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// 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&);
}
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