media/base/encryption_scheme.cc

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/base/encryption_scheme.h"

#include <ostream>

#include "base/logging.h"

namespace media {

EncryptionScheme::EncryptionScheme() = default;

EncryptionScheme::EncryptionScheme(CipherMode mode,
                                   const EncryptionPattern& pattern)
    : mode_(mode), pattern_(pattern) {}

EncryptionScheme::~EncryptionScheme() = default;

bool EncryptionScheme::is_encrypted() const {
  return mode_ != CIPHER_MODE_UNENCRYPTED;
}

EncryptionScheme::CipherMode EncryptionScheme::mode() const {
  return mode_;
}

const EncryptionPattern& EncryptionScheme::pattern() const {
  return pattern_;
}

bool EncryptionScheme::Matches(const EncryptionScheme& other) const {
  return mode_ == other.mode_ && pattern_ == other.pattern_;
}

std::ostream& operator<<(std::ostream& os,
                         const EncryptionScheme& encryption_scheme) {
  if (!encryption_scheme.is_encrypted())
    return os << "Unencrypted";

  if (encryption_scheme.mode() == EncryptionScheme::CIPHER_MODE_AES_CTR)
    return os << "CENC";

  if (encryption_scheme.mode() == EncryptionScheme::CIPHER_MODE_AES_CBC) {
    return os << "CBCS with pattern ("
              << encryption_scheme.pattern().crypt_byte_block() << ","
              << encryption_scheme.pattern().skip_byte_block() << ")";
  }

  NOTREACHED();
  return os << "Unknown EncryptionScheme, mode = " << encryption_scheme.mode();
}

}  // namespace media