Adds lib-string-utils

libraries/lib-string-utils/UrlEncode.cpp

@@ -0,0 +1,44 @@
+/*!********************************************************************
+
+ Audacity: A Digital Audio Editor
+
+ @file UrlEncode.cpp
+ @brief Define a function to perfom URL encoding of a string.
+
+ Dmitry Vedenko
+ **********************************************************************/
+
+#include "UrlEncode.h"
+
+namespace audacity
+{
+
+std::string UrlEncode (const std::string& url)
+{
+    std::string escaped;
+
+    for (char c : url)
+    {
+        if (('0' <= c && c <= '9') ||
+            ('A' <= c && c <= 'Z') ||
+            ('a' <= c && c <= 'z') ||
+            (c == '~' || c == '-' || c == '_' || c == '.')
+            )
+        {
+            escaped.push_back (c);
+        }
+        else
+        {
+            static const char symbolLookup[] = "0123456789ABCDEF";
+
+            escaped.push_back ('%');
+
+            escaped.push_back (symbolLookup[(c & 0xF0) >> 4]);
+            escaped.push_back (symbolLookup[(c & 0x0F) >> 0]);
+        }
+    }
+
+    return escaped;
+}
+
+}