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

/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* 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 BOX_H_

#define BOX_H_

#include <stdint.h>

#include "nsTArray.h"

#include "MediaResource.h"

#include "mozilla/EndianUtils.h"

#include "AtomType.h"

#include "BufferReader.h"

namespace mozilla {

class ByteStream;

class BoxContext

{

public:

  BoxContext(ByteStream* aSource, const MediaByteRangeSet& aByteRanges)

    : mSource(aSource), mByteRanges(aByteRanges)

  {

  }

  RefPtr<ByteStream> mSource;

  const MediaByteRangeSet& mByteRanges;

};

class Box

{

public:

  Box(BoxContext* aContext, uint64_t aOffset, const Box* aParent = nullptr);

  Box();

  bool IsAvailable() const { return !mRange.IsEmpty(); }

  uint64_t Offset() const { return mRange.mStart; }

  uint64_t Length() const { return mRange.mEnd - mRange.mStart; }

  uint64_t NextOffset() const { return mRange.mEnd; }

  const MediaByteRange& Range() const { return mRange; }

  const Box* Parent() const { return mParent; }

  bool IsType(const char* aType) const { return mType == AtomType(aType); }

  Box Next() const;

  Box FirstChild() const;

  nsTArray<uint8_t> Read() const;

  bool Read(nsTArray<uint8_t>* aDest, const MediaByteRange& aRange) const;

  static const uint64_t kMAX_BOX_READ;

  const nsTArray<uint8_t>& Header() const { return mHeader; }

private:

  bool Contains(MediaByteRange aRange) const;

  BoxContext* mContext;

  mozilla::MediaByteRange mRange;

  uint64_t mBodyOffset;

  uint64_t mChildOffset;

  AtomType mType;

  nsTArray<uint8_t> mHeader;

  const Box* mParent;

};

// BoxReader takes a copy of a box contents and serves through an AutoByteReader.

class MOZ_RAII BoxReader

{

public:

  explicit BoxReader(Box& aBox)

    : mBuffer(aBox.Read())

    , mReader(mBuffer.Elements(), mBuffer.Length())

  {

  }

  BufferReader* operator->() { return &mReader; }

private:

  nsTArray<uint8_t> mBuffer;

  BufferReader mReader;

};

}

#endif