First init.

libraries/mcu-renderer/tools/fontconv/utils.cpp

@@ -0,0 +1,99 @@
+/*
+ * MCU renderer fontconv
+ * Utilities
+ *
+ * (C) 2023 Gissio
+ *
+ * License: MIT
+ */
+
+#include <stdexcept>
+#include <string>
+
+using namespace std;
+
+#include "utils.h"
+
+string to_lower(string str)
+{
+    for (auto &c : str)
+        c = tolower(c);
+
+    return str;
+}
+
+string to_upper(string str)
+{
+    for (auto &c : str)
+        c = toupper(c);
+
+    return str;
+}
+
+vector<string> split(string &str, char c)
+{
+    size_t start = 0;
+    size_t end;
+    vector<string> tokens;
+
+    while ((end = str.find(c, start)) != string::npos)
+    {
+        tokens.push_back(str.substr(start, end - start));
+
+        start = end + 1;
+    }
+
+    tokens.push_back(str.substr(start));
+
+    return tokens;
+}
+
+static int convertValue(string &str)
+{
+    if (str.starts_with("0x"))
+        return stoi(str, NULL, 16);
+    else
+        return stoi(str);
+}
+
+set<Charcode> parseCharcodes(string &charcodes)
+{
+    set<Charcode> charcodeSet;
+
+    vector<string> items = split(charcodes, ',');
+
+    if (charcodes != "")
+    {
+        for (auto &item : items)
+        {
+            vector<string> rangeElements = split(item, '-');
+
+            if (rangeElements.size() == 1)
+            {
+                Charcode value = convertValue(rangeElements[0]);
+
+                if (value >= 0 && value <= UINT16_MAX)
+                    charcodeSet.insert(value);
+                else
+                    throw runtime_error("invalid value");
+            }
+            else if (rangeElements.size() == 2)
+            {
+                Charcode from = convertValue(rangeElements[0]);
+                Charcode to = convertValue(rangeElements[1]);
+
+                if ((from >= 0) && (to >= 0) && (from <= to))
+                {
+                    for (Charcode value = from; value <= to; value++)
+                        charcodeSet.insert(value);
+                }
+                else
+                    throw runtime_error("invalid range values");
+            }
+            else
+                throw runtime_error("invalid range");
+        }
+    }
+
+    return charcodeSet;
+}