Implemented curl support for web requests

src/DefaultWebRequestCurl.cpp

-#include <AdblockPlus/WebRequest.h>
-
-AdblockPlus::WebRequest::~WebRequest()
-{
-}
-
-#if defined(HAVE_CURL)
-
 #include <sstream>
 #include <cctype>
 #include <algorithm>
 #include <curl/curl.h>
+#include <AdblockPlus/WebRequest.h>
 
 namespace
 {
   struct HeaderData
   {
     int status;
     bool expectingStatus;
     std::vector<std::string> headers;
 
     HeaderData()
     {
       status = 0;
       expectingStatus = true;
     }
   };
 
   unsigned int ConvertErrorCode(CURLcode code)
   {
     switch (code)
     {
       case CURLE_OK:
-        return NS_OK;
+        return AdblockPlus::WebRequest::NS_OK;
       case CURLE_FAILED_INIT:
-        return NS_ERROR_NOT_INITIALIZED;
+        return AdblockPlus::WebRequest::NS_ERROR_NOT_INITIALIZED;
       case CURLE_UNSUPPORTED_PROTOCOL:
-        return NS_ERROR_UNKNOWN_PROTOCOL;
+        return AdblockPlus::WebRequest::NS_ERROR_UNKNOWN_PROTOCOL;
       case CURLE_URL_MALFORMAT:
-        return NS_ERROR_MALFORMED_URI;
+        return AdblockPlus::WebRequest::NS_ERROR_MALFORMED_URI;
       case CURLE_COULDNT_RESOLVE_PROXY:
-        return NS_ERROR_UNKNOWN_PROXY_HOST;
+        return AdblockPlus::WebRequest::NS_ERROR_UNKNOWN_PROXY_HOST;
       case CURLE_COULDNT_RESOLVE_HOST:
-        return NS_ERROR_UNKNOWN_HOST;
+        return AdblockPlus::WebRequest::NS_ERROR_UNKNOWN_HOST;
       case CURLE_COULDNT_CONNECT:
-        return NS_ERROR_CONNECTION_REFUSED;
+        return AdblockPlus::WebRequest::NS_ERROR_CONNECTION_REFUSED;
       case CURLE_OUT_OF_MEMORY:
-        return NS_ERROR_OUT_OF_MEMORY;
+        return AdblockPlus::WebRequest::NS_ERROR_OUT_OF_MEMORY;
       case CURLE_OPERATION_TIMEDOUT:
-        return NS_ERROR_NET_TIMEOUT;
+        return AdblockPlus::WebRequest::NS_ERROR_NET_TIMEOUT;
       case CURLE_TOO_MANY_REDIRECTS:
-        return NS_ERROR_REDIRECT_LOOP;
+        return AdblockPlus::WebRequest::NS_ERROR_REDIRECT_LOOP;
       case CURLE_GOT_NOTHING:
-        return NS_ERROR_NO_CONTENT;
+        return AdblockPlus::WebRequest::NS_ERROR_NO_CONTENT;
       case CURLE_SEND_ERROR:
-        return NS_ERROR_NET_RESET;
+        return AdblockPlus::WebRequest::NS_ERROR_NET_RESET;
       case CURLE_RECV_ERROR:
-        return NS_ERROR_NET_RESET;
+        return AdblockPlus::WebRequest::NS_ERROR_NET_RESET;
       default:
-        return NS_CUSTOM_ERROR_BASE + code;
+        return AdblockPlus::WebRequest::NS_CUSTOM_ERROR_BASE + code;
     }
   }
 
   size_t ReceiveData(char* ptr, size_t size, size_t nmemb, void* userdata)
   {
     std::stringstream* stream = static_cast<std::stringstream*>(userdata);
     stream->write(ptr, size * nmemb);
     return nmemb;
   }
 
@@ skipping 57 matching lines @@
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, ReceiveData);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, &responseText);
     curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, ReceiveHeader);
     curl_easy_setopt(curl, CURLOPT_HEADERDATA, &headerData);
 
     struct curl_slist* headerList = 0;
     for (HeaderList::const_iterator it = requestHeaders.begin();
       it != requestHeaders.end(); ++it)
     {
-      curl_slist_append(headerList, (it->first + ": " + it->second).c_str());
+      headerList = curl_slist_append(headerList, (it->first + ": " + it->second).c_str());
     }
     if (headerList)
       curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerList);
 
     result.status = ConvertErrorCode(curl_easy_perform(curl));
     result.responseStatus = headerData.status;
     result.responseText = responseText.str();
     for (std::vector<std::string>::iterator it = headerData.headers.begin();
         it != headerData.headers.end(); ++it)
     {
@@ skipping 22 matching lines @@
         }
       }
     }
 
     if (headerList)
       curl_slist_free_all(headerList);
     curl_easy_cleanup(curl);
   }
   return result;
 }
-#else
-AdblockPlus::ServerResponse AdblockPlus::DefaultWebRequest::GET(
-    const std::string& url, const HeaderList& requestHeaders) const
-{
-  AdblockPlus::ServerResponse result;
-  result.status = NS_ERROR_FAILURE;
-  result.responseStatus = 0;
-  return result;
-}
-#endif