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// SPDX-License-Identifier: GPL-3.0-or-later
#include "../libnetdata.h"
// ----------------------------------------------------------------------------
// URL encode / decode
// code from: http://www.geekhideout.com/urlcode.shtml
/* Converts a hex character to its integer value */
char from_hex(char ch) {
return (char)(isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10);
}
/* Converts an integer value to its hex character*/
char to_hex(char code) {
static char hex[] = "0123456789abcdef";
return hex[code & 15];
}
/* Returns a url-encoded version of str */
/* IMPORTANT: be sure to free() the returned string after use */
char *url_encode(char *str) {
char *buf, *pbuf;
pbuf = buf = mallocz(strlen(str) * 3 + 1);
while (*str) {
if (isalnum(*str) || *str == '-' || *str == '_' || *str == '.' || *str == '~')
*pbuf++ = *str;
else if (*str == ' ')
*pbuf++ = '+';
else
*pbuf++ = '%', *pbuf++ = to_hex(*str >> 4), *pbuf++ = to_hex(*str & 15);
str++;
}
*pbuf = '\0';
pbuf = strdupz(buf);
freez(buf);
return pbuf;
}
/* Returns a url-decoded version of str */
/* IMPORTANT: be sure to free() the returned string after use */
char *url_decode(char *str) {
size_t size = strlen(str) + 1;
char *buf = mallocz(size);
return url_decode_r(buf, str, size);
}
char *url_decode_r(char *to, char *url, size_t size) {
char *s = url, // source
*d = to, // destination
*e = &to[size - 1]; // destination end
while(*s && d < e) {
if(unlikely(*s == '%')) {
if(likely(s[1] && s[2])) {
char t = from_hex(s[1]) << 4 | from_hex(s[2]);
// avoid HTTP header injection
*d++ = (char)((isprint(t))? t : ' ');
s += 2;
}
}
else if(unlikely(*s == '+'))
*d++ = ' ';
else
*d++ = *s;
s++;
}
*d = '\0';
return to;
}
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