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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_Base64_h__
#define mozilla_Base64_h__

#include "nsString.h"

class nsIInputStream;

namespace mozilla {

MOZ_MUST_USE nsresult
Base64EncodeInputStream(nsIInputStream* aInputStream,
                        nsACString& aDest,
                        uint32_t aCount,
                        uint32_t aOffset = 0);
MOZ_MUST_USE nsresult
Base64EncodeInputStream(nsIInputStream* aInputStream,
                        nsAString& aDest,
                        uint32_t aCount,
                        uint32_t aOffset = 0);

MOZ_MUST_USE nsresult
Base64Encode(const char* aBinary, uint32_t aBinaryLen, char** aBase64);
MOZ_MUST_USE nsresult
Base64Encode(const nsACString& aBinary, nsACString& aBase64);
MOZ_MUST_USE nsresult
Base64Encode(const nsAString& aBinary, nsAString& aBase64);

MOZ_MUST_USE nsresult
Base64Decode(const char* aBase64, uint32_t aBase64Len, char** aBinary,
             uint32_t* aBinaryLen);
MOZ_MUST_USE nsresult
Base64Decode(const nsACString& aBase64, nsACString& aBinary);
MOZ_MUST_USE nsresult
Base64Decode(const nsAString& aBase64, nsAString& aBinary);

enum class Base64URLEncodePaddingPolicy {
  Include,
  Omit,
};

/**
 * Converts |aBinary| to an unpadded, Base64 URL-encoded string per RFC 4648.
 * Aims to encode the data in constant time. The caller retains ownership
 * of |aBinary|.
 */
MOZ_MUST_USE nsresult
Base64URLEncode(uint32_t aBinaryLen, const uint8_t* aBinary,
                Base64URLEncodePaddingPolicy aPaddingPolicy,
                nsACString& aBase64);

enum class Base64URLDecodePaddingPolicy {
  Require,
  Ignore,
  Reject,
};

/**
 * Decodes a Base64 URL-encoded |aBase64| into |aBinary|.
 */
MOZ_MUST_USE nsresult
Base64URLDecode(const nsACString& aBase64,
                Base64URLDecodePaddingPolicy aPaddingPolicy,
                FallibleTArray<uint8_t>& aBinary);

} // namespace mozilla

#endif