1 files changed, 65 insertions, 0 deletions
diff --git a/libbutl/base64.hxx b/libbutl/base64.hxx
new file mode 100644
index 0000000..a0d1450
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+++ b/libbutl/base64.hxx
@@ -0,0 +1,65 @@
+// file      : libbutl/base64.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#pragma once
+
+#include <iosfwd>
+#include <string>
+#include <vector>
+
+#include <libbutl/export.hxx>
+
+namespace butl
+{
+  // Base64-encode a stream or a buffer. Split the output into 76 char-long
+  // lines (new line is the 77th). If reading from a stream, check if it has
+  // badbit, failbit, or eofbit set and throw invalid_argument if that's the
+  // case. Otherwise, set eofbit on completion. If writing to a stream, check
+  // if it has badbit, failbit, or eofbit set and throw invalid_argument if
+  // that's the case. Otherwise set badbit if the write operation fails.
+  //
+  LIBBUTL_SYMEXPORT void
+  base64_encode (std::ostream&, std::istream&);
+
+  LIBBUTL_SYMEXPORT std::string
+  base64_encode (std::istream&);
+
+  LIBBUTL_SYMEXPORT std::string
+  base64_encode (const std::vector<char>&);
+
+  // Encode a stream or a buffer using base64url (RFC4648), a base64 variant
+  // with different 62nd and 63rd alphabet characters (- and _ instead of ~
+  // and .; to make it filesystem safe) and optional padding because the
+  // padding character `=` would have to be percent-encoded to be safe in
+  // URLs. This implementation does not output any padding, newlines or any
+  // other whitespace (which is required, for example, by RFC7519: JSON Web
+  // Token (JWT) and RFC7515: JSON Web Signature (JWS)).
+  //
+  // Note that base64url decoding has not yet been implemented.
+  //
+  LIBBUTL_SYMEXPORT void
+  base64url_encode (std::ostream&, std::istream&);
+
+  LIBBUTL_SYMEXPORT std::string
+  base64url_encode (std::istream&);
+
+  LIBBUTL_SYMEXPORT std::string
+  base64url_encode (const std::vector<char>&);
+
+  // Base64-decode a stream or a string. Throw invalid_argument if the input
+  // is not a valid base64 representation. If reading from a stream, check if
+  // it has badbit, failbit, or eofbit set and throw invalid_argument if
+  // that's the case. Otherwise, set eofbit on completion. If writing to a
+  // stream, check if it has badbit, failbit, or eofbit set and throw
+  // invalid_argument if that's the case. Otherwise set badbit if the write
+  // operation fails.
+  //
+  LIBBUTL_SYMEXPORT void
+  base64_decode (std::ostream&, std::istream&);
+
+  LIBBUTL_SYMEXPORT void
+  base64_decode (std::ostream&, const std::string&);
+
+  LIBBUTL_SYMEXPORT std::vector<char>
+  base64_decode (const std::string&);
+}