code:Работа с буфером, загруженным по сети(final)

laba01upd3.cpp

@@ -1,10 +1,10 @@
 #include <iostream>
 #include <vector>
+#include <sstream>
+#include <string>
 #include "histogram.h"
 #include "svg.h"
 #include "text.h"
-#include <string>
-
 #include <curl/curl.h>
 
 using namespace std;
@@ -13,54 +13,58 @@ struct Input {
     vector<double> numbers;
     size_t bin_count{};
 };
+
 Input input_data(istream& in, bool prompt) {
     if (prompt) cerr << "Enter number count: ";
     size_t number_count;
     in >> number_count;
-
     Input data;
     data.numbers.resize(number_count);
     if (prompt) cerr << "Enter " << number_count << " numbers: ";
     for (size_t i = 0; i < number_count; i++) {
         in >> data.numbers[i];
     }
-
     if (prompt) cerr << "Enter bin count: ";
     in >> data.bin_count;
-
     return data;
 }
 
+static size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
+    size_t data_size = item_size * item_count;
+    auto* 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();
+    
+    curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+    CURLcode res = curl_easy_perform(curl);
+    if (res != CURLE_OK) {
+        cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << "\n";
+        curl_easy_cleanup(curl);
+        exit(1);
+    }
+    curl_easy_cleanup(curl);
+    return input_data(buffer, false);
+}
 
 int main(int argc, char* argv[]) {
     curl_global_init(CURL_GLOBAL_ALL);
-
+    Input in;
     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 != CURLE_OK) {
-                cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << endl;
-                curl_easy_cleanup(curl);
-                curl_global_cleanup();
-                exit(1); 
-            }
-
-            curl_easy_cleanup(curl);
-        }
-        curl_global_cleanup(); 
-        return 0;
+        in = download(argv[1]);
     }
-
-    auto in = input_data(cin, true);
-    auto bins = make_histogram(in.numbers, in.bin_count);
+    else {
+        in = input_data(cin, true);
+    }
+    const auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     show_histogram_text(bins);
-
-   
+    curl_global_cleanup();
     return 0;
 }