Dexter URL encoding code snippet

libencode.cpp

//https://github.com/twelvesec/dexter
//GNU General Public License v3.0
//@maldevel

//...

std::string libencode::url_encode(std::string uri) {
	std::string encoded;
	DWORD len = (DWORD)uri.length();
	char *tmp;
	HRESULT result;

	if ((tmp = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 1)) == NULL) {
		return "";
	}

	if ((result = UrlEscapeA(uri.c_str(), tmp, &len, URL_ESCAPE_SEGMENT_ONLY | URL_ESCAPE_PERCENT)) != S_OK && result != E_POINTER) {
		int error = GetLastError();
		HeapFree(GetProcessHeap(), 0, tmp);
		tmp = NULL;
		return "";
	}

	HeapFree(GetProcessHeap(), 0, tmp);
	tmp = NULL;

	if ((tmp = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len)) == NULL) {
		return "";
	}

	if ((result = UrlEscapeA(uri.c_str(), tmp, &len, URL_ESCAPE_SEGMENT_ONLY | URL_ESCAPE_PERCENT)) != S_OK && result != E_POINTER) {
		HeapFree(GetProcessHeap(), 0, tmp);
		tmp = NULL;
		return "";
	}

	tmp[len] = 0;
	encoded = std::string(tmp);
	HeapFree(GetProcessHeap(), 0, tmp);
	tmp = NULL;

	std::string tosearch = "+";
	std::string replace = "%2b";
	size_t pos = encoded.find(tosearch);
	while (pos != std::string::npos)
	{
		encoded.replace(pos, tosearch.size(), replace);
		pos = encoded.find(tosearch, pos + tosearch.size());
	}

	return encoded;
}