--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/decodeurl.cpp	Sat Jan 23 05:20:25 2021 -0500
@@ -0,0 +1,30 @@
+// requires libcurl
+#include <curl/curl.h>
+#include <iostream>
+#include <string.h>
+#include <fstream>
+
+int main(int argc, char * argv[]) {
+    if (argc != 3) {
+        std::cout << "usage: " << argv[0] << " <input> <output>";
+        return 0;
+    }
+    std::string encoded;
+    CURL * curl = curl_easy_init();
+    char somedata[256];
+    std::ifstream in (argv[1], std::ios:: in | std::ios::binary);
+    if (in) {
+        in .seekg(0, std::ios::end);
+        encoded.resize( in .tellg()); in .seekg(0, std::ios::beg); in .read( & encoded[0], encoded.size()); in .close();
+    }
+    int outlength;
+    char * cres = curl_easy_unescape(curl, encoded.c_str(), encoded.length(), & outlength);
+    std::string res(cres, cres + outlength);
+    curl_free(cres);
+    curl_easy_cleanup(curl);
+    std::ofstream myfile2;
+    myfile2.open(argv[2]);
+    myfile2 << res;
+    myfile2.close();
+    return 0;
+}