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// $Id: frame_parse.cpp,v 1.34 2002/07/06 13:53:18 t1mpy 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/
#if defined HAVE_CONFIG_H
#include <config.h>
#endif
#include "frame_impl.h"
#include "id3/io_decorators.h" //has "readers.h" "io_helpers.h" "utils.h"
using namespace dami;
namespace
{
bool parseFields(ID3_Reader& rdr, ID3_FrameImpl& frame)
{
int iLoop;
int iFields;
io::ExitTrigger et(rdr);
ID3_TextEnc enc = ID3TE_ASCII; // set the default encoding
ID3_V2Spec spec = frame.GetSpec();
// parse the frame's fields
iFields = frame.NumFields();
ID3D_NOTICE( "ID3_FrameImpl::Parse(): num_fields = " << iFields );
iLoop = 0;
for (ID3_FrameImpl::iterator fi = frame.begin(); fi != frame.end(); ++fi)
{
ID3_Field* fp = *fi;
++iLoop;
if (rdr.atEnd())
{
// there's no remaining data to parse!
ID3D_WARNING( "ID3_FrameImpl::Parse(): out of data at postion " <<
rdr.getCur() );
if (iLoop == iFields)
{
//if we are at the last field, (the 'data' field) it's apparently
//an empty tag used for filling up padding, it's no problem
//break will set the current 'cursor' to the right spot outside the for loop
break;
}
return false;
}
if (NULL == fp)
{
// Ack! Why is the field NULL? Log this...
ID3D_WARNING( "ID3_FrameImpl::Parse(): field is null" );
continue;
}
if (!fp->InScope(spec))
{
ID3D_NOTICE( "ID3_FrameImpl::Parse(): field is not in scope" );
// continue with the rest of the fields
continue;
}
ID3D_NOTICE( "ID3_FrameImpl::Parse(): setting enc to " << enc );
fp->SetEncoding(enc);
ID3_Reader::pos_type beg = rdr.getCur();
et.setExitPos(beg);
ID3D_NOTICE( "ID3_FrameImpl::Parse(): parsing field, cur = " << beg );
ID3D_NOTICE( "ID3_FrameImpl::Parse(): parsing field, end = " <<
rdr.getEnd() );
if (!fp->Parse(rdr) || rdr.getCur() == beg)
{
// nothing to parse! ack! parse error...
ID3D_WARNING( "ID3_FrameImpl::Parse(): no data parsed, bad parse" );
return false;
}
if (fp->GetID() == ID3FN_TEXTENC)
{
enc = static_cast<ID3_TextEnc>(fp->Get());
ID3D_NOTICE( "ID3_FrameImpl::Parse(): found encoding = " << enc );
}
}
et.setExitPos(rdr.getCur());
return true;
}
};
bool ID3_FrameImpl::Parse(ID3_Reader& reader)
{
io::ExitTrigger et(reader);
ID3D_NOTICE( "ID3_FrameImpl::Parse(): reader.getBeg() = " << reader.getBeg() );
ID3D_NOTICE( "ID3_FrameImpl::Parse(): reader.getCur() = " << reader.getCur() );
ID3D_NOTICE( "ID3_FrameImpl::Parse(): reader.getEnd() = " << reader.getEnd() );
ID3_Reader::pos_type beg = reader.getCur();
if (!_hdr.Parse(reader) || reader.getCur() == beg)
{
ID3D_WARNING( "ID3_FrameImpl::Parse(): no header to parse" );
return false;
}
ID3D_NOTICE( "ID3_FrameImpl::Parse(): after hdr, getCur() = " << reader.getCur() );
ID3D_NOTICE( "ID3_FrameImpl::Parse(): found frame! id = " << _hdr.GetTextID() );
// data is the part of the frame buffer that appears after the header
const size_t dataSize = _hdr.GetDataSize();
ID3D_NOTICE( "ID3_FrameImpl::Parse(): dataSize = " << dataSize );
if (reader.getEnd() < beg + dataSize)
{
ID3D_WARNING( "ID3_FrameImpl::Parse(): not enough data to parse frame" );
return false;
}
io::WindowedReader wr(reader, dataSize);
ID3D_NOTICE( "ID3_FrameImpl::Parse(): window getBeg() = " << wr.getBeg() );
ID3D_NOTICE( "ID3_FrameImpl::Parse(): window getCur() = " << wr.getCur() );
ID3D_NOTICE( "ID3_FrameImpl::Parse(): window getEnd() = " << wr.getEnd() );
unsigned long origSize = 0;
if (_hdr.GetCompression())
{
origSize = io::readBENumber(reader, sizeof(uint32));
ID3D_NOTICE( "ID3_FrameImpl::Parse(): frame is compressed, origSize = " << origSize );
}
if (_hdr.GetEncryption())
{
char ch = wr.readChar();
this->SetEncryptionID(ch);
ID3D_NOTICE( "ID3_FrameImpl::Parse(): frame is encrypted, encryption_id = " << (int) ch );
}
if (_hdr.GetGrouping())
{
char ch = wr.readChar();
this->SetGroupingID(ch);
ID3D_NOTICE( "ID3_FrameImpl::Parse(): frame is encrypted, grouping_id = " << (int) ch );
}
// set the type of frame based on the parsed header
this->_ClearFields();
this->_InitFields();
bool success = false;
// expand out the data if it's compressed
if (!_hdr.GetCompression())
{
success = parseFields(wr, *this);
}
else
{
io::CompressedReader csr(wr, origSize);
success = parseFields(csr, *this);
}
et.setExitPos(wr.getCur());
_changed = false;
return true;
}
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