header_tag.h

更新mp3

// -*- C++ -*-
// $Id: header_tag.h,v 1.2 2002/07/31 13:20:49 t1mpy Exp $

// id3lib: a C++ library for creating and manipulating id3v1/v2 tags
// Copyright 1999, 2000  Scott Thomas Haug
// Copyright 2002  Thijmen Klok ([e-mail])

// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Library General Public License as published by
// the Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// 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 Library General Public
// License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with this library; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

// The id3lib authors encourage improvements and optimisations to be sent to
// the id3lib coordinator.  Please see the README file for details on where to
// send such submissions.  See the AUTHORS file for a list of people who have
// contributed to id3lib.  See the ChangeLog file for a list of changes to
// id3lib.  These files are distributed with id3lib at
// http://download.sourceforge.net/id3lib/

#ifndef _ID3LIB_HEADER_TAG_H_
#define _ID3LIB_HEADER_TAG_H_

#include "header.h"

class ID3_TagHeader : public ID3_Header
{
public:

  enum
  {
    HEADER_FLAG_UNSYNC       = 1 << 7,
    HEADER_FLAG_EXTENDED     = 1 << 6,
    HEADER_FLAG_EXPERIMENTAL = 1 << 5,
    HEADER_FLAG_FOOTER       = 1 << 4
  };

  enum
  {
    EXT_HEADER_FLAG_BIT1  = 1 << 7,
    EXT_HEADER_FLAG_BIT2  = 1 << 6,
    EXT_HEADER_FLAG_BIT3  = 1 << 5,
    EXT_HEADER_FLAG_BIT4  = 1 << 4
  };

  ID3_TagHeader() : ID3_Header() { ; }
  virtual ~ID3_TagHeader() { ; }
  ID3_TagHeader(const ID3_TagHeader& rhs) : ID3_Header() { *this = rhs; }

  bool   SetSpec(ID3_V2Spec);
  size_t Size() const;
  void Render(ID3_Writer&) const;
  bool Parse(ID3_Reader&);
  void ParseExtended(ID3_Reader&);
  ID3_TagHeader& operator=(const ID3_TagHeader&hdr)
  { this->ID3_Header::operator=(hdr); return *this; }

  bool SetUnsync(bool b)
  {
    bool changed = _flags.set(HEADER_FLAG_UNSYNC, b);
    _changed = _changed || changed;
    return changed;
  }
  bool GetUnsync() const { return _flags.test(HEADER_FLAG_UNSYNC); }
  bool SetExtended(bool b)
  {
    bool changed = _flags.set(HEADER_FLAG_EXTENDED, b);
    _changed = _changed || changed;
    return changed;
  }
  bool GetExtended() const { return _flags.test(HEADER_FLAG_EXTENDED); }
  bool SetExperimental(bool b)
  {
    bool changed = _flags.set(HEADER_FLAG_EXPERIMENTAL, b);
    _changed = _changed || changed;
    return changed;
  }
  bool GetExperimental() const { return _flags.test(HEADER_FLAG_EXPERIMENTAL); }
  bool SetFooter(bool b)
  {
    bool changed = _flags.set(HEADER_FLAG_FOOTER, b);
    _changed = _changed || changed;
    return changed;
  }
  bool GetFooter() const { return _flags.test(HEADER_FLAG_FOOTER); }

  // id3v2 tag header signature:  $49 44 33 MM mm GG ss ss ss ss
  // MM = major version (will never be 0xFF)
  // mm = minor version (will never be 0xFF)
  // ff = flags byte 
  // ss = size bytes (less than $80)
  static const char* const ID;
  enum
  {
    ID_SIZE        = 3,
    MAJOR_OFFSET   = 3,
    MINOR_OFFSET   = 4,
    FLAGS_OFFSET   = 5,
    SIZE_OFFSET    = 6,
    SIZE           = 10 // does not include extented headers
  };
  
};

#endif /* _ID3LIB_HEADER_TAG_H_ */