| // -*- 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 (int_type)_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 (pos_type)(_cur - _beg); |
| } |
| |
| virtual pos_type getBeg() |
| { |
| return (pos_type)(_beg - _beg); |
| } |
| |
| virtual pos_type getEnd() |
| { |
| return (pos_type)(_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_ */ |
| |