strawberry-audio-player-windows-mac-linux/3rdparty/taglib/ape/apefooter.cpp

/***************************************************************************
    copyright            : (C) 2004 by Allan Sandfeld Jensen
                           (C) 2002 - 2008 by Scott Wheeler (id3v2header.cpp)
    email                : kde@carewolf.org
 ***************************************************************************/

/***************************************************************************
 *   This library is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Lesser General Public License version   *
 *   2.1 as published by the Free Software Foundation.                     *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful, but   *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the Free Software   *
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA         *
 *   02110-1301  USA                                                       *
 *                                                                         *
 *   Alternatively, this file is available under the Mozilla Public        *
 *   License Version 1.1.  You may obtain a copy of the License at         *
 *   http://www.mozilla.org/MPL/                                           *
 ***************************************************************************/

#include <iostream>
#include <bitset>

#include "tstring.h"
#include "tdebug.h"

#include "apefooter.h"

using namespace Strawberry_TagLib::TagLib;
using namespace APE;

class APE::Footer::FooterPrivate {
 public:
  FooterPrivate() : version(0),
                    footerPresent(true),
                    headerPresent(false),
                    isHeader(false),
                    itemCount(0),
                    tagSize(0) {}

  unsigned int version;

  bool footerPresent;
  bool headerPresent;

  bool isHeader;

  unsigned int itemCount;
  unsigned int tagSize;
};

////////////////////////////////////////////////////////////////////////////////
// static members
////////////////////////////////////////////////////////////////////////////////

unsigned int APE::Footer::size() {
  return 32;
}

ByteVector APE::Footer::fileIdentifier() {
  return ByteVector("APETAGEX");
}

////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////

APE::Footer::Footer() : d(new FooterPrivate()) {
}

APE::Footer::Footer(const ByteVector &data) : d(new FooterPrivate()) {
  parse(data);
}

APE::Footer::~Footer() {
  delete d;
}

unsigned int APE::Footer::version() const {
  return d->version;
}

bool APE::Footer::headerPresent() const {
  return d->headerPresent;
}

bool APE::Footer::footerPresent() const {
  return d->footerPresent;
}

bool APE::Footer::isHeader() const {
  return d->isHeader;
}

void APE::Footer::setHeaderPresent(bool b) const {
  d->headerPresent = b;
}

unsigned int APE::Footer::itemCount() const {
  return d->itemCount;
}

void APE::Footer::setItemCount(unsigned int s) {
  d->itemCount = s;
}

unsigned int APE::Footer::tagSize() const {
  return d->tagSize;
}

unsigned int APE::Footer::completeTagSize() const {
  if (d->headerPresent)
    return d->tagSize + size();
  else
    return d->tagSize;
}

void APE::Footer::setTagSize(unsigned int s) {
  d->tagSize = s;
}

void APE::Footer::setData(const ByteVector &data) {
  parse(data);
}

ByteVector APE::Footer::renderFooter() const {
  return render(false);
}

ByteVector APE::Footer::renderHeader() const {

  if (!d->headerPresent)
    return ByteVector();
  else
    return render(true);

}

////////////////////////////////////////////////////////////////////////////////
// protected members
////////////////////////////////////////////////////////////////////////////////

void APE::Footer::parse(const ByteVector &data) {

  if (data.size() < size())
    return;

  // The first eight bytes, data[0..7], are the File Identifier, "APETAGEX".

  // Read the version number

  d->version = data.toUInt32LE(8);

  // Read the tag size

  d->tagSize = data.toUInt32LE(12);

  // Read the item count

  d->itemCount = data.toUInt32LE(16);

  // Read the flags

  std::bitset<32> flags(TAGLIB_CONSTRUCT_BITSET(data.toUInt32LE(20)));

  d->headerPresent = flags[31];
  d->footerPresent = !flags[30];
  d->isHeader = flags[29];

}

ByteVector APE::Footer::render(bool isHeader) const {

  ByteVector v;

  // add the file identifier -- "APETAGEX"

  v.append(fileIdentifier());

  // add the version number -- we always render a 2.000 tag regardless of what
  // the tag originally was.

  v.append(ByteVector::fromUInt32LE(2000));

  // add the tag size

  v.append(ByteVector::fromUInt32LE(d->tagSize));

  // add the item count

  v.append(ByteVector::fromUInt32LE(d->itemCount));

  // render and add the flags

  std::bitset<32> flags;

  flags[31] = d->headerPresent;
  flags[30] = false;  // footer is always present
  flags[29] = isHeader;

  v.append(ByteVector::fromUInt32LE(flags.to_ulong()));

  // add the reserved 64bit

  v.append(ByteVector::fromUInt64BE(0));

  return v;

}