work with CURL

main_original.cpp

@@ -3,7 +3,7 @@
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
-
+#include <sstream>
 #include <curl/curl.h>
 
 
@@ -26,18 +26,43 @@ Input input_data(istream& stream) {
     return in;
 }
 
-int main(int argc, char* argv[]) {
-    if (argc > 1) {
-            CURL* curl = curl_easy_init();
-            auto res = curl_easy_perform(curl);
-            if (res != 0) {
-                cout << curl_easy_strerror(res);
-                exit(1);
-            }
-            curl_easy_cleanup(curl);
-            return 0;
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
+    size_t data_size = item_size * item_count;
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
+}
+
+
+Input download(const string& address) {
+    stringstream buffer;
+    CURL* curl = curl_easy_init();
+    if (curl) {
+        CURLcode res;
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        res = curl_easy_perform(curl);
+        if (res != CURLE_OK) {
+            cout << curl_easy_strerror(res);
+            exit(1);
+        }
+        auto data = curl_version_info(CURLVERSION_NOW)->protocols;
+            for (auto protocol = data; *protocol; ++protocol) {
+            cerr << *protocol << endl;
+        }        curl_easy_cleanup(curl);
+    }
+        return input_data(buffer);
+}
+
+int main(int argc, char* argv[]) {
+    Input in;
+    if (argc > 1) {
+        in = download(argv[1]);
+    } else {
+        in = input_data(cin);
     }
-    Input in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;