Qt封装URL编解码接口_qt urlencode

关于Qt自带的Url解码接口QUrl::fromPercentEncoding无法识别空格字符，会将其转为+，还有%后无法组成url编码规则的也会转成乱码字符。
因此需要采用C++的Url编解码规则，自己封装接口。

char dec2hexChar(short n) {
	if (0 <= n && n <= 9) {
		return char(short('0') + n);
	}
	else if (10 <= n && n <= 15) {
		return char(short('A') + n - 10);
	}
	else {
		return char(0);
	}
}

short hexChar2dec(char c) {
	if ('0' <= c && c <= '9') {
		return short(c - '0');
	}
	else if ('a' <= c && c <= 'f') {
		return (short(c - 'a') + 10);
	}
	else if ('A' <= c && c <= 'F') {
		return (short(c - 'A') + 10);
	}
	else {
		return -1;
	}
}
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Url编码接口

QString urlEncode(const QString &url)
{
	QString result;
	string _url = url.toStdString();
	for (unsigned int i = 0; i < _url.size(); i++) 
	{
		char c = _url[i];
		if (
			('0' <= c && c <= '9') ||
			('a' <= c && c <= 'z') ||
			('A' <= c && c <= 'Z') ||
			c == '/' || c == '.'
			) {
			result += c;
		}
		else 
		{
			int j = (short)c;
			if (j < 0) {
				j += 256;
			}
			int m, n;
			m = j / 16;
			n = j - m * 16;
			result += '%';
			result += dec2hexChar(m);
			result += dec2hexChar(n);
		}
	}
	return result;
}
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Url解码接口

QString urlDecode(const QString &url)
{
	QString result;
	string _url = url.toStdString();
	for (unsigned int i = 0; i < _url.size(); i++)
	{
		char c = _url[i];
		if ((c != '%') || (i >= _url.size()- 2))
		{
			result += c;
		}
		else 
		{
			char c1 = _url[i + 1];
			char c0 = _url[i + 2];
			if (-1 == hexChar2dec(c1) || -1 == hexChar2dec(c0)) 
			{
				result += c;
				continue;
			}
			int num = 0;
			num += hexChar2dec(c1) * 16 + hexChar2dec(c0);
			result += char(num);
			i += 2;
		}
	}
	return result;
}
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