field.h

FreeAMP(MP3播放)程序源代码-用来研究MP3解码

// -*- C++ -*-
// $Id: field.h,v 1.1 2001/01/12 00:41:08 robert Exp $

// id3lib: a C++ library for creating and manipulating id3v1/v2 tags
// Copyright 1999, 2000  Scott Thomas Haug

// 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_FIELD_H_
#define _ID3LIB_FIELD_H_

#include "globals.h"

class ID3_Reader;
class ID3_Writer;

class ID3_Field
{
public:
  virtual void Clear() = 0;

  virtual size_t Size() const = 0;
  virtual size_t BinSize() const = 0;
  virtual size_t GetNumTextItems() const = 0;

  // integer field functions
  virtual ID3_Field&    operator= (uint32 val) = 0;
  virtual void          Set(uint32) = 0;
  virtual uint32        Get() const = 0;

  // ASCII string field functions
  virtual ID3_Field&    operator= (const char* s) = 0;
  virtual size_t        Set(const char*) = 0;
  virtual size_t        Get(char*, size_t) const = 0;
  virtual size_t        Get(char*, size_t, index_t) const = 0;
  virtual const char*   GetRawText() const = 0;
  virtual const char*   GetRawTextItem(index_t) const = 0;
  virtual size_t        Add(const char*) = 0;

  // Unicode string field functions
  virtual ID3_Field&    operator= (const unicode_t* s) = 0;
  virtual size_t        Set(const unicode_t*) = 0;
  virtual size_t        Get(unicode_t *buffer, size_t) const = 0;
  virtual size_t        Get(unicode_t *buffer, size_t, index_t) const = 0;
  virtual const unicode_t* GetRawUnicodeText() const = 0;
  virtual const unicode_t* GetRawUnicodeTextItem(index_t) const = 0;
  virtual size_t        Add(const unicode_t*) = 0;

  // binary field functions
  virtual size_t        Set(const uchar*, size_t) = 0;
  virtual size_t        Get(uchar*, size_t) const = 0;
  virtual const uchar*  GetRawBinary() const = 0;
  virtual void          FromFile(const char*) = 0;
  virtual void          ToFile(const char *sInfo) const = 0;
  
  // miscelaneous functions
  virtual ID3_Field&    operator=( const ID3_Field & ) = 0;
  virtual bool          InScope(ID3_V2Spec spec) const = 0;

  virtual ID3_FieldID   GetID() const = 0;
  virtual ID3_FieldType GetType() const = 0;
  virtual bool          SetEncoding(ID3_TextEnc enc) = 0;
  virtual ID3_TextEnc   GetEncoding() const = 0;
  virtual bool          IsEncodable() const = 0;

  virtual void          Render(ID3_Writer&) const = 0;
  virtual bool          Parse(ID3_Reader&) = 0;
  virtual bool          HasChanged() const = 0;

protected:
  virtual ~ID3_Field() { };

  // To prevent public instantiation, the constructor is made protected
  ID3_Field() { };
};

#endif /* _ID3LIB_FIELD_H_ */