tag_find.cpp

FreeAMP(MP3播放)程序源代码-用来研究MP3解码

// $Id: tag_find.cpp,v 1.2 2001/01/16 21:08:01 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/

#include "id3config.h"
#include <string.h>

#include "tag_impl.h"
#include "field.h"
#include "utils.h"

using namespace dami;

ID3_TagImpl::const_iterator ID3_TagImpl::Find(const ID3_Frame *frame) const
{
  const_iterator cur = _frames.begin();
  
  for (; cur != _frames.end(); ++cur)
  {
    if (*cur == frame)
    {
      break;
    }
  }
  
  return cur;
}

ID3_TagImpl::iterator ID3_TagImpl::Find(const ID3_Frame *frame)
{
  iterator cur = _frames.begin();
  
  for (; cur != _frames.end(); ++cur)
  {
    if (*cur == frame)
    {
      break;
    }
  }
  
  return cur;
}

ID3_Frame *ID3_TagImpl::Find(ID3_FrameID id) const
{
  ID3_Frame *frame = NULL;
  
  // reset the cursor if it isn't set
  if (_frames.end() == _cursor)
  {
    _cursor = _frames.begin();
  }


  for (int iCount = 0; iCount < 2 && frame == NULL; iCount++)
  {
    // We want to cycle through the list to find the matching frame.  We
    // should begin from the cursor, search each successive frame, wrapping
    // if necessary.  The enclosing loop and the assignment statments below
    // ensure that we first begin at the cursor and search to the end of the
    // list and, if unsuccessful, start from the beginning of the list and
    // search to the cursor.
    const_iterator
      begin  = (0 == iCount ? _cursor       : _frames.begin()), 
      end    = (0 == iCount ? _frames.end() : _cursor);
    // search from the cursor to the end
    for (const_iterator cur = begin; cur != end; ++cur)
    {
      if ((*cur != NULL) && ((*cur)->GetID() == id))
      {
        // We've found a valid frame.  Set the cursor to be the next element
        frame = *cur;
        _cursor = ++cur;
        break;
      }
    }
  }
  
  return frame;
}

ID3_Frame *ID3_TagImpl::Find(ID3_FrameID id, ID3_FieldID fldID, String data) const
{
  ID3_Frame *frame = NULL;
  ID3D_NOTICE( "Find: looking for comment with data = " << data.c_str() );
  
  // reset the cursor if it isn't set
  if (_frames.end() == _cursor)
  {
    _cursor = _frames.begin();
    ID3D_NOTICE( "Find: resetting cursor" );
  }

  for (int iCount = 0; iCount < 2 && frame == NULL; iCount++)
  {
    ID3D_NOTICE( "Find: iCount = " << iCount );
    // We want to cycle through the list to find the matching frame.  We
    // should begin from the cursor, search each successive frame, wrapping
    // if necessary.  The enclosing loop and the assignment statments below
    // ensure that we first begin at the cursor and search to the end of the
    // list and, if unsuccessful, start from the beginning of the list and
    // search to the cursor.
    const_iterator
      begin  = (0 == iCount ? _cursor       : _frames.begin()), 
      end    = (0 == iCount ? _frames.end() : _cursor);
    // search from the cursor to the end
    for (const_iterator cur = begin; cur != end; ++cur)
    {
      ID3D_NOTICE( "Find: frame = 0x" << hex << (uint32) *cur << dec );
      if ((*cur != NULL) && ((*cur)->GetID() == id) &&
          (*cur)->Contains(fldID))
      {
        ID3_Field* fld = (*cur)->GetField(fldID);
        if (NULL == fld)
        {
          continue;
          ID3D_NOTICE( "Find: didn't have the right field" );
        }

        String text(fld->GetRawText(), fld->Size());
        ID3D_NOTICE( "Find: text = " << text.c_str() );

        if (text == data)
        {
          // We've found a valid frame.  Set cursor to be the next element
          frame = *cur;
          _cursor = ++cur;
          break;
        }
      }
    }
  }
  
  return frame;
}

ID3_Frame *ID3_TagImpl::Find(ID3_FrameID id, ID3_FieldID fldID, WString data) const
{
  ID3_Frame *frame = NULL;
  
  // reset the cursor if it isn't set
  if (_frames.end() == _cursor)
  {
    _cursor = _frames.begin();
  }

  for (int iCount = 0; iCount < 2 && frame == NULL; iCount++)
  {
    // We want to cycle through the list to find the matching frame.  We
    // should begin from the cursor, search each successive frame, wrapping
    // if necessary.  The enclosing loop and the assignment statments below
    // ensure that we first begin at the cursor and search to the end of the
    // list and, if unsuccessful, start from the beginning of the list and
    // search to the cursor.
    const_iterator
      begin  = (0 == iCount ? _cursor       : _frames.begin()), 
      end    = (0 == iCount ? _frames.end() : _cursor);
    // search from the cursor to the end
    for (const_iterator cur = begin; cur != end; ++cur)
    {
      if ((*cur != NULL) && ((*cur)->GetID() == id) &&
          (*cur)->Contains(fldID))
      {
        ID3_Field* fld = (*cur)->GetField(fldID);
        if (NULL == fld)
        {
          continue;
        }
        WString text = toWString(fld->GetRawUnicodeText(), fld->Size());

        if (text == data)
        {
          // We've found a valid frame.  Set cursor to be the next element
          frame = *cur;
          _cursor = ++cur;
          break;
        }
      }
    }
  }
  
  return frame;
}

ID3_Frame *ID3_TagImpl::Find(ID3_FrameID id, ID3_FieldID fldID, uint32 data) const
{
  ID3_Frame *frame = NULL;
  
  // reset the cursor if it isn't set
  if (_frames.end() == _cursor)
  {
    _cursor = _frames.begin();
  }

  for (int iCount = 0; iCount < 2 && frame == NULL; iCount++)
  {
    // We want to cycle through the list to find the matching frame.  We
    // should begin from the cursor, search each successive frame, wrapping
    // if necessary.  The enclosing loop and the assignment statments below
    // ensure that we first begin at the cursor and search to the end of the
    // list and, if unsuccessful, start from the beginning of the list and
    // search to the cursor.
    const_iterator
      begin  = (0 == iCount ? _cursor       : _frames.begin()), 
      end    = (0 == iCount ? _frames.end() : _cursor);
    // search from the cursor to the end
    for (const_iterator cur = begin; cur != end; ++cur)
    {
      if ((*cur != NULL) && ((*cur)->GetID() == id) &&
          ((*cur)->GetField(fldID)->Get() == data))
      {
        // We've found a valid frame.  Set the cursor to be the next element
        frame = *cur;
        _cursor = ++cur;
        break;
      }
    }
  }
  
  return frame;
}