1 files changed, 64 insertions, 0 deletions
diff --git a/src/common/url_escape.cc b/src/common/url_escape.cc
new file mode 100644
index 000000000..6580d28c6
--- /dev/null
+++ b/src/common/url_escape.cc
@@ -0,0 +1,64 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "url_escape.h"
+
+#include <stdexcept>
+#include <sstream>
+
+std::string url_escape(const std::string& s)
+{
+  std::string out;
+  for (auto c : s) {
+    if (std::isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~' ||
+	c == '/') {
+      out.push_back(c);
+    } else {
+      char t[4];
+      snprintf(t, sizeof(t), "%%%02x", (int)(unsigned char)c);
+      out.append(t);
+    }
+  }
+  return out;
+}
+
+std::string url_unescape(const std::string& s)
+{
+  std::string out;
+  const char *end = s.c_str() + s.size();
+  for (const char *c = s.c_str(); c < end; ++c) {
+    switch (*c) {
+    case '%':
+      {
+	unsigned char v = 0;
+	for (unsigned i=0; i<2; ++i) {
+	  ++c;
+	  if (c >= end) {
+	    std::ostringstream ss;
+	    ss << "invalid escaped string at pos " << (c - s.c_str()) << " of '"
+	       << s << "'";
+	    throw std::runtime_error(ss.str());
+	  }
+	  v <<= 4;
+	  if (*c >= '0' && *c <= '9') {
+	    v += *c - '0';
+	  } else if (*c >= 'a' && *c <= 'f') {
+	    v += *c - 'a' + 10;
+	  } else if (*c >= 'A' && *c <= 'F') {
+	    v += *c - 'A' + 10;
+	  } else {
+	    std::ostringstream ss;
+	    ss << "invalid escaped string at pos " << (c - s.c_str()) << " of '"
+	       << s << "'";
+	    throw std::runtime_error(ss.str());
+	  }
+	}
+	out.push_back(v);
+      }
+      break;
+    default:
+      out.push_back(*c);
+    }
+  }
+  return out;
+}