C++网址(URL)编码和解码

最近在做，C++的爬虫，需要编码和解码网址（URL）

URL解码函数

[cpp]static int php_htoi(char *s)
{
int value;
int c;

c = ((unsigned char *)s)[0];
if (isupper(c))
c = tolower(c);
value = (c >= ‘0’ && c <= '9' ? c - '0' : c - 'a' + 10) * 16; c = ((unsigned char *)s)[1]; if (isupper(c)) c = tolower(c); value += c >= ‘0’ && c <= '9' ? c - '0' : c - 'a' + 10; return (value); } /* {{{ URL解码，提取自PHP 5.2.17 用法：string urldecode(string str_source) 时间：2012-8-14 By Dewei */ string urldecode(string &str_source) { char const *in_str = str_source.c_str(); int in_str_len = strlen(in_str); int out_str_len = 0; string out_str; char *str; str = _strdup(in_str); char *dest = str; char *data = str; while (in_str_len--) { if (*data == '+') { *dest = ' '; } else if (*data == '%' && in_str_len >= 2 && isxdigit((int) *(data + 1))
&& isxdigit((int) *(data + 2))) {
*dest = (char) php_htoi(data + 1);
data += 2;
in_str_len -= 2;
} else {
*dest = *data;
}
data++;
dest++;
}
*dest = ‘\0’;
out_str_len = dest – str;
out_str = str;
free(str);
return out_str;
}[/cpp]

URL编码函数

[cpp]/* {{{ URL编码，提取自PHP
用法：string urlencode(string str_source)
说明：仅不编码 -_. 其余全部编码，空格会被编码为 +
时间：2012-8-13 By Dewei
*/
string urlencode(string &str_source)
{
char const *in_str = str_source.c_str();
int in_str_len = strlen(in_str);
int out_str_len = 0;
string out_str;
register unsigned char c;
unsigned char *to, *start;
unsigned char const *from, *end;
unsigned char hexchars[] = “0123456789ABCDEF”;

from = (unsigned char *)in_str;
end = (unsigned char *)in_str + in_str_len;
start = to = (unsigned char *) malloc(3*in_str_len+1);

while (from < end) { c = *from++; if (c == ' ') { *to++ = '+'; } else if ((c < '0' && c != '-' && c != '.') || (c < 'A' && c > ‘9’) ||
(c > ‘Z’ && c < 'a' && c != '_') || (c > ‘z’)) {
to[0] = ‘%’;
to[1] = hexchars[c >> 4];
to[2] = hexchars[c & 15];
to += 3;
} else {
*to++ = c;
}
}
*to = 0;

out_str_len = to – start;
out_str = (char *) start;
free(start);
return out_str;
}
/* }}} */

/* {{{ URL编码CString版，提取自PHP 5.2.17
用法：CString urlencode(CString str_source)
说明：仅不编码 -_. 其余全部编码，空格会被编码为 +
时间：2012-8-13 By Dewei
*/
CString urlencode(CString &str_source)
{
char const *in_str = str_source;
int in_str_len = strlen(in_str);
int out_str_len = 0;
CString out_str = ‘\0’;
register unsigned char c;
unsigned char *to, *start;
unsigned char const *from, *end;
unsigned char hexchars[] = “0123456789ABCDEF”;

from = (unsigned char *)in_str;
end = (unsigned char *)in_str + in_str_len;
start = to = (unsigned char *) malloc(3*in_str_len+1);

while (from < end) { c = *from++; if (c == ' ') { *to++ = '+'; } else if ((c < '0' && c != '-' && c != '.') || (c < 'A' && c > ‘9’) ||
(c > ‘Z’ && c < 'a' && c != '_') || (c > ‘z’)) {
to[0] = ‘%’;
to[1] = hexchars[c >> 4];
to[2] = hexchars[c & 15];
to += 3;
} else {
*to++ = c;
}
}
*to = 0;

out_str_len = to – start;
out_str = (char *) start;
free(start);
return out_str;
}[/cpp]
 
代码所有：dewei.iteye.com