3 files changed, 40 insertions, 1 deletions
diff --git a/libcommon/Makefile b/libcommon/Makefile
index d3d781d..ddff9fc 100644
--- a/libcommon/Makefile
+++ b/libcommon/Makefile
@@ -10,7 +10,8 @@ PROGSRC=\
     file.cpp \
     mime.cpp \
     stringutil.cpp \
-    tempfile.cpp
+    tempfile.cpp \
+    url.cpp
 
 SRC=$(PROGSRC)
 
diff --git a/libcommon/url.cpp b/libcommon/url.cpp
new file mode 100644
index 0000000..5baf603
--- /dev/null
+++ b/libcommon/url.cpp
@@ -0,0 +1,32 @@
+#include "url.h"
+
+std::string urlDecode(std::string s)
+{
+ std::string result;
+
+ size_t pos = 0;
+ while (pos < s.size()) {
+  char c {s[pos]};
+  if (c == '+') {
+   result += ' ';
+  } else if (c == '%' && pos + 2 < s.size()) {
+   try {
+    int i = stoi(s.substr(pos + 1, 2), 0, 16);
+    if (i < 0 || i > 255)
+     return result;
+
+    result += static_cast<char>(i);
+   } catch (...) {
+    return result;
+   }
+
+   pos += 2;
+  } else {
+   result += c;
+  }
+  pos++;
+ }
+
+ return result;
+}
+
diff --git a/libcommon/url.h b/libcommon/url.h
new file mode 100644
index 0000000..bd60616
--- /dev/null
+++ b/libcommon/url.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <string>
+
+std::string urlDecode(std::string s);
+