From 13ff1998e4003d109f4074bea42f78cb8de6ed91 Mon Sep 17 00:00:00 2001
From: Francois Kritzinger <francois@codesynthesis.com>
Date: Tue, 6 Feb 2024 10:52:18 +0200
Subject: Add base64url_encode()

---
 tests/base64/driver.cxx | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

(limited to 'tests')

diff --git a/tests/base64/driver.cxx b/tests/base64/driver.cxx
index a37a238..32d5236 100644
--- a/tests/base64/driver.cxx
+++ b/tests/base64/driver.cxx
@@ -13,6 +13,8 @@
 using namespace std;
 using namespace butl;
 
+// Test base64 encoding and decoding.
+//
 static bool
 encode (const string& i, const string& o)
 {
@@ -68,9 +70,44 @@ encode (const string& i, const string& o)
   return r;
 }
 
+// Test base64url encoding only (decoding not yet implemented).
+//
+static bool
+encode_url (const string& i, const string& o)
+{
+  istringstream is (i);
+  string s (base64url_encode (is));
+  bool r (s == o && is.eof ());
+
+  if (r)
+  {
+    is.seekg (0);
+
+    // VC15 seekg() doesn't clear eofbit.
+    //
+#if defined(_MSC_VER) && _MSC_VER < 1920
+    is.clear ();
+#endif
+
+    assert (!is.eof ());
+
+    ostringstream os;
+    base64url_encode (os, is);
+    r = os.str () == o && is.eof ();
+  }
+
+  if (r)
+    r = base64url_encode (vector<char> (i.begin (), i.end ())) == o;
+
+  return r;
+}
+
+
 int
 main ()
 {
+  // base64
+  //
   assert (encode ("", ""));
   assert (encode ("B", "Qg=="));
   assert (encode ("BX", "Qlg="));
@@ -80,6 +117,19 @@ main ()
   assert (encode ("BXzS@#", "Qlh6U0Aj"));
   assert (encode ("BXzS@#/", "Qlh6U0AjLw=="));
 
+  // base64url: no padding in output.
+  //
+  assert (encode_url ("", ""));
+  assert (encode_url ("B", "Qg"));
+  assert (encode_url ("BX", "Qlg"));
+  assert (encode_url ("BXz", "Qlh6"));
+  assert (encode_url ("BXzS", "Qlh6Uw"));
+  assert (encode_url ("BXzS@", "Qlh6U0A"));
+  assert (encode_url ("BXzS@#", "Qlh6U0Aj"));
+  assert (encode_url ("BXzS@#/", "Qlh6U0AjLw"));
+
+  // Multi-line input.
+  //
   const char* s (
 "class fdstream_base\n"
 "{\n"
@@ -91,10 +141,29 @@ main ()
 "  fdbuf buf_;\n"
 "};\n");
 
+  // base64
+  //
   const char* r (
 "Y2xhc3MgZmRzdHJlYW1fYmFzZQp7CnByb3RlY3RlZDoKICBmZHN0cmVhbV9iYXNlICgpID0gZGVm\n"
 "YXVsdDsKICBmZHN0cmVhbV9iYXNlIChpbnQgZmQpOiBidWZfIChmZCkge30KCnByb3RlY3RlZDoK\n"
 "ICBmZGJ1ZiBidWZfOwp9Owo=");
 
   assert (encode (s, r));
+
+  // base64url: no newlines or padding in output.
+  //
+  r =
+"Y2xhc3MgZmRzdHJlYW1fYmFzZQp7CnByb3RlY3RlZDoKICBmZHN0cmVhbV9iYXNlICgpID0gZGVm"
+"YXVsdDsKICBmZHN0cmVhbV9iYXNlIChpbnQgZmQpOiBidWZfIChmZCkge30KCnByb3RlY3RlZDoK"
+"ICBmZGJ1ZiBidWZfOwp9Owo";
+
+  assert (encode_url (s, r));
+
+  // Test 63rd and 64th characters: `>` maps to `+` or `-`; `?` maps to `/` or
+  // `_`.
+  //
+  assert (encode     (">>>>>>", "Pj4+Pj4+"));
+  assert (encode_url (">>>>>>", "Pj4-Pj4-"));
+  assert (encode     ("??????", "Pz8/Pz8/"));
+  assert (encode_url ("??????", "Pz8_Pz8_"));
 }
-- 
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