/* -*- 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_dom_SRIMetadata_h

#define mozilla_dom_SRIMetadata_h

#include "nsTArray.h"

#include "nsString.h"

#include "SRICheck.h"

namespace mozilla {

namespace dom {

class SRIMetadata final

{

  friend class SRICheck;

public:

  static const uint32_t MAX_ALTERNATE_HASHES = 256;

  static const int8_t UNKNOWN_ALGORITHM = -1;

  /**

   * Create an empty metadata object.

   */

  SRIMetadata() : mAlgorithmType(UNKNOWN_ALGORITHM), mEmpty(true) {}

  /**

   * Split a string token into the components of an SRI metadata

   * attribute.

   */

  explicit SRIMetadata(const nsACString& aToken);

  /**

   * Returns true when this object's hash algorithm is weaker than the

   * other object's hash algorithm.

   */

  bool operator<(const SRIMetadata& aOther) const;

  /**

   * Not implemented. Should not be used.

   */

  bool operator>(const SRIMetadata& aOther) const;

  /**

   * Add another metadata's hash to this one.

   */

  SRIMetadata& operator+=(const SRIMetadata& aOther);

  /**

   * Returns true when the two metadata use the same hash algorithm.

   */

  bool operator==(const SRIMetadata& aOther) const;

  bool IsEmpty() const { return mEmpty; }

  bool IsMalformed() const { return mHashes.IsEmpty() || mAlgorithm.IsEmpty(); }

  bool IsAlgorithmSupported() const { return mAlgorithmType != UNKNOWN_ALGORITHM; }

  bool IsValid() const { return !IsMalformed() && IsAlgorithmSupported(); }

  uint32_t HashCount() const { return mHashes.Length(); }

  void GetHash(uint32_t aIndex, nsCString* outHash) const;

  void GetAlgorithm(nsCString* outAlg) const { *outAlg = mAlgorithm; }

  void GetHashType(int8_t* outType, uint32_t* outLength) const;

  const nsString& GetIntegrityString() const

  {

    return mIntegrityString;

  }

private:

  nsTArray<nsCString> mHashes;

  nsString mIntegrityString;

  nsCString mAlgorithm;

  int8_t mAlgorithmType;

  bool mEmpty;

};

} // namespace dom

} // namespace mozilla

#endif // mozilla_dom_SRIMetadata_h