kopia lustrzana https://github.com/PiInTheSky/lora-gateway
52 wiersze
1.3 KiB
C
52 wiersze
1.3 KiB
C
#include <stdlib.h>
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#include <string.h>
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/* Converts a hex character to its integer value */
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char from_hex(char ch) {
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return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
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}
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/* Converts an integer value to its hex character*/
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char to_hex(char code) {
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static char hex[] = "0123456789abcdef";
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return hex[code & 15];
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}
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/* Returns a url-encoded version of str */
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/* IMPORTANT: be sure to free() the returned string after use */
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char *url_encode(char *str) {
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char *pstr = str, *buf = malloc(strlen(str) * 3 + 1), *pbuf = buf;
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while (*pstr) {
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if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~')
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*pbuf++ = *pstr;
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else if (*pstr == ' ')
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*pbuf++ = '+';
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else
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*pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(*pstr & 15);
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pstr++;
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}
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*pbuf = '\0';
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return buf;
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}
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/* Returns a url-decoded version of str */
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/* IMPORTANT: be sure to free() the returned string after use */
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char *url_decode(char *str) {
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char *pstr = str, *buf = malloc(strlen(str) + 1), *pbuf = buf;
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while (*pstr) {
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if (*pstr == '%') {
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if (pstr[1] && pstr[2]) {
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*pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]);
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pstr += 2;
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}
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} else if (*pstr == '+') {
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*pbuf++ = ' ';
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} else {
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*pbuf++ = *pstr;
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}
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pstr++;
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}
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*pbuf = '\0';
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return buf;
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} |