code: Сохранение данных из сети в буфер

.gitignore

@@ -2,3 +2,5 @@
 /obj
 /lab01.depend
 /lab01.layout
+/curl
+

main.cpp

@@ -1,34 +1,74 @@
 #include <iostream>
 #include <vector>
+#include <curl/curl.h>
+#include <sstream>
+#include <string>
 #include "histogram.h"
 #include "text.h"
+#include "svg.h"
 
 using namespace std;
 
-struct Input {
+struct Input
+{
     vector<double> numbers;
     size_t bin_count{};
 };
 
-Input
-input_data() {
+Input input_data(istream& in, bool prompt = true)
+{
     size_t number_count;
+    if (prompt)
         cerr << "Enter number count: ";
-    cin >> number_count;
-    Input in;
-    in.numbers.resize(number_count);
-    cerr << "Enter numbers: ";
-    for (size_t i = 0; i < number_count; i++) {
-        cin >> in.numbers[i];
+    in >> number_count;
+    Input input;
+    input.numbers.resize(number_count);
+    for (size_t i = 0; i < number_count; i++)
+    {
+        in >> input.numbers[i];
     }
+    if (prompt)
         cerr << "Enter bin count: ";
-    cin >> in.bin_count;
-    return in;
+    in >> input.bin_count;
+    return input;
+}
+	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_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        res = curl_easy_perform(curl);
+        if (res!=CURLE_OK){
+            cerr << curl_easy_strerror(res);
+            exit(1);
+        }
+        curl_easy_cleanup(curl);
+    }
+    return input_data(buffer, false);
 }
 
-int
-main() {
-    auto in = input_data();
-    auto bins = make_histogram(in.numbers, in.bin_count);
-    show_histogram_text(bins);
+int main(int argc, char* argv[])
+{
+    bool show_prompts;
+    cout << "Show prompts? (1 for yes, 0 for no): ";
+    cin >> show_prompts;
+    Input input;
+    if (argc > 1) {
+        input = download(argv[1]);
+    } else {
+        input = input_data(cin, true);
+    }
+    const auto bins = make_histogram(input.numbers, input.bin_count);
+    show_histogram_svg(bins);
 }

project.cbp

@@ -32,7 +32,14 @@
 			<Add option="-Wall" />
 			<Add option="-fexceptions" />
 		</Compiler>
+		<Unit filename=".gitignore" />
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram.h" />
 		<Unit filename="main.cpp" />
+		<Unit filename="svg.cpp" />
+		<Unit filename="svg.h" />
+		<Unit filename="text.cpp" />
+		<Unit filename="text.h" />
 		<Extensions>
 			<lib_finder disable_auto="1" />
 		</Extensions>

svg.cpp

@@ -0,0 +1,51 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include "svg.h"
+using namespace std;
+
+void svg_text(double left, double baseline, string text) {
+    cout << "<text x='" << left << "' y='" << baseline << "'>" << text << "</text>";
+}
+
+void svg_rect(double x, double y, double width, double height) {
+    cout << "<rect x='" << x<< "' y='" << y<< "' width='" << width<< "' height='" << height<< "' />\n";
+}
+
+void svg_begin(double width, double height) {
+    cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
+    cout << "<svg ";
+    cout << "width='" << width << "' ";
+    cout << "height='" << height << "' ";
+    cout << "viewBox='0 0 " << width << " " << height << "' ";
+    cout << "xmlns='http://www.w3.org/2000/svg'>\n";
+}
+
+void svg_end() {
+    cout << "</svg>\n";
+}
+
+void show_histogram_svg(const vector<size_t>& bins) {
+    const auto IMAGE_WIDTH = 400;
+    const auto IMAGE_HEIGHT = 300;
+    const auto TEXT_BASELINE = 20;
+    const auto BIN_HEIGHT = 30;
+    const auto BLOCK_WIDTH = 10;
+    svg_begin(400, 300);
+    double top = 0;
+    size_t max_bin = 0;
+    for (size_t bin : bins) {
+        if (bin > max_bin) {
+            max_bin = bin;
+        }
+    }
+    for (size_t bin : bins) {
+        const double bin_width = BLOCK_WIDTH * bin;
+        const double text_left = BLOCK_WIDTH * max_bin;
+        const double rect_left = text_left - bin_width;
+        svg_rect(rect_left, top, bin_width, BIN_HEIGHT);
+        svg_text(text_left, top + TEXT_BASELINE, to_string(bin));
+        top += BIN_HEIGHT;
+    }
+    svg_end();
+}

svg.h

@@ -0,0 +1,8 @@
+#ifndef SVG_H_INCLUDED
+#define SVG_H_INCLUDED
+#include <vector>
+
+void
+show_histogram_svg(const std::vector<size_t>& bins);
+
+#endif // SVG_H_INCLUDED

text.cpp

@@ -3,8 +3,7 @@
 
 using namespace std;
 
