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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "common.h"
#include "log.h"
#include "url.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 = malloc(strlen(str) * 3 + 1);
if(!buf)
fatal("Cannot allocate memory.");
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';
// FIX: I think this is prudent. URLs can be as long as 2 KiB or more.
// We allocated 3 times more space to accomodate %NN encoding of
// non ASCII chars. If URL has none of these kind of chars we will
// end up with a big unused buffer.
//
// Try to shrink the buffer...
if (!!(pbuf = (char *)realloc(buf, strlen(buf)+1)))
buf = pbuf;
return buf;
}
/* Returns a url-decoded version of str */
/* IMPORTANT: be sure to free() the returned string after use */
char *url_decode(char *str) {
char *pstr = str,
*buf = malloc(strlen(str) + 1),
*pbuf = buf;
if(!buf)
fatal("Cannot allocate memory.");
while (*pstr) {
if (*pstr == '%') {
if (pstr[1] && pstr[2]) {
*pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]);
pstr += 2;
}
}
else if (*pstr == '+')
*pbuf++ = ' ';
else
*pbuf++ = *pstr;
pstr++;
}
*pbuf = '\0';
return buf;
}
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