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/* 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 "mozilla/Unused.h"
#include "SinfParser.h"
#include "AtomType.h"
#include "Box.h"
#include "ByteStream.h"

namespace mozilla {

Sinf::Sinf(Box& aBox)
  : mDefaultIVSize(0)
  , mDefaultEncryptionType()
{
  SinfParser parser(aBox);
  if (parser.GetSinf().IsValid()) {
    *this = parser.GetSinf();
  }
}

SinfParser::SinfParser(Box& aBox)
{
  for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
    if (box.IsType("schm")) {
      mozilla::Unused << ParseSchm(box);
    } else if (box.IsType("schi")) {
      mozilla::Unused << ParseSchi(box);
    }
  }
}

Result<Ok, nsresult>
SinfParser::ParseSchm(Box& aBox)
{
  BoxReader reader(aBox);

  if (reader->Remaining() < 8) {
    return Err(NS_ERROR_FAILURE);
  }

  MOZ_TRY(reader->ReadU32()); // flags -- ignore
  MOZ_TRY_VAR(mSinf.mDefaultEncryptionType, reader->ReadU32());
  return Ok();
}

Result<Ok, nsresult>
SinfParser::ParseSchi(Box& aBox)
{
  for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
    if (box.IsType("tenc") && ParseTenc(box).isErr()) {
      return Err(NS_ERROR_FAILURE);
    }
  }
  return Ok();
}

Result<Ok, nsresult>
SinfParser::ParseTenc(Box& aBox)
{
  BoxReader reader(aBox);

  if (reader->Remaining() < 24) {
    return Err(NS_ERROR_FAILURE);
  }

  MOZ_TRY(reader->ReadU32()); // flags -- ignore

  uint32_t isEncrypted;
  MOZ_TRY_VAR(isEncrypted, reader->ReadU24());
  MOZ_TRY_VAR(mSinf.mDefaultIVSize, reader->ReadU8());
  memcpy(mSinf.mDefaultKeyID, reader->Read(16), 16);
  return Ok();
}

}