работа с буфером

main.cpp

@@ -5,6 +5,8 @@
 #include "text.h"
 #include "svg.h"
 #include <curl/curl.h>
+#include <sstream>
+#include <string>
 
 
 using namespace std;
@@ -16,6 +18,14 @@ struct Input
     size_t number_count;
 };
 
+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
 input_data(istream& in, bool promt)
 {
@@ -41,29 +51,43 @@ input_data(istream& in, bool promt)
     return ik;
 }
 
-int main(int argc, char* argv[])
+
+Input
+download(const string& address)
 {
-    if (argc > 1) {
-        CURL* curl = curl_easy_init();
-        if(curl) {
-            CURLcode res;
-            curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
-            res = curl_easy_perform(curl);
-            if (res != 0)
-            {
-                cout << curl_easy_strerror(res);
-                exit(1);
-            }
-            curl_easy_cleanup(curl);
+    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_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        res = curl_easy_perform(curl);
+        if (res != 0)
+        {
+            cout << curl_easy_strerror(res);
+            exit(1);
         }
 
-    return 0;
+        curl_easy_cleanup(curl);
+    }
+    return input_data(buffer, false);
+}
+
+int main(int argc, char* argv[])
+{
+    Input in;
+    if (argc > 1)
+    {
+        in = download(argv[1]);
+    }
+    else
+    {
+        in = input_data(cin, true);
     }
 
-    curl_global_init(CURL_GLOBAL_ALL);
-
     size_t number_count;
-    auto in = input_data(cin,true);
     auto B = make_histogram(in.numbers, in.kol_kor);
     show_histogram_svg(B, in.number_count);