// -*- C++ -*-// $Id: readers.h,v 1.12 2002/06/29 17:43:42 t1mpy Exp $// id3lib: a software 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_READERS_H_#define _ID3LIB_READERS_H_#include "id3/id3lib_streams.h"
#include "id3/reader.h"class ID3_CPP_EXPORT ID3_IStreamReader : public ID3_Reader{  istream& _stream; protected:  istream& getReader() const { return _stream; } public:  ID3_IStreamReader(istream& reader) : _stream(reader) { ; }  virtual ~ID3_IStreamReader() { ; }  virtual void close() { ; }    virtual int_type peekChar() { return _stream.peek(); }      /** Read up to \c len chars into buf and advance the internal position   ** accordingly.  Returns the number of characters read into buf.   **/  virtual size_type readChars(char buf[], size_type len)  {    return this->readChars(reinterpret_cast<uchar *>(buf), len);  }  virtual size_type readChars(char_type buf[], size_type len)  {    _stream.read((char *)buf, len);    return _stream.gcount();  }  virtual pos_type getBeg() { return 0; }  virtual pos_type getCur() { return _stream.tellg(); }  virtual pos_type getEnd()   {     pos_type cur = this->getCur();    _stream.seekg(0, ios::end);    pos_type end = this->getCur();    this->setCur(cur);    return end;  }      /** Set the value of the internal position for reading.   **/  virtual pos_type setCur(pos_type pos) { _stream.seekg(pos); return pos; }};  class ID3_CPP_EXPORT ID3_IFStreamReader : public ID3_IStreamReader{  ifstream& _file; public:  ID3_IFStreamReader(ifstream& reader)    : ID3_IStreamReader(reader), _file(reader) { ; }      virtual void close()   {     _file.close();  }};  class ID3_CPP_EXPORT ID3_MemoryReader : public ID3_Reader{  const char_type* _beg;  const char_type* _cur;  const char_type* _end; protected:  void setBuffer(const char_type* buf, size_type size)  {    _beg = buf;    _cur = buf;    _end = buf + size;  }; public:  ID3_MemoryReader()  {    this->setBuffer(NULL, 0);  }  ID3_MemoryReader(const char_type* buf, size_type size)  {    this->setBuffer(buf, size);  };  ID3_MemoryReader(const char* buf, size_type size)  {    this->setBuffer(reinterpret_cast<const char_type*>(buf), size);  };  virtual ~ID3_MemoryReader() { ; }  virtual void close() { ; }      virtual int_type peekChar()   {     if (!this->atEnd())    {      return *_cur;     }    return END_OF_READER;  }      /** Read up to \c len chars into buf and advance the internal position   ** accordingly.  Returns the number of characters read into buf.   **/  virtual size_type readChars(char buf[], size_type len)  {    return this->readChars(reinterpret_cast<char_type *>(buf), len);  }  virtual size_type readChars(char_type buf[], size_type len);      virtual pos_type getCur()   {     return _cur - _beg;   }      virtual pos_type getBeg()  {    return _beg - _beg;  }      virtual pos_type getEnd()  {    return _end - _beg;  }      /** Set the value of the internal position for reading.   **/  virtual pos_type setCur(pos_type pos)  {    pos_type end = this->getEnd();    size_type size = (pos < end) ? pos : end;    _cur = _beg + size;    return this->getCur();  }};#endif /* _ID3LIB_READERS_H_ */