEF";
char out[3]={'%'};
out[1] = hex[in>>4];
out[2] = hex[in & 0xf];
if(Curl_dyn_addn(&d, out, 3))
return NULL;
}
string++;
}
return Curl_dyn_ptr(&d);