gecko-dev/dom/media/gmp/GMPEncryptedBufferDataImpl.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "GMPEncryptedBufferDataImpl.h"
#include "mozilla/gmp/GMPTypes.h"

namespace mozilla {
namespace gmp {

GMPEncryptedBufferDataImpl::GMPEncryptedBufferDataImpl(const CryptoSample& aCrypto)
  : mKeyId(aCrypto.key)
  , mIV(aCrypto.iv)
  , mClearBytes(aCrypto.plain_sizes)
  , mCipherBytes(aCrypto.encrypted_sizes)
{
}

GMPEncryptedBufferDataImpl::GMPEncryptedBufferDataImpl(const GMPDecryptionData& aData)
{
  mKeyId = aData.mKeyId();
  mIV = aData.mIV();
  mClearBytes = aData.mClearBytes();
  mCipherBytes = aData.mCipherBytes();
  MOZ_ASSERT(mClearBytes.Length() == mCipherBytes.Length());
}

GMPEncryptedBufferDataImpl::~GMPEncryptedBufferDataImpl()
{
}

void
GMPEncryptedBufferDataImpl::RelinquishData(GMPDecryptionData& aData)
{
  aData.mKeyId() = Move(mKeyId);
  aData.mIV() = Move(mIV);
  aData.mClearBytes() = Move(mClearBytes);
  aData.mCipherBytes() = Move(mCipherBytes);
}

const uint8_t*
GMPEncryptedBufferDataImpl::KeyId() const
{
  return mKeyId.Elements();
}

uint32_t
GMPEncryptedBufferDataImpl::KeyIdSize() const
{
  return mKeyId.Length();
}

const uint8_t*
GMPEncryptedBufferDataImpl::IV() const
{
  return mIV.Elements();
}

uint32_t
GMPEncryptedBufferDataImpl::IVSize() const
{
  return mIV.Length();
}

const uint16_t*
GMPEncryptedBufferDataImpl::ClearBytes() const
{
  return mClearBytes.Elements();
}

const uint32_t*
GMPEncryptedBufferDataImpl::CipherBytes() const
{
  return mCipherBytes.Elements();
}

uint32_t
GMPEncryptedBufferDataImpl::NumSubsamples() const
{
  MOZ_ASSERT(mClearBytes.Length() == mCipherBytes.Length());
  // Return the min of the two, to ensure there's not chance of array index
  // out-of-bounds shenanigans.
  return std::min<uint32_t>(mClearBytes.Length(), mCipherBytes.Length());
}

} // namespace gmp
} // namespace mozilla