wininet: Work around NULL headers when handling HTTP_QUERY_RAW_HEADERS_CRLF.

dlls/wininet/http.c

@@ -2187,15 +2187,18 @@ static BOOL WINAPI HTTP_HttpQueryInfoW( LPWININETHTTPREQW lpwhr, DWORD dwInfoLev
     case HTTP_QUERY_RAW_HEADERS_CRLF:
         {
             LPWSTR headers;
-            DWORD len;
+            DWORD len = 0;
             BOOL ret = FALSE;
+            static const WCHAR CRLF[] = {'\r','\n',0};
 
             if (request_only)
                 headers = HTTP_BuildHeaderRequestString(lpwhr, lpwhr->lpszVerb, lpwhr->lpszPath, lpwhr->lpszVersion);
             else
                 headers = lpwhr->lpszRawHeaders;
 
-            len = strlenW(headers) * sizeof(WCHAR);
+            if (headers)
+                len = strlenW(headers) * sizeof(WCHAR);
+
             if (len + sizeof(WCHAR) > *lpdwBufferLength)
             {
                 len += sizeof(WCHAR);
@@ -2204,7 +2207,13 @@ static BOOL WINAPI HTTP_HttpQueryInfoW( LPWININETHTTPREQW lpwhr, DWORD dwInfoLev
             }
             else if (lpBuffer)
             {
-                memcpy(lpBuffer, headers, len + sizeof(WCHAR));
+                if (headers)
+                    memcpy(lpBuffer, headers, len + sizeof(WCHAR));
+                else
+                {
+                    len = strlenW(CRLF) * sizeof(WCHAR);
+                    memcpy(lpBuffer, CRLF, sizeof(CRLF));
+                }
                 TRACE("returning data: %s\n", debugstr_wn(lpBuffer, len / sizeof(WCHAR)));
                 ret = TRUE;
             }

dlls/wininet/tests/http.c

@@ -1208,6 +1208,16 @@ static void HttpHeaders_test(void)
 
     /* end of W version tests */
 
+    /* Without HTTP_QUERY_FLAG_REQUEST_HEADERS */
+    index = 0;
+    len = sizeof(buffer);
+    memset(buffer, 'x', sizeof(buffer));
+    ok(HttpQueryInfo(hRequest,HTTP_QUERY_RAW_HEADERS_CRLF,
+                buffer,&len,&index) == TRUE,"Query failed\n");
+    ok(len == 2, "Expected 2, got %d\n", len);
+    ok(strcmp(buffer, "\r\n") == 0, "Expected CRLF, got '%s'\n", buffer);
+    ok(index == 0, "Index was incremented\n");
+
     ok(HttpAddRequestHeaders(hRequest,"Warning:test2",-1,HTTP_ADDREQ_FLAG_ADD),
             "Failed to add duplicate header using HTTP_ADDREQ_FLAG_ADD\n");