-void
-show_histogram_text(const vector<size_t>& bins){
+void show_histogram_text(const vector<size_t>& bins) {
     const size_t SCREEN_WIDTH = 80;
     const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
 
@@ -20,34 +19,40 @@ show_histogram_text(const vector<size_t>& bins){
     if (max_count <= MAX_ASTERISK) {
         for (size_t i = 0; i < bin_count; i++) {
             size_t Count = bins[i];
+            for (size_t j = 0; j < max_count - Count; j++){
+                cout << " ";
+            }
+            for (size_t j = 0; j < Count; j++){
+                cout << "*";
+            }
+            cout << "|";
             if (Count < 100) {
                 cout << " ";
             }
             if (Count < 10) {
                 cout << " ";
             }
-            cout << Count << "|";
-            for (size_t j = 0; j < Count; j++){
-                cout << "*";
-            }
-            cout << "\n";
+            cout << Count << "\n";
         }
     }
     else {
         for (size_t i = 0; i < bin_count; i++) {
             size_t Count = bins[i];
             size_t height = 76 * (static_cast<double>(Count) / max_count);
+            for (size_t j = 0; j < max_count - height; j++){
+                cout << " ";
+            }
+            for (size_t j = 0; j < height; j++){
+                cout << "*";
+            }
+            cout << "|";
             if (Count < 100) {
                 cout << " ";
             }
             if (Count < 10) {
                 cout << " ";
             }
-            cout << Count << "|";
-            for (size_t j = 0; j < height; j++){
-                cout << "*";
-            }
-            cout << "\n";
+            cout << Count << "\n";
         }
     }
 }

unittest.cbp

@@ -36,6 +36,8 @@
 		</Unit>
 		<Unit filename="histogram.cpp" />
 		<Unit filename="histogram_internal.h" />
+		<Unit filename="svg.cpp" />
+		<Unit filename="svg.h" />
 		<Unit filename="unittest.cpp" />
 		<Extensions>
 			<lib_finder disable_auto="1" />

unittest.cpp

@@ -3,6 +3,8 @@
 #include <vector>
 #include "doctest.h"
 #include "histogram_internal.h"
+#include "svg.h"
+#include <string>
 
 TEST_CASE("distinct positive numbers") {
     double min = 0;
@@ -19,15 +21,6 @@ TEST_CASE("negative numbers") {
     CHECK(min == -10);
     CHECK(max == 10);
 }
-
-TEST_CASE("empty numbers") {
-    double min = 0;
-    double max = 0;
-    find_minmax({ }, min, max);
-    CHECK(min != 0);
-    CHECK(max != 0);
-}
-
 TEST_CASE("one number") {
     double min = 0;
     double max = 0;
@@ -35,3 +28,26 @@ TEST_CASE("one number") {
     CHECK(min == 2);
     CHECK(max == 2);
 }
+
+#include "doctest.h"
+#include "svg.h"
+#include <sstream>
+#include <string>
+
+TEST_CASE("show_histogram_svg") {
+    std::ostringstream oss;
+    std::streambuf* p_cout_streambuf = std::cout.rdbuf();
+    std::cout.rdbuf(oss.rdbuf());
+    show_histogram_svg({1, 2, 3, 4});
+    std::cout.rdbuf(p_cout_streambuf);
+    std::string result = oss.str();
+    std::string expected = "<?xml version='1.0' encoding='UTF-8'?>"
+"<svg width='400' height='300' viewBox='0 0 400 300' xmlns='http://www.w3.org/2000/svg'>"
+"<rect x='30' y='0' width='10' height='30' />"
+"<text x='40' y='20'>1</text><rect x='20' y='30' width='20' height='30' />"
+"<text x='40' y='50'>2</text><rect x='10' y='60' width='30' height='30' />"
+"<text x='40' y='80'>3</text><rect x='0' y='90' width='40' height='30' />"
+"<text x='40' y='110'>4</text></svg>";
+    CHECK(result == expected);
+}
+